Random erratic idling(video)
05-12-2014, 12:27 PM
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W203 C200K (2001)
Random erratic idling(video)
Hey guys , my car started doing this weird erratic idling on cold start, doesn't happen everyday and I have no clue what could it be, checked sparks and wires and they seem ok to me , any tips ? Gasket ? Etc...
Here's a video, check how it all suddenly stops at 0:49
Here's a video, check how it all suddenly stops at 0:49
05-12-2014, 03:24 PM
#2
Could be a lot of things. Dirty/Defective MAF, dirty throttle body, etc. I'd start cleaning those first & see if you see any results since those are the easiest. Autozone sells MAF cleaner & carbon cleaner for those purposes.
05-12-2014, 03:59 PM
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W203 C200K (2001)
The MAF is new, only got 1k Km on it, i think if it was bad it would probably have failed earlier. I have a spare one anyway and i'll try putting it and see, the throttle body i didn't look at yet, but i'll surely take a look at that tomorrow, seems like a good idea, I'm not sure if the sound it's making is misfires or something else, does it sound like misfires to you ?
05-12-2014, 04:54 PM
#4
If you were having misfires, you computer would detect is & throw a CEL code. Is your CEL on? & What kind of MAF is it? I know aftermarket MAFs are not good & causes a lot of trouble.
05-12-2014, 04:56 PM
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No, no CEL light !, I'm going to pull codes tomorrow and see if it says anything special, yeah it's an aftermarket MAF, maybe that's the issue.. I'll give it a good look tomorrow, I didn't get it "calibrated" on STAR since installing though..
05-12-2014, 05:00 PM
#6
I'm 95 percent sure it's your MAF now that you say that lol. I had an aftermarket MAF in january, If I were to drive it quickly after a cold start, my car would jerk VERY violently. It would go back to normal driving after a couple miles. Got a refund from eBay, bought a used one from an old 2002 e320 for $35, has been working perfectly ever since.
05-12-2014, 05:15 PM
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oh wow, that's interesting, will give that a try and see, if that's the issue then i'll probably go for an OEM one, did you do this calibration thing though ??
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05-12-2014, 05:20 PM
#8
Calibration? I tried doing some kind of reset that involved the gas pedal when I had the aftermarket one, didn't work. With the OEM one, I didn't have to do that, it worked right away.
05-12-2014, 05:23 PM
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Yeah i know the gas pedal reset trick, however i've read at a few places before that installing a MAF needs calibration on STAR ... I'll try to confirm that, if someone else knows please correct me !
05-13-2014, 12:03 PM
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You were totally right, seems I got a crappy MAF, unplugged if and the engine was really smooth again, so I'll just install the spare one I have !
Thanks for the tip !
Thanks for the tip !
