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280zx rb20 idle problems


tylerd280zx

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I swapped a rb20det in my 1982 Datsun 280zx. Starts drives just has an idle issue. It will idle at a thousand rpms for 20 sec or so then it will drop down and wanna die sometimes it does. If it doesn't it will after 10 to 15 seconds it will kick back up and just start all over again any help would be awsome

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Tyler,

 

Idle on the RB is controlled by the idle air control motor. I had a similar situation. The idle air control motor pintle was dirty and everything moved slowly. This caused my idle to come down slowly and occasionally the motor would quit. Cleaning mine with throttle body cleaner did the trick.

 

If the problem is idle I would troubleshoot that system first. Hope this helps.

 

Pete

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I did away with a few things and added a few hope the pic is clear enough to see mostly what I've done..

.

Since the pic I added a fpr....due to my plugs showing really lean. I took it down the road feels sluggish and like I hit a wall at 4k plus I have the idle problem....checked for codes and shows 55 all is OK. I'll check the IAC motor pintle.

post-49789-0-05300500-1433825087_thumb.jpg

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So I cleaned the IAC and still nothing....car has a hesitation when giving it the throttle. Only at idle once its up in the rpms a little its fine .also when its at idle and you give it the throttle it sounds like the intake makes a odd sucking noise. the hesitation is just for a second or two the will rev like normal thru the higher rpms

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Tyler,

 

I have an RB25. One time we were messing around with my engine and unplugged the vacuum line from the FPR and then like idiots forgot to plug it back in before running the car. With that vacuum leak, the car idled at 1000 and there was distinct sucking sound under throttle. If the IAC turns out to be fine you might want to start looking around for an unplugged or damaged vacuum line.

 

Bill 

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