RPM stays high at a stop

[guy_geo]

When I come to a stop after drivinh normally, my RPM stays high )around 1800/2000 RPM).

No smog pump, all hoses are plugged, throttle limkage is ok and well lubed, PCV valva brand new..

I did put a carb treatment in the gas tank..

Can it explain that?

[Bruce Palmer]

Worn throttle shafts on Hitachis can exhibit that trait. Too much spring pressure can put the shafts in a bind. Or you might be missing a return spring or two. I have also seen foot peddle pivots inside the car so gummed up they wont move freely.

What carbs are you running?

If you tap the gas will the idle come down any?

[guy_geo]

Regular SU (4 bolts) square.

If I do tap the gas pedal, the idle return to the normal.. Just tired of people looking at me like I wanna race each time I come to a stop or traffic light...

[rdefabri]

I get the same thing.

What I do is slow the car in gear, until the engine is just under 1K RPM, then clutch. That usually does the trick.

I agree it's annoying. My Jag does the same thing at times, and it's either something in the carbs or throttle shafts as Bruce says.

[guy_geo]

OK, I'll try yo lube the throttle shafts tonight and clean the gas pedal grommets as well..

And I will see from tehre, and use rdefabri trick...!

[Bruce Palmer]

Unscrew the gas peddle from the fire wall and clean the little shaft it pivots on too. The bellows probably aren't an issue. A little white lithium grease at all the connectors (dogbone cups, pivots) all the way to the carbs certainly wont hurt anything.

My money's on binding worn shafts.

[sblake01]

That tip works on EFI cars too.

[guy_geo]

Where are these located

My money's on binding worn shafts????

Thanks all for the info!

[rdefabri]

I tried to grease the dogbone cups - nothing. The gas pedal trick is worth trying, but worn shafts seems logical.

[Bruce Palmer]

What do you mean "nothing" on the dogbone cups?

[rdefabri]

Didn't affect the high RPMs at stop. I greased them, still high revs (around 2000 - 2500 rpms, then slowly drops to about 1500). Pedal doesn't feel like it's sticking (I put my foot under it to lightly pull back).

[jtl260z]

Where are these located

My money's on binding worn shafts????

Thanks all for the info!

To prevent tapping the gas, I stick my foot under the gas pedal and pull up.