Misfire cylinders 1,2,3 and 4 1998 gmc 350

[amiel.herrick]

New to the forums. I have a 1998 gmc k2500 5.7l 350. Had a blown head gasket. Fixed the head gasket and now it misfires in cylinders 1,2,3,4. Replaced plugs, wires, distributor, injectors, fuel filter. I'm at a loss.

 

 

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[Astrius]

Check to make sure gap is correct on plugs? Believe it's 0.60.

[amiel.herrick]

They are all at 0.60. All ACDelco.

 

 

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[Astrius]

Sure your cables are connected properly? (below)

Firing Order: 1-8-4-3-6-5-7-2

 

Coil

6 5

4 3

2 7

8 1

 

8 7

6 5

4 3

2 1

Front of vehicle

 

 

Does it run rough at normal operating temp?

 

Any knocking/etc?

 

 

A bit more details would be useful.

[barry G]

if it steamed to the front, it may be bothered by the headgasket fail.

poppet ends on the injection.. something

this also may bring a cat code, o2 sensors fail eventually.

 

unique error, it is cool to be able to see it through computing.

[amiel.herrick]

It does have an intermittent knock. I've check all the cables and they are fine. It always has a rough idle but levels out at really high rpms.

 

There are no codes except for the p300. I replace the whole spider injector system and it stayed the same.

 

 

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