Question about 1993 Pontiac Grand Prix

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Just changed spark plugs and gapped them at specs now car runs like its missing the plugs i took out were gapped at .060 but the book says gap at .045 what should i do

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Make sure you did not close any of the gaps on the plugs completely. Make sure you did not swap wires. Worst case scenario may have a bad plug. Hopefully you didn't drop anything in the cylinder hole when changing the plugs.

Posted on Sep 06, 2010

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1 Answer

Spark plug gap for 2003 chevy malibu l 3.1 liter


Your owners manual shows .060 spark plug gap.
Different spark plug manufacturers may list different gap specs.
If you don't have an owners manual you can read it online.
my.gm.com

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Went to change spark plugs and when i put the new ones in the car run's rough. put the old one's back in runs fine. did this twice .


Did you check specs to set the gap on the plugs to the proper setting for you vehicle They do not come set for all vehicles Some are at .030 and can be as high as .060

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as the system uses very high voltage ( 50 k to 65k volts) the plug gap pretty much is immaterial
The engine will run at both gaps listed and the problems that are likely to be encountered at at very high rpm
The gaps may start to falter from incorrect air fuel mixture as the lower gap may tend to short out in a rich mixture and the wide gap will miss if the mixture is too lean
Personally around the .055 " is a good compromise
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If you opt for the more expensive plugs( patinium ) then they will be the last plugs you will buy
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I have been told by mechanics and 2 auto stores that the gap should be .043. I don't know where people are getting .060. but my plugs are .043 and my trailblazer does not misfire or run poorly. Also, check the gap always, even if it's pre gapped because the handling of spark plugs could cause a change in gap. IE the plug bouncing in the box, vibration, etc.

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2000 Chevrolet Truck S10 P/U 4WD 4.3L SFI 6cylSPARK PLUG ASM
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Hope helps (remember to rate this answer).

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It is normal for the electrodes to wear as the plugs age. This increases the distance between the electrodes which in turn leads to a gradual increase in the firing voltage required to jump the gap. The gap on a standard spark plug grows about 0.00063 to 0.000126 inch for every 1,000 miles of normal driving, which means the firing voltage requirements creep up about 500 volts for every 10,000 to 15,000 miles of driving.

The OE Champion plug gap specifications are .048 - .053" or 1.24 - 1.37mm. in accessing and changing the plugs on the PT. They have the same gap specifications as the OE plugs. Most owners gap at .050. We prefer to use the Champion Double Platinum plugs, which are more durable, provide extended plug life, and reduce the need for maintenance, given the difficulty However, if you experienced excessive rough idle with your last set of plugs we suggest gaping the OE and DP plugs to .042 and consider replacing the OE plug ignition wires.

Excessive gap can cause performance and drive ability problems, including hard starting, an engine miss and or hesitation under load, and can shorten the life of the plug (accelerated tip erosion). If it were me I would re-gap them to the correct specs if they are currently gaped at .060.

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