Question about 1985 Chevrolet Suburban

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85 suburban 454. Misses when idle and gets worse when given foot feed??

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Sounds like ing like crack in distrubtor cap or shorte coil need a little more info

Posted on Nov 22, 2014

  • Brandon Woods Nov 22, 2014

    It ran fine when parked. Sit about 2 months and now it misses when idle and gets worse when given gas.



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When cold my '93 suburban dies but once warm runs fine it has a 454 with tbi

Have you checked to be sure the idle air control is working properly and also the engine temp control sw. The iac only comes on to maintain the idle when the engine is cold. The ect sw monitors the outside temp and tells the computer how much fuel to put to the engine. Hope this helps.

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Ive got a 2 wheel drive 85 gmc suburban 3/4ton with 454 and turbo 400. when i baught it there was a noise comin from tranny but only in first gear. it had no problems with shifting till i moved and towed a...

you can try flushing it using Seafome and replace your filter and fluid adding some trans tune with the new oil can git this things from most part stores . Hope this helps.

May 03, 2010 | 1985 GMC Suburban

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My engine occasionally misses and a rough idle

My 1993 caprice had the same issue.
Would it happen to down shift out of overdrive on the slitest incline.
if so, one of your plugs is missing under load. Mine turned out to be a wire.

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How do i Adjust the valves on my 85 Chevy 5.4L 454 ?

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Sep 21, 2009 | 1985 Chevrolet C3500

1 Answer

I have a 1994 suburban with 454 it idles fast and consumes way more gas than it should like 7mpg i have done complete tune up replaced throttle body gasket and there are no vacuum leaks i have also checked...

You said you did tune up which I am assuming you changed the plug wires and plugs so her are some other ideas.
Ensure that the fuel pressure is correct in all speed ranges.
Make sure TP sensor is not binding or sticking, Voltage should increase as you increase the foot feed towards wide open throttle.
Check MAP sensor response and accurcy.
Check EGR Valve for proper operatrion
Check canister purge system for proper operation
I have some more tests you can run that are in one of my repair books if you want them send me your email and you can check the high idle of your engine.

Sep 15, 2009 | Chevrolet Suburban 2500 Cars & Trucks

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Ignition timing specs for a 1986 Chevy 454?

Automatic I presume. 8 degrees BTDC @ warm & 700 RPM.
distributor vacuum off & plugged. In drive, & accessories off.
Don't forget parking brake on.

Jul 16, 2009 | 1986 Chevrolet Chevy

1 Answer

85 corolla stalling when idling

i had this happen to me the cause for me was that the shafts on the ends of my spark plug cables were cracked i hope this helps

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