HELP! my 98 12 valve wont idle

slanteyedmonkey · 09-06-2007, 07:14 PM

yesterday i was coming home from work and pulling into the gym parking lot and noticed my engine was revving higher than normal to the point where i needed to hold down the brake harder and noticed my tach was at 1500 rpm without pressing the go pedal. then i found a parking spot and put into park. then the rpm's were like over 2000. my only reaction at this point was to turn the engine off. then i opened the hood and examined the throttle cable and all seemed ok but then again, i dont know much about this stuff. after moving it back and forth i went to start the truck up but it wasnt idling at all. in other words, now i have to hold the pedal down a little to start the engine but when i let off the pedal it just stalls. what do i do?

as a sidenote: the only mod i did recently was install a zero plate 4 days ago. all was fine until today.

as a sidenote: when i was driving home from work today i got a little aggressive with the go pedal, to the point where i may have jabbed it hard as opposed to a nice and easy foot pressure. this is what is leading me to think it has something to do with the throttle cable.

another sidenote: (and this is what is scaring me) when i installed the zero plate, my flathead driver bit for my hand torque tool fell out of the tool in the vicinity of the fuel pump. i DID NOT see where it landed. i must have looked for an hour but couldnt find it. i kept thinking there is no way that it fell in the pump where the groove is in the plate. but now i am thinking it did. could this be the cause or am i being paranoid?

I was able to drive it home but it was a pain in the butt trying to keep an even pressure on the pedal to keep the engine running, (as you may imagine).

well, i did find that flathead hand torque tool bit in the pump! i about freaked out when i grabbed it with a homemade magnet probe. it was at the bottom rear of the pump immersed in oil. it wasnt chewed up or anything so i don' think anything happened to the pump but it is uncanny that my idling problem began 4 days after it fell inside of the pump. is this just a coincidence? i hope so. i dont think the idle adjustment bolt needs to be turned since at first i was getting way too high idle and then absolutely no idle. it was though the linkage got stuck and then when it got unstuck, the idle went to zero.

today i have been playing around with the idle adjustment screw and i dont think this is the problem. i can adjust it to where i am getting 1500RPM and when i put it in Drive, it stalls. when i adjusted it to 1500RPM, the idle seems to go up and down by itself and i have to give it fuel to get it to go back down (sounds odd but thats the case). i dont think its the linkage. i lubricated all of the linkage with WD40 and it seems to operate smoothly when i manually actuate it by hand under the hood. i want to avoid going to a mechanic. i've been down this road and it is not pretty as you all may know.

illflem · 09-06-2007, 08:48 PM

I read of a fellow who lost a screw in his pump, same hard pedal symptoms.
Sorry to say it but he finally had to have the injection pump rebuilt.

StrokerSmoker · 09-06-2007, 08:59 PM

Sounds like something to do with the governor springs and weights.... The way it sounds you checked your pump and didnt find anything laying in the bottom.... When I messed up my pump the weights were layin in the bottom but it had the same symptons that yours has...

SS

slanteyedmonkey · 09-06-2007, 09:42 PM

now i am considering taking the truck off the road and parking it in the garage and doing this myself. if i buy a p7100 pump from somewhere like bd diesel, is it hard to swap out with the old one? i havent read much about this on the forum. StrokerSmoker, did you replace the pump yourself?

***pro99*** · 09-06-2007, 10:51 PM

Where are you located? May find someone to help you out if need be....

slanteyedmonkey · 09-06-2007, 11:32 PM

i am in raleigh, nc

Don Wagner · 09-09-2007, 01:43 AM

The governor weight assembly was damaged, find a Bosch certified shop to look into what will need to be replaced.

DieselDood · 09-09-2007, 02:54 AM

Sounds like one of the Governor assemblies were damaged. I'd find a pump shop to see if they can repair it. It really may be a simple repair within the pump.

Was it a bit you droped/lost or someone else?

slanteyedmonkey · 09-09-2007, 01:30 PM

i dropped it in the pump. i didnt realize i did it. i think it has something to do with the governor because when i was driving it home after the problem occurred it was like the truck was on nitrous oxide. it had huge power and the rpms were around 3000rpm's and i DONT have 3gsk installed. i am considering just purchasing a p7100 pump from BD-power or ATS that already has this mod installed and then paying to have someone else install it. does the installation of this pump cost alot?

also, i cleaned the prefilter out this morning and it wasnt that dirty. the fuel filter is new. i checked the overflow valve and that "looks" good. the linkage and throttle cable looks good too. i am pretty sure its the pump. i guess i need a mechanic to actually verify that it is the pump and then just go for it.

StrokerSmoker · 09-09-2007, 08:58 PM

I didnt replace my pump myself... I had a shop do it... I could have probably did it my self but would rather spend the money to know im getting it done 100% correct....SO i would defiantly try to find a reputable shop somewhere and have it done...

SS

slanteyedmonkey · 09-15-2007, 03:41 PM

i ordered the 300HP injection pump from bd-power. it shipped on friday. it has the 3gsk already in there. hopefully this will fix my problem. if it doesnt fix the problem then i will be

***Austin The DieselTech*** · 09-15-2007, 04:57 PM

It probobly would've been alot cheaper to have a pump shop rebuild your old pump than buy a new one.