Throttle sensitive

T.Hanson · Post by **T.Hanson** » Thu May 06, 2010 2:31 pm

What are possible causes of throttle being jerky sensitive ?

Unplugged the low end switch. It slows down nicer. I swear it is set to click off at the last possible instant.

Lags, stumbles just a bit before accelerating. If reving to say, 2000 just sitting still, it backfires some into the exhaust system.

Idles at 850, I swear it's timed right, plugs are new, wires good, etc.

What else ? Bad O2 sensor ? Old AFM or set wrong ?

Aggravating because my '79 runs smooth, strong, so I know something is goofy.

Lenny D. · Post by **Lenny D.** » Fri May 07, 2010 1:49 pm

If you have identical everything, try swapping components (one at a time). I would start with the AFM, I bet you will be surprised.

T.Hanson · Post by **T.Hanson** » Fri May 07, 2010 2:10 pm

Thank you. I was beginning to think I'd been ex communicated.

YouTube · Post by **Peter Florance** » Mon May 10, 2010 5:00 am

I think the fuel cut-off rpm values are different from the 79 to the 81.

T.Hanson · Post by **T.Hanson** » Mon May 10, 2010 12:24 pm

So ? Then what.

The '79 (spare) AFM had the same serial # as the '81. I swapped it in, no big difference.

All I'm reporting is, after everything from replacing the pedal bushings to engine swap for 56,000 block, total clean up, fuel regulator, two pumps, blah blah,...

If I diddle the gas pedal the engine will surge, jerk, bounce off the guibo right now. Boing, boing boing. The '79 is normal, to mean smoother, not a noticeable deal at all.

O2 sensor next.

Just for fun, the in tank pump I replaced for buzzing, there's still buzzing. I know the old pump was making noise, now to find out it was a duet from a speaker or seat or what.