ZCar Forum banner

Status
Not open for further replies.
1 - 4 of 4 Posts

·
Registered
Joined
·
1,299 Posts
Discussion Starter #1
Purchased new 77 280Z W/ 31,000 miles. When pulling up to a stop light the engine RPM does not want to return to idle. I have compensated for this by putting the car in first gear and slightly releasing the clutch to force the engine to idle. Ths throttle Linkage is not sticking at all. Any suggestions ?
 

·
Registered
Joined
·
107,695 Posts
> Purchased new 77 280Z W/ 31,000 miles. When
> pulling up to a stop light the engine RPM
> does not want to return to idle. I have
> compensated for this by putting the car in
> first gear and slightly releasing the clutch
> to force the engine to idle. Ths
> throttle Linkage is not sticking at all. Any
> suggestions ?

check your idle air regulator and the bcdd under the throttle body. these parts will wear out and let extra air into the motor, increasing the idle speed.
 

·
Registered
Joined
·
787 Posts
It sounds like your bcdd. The bcdd is under and in the middle of the intake. It is probably out of adjustment.

> Purchased new 77 280Z W/ 31,000 miles. When
> pulling up to a stop light the engine RPM
> does not want to return to idle. I have
> compensated for this by putting the car in
> first gear and slightly releasing the clutch
> to force the engine to idle. Ths
> throttle Linkage is not sticking at all. Any
> suggestions ?
 

·
Registered
Joined
·
107,695 Posts
> Purchased new 77 280Z W/ 31,000 miles. When
> pulling up to a stop light the engine RPM
> does not want to return to idle. I have
> compensated for this by putting the car in
> first gear and slightly releasing the clutch
> to force the engine to idle. Ths
> throttle Linkage is not sticking at all. Any
> suggestions ?

I don't know if your car is equipped with a vac. control valve -it's locates on top of the intake manifold at an angle, with a hose connected to it. This valve makes sure that the vac in the intake does'nt get to high.
You can check it by pluging the hose and start the engine in idle - if the idle get slower when you put your finger on the valve it should be replaced. The only time that this valve should be in function is when you are engine braking.

Hope this will help

Brian Madsen
 
1 - 4 of 4 Posts
Status
Not open for further replies.
Top