Hi guys, this is my first post here!

I've just got hold of an '87 Camaro IROC-Z, 305, 5-speed manual.

They're quite rare here in Ireland!

I will probably be back with many questions, but here's the first:

The throttle seems to stick open, especially when changing down. i.e. when declutching the revs stay up at 2500 - 3000 rpm. A blip of the pedal makes it drop down to tickover.

I can't make it happen when stationary, so its not possible to see if the linkage is sticking, but it seems to be free enough.

Any ideas please?

Thanks!

Andy
Kilkenny
Ireland.

 

check your floor mats i know it sounds stupid but they can get bunched up under the pedal, you can also hit the linkage with carb cleaner then some wd-40 after wards . Good Luck

 

idk but i had to ask if you are a southpark fan cause your name is awesome lol

 

When the throttle body is old , the holes the butterfly shafts run in wear out of round so when closing the butterflies can go off center and jam up in a open position.The tap on the pedal seats them closed.
Disconnect accelerator cable from TB and check to see if there is any forward / back movement where the shaft enters the TB.
A broken / kinked /damaged accelerator cable can have the same effect

 

That makes sense. I had a similar thing on a TVR I have, which has individual butterflies on each cylinder.

Each butterfly had a screw that held it onto the shaft. I was able to loosen these screws then 'flap' the butterflies a few times so they settled more centrally, then tighten the screws.

I wonder cold this be done in the Camaro - how do I get to the butterflies to see?

I just got this car, have no manual yet.

Thanks!

Andy.

 

the TB would have to come off to do that i believe , try shooting some WD-40 on the shaft and see if that frees that up a little .

 

Yea, I don't think its physically sticking though. I'll investigate the throttle spindle bearing thing.

I might take the TB off anyway to have a look!

Thanks for pointers guys..

Andy
Kilkenny
Ireland.

 

Well, happy days.

I squirted some easy-start (the can I bought is actually called 'Start You Bastard!') and heard no change in revs.

Took off the Throttle Body, the spindle feels ok, no undue play, but a lot of black sticky gunge around the butterflies. Cleaned that away with brake cleaner (alcohol), reassembled, took the car for a run and all seems fine!

One thing though, what are the thin plastic pipes that run from the back of the engine to the TB, and via a T-piece to the cruise control department for? Gee they are brittle, mine broke in a couple of places when I was moving stuff around. I assume vacuum. Would it be a good idea to replace these for something less brittle?

Andy
Kilkenny
Ireland.