After discovering that I had a bad idle air control valve, I swapped in a new one from Oreilly's. Did the reset and it ran fine for a few weeks and now its right back to the same thing. Starts and runs fine for a while but, after a long haul it starts dying and then shuts down. When I pull the IACV out it has run the plunger plug thing all the way out and that's what is killing the engine. I can push the plunger in and the engine will start but shut off till it has cooled off some. I will also add that it is hotter than nine hells at the intake. So hot I cant touch the IACV with out a rag.


My question is, what controls the IAVC? Why is it closing when the engine is up to temp? Am I getting close to over heating even tho the temp gauge shows normal and there isn't any coolant loss?


Today broke my will. I sat for five hours on the side of the interstate. I almost unhooked the boat and burned the dam thing.

 

What year?

 

It is a 1998.

 

Do you have a ultra gauge or scanner?

Codes

When I had a similar issue mine was a bad fuel sender shorting the TPS, look in my thread


Not saying it is your problem but mine was short term solved unplugging the tank pressure sensor on fuel sender, long term I replaced the tank sender and had the ecm values reset by a private rover shop

 

Its not giving a check engine light. I took it to Oreilly's and they told me they couldn't scan it without the light.


I believe your issue kinda sounds like mine. I do smell fuel sometimes when its trying to die. Maybe a bad fuel pressure regulator or o2 sensor? Maybe it is trying to adjust the air to compensate for too much fuel?

 

Mine did not throw a code, but with live data like with an ultra gauge I could see I lost TPS voltage, was intermittant run like crap till I lost it all together then it would not run

You could pull the rear carpet access the fuel sender and unplug the pressure sensor see if that helps

Can be hard to diagnose without a data reader


Also is it worse when warmed up? That can be the crank sensor getting hot, next time it dies pour water on the sensor to cool it see if it restarts

You may simply need the ecm values reset from changing the IACV some guys get away with out the reset