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jerryk · 02-01-2008, 02:17 PM

I own two 1990 240sx. Both are on the road. I have a fluctuating idle problem with one of them with 177K on the engine. It is scheduled to be my final car. I know what the idle is supposed to be a bit above 730 because my other one with 220K has a perfect idle. The fluctuating /hunting idle goes between 780 and 950 when warmed up or at a stop. Sometime it fluctuates worse then others but it never goes below780 and is always moving. I just made a trip to PA and the road mileage is, I swear 31MPG, but in the city, it ranges between 21 and 23, which is costly these days. The other car gets 25MPG in the city and 30MPG on highway. I have both cars at a mechanic and he has been swapping parts.

Air regulator
AICV
MAF meter
EGR valve

I would appreciate any ideas.

02-01-2008, 02:17 PM	#1
jerryk Leaky Injector Join Date: Sep 2006 Location: Island Park NY Age: 84 Posts: 93 Trader Rating: (0)	1990 240SX fluctuating idle problem I own two 1990 240sx. Both are on the road. I have a fluctuating idle problem with one of them with 177K on the engine. It is scheduled to be my final car. I know what the idle is supposed to be a bit above 730 because my other one with 220K has a perfect idle. The fluctuating /hunting idle goes between 780 and 950 when warmed up or at a stop. Sometime it fluctuates worse then others but it never goes below780 and is always moving. I just made a trip to PA and the road mileage is, I swear 31MPG, but in the city, it ranges between 21 and 23, which is costly these days. The other car gets 25MPG in the city and 30MPG on highway. I have both cars at a mechanic and he has been swapping parts. Air regulator AICV MAF meter EGR valve I would appreciate any ideas. Last edited by jerryk; 02-02-2008 at 03:56 AM..