So I took may M60 E30 out for the local spring cruise and she wouldn't behave. I need help where to start diagnosing.
I drove the car for about 1 hr highway with no problem. The first red light I stop at it stalls out at idle. I thought it was ICV valve so I kept the revs up at every stop. After about 20 mins I have no power below 1000 RPMs, then no power below 1500 RPMs, this escalated until I had to drive in very low gear at above 4000 RPM to get up any grade. I eventually stalled the car at a red light and wouldn't start. I let it sit for 20 mins and then it drove just like until I parked it.
I left the car for 3 hrs and drove it again for 1 hr and it was fine but then it started again.
The car feels like it is not getting any fuel below that RPM, above the RPM it feels fine the throttle response is fine and there is plenty of power.
I was thinking there is something up with the TPS, or PCM is cutting fuel due to knock sensor signal. Maybe something is wrong with the fuel pressure regulator which is relatively new (fall last year). Maybe there is some crazy vacuum leak but the basic test of spraying throttle cleaner doesn't show anything,
Where should I start?
I drove the car for about 1 hr highway with no problem. The first red light I stop at it stalls out at idle. I thought it was ICV valve so I kept the revs up at every stop. After about 20 mins I have no power below 1000 RPMs, then no power below 1500 RPMs, this escalated until I had to drive in very low gear at above 4000 RPM to get up any grade. I eventually stalled the car at a red light and wouldn't start. I let it sit for 20 mins and then it drove just like until I parked it.
I left the car for 3 hrs and drove it again for 1 hr and it was fine but then it started again.
The car feels like it is not getting any fuel below that RPM, above the RPM it feels fine the throttle response is fine and there is plenty of power.
I was thinking there is something up with the TPS, or PCM is cutting fuel due to knock sensor signal. Maybe something is wrong with the fuel pressure regulator which is relatively new (fall last year). Maybe there is some crazy vacuum leak but the basic test of spraying throttle cleaner doesn't show anything,
Where should I start?
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