Rough idle and hard start solved... - Page 3

millco · 05-12-2008, 08:43 AM

What this wire is most likely causing is a fall in the 5 volt circuit. 5 volts is used by the computer to sense different measurements on the engine. When this circuit gets grounded and it's voltage goes down below 5 volts; all kinds of strange things can happen. In fact, you can't predict what will happen when you do this to a computer. Same thing can cause your computer at home to start doing all kinds of strange things.

Koonskinner,
I wouldn't think it was your grid heater. I haven't had a grid heater for a couple of months now. It hasn't affected it at all. If it only does it the first time you start it cold and it doesn't come and go intermitently; it probably isn't this wire. It could be a mechanical problem.

__________________
06 3500 4x4 SLT 48RE Mega sized, Plus 2 micron fuel filter, Twin Frantz oil filters, Rokk CPS, BHAF, ARE shell, Well, it's up to 14+ MPG

and of course there's a list of wants!
73 1210 2x4 Int'l - patiently waiting to become a Cummins! 76 Scout - looking for a 4BT!

koonskinner77 · 05-12-2008, 12:33 PM

Koonskinner,
I wouldn't think it was your grid heater. I haven't had a grid heater for a couple of months now. It hasn't affected it at all. If it only does it the first time you start it cold and it doesn't come and go intermitently; it probably isn't this wire. It could be a mechanical problem.[/quote]

Thanks for the response, I got under the truck this morning and wiggled the wires before firing it up. About 28 degrees here in OR this morning. Wait to start light came on. Once I turned it over it did exactly as you described, stumbled and sputtered then began to idle fine after a couple seconds. The grid heater then kicked in, I could tell by the volt meter. After a little bit the high idle kicked in and sounded right too. I'll keep an eye on it over the next few days and do a fix to cover the wires better. Thank God for this site or I would of been stumped.:thumbsup

Its been almost three weeks and the idle problem has not come back. I took some old fuel line and covered the wires to protect them. Definately was the problem. Thanks again guys.

__________________

2006 Megacab

Last edited by koonskinner77 : 05-30-2008 at 01:37 PM. Reason: Update

mybadford · 10-11-2008, 05:56 AM

My truck started to act up today. It sounds like it has a miss in it at an idle. You can only hear it through the exhaust. The engine doesn't shake at at. When I take off and the engine is under a little load it runs rough up to 1,200 rpms. Under a load on a hill and the turbo is spooled if you listen closely you can hear a little sputter in it. It doesn't seem to have any loss of power. I don't know if maybe I had bought some bad fuel. That is when I first noticed the noise in the exhaust. About five minutes before that I had the truck sideways on a hill with the drivers side down hill and low on fuel. The truck died and I started it back up and hooked up to a trailer and went to get fuel. I don't know if maybe I messed up an injector or injector pump or what. I do have a FASS pump on it and the pickup is to the passenger side of the tank. It almost sounds like I have a bent valve from the sound through the exhaust but I don't see how the truck would do that. ANY IDEAS???????????

__________________
2005 quad cab LB 6spd Edge/Smarty/5 inch Magnaflow/Fass150/150/Spearco intercooler/Industrial Injection phat shaft 62/ATS intake and exhaust manifold/+more http://www.youtube.com/watch?v=TEyU-...eature=channel http://www.youtube.com/watch?v=jVQ18_0HPg4

starlet910 · 10-13-2008, 04:29 PM

THis was a awsome find, I didnt even see the cut in the wire but my truck runs purfect now. There use to be a stall when it was cold (it's gone)

. I also had a downshifting problem. I realize it sounds like bull however I have had this problem where I go to pass someone, or even take off fast and it wont shift into the next gear, it's seemed as if it would come out of gear instead of going into the next gear when under a load(my foot). The wire fixed it though. Thanks again TITS

red1977 · 10-27-2008, 06:47 PM

wished this was my problem

__________________
GONE BUT NOT FORGOTTEN 2005 5.9 6speed. smarty tnt, s30064 turbo, ats intake, afe intake to turbo, stage 3 injectors, 150 fass, exhaust, guad boost fool er. south bend dd

keep truckin · 01-18-2009, 03:38 PM

Me too... found my wire to be bare, and I taped it up in a few different places. but it still has fluctuation in fuel pressure. Dealer couldn't find anything other than air getting in the fuel system somehow. Had me change out the transfer (lift) pump because he said that was the problem. So a brand new transfer pump and this wire being taped up and separated in corrugated plastic conduit, problem remains. I am told possible injection pump now. Not the kind of money I'm trying to GUESS with though...

Sheesh

__________________
2003 3500 CTD Dually 4x4. Auto. Crew cab, Black, Intake baffle and silencer ring MIA. 4" turbo back. Willy's Whistler 6" AMSOIL air filter. 2nd Gen Air Intake Horn in the garage, contemplating installing.

StoutCummins · 02-01-2009, 10:41 PM

Has this problem been found on all 3rd gens or just the 06 models???

__________________
'05 6-speed, Edge J/A, AFE, 5" MBRP, FS2500 oil system, sport+painted everything, BD intercooler, Wilson manifold.'02 6-speed, Edge j/a, AFE, 4" ATS, ATS arcflo, Aurora3000, Fass, 45 ATS sticks,SouthBend clutch.'05 Auto, Smarty, AFE, CFM, 5"Magnaflow.

keep truckin · 02-03-2009, 02:11 PM

Looks to be all of the models I think. Mine's an 03 and the wires were bare.

Hey check this out guys. So my truck's been in and out of the dealership twice for a week each time, and the mechanic can't figure it out. Like I said before, the transfer pump is pumping air into the fuel line causing foam, but I've replaced it twice with new parts. So I am still sold on the idea that the computer is telling it to do some crazy stuff down there (rapidly cycle?) and causing this condition.

As you can read before that I did find thise wires were bare and I taped them up which didn't fix the problem. However, last night after I pulled in to my yard and sat for a minute with all the lights off waiting for the song on the radio to finish before I shut off the truck, i noticed that when it was idling rough or surging, the AC light flashed once or twice very briefly. Keep in mind all my climate control was off. Isn't the wire in this thread talked about some sort or remote, or power supply to an item in the AC system? I thought that was kind of odd and will investigate it more later.

Just wanted to know what yall experts thought about that!?! A clue? Does this confirm these wires as my problem?

__________________
2003 3500 CTD Dually 4x4. Auto. Crew cab, Black, Intake baffle and silencer ring MIA. 4" turbo back. Willy's Whistler 6" AMSOIL air filter. 2nd Gen Air Intake Horn in the garage, contemplating installing.

Last edited by keep truckin : 02-03-2009 at 02:13 PM.

WISE GUY 7436 · 02-06-2009, 12:01 PM

I would like to know more about this issue.I have noticed the same thing in cold weather.Since I have removed the cat and muffler much more noticeable. Sometimes when I go to start truck when cold on occasion it will act like it lost fuel prime and if I try to start the truck again it will start right up. That is just one thing or one problem.The next is the missing and rough idle at high idle,it seems as though the truck is surging does not seem to be a problem when the truck is warm.I would like to know more about this and were this wire is located my truck is 2006 4 door short bed. I also so would like to know how to correct the over head display it reads sometime as far as 5 miles off of hand calculations example 25 =18/1/2 mpg also sometimes when I start the truck the over head will read minus 40 degrees it will eventually correct itself or if you restart the truck it will be fine.If any body can help it would be appreciated.I can be reached Via email at wiseguy7436@gmail.com any help would be appreciated thank you in advance
Thank you
Wise guy

__________________
Wise guy

Last edited by WISE GUY 7436 : 02-06-2009 at 04:12 PM.

WISE GUY 7436 · 02-06-2009, 04:10 PM

[quote=WISE GUY 7436;1266817] I would like to know about the issue about rough idle hard start bare wire issue.I have the same issue as well as others.Wont to work on this first though

__________________
Wise guy

aw2aggie · 02-06-2009, 08:22 PM

Quote:

Originally Posted by millco

Murry,
White smoke is too much fuel in a cold motor. Not good: keep an eye on your oil level. If it goes up at all, stop running your engine as it is getting fuel in the crankcase! You will have to try and notice what else goes with it or exactly when it does it. Like having to sit overnight, or if the temps have to fall to a certain point, or what ever. Or did I mis understand and it does it all the time?
What varies with your mileage or is it under the exact same conditions that it fluctuates so much?

I just got truck flashed at the stealership to cure the rough idle at start-up and white smoke. I changed the oil myself the same day adn after i got it back it seems that the oil pressure is higher... I just checked the oil level cold and it was high... probably gonna drain out a little, problem is now, when I checked the dip stick the oil was sooo black that I couldn't even read the dip stick... any ideas?

__________________
2004.5 2500 4X4 48RE QC LB PATRIOT BLUE, BFG A/T 285/70/R17, AEM HD workhorse CAI, what muffler

Bully Dog Torque Dog, Huskyliner front and back, Line-x

ah64id · 02-07-2009, 04:26 PM

Quote:

Originally Posted by aw2aggie

I just got truck flashed at the stealership to cure the rough idle at start-up and white smoke. I changed the oil myself the same day adn after i got it back it seems that the oil pressure is higher... I just checked the oil level cold and it was high... probably gonna drain out a little, problem is now, when I checked the dip stick the oil was sooo black that I couldn't even read the dip stick... any ideas?

Oil pressure reading is fake, so the flash may have changed it.

The oil in the 04.5+ trucks goes BLACK as soon as you change it. Just the nature of the beast.

__________________

05 3500 QC LB NV5600 4X4 SRW
Pricol's (EGT, Boost, DP, FP, Oil)
Amsoiled, BMK-11
GDP MK-2+ w/ Cat 2 mic
Smarty Jr Revo

10-13-2008, 04:29 PM	#28 (permalink)
starlet910 Newbie Join Date: Sep 2008 Location: Jaxsonville Posts: 3 Thanks: 0 Thanked 0 Times in 0 Posts starlet910's Truck Pics	THis was a awsome find, I didnt even see the cut in the wire but my truck runs purfect now. There use to be a stall when it was cold (it's gone). I also had a downshifting problem. I realize it sounds like bull however I have had this problem where I go to pass someone, or even take off fast and it wont shift into the next gear, it's seemed as if it would come out of gear instead of going into the next gear when under a load(my foot). The wire fixed it though. Thanks again TITS

02-06-2009, 12:01 PM	#33 (permalink)
WISE GUY 7436 Newbie Join Date: Feb 2009 Location: central PA Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts WISE GUY 7436's Truck Pics	rough idle and miss I would like to know more about this issue.I have noticed the same thing in cold weather.Since I have removed the cat and muffler much more noticeable. Sometimes when I go to start truck when cold on occasion it will act like it lost fuel prime and if I try to start the truck again it will start right up. That is just one thing or one problem.The next is the missing and rough idle at high idle,it seems as though the truck is surging does not seem to be a problem when the truck is warm.I would like to know more about this and were this wire is located my truck is 2006 4 door short bed. I also so would like to know how to correct the over head display it reads sometime as far as 5 miles off of hand calculations example 25 =18/1/2 mpg also sometimes when I start the truck the over head will read minus 40 degrees it will eventually correct itself or if you restart the truck it will be fine.If any body can help it would be appreciated.I can be reached Via email at wiseguy7436@gmail.com any help would be appreciated thank you in advance Thank you Wise guy __________________ Wise guy Last edited by WISE GUY 7436 : 02-06-2009 at 04:12 PM.

