abdo

I took the my '86 coupe out today after the long winter's hybernation.
It started fine but stumbled badly on initial acceleration. At higher RPMs it seemed to run smooth and strong. I sprayed some cleaner in the air intake plenum and it runs better but still has a little hesitation at first acceleration. I thought of putting a can of Seafoam in the tank when I take it out for a drive next time. I have replaced the spark plugs about 3 years ago. I pulled one and it looked fine other than the gap was a little too big. Any suggestions from those of you who have early L98 engines?

Muffin

Check your TPS. Long explanation made short: On acceleration the TPS causes an action something like the accelerator pump in a carb. The ECM sees a rapid opening and knows the engine will need more power soon so it immediately increases fuel to the cylinders, (carb accelerator pump). No extra fuel=hesitation/bog on acceleration. Your FSM will tell you how to do the checks and settings.

abdo

Thanks, Muffin, I will do that when I get it out next time. I do have a FSM and I checked the Throttle Position Sensor a few years ago. It was right on then. The coupe has almost 90 K on it now so I know it could be off a little.

abdo

I decided to check the TPS right away. It was .51 volts, well within the range specified. I still think it may be a little carbon in the intake or else a dirty injector.