Stalling after coming to a stop
#1
Yes today my 04 Mach1 died after coming to a stop. Any ideas anyone? I'll pull the codes to see what gives. The check engine light is not on yet.
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#2
I had the same issue with mine. Might not be the same issue but in my case it was because the K&N filter had too much oil on it and it got a mist on the mass air flow sensor. I removed all the intake system and replaced it will all the stock stuff and never have had a problem since :) I could have probably cleaned the K&N and put the correct amount of oil on it and it would have been good but I wanted my Mach to be stock anyways :)

Let me know if yours is stock or if it has a cold air intake system on it :)
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#3
I've heard it is usually the Idle Air Control (IAC) Valve (below the rear of the Shaker, two small bolts and wiring harness plugged into it. Other folks have said replacing the EGR valve gasket or cleaning the MAF screen will fix it. My 04 Mach is an auto and has never stalled out yet (knock on wood)!

I did do the restrictor plate modification to the IAC. I cut out a piece of a soda can to match the gasket. One air hole I made the same size as the original hole, but the second hole I made a lot smaller. This mod will slow the car down when you take the foot off the gas. I did this back in the summer and no impact to performance or gas mileage. There are a lot of write-ups about it on the M1R site.

Good Luck!
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#4
Goodpost

Hopefully a lot of this stuff will be here! Seems people signed up, posted a little and disappeared, hopefully they still come around more.
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#5
Anything new to report on the Stalling Mach?
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#6
It has not stalled since. It was really cold that day - maybe that had something to do with it.
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#7
(12-14-2009, 11:18 AM)vamach1 Wrote: It has not stalled since. It was really cold that day - maybe that had something to do with it.

Thats good, maybe it was trying to tell you that it didn't like the idea that it was out in the cold and wanted to be put back in the garage LOL Mine only did it a couple times but that was a couple too many. Still have the Cold Air kit in the basement but doubt I'll ever re-instal it.
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#8
I almost hate to bring this one up again since it has been dead for about 3 months. I figured I would go and shoot for the moon. Being new to the site I was looking around and found this particular problem that just happen to have started in my Mach. It’s been infrequent, but troublesome. I too have pulled up to a stop and had the engine die. Several times of late. But with some of your alls intuitiveness, and to mention, I had not so long ago cleaned and re-oiled my filter. I have come to the conclusion that maybe I should pull that darn filter and clean it again. This time not coating it with as much oil as I thought it might need. I did follow the instructions for the re-oil kit. I may even just put on a replacement paper filter to see if this solves the problem Hummm.SCo_hmmthink Think we may be on to something. DuhToo Kwel !
Peace!
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#9
I think your on the right track to try the paper filter to see if that helps. If it does use less oil on the cold air kit filter. Let us know if that is the problem.
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#10
Like Rare Pony mentioned. It's usually the idle air control valve. I don't own a late model Mach 1 but I'll put in my 2 cents. My experience with fuel injected motors, my wife's 96 Mustang GT, my 95 F150, and 8 years work as a mechanic and GM tech when I was younger is that after about 4 or 5 years the IAC starts to get slow to respond. Sometimes removing and cleaning it with carb cleaner will breath a little life back into them. If you need to replace it, it seems the Motorcraft IAC works much better than any after market IAC.

Also, make sure the throttle body is clean and if it has an air trim bypass on the throttle body, make sure it is also clean. At least open the throttle blade and wipe it out with a rag to make certain it is clean. Cleaning the throttle body is sometimes enough to stop an intermittent stall at idle. On fuel injected cars, with only air flowing through the intake, the oil vapors from the crankcase vent tends to get the throttle body and inside of the intake dirty.

I don't know how to check the minimum idle speed. I will say, when I was a GM tech, we often had to increase the minimum idle speed above the factory spec to prevent an intermittent stall. It would sometimes occur at idle, in gear, all accessories turned on and turning the steering wheel to add one final load on the motor.

That's about all I can offer on this topic. Good Luck.

Best Regards,
Mike
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