Hey guys, I have an m50 swap with m3 cams and been having some odd problems lately. And I searched but couldn't find anything similar to my exact problem.
I got the alternator replaced a few weeks ago and when I got it back from the shop the idle would surge from 1k to 2k. I didn't think anything of it cause it would do it after the battery was unplugged but it would go away after a 15 minute drive or so. I expected it to go away but it didn't stop for a week. After it went away everything was fine until last Friday. I was driving to a friends house when all the sudden the car hesitated when I was accelerating and then it wouldn't idle at all. The RPMs would go up between shifts and when i rolled up to a stop light it would idle at 2k then sometimes raise up to 3k. I would have to drag the motor down by putting it in gear just so I wouldn't like an asshole at stoplights. I probably burned my clutch up by doing that but fuck.
I didn't drive the car for a few days after that until I took it to Rob at e30 Motorwerks yesterday. On the way there it didnt do it all which pissed me off cause I wanted him to see what was going on. We both checked it out, we couldn't find any vacuum leaks of any sort, or any problem for that matter. He gave me an AFM he had laying around and it calmed it down a little bit. But today I was driving and I was accelerating, not WOT but giving it some juice and then it hesitated a few times again. So I turned around and took my sisters car to where I was going.
Also the car has done this since I've gotten it but when I start it up it idles fine at around 700-800 RPMs but once I start driving and roll up to stop lights it stays at 1000 or 1200 RPMs. I haven't been able to figure it out.
What do you think is going on with this hesitation, fuel regulator? Sticking Vanos?
I got the alternator replaced a few weeks ago and when I got it back from the shop the idle would surge from 1k to 2k. I didn't think anything of it cause it would do it after the battery was unplugged but it would go away after a 15 minute drive or so. I expected it to go away but it didn't stop for a week. After it went away everything was fine until last Friday. I was driving to a friends house when all the sudden the car hesitated when I was accelerating and then it wouldn't idle at all. The RPMs would go up between shifts and when i rolled up to a stop light it would idle at 2k then sometimes raise up to 3k. I would have to drag the motor down by putting it in gear just so I wouldn't like an asshole at stoplights. I probably burned my clutch up by doing that but fuck.
I didn't drive the car for a few days after that until I took it to Rob at e30 Motorwerks yesterday. On the way there it didnt do it all which pissed me off cause I wanted him to see what was going on. We both checked it out, we couldn't find any vacuum leaks of any sort, or any problem for that matter. He gave me an AFM he had laying around and it calmed it down a little bit. But today I was driving and I was accelerating, not WOT but giving it some juice and then it hesitated a few times again. So I turned around and took my sisters car to where I was going.
Also the car has done this since I've gotten it but when I start it up it idles fine at around 700-800 RPMs but once I start driving and roll up to stop lights it stays at 1000 or 1200 RPMs. I haven't been able to figure it out.
What do you think is going on with this hesitation, fuel regulator? Sticking Vanos?
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