car wont keep a steady idle, when driving it, it "hiccups" shoots a flame out the exhaust and then drives fine till the next hiccup(which are frequent). checked for vacuum leaks, and did not find any. wideband shows the AFR to be all over the place both rich and lean.
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the vaccum gauge in the car is reading at 20 for a majority of the time when the car is running poor -
Backfiring like that means unburnt fuel is going out the exhaust, I would do a compression test to see if there is a dead cylinder, even if it is still firing on all cylinders the compression could be low enough to not completely burn the charge and send it out the exhaust.
'89 Alpine S52 with goodiesComment
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no offense, but I really hope you're wrong.sigpicComment
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could also be timing i suppose, the t-belt could have slipped a tooth or something
'89 Alpine S52 with goodiesComment
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Unplug the o2 sensor and run that fucker open loop.
YEAHHHH DOGGY!
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I didn't actually know what to do.
... I just wanted to say yeah doggy.
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Well I did do a T-belt recently, when I did my refresh. I was under the impression that because the m20 was an interference motor the valves would hit if it were off even the littlest.
BTW autocross was freaking awesome! I didn't get to drive my car, but I took Ricksloans 335...Yeah doggy!!!sigpicComment
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It would be a help to know what car this is. If one with an M20b25 engine (325i/is) I'd suspect the CPS, harmonic balancer, or something that is interrupting power to the DME.The car makes it possible, but the driver makes it happen.
Jim Levie, Huntsville, ALComment
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Anyways the timing belt apparently is not the problem. Onward to harbor freight to get a compression tester...sigpicComment
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Here is a link to a video i made... Its not optimal because there is music and video from the autocross, but I don't want to upload another video. maybe someone will know what is wrong by the sound. idk i figured it may help. You can hear the sound my car is making past the video. Mines the black e30.
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Hmm cam timing, or a sticky/bent valve
maybe?1989 cirrisblau-metallic 325iComment
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