Idle problem

A home for 1983–1989 300ZX owners!
fire90021
Posts: 1
Joined: Sat Mar 29, 2014 11:27 am
Car: 1984 Datsun 300zx Nissan VG30E

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I have a 1984 Datsun 300zx Nissan with a VG30E with a standard transmission. Just in the last month I have been having an idle problem after the engine get to operating temperature. When I cold start the car it will idle at about 1000 rpm but after it gets to about 120 degrees it is idle at 500 rpm and runs extremely rich. I have changed the MAF, throttle position switch,and checked for vacuum leeks. It still will idle at about 500 rpm, then after a couple minutes the motor will stall out.

My dad and I have tried just about everything that we can think of. So if anyone has some ideas please let me know.


G-E
Posts: 129
Joined: Thu Aug 09, 2012 1:28 pm
Car: 1. 1987 300zx Turbo-swap, SF interior, koni rallisport springs/struts, msa swaybars
2. 1997 Sebring coupe
3. 1987 300zx 2+2 becoming a caged racecar with RB swap...

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Download the factory service manual, and check the parts that have to do with cold start ... alternately crack the throttle open with the set screw and make it idle higher

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evildky
Posts: 14225
Joined: Sat Jan 31, 2004 9:23 pm
Car: 71 Datsun 240ZT
87 Nissan 300ZX N/A-T
06 Nissan 350Z GT
Toyota Tundra TRD RW
Location: Louisville, KY
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CHTS, if the car starts cold good but won't warm start or fuel fowls once warm it's likely the CHTS. If it's simply idle speed you might need to clean and adjust the ficv.


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