'91 NA 300zx: hesitation problems, erratic idle and stalling.
- Disconnected maf made no difference other than a slightly higher erratic idle.
- Cold ambient air makes the problem worse. (less than 5c)
- No air leaks found.
- PCV valves are pretty clean (replaced one with a new one).
- Throttle bodies cleaned.
- Touching the coolant temp sensor connector would increase revs, this was fixed by cleaning the connector.
- Hesitation mostly gone and in most cases car accelerates faster than it ever has in my ownership.
- Car no longer stalls and hesitation cure might be because of the warmer weather?
New discovery:
Car idles fine for 5 mins, then there is a loud electrical buzzing noise which appears to come from the back of the engine, when this happens the revs drop to 500 and the erratic idle kicks in for about a minute until the engine stabalises again. No loose connections found.
The problem happens randomly but can easily be recreated by switching from demister to auto (eco).
I cant pinpoint where the buzzing is coming from but i think all the idle control stuff is in that area, im assuming a loud buzzing would indicate a major problem? or does the unit usually make a noise?
Ok so heres an update:
'91 NA 300zx: hesitation problems, erratic idle and stalling.
- Disconnected maf made no difference other than a slightly higher erratic idle.
- Cold ambient air makes the problem worse. (less than 5c)
- No air leaks found.
- PCV valves are pretty clean (replaced one with a new one).
- Throttle bodies cleaned.
- Touching the coolant temp sensor connector would increase revs, this was fixed by cleaning the connector.
- Hesitation mostly gone and in most cases car accelerates faster than it ever has in my ownership.
- Car no longer stalls and hesitation cure might be because of the warmer weather?
New discovery:
Car idles fine for 5 mins, then there is a loud electrical buzzing noise which appears to come from the back of the engine, when this happens the revs drop to 500 and the erratic idle kicks in for about a minute until the engine stabalises again. No loose connections found.
The problem happens randomly but can easily be recreated by switching from demister to auto (eco).
I cant pinpoint where the buzzing is coming from but i think all the idle control stuff is in that area, im assuming a loud buzzing would indicate a major problem? or does the unit usually make a noise?