dtmpower

So I picked up a 87 Turbo yesterday and I freaking love it although it has these pesky issues. Ive searched and read about the Idle being too high and I am going to change all the vaccum lines and see what happens. BUT what really got me worried is when the car is moving and I depress the clutch to shift up or down the revs stay up there hanging until I let the clutch go!...what could be causing this??...I was thinking over boost??..but then again its bone stock with the exception of a K&N filter...any help would be appreciated, thanks in advance.


By dtmkarnage at 2011-07-01

tonsoffun300zx

check your air idle control its on the right side of the manifold if you're looking at the car from the front, it's a little thingy that has a screw to adjust the idle (excuse my use of the word thingy idk how to explain what it looks like) and it should be in the middle og the mani on the right side.

dtmpower

Thank you I will get right on that. Would this be the problem with the rev hang im experiencing also??

tonsoffun300zx

may be it is the air IDLE CONTROL valve so try with that and what does your car idle at my 88 turboidles at 700rpm all day every day! and when i got it it idles at 12000 rpm all it needed was the adjustment but be careful not to strip or over tighten the set screw.

omniserv

Get a FSM and trace down every source of air that can get into the intake. Could your throttle cable be sticking?

dtmpower

My car idles at about 1000-1200rpm and when I shift..I shift at about 2000RPM, clutch in and rpm stays there or goes a little higher until I let the clutch go again. how can this be an idle issue??

dtmpower

Nope I dont think thats the case..I tried turning the throttle by hand under the hood and it doesnt stick..but rpm's act the same.

dtmpower

I tried to turn the idle screw clockwise but it was already fully turned.

idle

2 connectors that were not plugged in..are these extra connectors?

omniserv

I order for any engine to run at all it needs air. If your RPM's are high or not returning to idle air has to be getting into the take some how. Track down every source of air. You can temporarily remove and plug lines from things like the FICD etc until you effect a change.

Keep in mind that because you are not saying it runs like **** chances are the air that is getting in must be going through the AFM otherwise it would just run bad like if you took a vacuum line off. I'd start with the hose going to the AAC/FICD. Pull it and plug both ends and drive it.

Even if the ECU was dumping to much gas into the cylinders the engine would not race, it would just flood and die. It needs air.

One of those connectors looks like a O2 sensor and the other might be a throttle position . I'd have to go look at our car to be sure.

dtmpower

Thanks for the info. I have no CEL so I dont think the O2 sensor is unplugged and the TPS is plugged in also. Ill check all those lines tomorrow.