I have 92 eagle talon tsi/ turboed thats hard to start all around starts when cold but takes a few but when warm the only way to get it to start is too unplug the airflow sensor then it will start. i got the car with a blown headgasket i replaced that and the head bolts alonge with the isc motor and a new turbo also i have verified timing placement on the gears and belt along with that i checked the vacume pressure at the line that comes from the blowoff valve it was very low around 12 i believe im thinking that one of my temp sensors are out it has no resistance but would that make it nearly impossible to start warm note to that i let it sit for 10-15 min i can start it with the airflow unpluged but if i try right after i shut down it wont everstop i have also checked for vacume leaks with starting fluid and no leaks found so far thanks in advance for your assistance any ideas would be greatly appreated
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yeah, eclipse/talon does have alot of problems with the IAC motor being no good, but by your description, it sound more like a vacuum leak, to trace for a vacuum leak isn't fun, check all your vac hoses for cracks just being so old, anything could happen, make sure your intake manifold is not leaking, that's what happened to mine, or the easiest way is to take the car to a shop that has a "smoke machine" what it does is put smoke into you intake manifold, where ever there is a leak, the smoke will finds it way out, make it alot easy to find vac leaks
Just an idea, but I think that you are onto something with the temperature sensor. If overheating was the cause of the head gasket to go, then I would imagine it would've fried the temperature sensor also. That would make it nearly impossible to start. The sensor should be fairly cheap enough to replace. Probably wouldn't even through out a code. My Mother-in-Law had the same problem with her Saturn, changed the temp. sensor and BINGO. No more problem. You just have to make sure you get the computer temperature sensor, not the fan temp. sensor. There are 2 of them suckers. Believe it or not. Hope this can help "with your idea". Best wishes.
definately air leak. mine is non-turbo, but has a large crack in the intake tube. Course, i'm a little lazy, so I just unplugged my airflow sensor and set idle up a few hundred to get rid of most of the lope. Let me know if this helps :)
Here are a few things to try:
1) Block off your EGR valve. Sometimes these fail, and when they do, this is what happens.
2) Change your vaccum hoses, especially the one going to the fuel-pressure regulator. Sometimes this one leaks and creates problems for the FPR.
3) Change your plug wires. I'd use some MagnaCore wires. They're less $$$ than the stock ones, and they're 8.5mm opposed to the stock 6mm. The stock wires are no good, especially when raising the boost.
4) Clean your throttle body REALLY well. Make it spotless, including both sides of the throttle plate.
5) Clean out your intercooler. Do this by taking it out, dump about a gallon of gasoline into it, then shake it around and dump out. Repeat process until gas coming out is clean.