02-06-2009, 04:10 PM	#34 (permalink)
WISE GUY 7436 Newbie Join Date: Feb 2009 Location: central PA Posts: 2 Thanks: 0 Thanked 0 Times in 0 Posts WISE GUY 7436's Truck Pics	hard to start rough idle issue [quote=WISE GUY 7436;1266817] I would like to know about the issue about rough idle hard start bare wire issue.I have the same issue as well as others.Wont to work on this first though __________________ Wise guy

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

05-12-2008, 08:43 AM	#25 (permalink)
millco Cummins Nut Join Date: Mar 2006 Location: Idaho Posts: 347 Thanks: 0 Thanked 2 Times in 2 Posts millco's Truck Pics	What this wire is most likely causing is a fall in the 5 volt circuit. 5 volts is used by the computer to sense different measurements on the engine. When this circuit gets grounded and it's voltage goes down below 5 volts; all kinds of strange things can happen. In fact, you can't predict what will happen when you do this to a computer. Same thing can cause your computer at home to start doing all kinds of strange things. Koonskinner, I wouldn't think it was your grid heater. I haven't had a grid heater for a couple of months now. It hasn't affected it at all. If it only does it the first time you start it cold and it doesn't come and go intermitently; it probably isn't this wire. It could be a mechanical problem. __________________ 06 3500 4x4 SLT 48RE Mega sized, Plus 2 micron fuel filter, Twin Frantz oil filters, Rokk CPS, BHAF, ARE shell, Well, it's up to 14+ MPG and of course there's a list of wants! 73 1210 2x4 Int'l - patiently waiting to become a Cummins! 76 Scout - looking for a 4BT!

Remove Advertisements Sponsored Links
Dodge Cummins Diesel Forum Advertisement

05-12-2008, 12:33 PM	#26 (permalink)
koonskinner77 Newbie Join Date: Mar 2008 Location: Lakeview OR Posts: 29 Thanks: 0 Thanked 0 Times in 0 Posts koonskinner77's Truck Pics	Koonskinner, I wouldn't think it was your grid heater. I haven't had a grid heater for a couple of months now. It hasn't affected it at all. If it only does it the first time you start it cold and it doesn't come and go intermitently; it probably isn't this wire. It could be a mechanical problem.[/quote] Thanks for the response, I got under the truck this morning and wiggled the wires before firing it up. About 28 degrees here in OR this morning. Wait to start light came on. Once I turned it over it did exactly as you described, stumbled and sputtered then began to idle fine after a couple seconds. The grid heater then kicked in, I could tell by the volt meter. After a little bit the high idle kicked in and sounded right too. I'll keep an eye on it over the next few days and do a fix to cover the wires better. Thank God for this site or I would of been stumped.:thumbsup Its been almost three weeks and the idle problem has not come back. I took some old fuel line and covered the wires to protect them. Definately was the problem. Thanks again guys. __________________ 2006 Megacab Last edited by koonskinner77 : 05-30-2008 at 01:37 PM. Reason: Update

10-11-2008, 05:56 AM	#27 (permalink)
mybadford Cummins Fan Join Date: Dec 2007 Location: Missouri Posts: 62 Thanks: 0 Thanked 0 Times in 0 Posts mybadford's Truck Pics	My truck started to act up today. It sounds like it has a miss in it at an idle. You can only hear it through the exhaust. The engine doesn't shake at at. When I take off and the engine is under a little load it runs rough up to 1,200 rpms. Under a load on a hill and the turbo is spooled if you listen closely you can hear a little sputter in it. It doesn't seem to have any loss of power. I don't know if maybe I had bought some bad fuel. That is when I first noticed the noise in the exhaust. About five minutes before that I had the truck sideways on a hill with the drivers side down hill and low on fuel. The truck died and I started it back up and hooked up to a trailer and went to get fuel. I don't know if maybe I messed up an injector or injector pump or what. I do have a FASS pump on it and the pickup is to the passenger side of the tank. It almost sounds like I have a bent valve from the sound through the exhaust but I don't see how the truck would do that. ANY IDEAS??????????? __________________ 2005 quad cab LB 6spd Edge/Smarty/5 inch Magnaflow/Fass150/150/Spearco intercooler/Industrial Injection phat shaft 62/ATS intake and exhaust manifold/+more http://www.youtube.com/watch?v=TEyU-...eature=channel http://www.youtube.com/watch?v=jVQ18_0HPg4

