Possible Sensor problem?
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Junior User
Joined: Apr 2003
Posts: 57
Likes: 0
From: Troutville VA
Possible Sensor problem?
Just recently my truck will not start on the first crank and may take 3-4 before it will turn over. It will crank but it will not idle high enough and just die and after a couple tries it will start and I'm ready to go and it acts fine. It's very inconsistent and doesn't happen too often but it's annoying. Had a few people tell me it's probably a sensor. TPS or something or other. Anyone had an issue similar to this and can help with some advice? No othe known issues at all. I have changed the fuel filter recently but this problem didn't happen directly after.
99 DRW 6.8L gas
99 DRW 6.8L gas
Lead Driver
Joined: May 2003
Posts: 9,303
Likes: 48
From: Lyndonville, Vermont
Possible Sensor problem?
Idle air control valve dirty or bad.At least pull it and clean with carb cleaner.. Could be tps but I doubt it.
To test put your foot on the accel and give it a little.... while cranking that will simulate the IAC being open...Give just a crack.
The IAC controls all the idle the throttle plate is basically closed on fuel inj vehicles.
To test put your foot on the accel and give it a little.... while cranking that will simulate the IAC being open...Give just a crack.
The IAC controls all the idle the throttle plate is basically closed on fuel inj vehicles.
Thread Starter
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Junior User
Joined: Apr 2003
Posts: 57
Likes: 0
From: Troutville VA
Possible Sensor problem?
Thanks for the advice. I'm looking for the IAC now. Is it attached to the throttle body? I do see some type of module attached to the throttle body with a plug and 2 screws holding it on. Can't find anything else? If it is it, it will be a pain in the *** to loosen those two screws to get that module out. 
Logistics Pro
Joined: Feb 2000
Posts: 3,955
Likes: 50
From: Mesa
Possible Sensor problem?
There is one large (5/8" maybe) hose on the IAC. It comes from the intake snorkle. The IAC is located on the passenger side towards the back of the engine. It's a PIA to get to, at least for me it was. There are 2 bolts holding it on. They face the firewall. There is a pic of it on this site somewhere.
