HELP Engine won't idle. - Nissan Forum

 
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#1 Old Oct 4th, 2005, 03:01 PM
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HELP Engine won't idle.

I have a 1987 pathfinder (6 cyl 3.0 fuel injected)
Has never idled properly even after engine was replaced same problem resurfaced. Runs rich, have to constantly rev engine to keep it from stalling runs fine when under load except when idling. Any Ideas?
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#2 Old Oct 4th, 2005, 03:35 PM
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Quote:
Originally Posted by canorous
I have a 1987 pathfinder (6 cyl 3.0 fuel injected)
Has never idled properly even after engine was replaced same problem resurfaced. Runs rich, have to constantly rev engine to keep it from stalling runs fine when under load except when idling. Any Ideas?
MAF, TP sensors or connectors. My '92 would idle down to 100-150 RPMS (didn't know a engine could stay running that slow). Turned out to be the connector on the harness to the MAF. I took a tiny screw driver and reformed the stationary side (not the rolled tension side) of the female connector so it would get a good contact and it's been running great since. Also had a similar problem with the TB connector. This caused an erratic (surging) idle. I suspect a bad sensor could do the same.

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#3 Old Oct 9th, 2005, 02:38 AM
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Most of the '87's have an adjustment for idle mixture on the back of the ECU. A Chilton's manual should have the info on how to tune it.

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#4 Old Oct 9th, 2005, 06:04 AM
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There are some nice guides on cleaning your MAF sensor, but as said above, its probably a bad sensor.

97 Pathfinder 3.3 | Standard everything.
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