Quote:
Originally Posted by briang0
I am still having trouble with the truck. I tried replacing the IAC and it made no difference. Here is what I have noticed. When the truck is cold and I start it up it will run, it is idling at 1000 rpms but it is a little rough. It chugs when I put my foot on the gas. After a few minutes it smooths out. Also there is a definite smell of fuel in the exhaust. After it warms up it idles fine nice and smooth. If I shut the truck off and wait about 10 minutes it will start right up but after idling for a couple of minutes it will stall out. What happens is the rpms will drop a couple of times and then it will die. It starts right back up and will be fine as long as I give it a little gas after it starts. I am going to check the fuel pressure tomorrow but I installed a brand new fuel tank and pump assemble in October so I'm not expecting a pressure problem but stranger things have happened. I'm getting read to send it to the mechanic I'm getting tired of spending money and time on it just want it fixed.
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with your engine I do not have the exact details . I believe however your air cleaner should have on the TBI a hot air tube to the exhaust manifold. the air cleaner has a temp door to keep the air entering the engine at a warm temp during cold weather ..is this working correctly?
with this missing/ rusted off, or stuck to allow only cold air to enter the intake you will have the issues you describe..
vacuum leaks must be checked with a vacuum guage ..most times at the engine these hoses get damaged...but this old could be anywhere which is why I suggest the vac guage...PCV operation can be checked with this.
the engine coolant sender must be working correctly to properly control the fuel mixture .
If the computer/ecm had bad ground this could very well have damaged it.