Camaro_Boy

it seems to have a really crazy problem... the idle is now reving at around 4000 all the time.. doesn;t go down.... also.. the overheating ... i have played wit this car and tried to make the overheating work.. the last resort is a switch but i really dont want it... any hints please? i just got 2 new tempature sending units from a scrapers to test that out.. anything else guys? thanks for all the help

app it


Regards

Douglas

TheGreatJ

Sounds like a real nasty vacuum leak to me, like maybe an unhooked brake booster hose or PCV hose. There's not much else that'll make an EFI car idle that high (other than putting a brick on the gas pedal.)


A bad vac. leak will also cause the car to run lean, which can lead to overheating. Fix the RPM issue first, then sort out the temp. problem.

Camaro_Boy

i just replaced the pcv valve and it was running fine... amybe i pulled out a wire somehwere... ill go check again

thanks

Douglas

respectirocz

86 camaro? efi?

is this car fuel injected?
if so check the idle air control valve
if its carburated, check the fst idle cam on your rochester qudrajet, but even then i cant imagine 4000 rpms

the 86 camaro had 5 engine options

a 2.5l inline 4 throttle body injection
a2.8 v6 multiport fuel injection
305 v8 quadrajet carb
305 ho v8 quadrajet carb and finally
305 v8 tuned port injection

so the more info u can give us the better

Tru2Chevy

Sorry, but that's not all right....

2.8 MPFI
5.0 carb
5.0 carb HO
5.0 TPI
5.7 TPI (in a small number of IROCs)

But we do still need more info.....

- Justin

Camaro_Boy

5.0 carb,

respectirocz

the 86 camaro was offered with a 4banger, though very rare
and i dont believe the 5.7 was offered this year, i'll check my information again, its pretty reliable but i could easily have misread

respectirocz

i stand corrected, a total of 50 camaros were produced in 86 with a 350 engine,

more than likely the same number of camaros in 86 had the 4 banger

Rice Killer87

can u hear a "sucking" sound w/ it running and the hood up??

sounds like a big vacuum leak to me as well.

the throttle isnt stuck is it?

RealDealZ28

My car does the exact same thing. It's an '88 with the 2.8 MPFI, and when it's running, it idles straight up to 4000 and stays there. I'm wondering if maybe something killed the computer (the car has been sitting since '93), since my check engine light comes on immediately during startup. I haven't found any vacuum leaks or anything unplugged.

Camaro_Boy

thanks for everything boys.. i do beleive its a vacuum leak.. tho i cant find it cause the engine is going crazy at 4 grand and so ive decided to take it and get repaired.. at a shop... ive tried for over a year to try to fix it up... no luck and im soo busy so... thanks again boys app it


regards

Douglas

Rice Killer87

i cant remember for sure,but i thought i heard of a code for the computer going bad/takin a ****.

use a paper clip to connect the 2 top right spaces in the ALDL connector and see what she reads and let us know.

RealDealZ28

I'm actually pretty sure my computer's fried. My dad's a professional mechanic, and when I tried to scan it for codes, the scanner never even received a signal from the computer.

TheGreatJ

That's a pretty good sign, although a loose ground or wire to the ALDL or the ECM itself could cause the same problem. Check your grounds and fuses before you condemn the ECM.

Marc 85Z28

Carbed, fuel injected, doesn't matter. A bad ECM will not cause an engine to run at 4000rpm with the throttle closed. You need air, and a lot of it to spin even a V6 at 4000rpm.

Camaro_Boy, don't bother inspecting any of the small vacuum hoses for leaks, or worrying about the choke. Chances are you've got a completely disconnected hose somewhere, and a large one at that. Another common culprit would be a leak at the carb base. A deteriorated carb base gasket, loose or overtorqued carb bolts, or a combination of any would cause this.