86 NA dies/loses power when hot
06-11-03, 10:08 AM
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86 NA dies/loses power when hot
Car:
Beater NA Base Auto
117,000 miles, Gutted Cats/Testpipe, Emissions (ie Airpump Intact)
Maintenance so far:
New NGK Leading and Trailing plugs
New Air filter
Scheduled: Compression Test and fuel filters and software change on intake
Symptons:
Car will start and run fine. After ~30 miles of Late Afternoon driving, car starts responding Sluggishly; eventually it loses the ability to drive down the road under its own power. Let car sit for 2-3 hours and it will start and drive fine until it heats up again.
Oil pressure is good (60+ PSI)
Water Temp rock steady mid gage, no bubbles in coolant.
My gut reaction is the ECU is developing a heat related fault, If that is the case It will be cured with the new EC during the AT-> MT conversion this weekend.
John
Beater NA Base Auto
117,000 miles, Gutted Cats/Testpipe, Emissions (ie Airpump Intact)
Maintenance so far:
New NGK Leading and Trailing plugs
New Air filter
Scheduled: Compression Test and fuel filters and software change on intake
Symptons:
Car will start and run fine. After ~30 miles of Late Afternoon driving, car starts responding Sluggishly; eventually it loses the ability to drive down the road under its own power. Let car sit for 2-3 hours and it will start and drive fine until it heats up again.
Oil pressure is good (60+ PSI)
Water Temp rock steady mid gage, no bubbles in coolant.
My gut reaction is the ECU is developing a heat related fault, If that is the case It will be cured with the new EC during the AT-> MT conversion this weekend.
John
06-16-03, 03:03 PM
#6
Banned. I got OWNED!!!
Have you tried to check fuel pressure during the afflicted times? Could be an old fuel pump straining to keep pace for hours at a time.
Anytime I have a pretty hard-to-find driving/running problem that cannot be attributed to a problem in the block/engine, I go find a core motor or partscar that has all the "control system" still on it (by this I mean ecu, wiring, injectors, afm, tps, throttlebody, everything that gives the engine it's running personality) and change it over. IN this case, an s4 NA, you can swap all this stuff in an hour or 2 easily, and 95% of the time you will have fixed the problem.
Nex time you're tired of fighting a chronic hesitation or driveability problem, and you have ready access to parts, I suggest you try this approach.
Anytime I have a pretty hard-to-find driving/running problem that cannot be attributed to a problem in the block/engine, I go find a core motor or partscar that has all the "control system" still on it (by this I mean ecu, wiring, injectors, afm, tps, throttlebody, everything that gives the engine it's running personality) and change it over. IN this case, an s4 NA, you can swap all this stuff in an hour or 2 easily, and 95% of the time you will have fixed the problem.
Nex time you're tired of fighting a chronic hesitation or driveability problem, and you have ready access to parts, I suggest you try this approach.
06-16-03, 03:18 PM
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Originally posted by hypntyz7
Have you tried to check fuel pressure during the afflicted times? Could be an old fuel pump straining to keep pace for hours at a time.
Have you tried to check fuel pressure during the afflicted times? Could be an old fuel pump straining to keep pace for hours at a time.
I had a problem like this last year with my explorer. When id be delivering in it, it would get hot, and all of a sudden die. I could tell it was coming on too, because the car would get sluggish. Cost me a ton of money cause the ******* thing would die in the middle of a delivery. I had the fuel pump replaced before, and it was still under warranty. The service station concluded that was the problem. Replaced the fuel pump and had no more problems.
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