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Thread: Secondary Idle Adjustment? Reply to Thread
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  Topic Review (Newest First)
04-10-2019 11:10 AM
Millionmiles
Quote:
Originally Posted by myother4x4isaCJ7 View Post
Quote:
Originally Posted by Loud Pedal View Post
FYI...I had heard that about OFI-took my daughters TDI to them for an IP and injectors rebuild-My experience was "less than stellar"
I see you are in Oregon, so guessing you are close (so am I) PM me if you want to talk shop
I also have not heard great things about OFI, glad to see other Oregonians on here, everyone seems to be Canadian or from back east <img src="https://www.cumminsforum.com/forum/images/smilies/wink.gif" border="0" alt="" title="Wink" class="inlineimg" />
Oregon Chapter. We need leather jackets. Who’s mom can sew on the patches?
04-09-2019 01:31 AM
myother4x4isaCJ7
Quote:
Originally Posted by Loud Pedal View Post
FYI...I had heard that about OFI-took my daughters TDI to them for an IP and injectors rebuild-My experience was "less than stellar"
I see you are in Oregon, so guessing you are close (so am I) PM me if you want to talk shop
I also have not heard great things about OFI, glad to see other Oregonians on here, everyone seems to be Canadian or from back east
04-09-2019 12:55 AM
Millionmiles
Quote:
Originally Posted by GAmes View Post
You do know there is a free factory service manual download in the stickies don't you? If you prefer not to get your computer greasy there is my go to, the printed version.

https://www.genosgarage.com/product/...ervice-manuals

Since you are a customer of Oregon injection you must live close to Eugene? So does one of our other members, who I see almost every time I go to visit my grandkids in Salem.
I’m definitely getting one of those manuals. Thanks man
04-09-2019 12:36 AM
Loud Pedal
Quote:
Originally Posted by Millionmiles View Post
My 97’ 12v is constantly needing this done. I take it to Oregon fuel injection for fuel filter changes and any thing else connected to the fuel system because they are supposed to be specialists. They rebuilt my injectors and did the trimming on my fuel pump at 200k. Could a dirty fuel filter cause this kind of low idle? Last time they adjusted it they said they might not be able to adjust it again. Said my pump might have to be rebuilt? It starts up immediately and runs great. Has 337,000 miles and the motor sounds better then my 2004 that has 124,000.
FYI...I had heard that about OFI-took my daughters TDI to them for an IP and injectors rebuild-My experience was "less than stellar"
I see you are in Oregon, so guessing you are close (so am I) PM me if you want to talk shop
04-08-2019 07:26 PM
GAmes You do know there is a free factory service manual download in the stickies don't you? If you prefer not to get your computer greasy there is my go to, the printed version.

https://www.genosgarage.com/product/...ervice-manuals

Since you are a customer of Oregon injection you must live close to Eugene? So does one of our other members, who I see almost every time I go to visit my grandkids in Salem.
04-08-2019 05:03 PM
Millionmiles
Quote:
Originally Posted by GAmes View Post
Quote:
Originally Posted by Millionmiles View Post
I will change the filter and go from there. If it’s still low idling I’m gonna take it to someone else. Get that second opinion. Thanks guys.
Does that mean you don't do any of the work yourself? Adjusting the idle only takes a 10mm wrench and a bit of contorting your body. Measuring the length of the throttle rod requires a ruler.
I do stuff that I know how too. None of my buddies have diesel’s so I am on my own. Coolant flushes
Brakes disk and drums
Fuel, oil, and air filters
Serpentine belt
Alternator
Getting ready to do the thermostat and water pump on my 04.
But I have never opened up a motor. Guess I will try to do the idle adjustments on my own. This site has been crucial for my mechanical confidence.
04-08-2019 04:50 PM
GAmes
Quote:
Originally Posted by Millionmiles View Post
I will change the filter and go from there. If itís still low idling Iím gonna take it to someone else. Get that second opinion. Thanks guys.
Does that mean you don't do any of the work yourself? Adjusting the idle only takes a 10mm wrench and a bit of contorting your body. Measuring the length of the throttle rod requires a ruler.
04-08-2019 04:47 PM
Millionmiles
Quote:
Originally Posted by SFGiants View Post
Quote:
Originally Posted by Millionmiles View Post
My 97’ 12v is constantly needing this done. I take it to Oregon fuel injection for fuel filter changes and any thing else connected to the fuel system because they are supposed to be specialists. They rebuilt my injectors and did the trimming on my fuel pump at 200k. Could a dirty fuel filter cause this kind of low idle? Last time they adjusted it they said they might not be able to adjust it again. Said my pump might have to be rebuilt? It starts up immediately and runs great. Has 337,000 miles and the motor sounds better then my 2004 that has 124,000.
As for a dirty fuel filter causing low idle: yes, I would think this could be a cause. Dirty filters can lower your fuel pressure, and if bad enough, might affect idle.

