Question about 1989 Chevrolet C/K 2500

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Got a chevrolet pick up 1989 year 5.7L engine,it

I have a chevrolet pick up 1989 year 5.7L engine,it was it running rough when it idle,my mechanic check that no# 2,8,5,3 is missing,we replace all spark plug,spark wire,distributor cap and rotor,check all compression is 150psi,we replace inlet manifold gasket and check for vaccum leak but still the same

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Posted on May 29, 2010


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1989 chevy blazer full size rough idle

Check the CO/Temp sensor in the exhaust manifold. It may tell the ECU that the engine is hot when it is cold or cold when hot, getting the mixture wrong.

Mar 25, 2014 | 1990 Chevrolet K2500

1 Answer

Won't downshift when passing

Sounds like you have two problems, rough idle from an 89 would indicate mutliple problem possiblilities. Spark plugs, timing chain, injectors, coil pack, vacuum hose corrosion. Start there and if that doesnt solve the idle issue its time for a mechanic or a trade in.

For the no downshift, slow down lol. It could be an out of spec throttle cable. Check to make sure the cables are free and clear of debris and no kinks are present. The throttle linkage should move freely while the engine is off and again while running, be careful here.

Unfortunatly we may have to face the truth the old girl just doesnt have it in her anymore. Take it slow and easy, shes earned it.

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5.3 liter Chevy engine #1 Cylinder not firing at idle

My opinion...

Year? Miles?

There's no way I'd dive into a "HEAD GASKET"
diagnosis without pressure testing the cooling
system and (wet/dry) COMPRESSION testing
the whole engine...

Even if it is a "HEAD GASKET"... the entire engine
might be ready for a REFRESH... and tossing a new
Head gasket into a TIRED ENGINE not insubstantial
(a lot of wasted time & money)...

Come back with some compression numbers...

but don't bother with any of this if your engine oil has water in it.

(in my opinion)

Carnac the Magnificent

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If you have had the battery unhooked or the battery went dead then you will need to take it into a shop and have the minimum idle relearned. The prom is inside the Engine Control Computer (ECM), I doubt that that is the problem though.

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you have done your home work, go to the egr system, and fuel pressure,

May 29, 2010 | 1989 Chevrolet C/K 2500

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YOUR problem is the carby acc pump and idle jet ...... what you need to do is remove airfilter and take the top off the carby and you should see a small ball and spring under gasket ...when you open the throttle it will pump petrol to the small pick up jet and the other jet will take over ...clean out carby jets and rebuild and that should be ok

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