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Low idle issues

Kingman

By Kingman,
in 86.5-89 WD21 Pathfinders

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Kingman NPORA Old-Timer

Kingman

Posted
Posted

About 3 months ago, my '87 pathy started idling low, about 400rpm in drive, when its fully warmed up. It is actually the norm now, I noticed however, that rarely it will idle normally about about 700rpm.

 

Also other times, it will idle normally, and then suddenly drop down to about 400 or so. Then on the very, very rare occasion, pop back up to 700rpm. Only done that about twice, though.

 

I'm just wondering if I should start replacing sensors or what...

I adjusted the idle to cope with that, but sort of forgot what would happen when it was totally cold in the mornings, where it would start up at 2,000 rpm. Oops. I tuned it back down after that.

 

Another thing, it seems that if it's idling low, I can turn on the rear defrost and it will idle normally. ehh?

Is that just engine raising rpms to cope with the added power needed for the rear defrost?

 

But it's not acting like low fuel pressure, or anything like that. It still idles smoothly, no matter what.l Just low, or normal

 

Ideas?

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Alkorahil NPORA Old-Timer

Alkorahil

Posted
Posted
About 3 months ago, my '87 pathy started idling low, about 400rpm in drive, when its fully warmed up. It is actually the norm now, I noticed however, that rarely it will idle normally about about 700rpm.

 

Also other times, it will idle normally, and then suddenly drop down to about 400 or so. Then on the very, very rare occasion, pop back up to 700rpm. Only done that about twice, though.

 

I'm just wondering if I should start replacing sensors or what...

I adjusted the idle to cope with that, but sort of forgot what would happen when it was totally cold in the mornings, where it would start up at 2,000 rpm. Oops. I tuned it back down after that.

 

Another thing, it seems that if it's idling low, I can turn on the rear defrost and it will idle normally. ehh?

Is that just engine raising rpms to cope with the added power needed for the rear defrost?

 

But it's not acting like low fuel pressure, or anything like that. It still idles smoothly, no matter what.l Just low, or normal

 

Ideas?

 

 

Temp sensor?

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