Warm start idle problem
I've been noticing a problem lately where I'm driving my car enough so its fully warmed up, I park and shut it off, then a short while later when I restart the idle is low, and drops and the car wants to stall if I don't give it gas. This goes away after a minute or so, and it doesn't happen if the car isn't warmed up already. Any ideas?
I had idle issues on cold start before when my air pump died. I thought replacing that would take care of all of these problems, but it only helped the cold start idle. Any ideas? Thanks, jds |
bump!
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get a compression test done or do it yourself. Trouble idling or starting when warm is a notorious problem for low compression motors.
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Originally posted by yy4u get a compression test done or do it yourself. Trouble idling or starting when warm is a notorious problem for low compression motors. |
Ugh, that's not the answer I was hoping for! :-(
For what its worth, this condition only lasts a minute or two, and there's never a problem starting, just keeping it from stalling. Ugh. Compression test :( |
If its only temporary its probably something else then. Didn't mean to scare ya ;) Not sure what it would be though, maybe one of the experts will chime in.
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I use to have a similiar problem, for me it was that the engine would partially flood making it really hard to start up. That was my problem not sure if that's yours just a suggestion.
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My ex ('87 T2) used to flood easily on warm start, but in that case it just flat out wouldn't start. I suppose it could be a similar case with slightly different symptoms, but there is never any problem with it starting. Even if I stall it it starts right up again.
jds |
same problem
I have the same problem even though I got new rotors and housings. I do not think it is a compression problem.
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What ems you running? I have a PowerFC and have them same problem - though not as extreme. It starts fine when warm but runs like crap up to a little below operating temperature. I have never gone through my settings with the datalogit for this but I suspect there are some temperature related settings that can adjust this. It is on the "to do list" but far down.
Shawn |
I'm on the stock ECU right now until I can get my Pettit ECU fixed.
jds |
I was searching for something else, unrelated to this thread, when I came across this hot start problem that I used to have back in my FD days :)
Mazda, in their infinite wisdom, put an actuator inline of the vacuum hose going to the fuel pressure regulator. When under hood temperature reaches a certain level during a warm restart the actuator cuts off vacuum going to the FPR which raises the fuel pressure at least 10 psi. I had the same exact problem with my FD, and sure enough every time it would do it I would see the elevated fuel pressure on my Defi gauge....as soon as the pressure went back to normal the idle would too. The best part of all this is that I think Mazda worked this control feature into the ECU to help warm starting! I hope this helps. |
Oh and I forgot to mention...if you never want it to do it, you can just bypass the actuator and run the vacuum hose straight to the FPR.
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Pressure Regulator Control solenoid if I'm not mistaken. If anything this should help the car during warm starts.
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sometimes if you have removed the AWS hose it happens. if you have a greddy elbow then it's probably off.
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