Just recently noticed that my '86 N/A suddenly has much less low end power.
I'm not 100% sure if it's actually a low end power issue, or some sort of fuel related problem.. Here's what happens:

From a stopped position, if i put the pedal to the floor, she sort of.. hesitates.
It accelerates relatively slowly to about 2000rpm, before she really goes.

Also, If i'm rolling in 1st gear at about 3000rpm, and then punch it, i'm pushed back in my seat as normal.

My exhaust is all stock, at the moment. So it's not the typical low end power loss related to the aux. ports. I don't think.


Don't get me wrong, I think i am making this out to sound like a much more serious problem than it actually is. In normal driving, she's fine - It's just when im not moving, and then punch it, she hesitates slightly.

Any thoughts or input would be apreciated.

 

the aux ports could be stuck in the high rpm mode, and that will result in a noticable loss of low end torque

 

What would cause that? carbonation?

and is there a quick way to check?

 

Look in the engine bay - if the aux port actuators are pushed in, then they are open (in high rpm mode). They are by the LIM on the pass side.

 

That's a picture of the ports in the closed (low RPM) position. If the rod is pushed in and the actuator rotated, they're stuck in the open (high RPM) position. It definitely does cause a noticeable lack of low end torque, despite what some people claim.

Also, if you're at low to mid RPM, and suddenly go to wide open throttle, a bit of a stumble or hesistation is normal. As near as I can tell (from SAFC-II readings), the airflow meter door gets yanked open, and overshoots. Combine this with the rapidly fluctuating airflow velocity in the runners as everything "gets up to speed", and you end up with a temporary pig-rich condition (moreso than usual) - airflow door overshooting plus odd airflow. You need to be smooth with the throttle.

-=Russ=-

 

thanks, that was helpful