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Old 02-11-2017, 04:29 PM   #1
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stalling after coming to a stop

My car seems to stall sometimes or idle real low to point where it nearly stalls after deceleration and coming to a stop. I haven't noticed it do this when I simply start it and let it idle for a long period. It may be only happening with the clutch disengaged too. It tends to keep happening once it starts and turning on the a/c will keep the idle up.

I've changed the iac valve (this was definitely bad), fuel filter, fixed a collapsed pcv hose (and the parts store gave me the same crap without the shielding), replaced leaky valve cover gasket, cleaned the pcv valve, replaced spark plugs and wires.

Haven't cleaned the maf yet, but about to. My guess is that there is a vacuum leak, but if this only occurs with the clutch disengaged? I'm concerned it could be something else.


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Old 02-11-2017, 04:46 PM   #2
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The PCV valve itself needs to be 100% open at the small bleed hole it uses at idle. The TB aircrack needs to be 100% clean too.

Engines use very little air at idle but it has to 100% all be there or you have issues.

An older engine with lower compression can do it too.
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Old 02-11-2017, 04:56 PM   #3
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127000 miles on it. I tried changing the pcv valve once and it ran like trash with the new one I tried to replace it with (as in billows of black smoke out the exhaust), hence i just cleaned the original. Guess it was wrong part or defective...

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Old 02-13-2017, 02:03 AM   #4
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I never change them, cleaning them as needed only. Too many of them look alike but the bleed holes inside are rated for the specific engines. people buy them and return and mix them up all day long. Some don't have part #'s to be able to identify which is which.
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Old 02-13-2017, 11:02 AM   #5
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I would check your front o2 sensor readings

I would then check your idle with the IACV unhooked

I would clean the IACV

Tom
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Old 02-14-2017, 09:02 PM   #6
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I changed the idle air control valve recently. It was a pain in the fing ass to change. It's entirely possible I guess that's where a vacuum leak has formed as I put it on blind and didn't put anything on the new gasket to ensure it's kept in place.

It just seems weird that it only happens intermittently and only after I've come to a complete stop. I can hear a slight pinging type noise when I put a screwdriver on the tranny housing, but that might be due to a broken engine mount or perhaps something else went out of wack when I ran my left front tire into a median concrete wall and bent the assembly by roughly 90 degree angle to cause that noise (only noticeable damage at the time to the left front wheel).

But, all that said, steering seems fine and she steers straight with my hands off the wheel. The shop in NJ fixed me up nicely when I crashed it on the highway that one time. Haven't noticed any other issues except for a new evap code pointing to my gas cap.

Last edited by dhath81; 02-14-2017 at 09:08 PM.
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Old 02-14-2017, 09:58 PM   #7
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Gas cap codes can be small evap leaks that can be the same as a vacuum leak. Like said, checking front O2 readings might show a leak up.
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Old 03-17-2017, 12:33 PM   #8
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In the midst of shopping for a new car because i'm so d&#m tired of this ST stalling, it reared its ugly head again. This time showing "Engine Fault" and the CEL staying lit. I took it to my local dealer who knows me better than my wife by now. The computer reading showed a code P0106. Bad MAP Sensor. Part # CV2Z9F479A replaced and he even waived my $100 deductible for my ESP.

I can tell you that in the past few days, my idling has been very steady and no stalling so far. This was an issue i've been fighting two local dealers with for the past 2 years.
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