Messages

1

Engine + Driveline / Another M42 Idle Pezzle???

« on: October 14, 2011, 06:52:32 PM »

Transplanted an older M42 into my '93 318i. Everything plugged in fine except there was no boss on the block to attach the knock sensor - as a result, I get a 1225 code with the stomp test(knock sensor). Here is my problem - The car starts up immediately and idles steady for about 15 seconds, then starts idling very rough. If I try to drive the car it exacerbates the problem, no throttle response and idling at 400 rpm. as soon as the coolant temp passes 1/4 on the gauge, the car runs perfectly at all rpm's and idles steadily. I have cleaned the ICV, replaced the coolant temp sensor,checked for vacuum leaks as best I could. I am baffled, could the lack of signal from a knock sensor cause this? Any suggestions would be welcome.

Jay

2

Engine management / M42 Rough Idle Puzzle, ???

« on: October 13, 2011, 10:38:22 PM »

Transplanted an older M42 into my '93 318i.  Everything plugged in fine except there was no boss on the block to attach the knock sensor - as a result, I get a 1225 code with the stomp test(knock sensor).  Here is my problem - The car starts up immediately and idles steady for about 15 seconds, then starts idling very rough. If I try to drive the car it exacerbates the problem, no throttle response and idling at 400 rpm. as soon as the coolant temp passes 1/4 on the gauge, the car runs perfectly at all rpm's and idles steadily. I have cleaned the ICV, replaced the coolant temp sensor,checked for vacuum leaks as best I could. I am baffled, could the lack of signal from a knock sensor cause this? Any suggestions would be welcome.

Jay

3

Engine + Driveline / m42 compression test results

« on: July 28, 2011, 02:41:30 PM »

I bought a '93 318i cheap - owner said it was run hot.

Compression test results:

1-80
2-30
3-25
4-120

Anyone hazard a guess at the damage?