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Unread 02-26-2016, 07:34 PM   #1
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Default Motor "dies" without constant pressure on the gas pedal(Mazda 626 GT 1986)

Hey, when I start my car ( Mazda 626 GT ca. 1986) it starts OK , but to keep the engine alife I must have constant pressure on the gaspedal, as you can imagine is a big problem. If it would have been a car with a lot of rust and many problems had it not been a problem, I would have sold it or something, but it's actually the only problem with the car (only small problems that can be corrected in a short time).

It was used by my grandmother who used it very little, maybe twice a week back and forth to the store, it was also outside all seasons. All routine checks are followed up and all is well , it is only in recent years it has been that way and built up gradually worse and worse .

Have had it in a varshop in a year to a buddy of my father while I was in the military but he could not find out the problem, if anyone has any suggestions on what it could be i would be very happy!
Thank you

Last edited by Danielsiq; 02-26-2016 at 07:51 PM.

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Unread 02-26-2016, 08:13 PM   #2
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Other than it not wanting to stay running without you pressing on the gas pedal, does it drive OK? Does it misfire and not have much power?

Trying to establish if it's an issue with the idle system or not.

If it has power and simply won't idle on its own, then it may be a hose off (hissing sound) or a problem with the idle control.

If it has no power than you need to dig deep as to what might be the problem.

With the hood open have somebody keep it running while you look and listen under the hood. If you hear loud hissing see if you can locate the source.

Let us know what you find.
2003 GMC Envoy 5.3

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Unread 02-28-2016, 07:03 PM   #3
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car guy's got it. Sounds like an idle air control valve failed.
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Unread 02-29-2016, 03:58 PM   #4
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it may be simply dirty, idle channel is pretty small, not hard to get clogged, i have seen it happen on old high mileage cars.
usually removing throttle body, idle control solenoid, maf sensor (if before throttle body) , and cleaning all with toothbrush and carb. cleaner gets such idle problems fixed.
now if throttle body, and air bypass canal seem clean, remove idle solenoid sometimes the valve, gets stock to the valve seat. also inspect connections, loose plug or loose wire in the plug,

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