rough running

15

Asked by May 31, 2014 at 05:30 PM about the 2000 Chevrolet Silverado 1500 LS Short Bed 4WD

Question type: Maintenance & Repair

put in ngk TR51x spark plugs iridium under my hood it says gap is .060 these plugs were gapped at . 040 i was told to leave them gapped at .040 . should i have changed the gap to .060 ? any help would be appreciated

15 Answers

104,235

They say according to the type of plug there is a gap difference. One type is .060 and the other is .040. Your gap is probably not your issue. Did all you plug wire snap on tight? Did you replace plug wires too? If so are they in correct order? Could you have accidentally unplugged something while changing them.

1 out of 1 people think this is helpful.
104,235

Platinum plugs are gapped at .060 (oem). Iridium plugs are an upgrade and should be gapped at .040.

2 out of 2 people think this is helpful.
83,205

This happened to me in my shop, customer brought in his own HGK plugs for a tune up, so I installed them with a tune up, during my road test it started missing, scoped it and found a bad plug pulled it out could not find anything physically wrong with the plug, installed another NGK plug in its place, done another road test, and it started missing again, scope showed another plug had failed on a different cylinder, I convinced the customer to install AC plugs back in it, he agreed installed all new AC plugs problem went away. So what I'm trying to say it could be the new spark plugs not just the gap.

3 out of 3 people think this is helpful.
104,235

Good point. TS

2 out of 2 people think this is helpful.
15

went and bought new wires according to the coil number. started up truck ran great. stopped to pick up some items truck ran rough. will be getting ac delco plugs tomorrow. i appreciate both of you people for helping will let u know how it goes. whay would be the best spark plug to use

83,205

This kinda old school but it seem to work: A/C is for GM vehicles, Ford products use autolite or motorcraft, European vehicles use Bosch, Asian use NGK or Denso. Hope this helped.

15

i bought new wires according to the number on my coils what plugs do you want me to try and also on the shroud it says .060 gap what gap do i use

83,205

If you get AC's they should already be set to factory setting of 60 but it never hurts to double check, and don't forget the anti seize.

15

plugs originally were autolite app605 at .060 should i order them or get iridium and use gap of .040

83,205

Autolite's in a Chevy? Get some AC's, double platinum, that should last you another 100,000 miles.

Best Answer
15

put in autolite wires and ac double plainium plugs. truck ran great shut it off after a run and it ran rough. let it sit overnite started great did my erran 25 miles away started truck again ran rough no power???????

1 out of 1 people think this is helpful.
83,205

OK That sounds like a vaporlocking or injection problem, try putting in a can of SeaFoam in the fuel tank that has a least 5 gallons of fuel in it, then check and make sure the fuel lines in the frame rail are away from any abnormal heat source ie exhaust pipes, converter. If that fails you could try getting some of the heat reflective wrap and wrap the fuel line in the engine compartment or anywhere it comes close to a heat source. Might try also using a tank of Chevron fuel if the above doesn't get it. I'm thinking that the fuel is boiling during the hot soak.

1 out of 1 people think this is helpful.
15

will try the sea foam today and check the fuel lines thank you

15

hi sorry it has been soooooo long in follow up tried a can a week of sea foam and it cleared the injectors right up you could actually feel when something went through. if anyone is having issues like i did go the sea foam route short money worth the shot tennisshoes very helpful cudos

83,205

Great news.

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