Your pump should not have to be rebuilt from adjusting the low-speed idle if done correctly. Are you sure they are adjusting the low-speed, external idle screw at the lower firewall side of the pump? There is a tamper-proof high-speed idle screw that exists as well, though this shouldn't be messed with.
Quote:
Originally Posted by GAmes View Post
In addition to what @SFGiants posted, if they are adjusting the rod like the OP did you will have the same issue. My IP is the original.
I will change the filter and go from there. If it’s still low idling I’m gonna take it to someone else. Get that second opinion. Thanks guys.
04-08-2019 01:22 PM
GAmes In addition to what @SFGiants posted, if they are adjusting the rod like the OP did you will have the same issue. My IP is the original.
04-08-2019 12:36 PM
SFGiants
Quote:
Originally Posted by Millionmiles View Post
My 97í 12v is constantly needing this done. I take it to Oregon fuel injection for fuel filter changes and any thing else connected to the fuel system because they are supposed to be specialists. They rebuilt my injectors and did the trimming on my fuel pump at 200k. Could a dirty fuel filter cause this kind of low idle? Last time they adjusted it they said they might not be able to adjust it again. Said my pump might have to be rebuilt? It starts up immediately and runs great. Has 337,000 miles and the motor sounds better then my 2004 that has 124,000.
As for a dirty fuel filter causing low idle: yes, I would think this could be a cause. Dirty filters can lower your fuel pressure, and if bad enough, might affect idle.

Your pump should not have to be rebuilt from adjusting the low-speed idle if done correctly. Are you sure they are adjusting the low-speed, external idle screw at the lower firewall side of the pump? There is a tamper-proof high-speed idle screw that exists as well, though this shouldn't be messed with.
04-08-2019 12:24 PM
Millionmiles My 97’ 12v is constantly needing this done. I take it to Oregon fuel injection for fuel filter changes and any thing else connected to the fuel system because they are supposed to be specialists. They rebuilt my injectors and did the trimming on my fuel pump at 200k. Could a dirty fuel filter cause this kind of low idle? Last time they adjusted it they said they might not be able to adjust it again. Said my pump might have to be rebuilt? It starts up immediately and runs great. Has 337,000 miles and the motor sounds better then my 2004 that has 124,000.
03-08-2019 04:44 PM
SFGiants
Quote:
Originally Posted by ctmaybury View Post
One simple trick I did: paint the idle nut head with a criss cross. I used yellow and blue for contrast. You can now put a visual on fine turns of the adjustment.
That's a fine idea. I'll do this next time I need to fool with it.

I took a bit of tension out of the TCV cable, so it now has the slightest amount of slack when the throttle lever is at idle position. I think this adjustment was necessary as the truck is back to shifting like it did prior to me messing with the linkage. After I screwed up the linkage spec, it seemed to raise the shift points to a higher RPM even under only moderate-slight throttle, and it also didn't shift as smoothly. My guess is the tiny bit of tension on the TCV cable was the culprit here.

As always, thanks for the help everyone.
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