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Comments
If you suspect the IAC, have you tested it yet? From what I've read, the IAC valve is something that receives data from other sensors as well. Coolant temp, AC, accessories etc. It is supposed to compensate for the load you are putting on the engine. i.e. if you turn the AC on while idling, the engine would normally slow down due to the increased load, thus making the IAC compensate for that and speed up the engine to keep is from stalling. If you disconnect the IAC while the engine is running and put a load on the engine, the engine should stall which indicates the IAC is working. If this is the case, the IAC probably isn't the problem.
Sounds like it may be an air blockage issue. Maybe a vacuum line that is restricted or pinched that is plugged into the intake? You know how an engine will speed up if the choke is on? Same principle in my opinion.
Good luck.
Thanks for responding, yes I have tested it and even changed it out but it has started happening again during the warm weather. I have been looking for vacum leaks for some time but so far nothing. I am thinking the problem might be in the PCM since the fast idle issue disappears whenever I shut the vehicle off and restart it. I will keep trying to figure this out since the mecnanics seemed to be puzzled. Once again, thank you for your prompt response.
After a quick search on google and reading from this Q & A, it sounds like there may be something shorting that leads back to the PCM. You might want to do a little reading here and maybe even post a question to these guys. I'd hate to see you spending money on guessing what might be wrong, only to have to spend more on something else. I know it gets frustrating so hang in there. Personally, I think at this point, I would attempt to find a schematic that shows you what connects to anything that has to do with idle speed.
http://www.2carpros.com
vikan
Again, Thank you for the information, I will check out the link you provided and see what happens. I too have thought it was a short but then I was told by a good source it could actually be the PCM going bad...
i have had this truck for 3 years now..she's been a real good truck.. but the other day i got off the highway and came to a stop..and it just died..took about 45 minutes for it to start back up..got it about 4 miles more and it died again..took 2 hours for it to start again..got about 3 blocks and died..had it towed home the rest of the way.i have replace fuel pump,filter,thermostat,map sensor,throttle sensor, coil
i can go ut side now and she will start right up but as soon as she warms up it dies.
the igition works fine ..to me something is getting hot and shuts engine down till it cools back down...please if anyone can help i would be grateful this truck is my lively hood and i need her back on the road... thank s :sick:
i have even changed thermostat.. the problem i have when truck is cold it will start right up but once it warms up it shuts down..the igition cranks real good but it wont start. i have checked the coil
it works..so if someone else has this problem and got it fixed please help..this truck is my lively hood and i need it back on the road. many thanks
Another thing to check is your vacuum lines going to the intake. If the idle seems rought spray a soapy water solution around the vacuum line fittings. If the idle smoothens when water is sprayed, you have a vacuum leak.
The last possibility I can think of without spending a lot money is vapor lock. Make sure your vent lines for the fuel tank are not plugged. I believe the engine compartment holds the gas fume recycling canister (not the exact name) which has vent lines that run from the fuel tank to the canister (charcoal filled for emissions) and back to the tank again. The easy test would be to drive without your gas cap on.
Good luck.
I am starting to have a issue. My truck ( 1996 jimmy v6 vortec) has ran flawless, but all of a sudden I will be driving down the highway and it just quits. I put it into neutral and it starts up and can drive again. Sometimes for an hour or 2, and sometimes it will do it again right away. This is happening when the vehicle is warm and at highway speed.
When I am in town this rarely happens, it will only happen if I just came from the highway and am just getting into town it might just die.
I thought it might be a bad batch of gas, but it has happened for a month now. I thought it might be a new stereo that I got put in, but it still happens when I leave the faceplate off the stereo. I am at a loss of what to start to check what is causing this as parts for this truck are extremally high. It has had regular oil changes and has recently had a tune up.
thank you for any suggestions.
Thanks,
Richard
So far I have not been able to figure this problem out, yours sounds a little bit worse than mine but the same issue of once it gets warm the idle speeds up then after driving it for a little while it acts like the engine is starving for air. I will have to pull over, shut the engine off and start it back up again and it is fine (the idle returns to normal). I have 2 other sensors that I am going to replace to see if these are the problems. The Air Flow Sensor or the TPS (Throttle Pos Sensor) if these do not correct the problem I have been told the PCM may need replaced.
If I was to do mine I would loosen all the bolts on the passenger side of the bed, leave the nuts on a few threads. Don't forget the wiring, ground, tail lights, fill hose etc.. Remove all the bolts on the driver side, jack up the driver side until you have enough clearance. You must trig the bed really good so it will not fall on you.
Well dropping the tank is not too bad if empty, if lots of fuel you need a jack.
FWIW the pumps don't usually blow the fuse, a short in the wiring would.
I can't seem to put enough water or coolant in the radiator. I fill it and can stand there and watch the level go down. The radiator just never seems to fill. The other thing is I turned on the heater and it started blowing hot air but then it turned cool. Don't know if these are connected or not? Any suggestions? Thanks, Doc
FredS
-Jim
It is getting harder to use the brakes.
The fluid level has not changed.
Once I push the brake hard and felt a pop and the brake pedal pushed back.
Vacuum problem?
Master cylinder Problem?
????
Any Ideas
Thanks inadvance
:confuse: