I have an OBD1 converted M52B28 in my e30, and it runs great most of the time...however...
When I start the car every now and then it smells like fuel but idles fine. I have no cats but this is a new occurrence as of two days ago. Coolant temp sensor is a brand new bosch unit.
Once it hits operating temperature, if I am moving and either push the clutch pedal in or put it in neutral when coasting to a stop the idle surges from about 500-1000. Once I come to a complete stop, however, it recovers and settles where it should be. Only when I'm coasting at operating temp does it do this.
Lastly, its down on power sometimes. One time I'll accelerate to full throttle in first gear and it will spin like crazy, slam second and it walks sideways, other times I'll get on it and it runs smooth but seems way down on power to the point it won't spin at all...hell it won't even chirp second.
All vacuum lines and gaskets are new. I am throwing a code for MAF and O2 even though I've tried three different MAFs and two o2 sensors.
There's no vac leaks from what I can tell. When its cold its fine...all this is only once it hits operating temp, except for the fuel smell issue which just started the other day.
The thing that gets me the most about this is this started happening and has progressively gotten worse. When I first finished the swap it ran great all the time...but this is becoming more common of an issue with it. Sometimes when I hit vanos it bucks even...not all the time, but sometimes. And high RPM in 4th it falls on its face, I get more pull shifting to 5th and accelerating. I have 3.91 gears so that's normal highway speed there.
And if you drive the car lightly, like a normal person, you can drive it all over and it will never act up. Its only under hard throttle.
Thoughts, opinions?
As I said, it is an M52B28 with M50 intake, harness, sensors, and 413 DME, no tune.
BTW, I'm still getting an average of about 23-25mpg with it running like this, so, idk.
When I start the car every now and then it smells like fuel but idles fine. I have no cats but this is a new occurrence as of two days ago. Coolant temp sensor is a brand new bosch unit.
Once it hits operating temperature, if I am moving and either push the clutch pedal in or put it in neutral when coasting to a stop the idle surges from about 500-1000. Once I come to a complete stop, however, it recovers and settles where it should be. Only when I'm coasting at operating temp does it do this.
Lastly, its down on power sometimes. One time I'll accelerate to full throttle in first gear and it will spin like crazy, slam second and it walks sideways, other times I'll get on it and it runs smooth but seems way down on power to the point it won't spin at all...hell it won't even chirp second.
All vacuum lines and gaskets are new. I am throwing a code for MAF and O2 even though I've tried three different MAFs and two o2 sensors.
There's no vac leaks from what I can tell. When its cold its fine...all this is only once it hits operating temp, except for the fuel smell issue which just started the other day.
The thing that gets me the most about this is this started happening and has progressively gotten worse. When I first finished the swap it ran great all the time...but this is becoming more common of an issue with it. Sometimes when I hit vanos it bucks even...not all the time, but sometimes. And high RPM in 4th it falls on its face, I get more pull shifting to 5th and accelerating. I have 3.91 gears so that's normal highway speed there.
And if you drive the car lightly, like a normal person, you can drive it all over and it will never act up. Its only under hard throttle.
Thoughts, opinions?
As I said, it is an M52B28 with M50 intake, harness, sensors, and 413 DME, no tune.
BTW, I'm still getting an average of about 23-25mpg with it running like this, so, idk.
Comment