10-27-2008, 06:47 PM	#29 (permalink)
red1977 Cummins Nut Join Date: Aug 2007 Location: ogden utah Posts: 374 Thanks: 0 Thanked 0 Times in 0 Posts red1977's Truck Pics	wished this was my problem __________________ GONE BUT NOT FORGOTTEN 2005 5.9 6speed. smarty tnt, s30064 turbo, ats intake, afe intake to turbo, stage 3 injectors, 150 fass, exhaust, guad boost fool er. south bend dd

01-18-2009, 03:38 PM	#30 (permalink)
keep truckin Cummins Fanatic Join Date: Dec 2007 Location: Fort Walton Beach, FL Posts: 134 Thanks: 0 Thanked 0 Times in 0 Posts keep truckin's Truck Pics	Me too... found my wire to be bare, and I taped it up in a few different places. but it still has fluctuation in fuel pressure. Dealer couldn't find anything other than air getting in the fuel system somehow. Had me change out the transfer (lift) pump because he said that was the problem. So a brand new transfer pump and this wire being taped up and separated in corrugated plastic conduit, problem remains. I am told possible injection pump now. Not the kind of money I'm trying to GUESS with though... Sheesh __________________ 2003 3500 CTD Dually 4x4. Auto. Crew cab, Black, Intake baffle and silencer ring MIA. 4" turbo back. Willy's Whistler 6" AMSOIL air filter. 2nd Gen Air Intake Horn in the garage, contemplating installing.

02-01-2009, 10:41 PM	#31 (permalink)
StoutCummins Cummins Fan Join Date: Nov 2008 Posts: 51 Thanks: 0 Thanked 0 Times in 0 Posts StoutCummins's Truck Pics	Has this problem been found on all 3rd gens or just the 06 models??? __________________ '05 6-speed, Edge J/A, AFE, 5" MBRP, FS2500 oil system, sport+painted everything, BD intercooler, Wilson manifold.'02 6-speed, Edge j/a, AFE, 4" ATS, ATS arcflo, Aurora3000, Fass, 45 ATS sticks,SouthBend clutch.'05 Auto, Smarty, AFE, CFM, 5"Magnaflow.

02-03-2009, 02:11 PM	#32 (permalink)
keep truckin Cummins Fanatic Join Date: Dec 2007 Location: Fort Walton Beach, FL Posts: 134 Thanks: 0 Thanked 0 Times in 0 Posts keep truckin's Truck Pics	Looks to be all of the models I think. Mine's an 03 and the wires were bare. Hey check this out guys. So my truck's been in and out of the dealership twice for a week each time, and the mechanic can't figure it out. Like I said before, the transfer pump is pumping air into the fuel line causing foam, but I've replaced it twice with new parts. So I am still sold on the idea that the computer is telling it to do some crazy stuff down there (rapidly cycle?) and causing this condition. As you can read before that I did find thise wires were bare and I taped them up which didn't fix the problem. However, last night after I pulled in to my yard and sat for a minute with all the lights off waiting for the song on the radio to finish before I shut off the truck, i noticed that when it was idling rough or surging, the AC light flashed once or twice very briefly. Keep in mind all my climate control was off. Isn't the wire in this thread talked about some sort or remote, or power supply to an item in the AC system? I thought that was kind of odd and will investigate it more later. Just wanted to know what yall experts thought about that!?! A clue? Does this confirm these wires as my problem? __________________ 2003 3500 CTD Dually 4x4. Auto. Crew cab, Black, Intake baffle and silencer ring MIA. 4" turbo back. Willy's Whistler 6" AMSOIL air filter. 2nd Gen Air Intake Horn in the garage, contemplating installing. Last edited by keep truckin : 02-03-2009 at 02:13 PM.