Question about Spark Plugs BR4HS Plug 10/BX #3322

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Chevrolet trailblazer 2004 4.2 spark plug gap

Gap

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.043

Posted on Sep 09, 2014

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P0300 random misfire. Have changed valve cover gasket set and intake manifold gasket set. Any more suggestions?


Have you checked the gap on your spark plugs and do you have coil packs or a distributor? In either case they could be bad or cracked.

Apr 08, 2016 | 2004 Chevrolet TrailBlazer

1 Answer

#3 cylinder not firing. changed sparkplug. as i accelerate the problem (shaking) seems to inprove. when going slow i have a bad shake in the trailblazer


It could be the spark plug wire, or the coil. 2004 model you should have coil over plug (C.O.P) setup. Also check for any signs for arcing around the spark plug boot area and around the coil. Any white or gray lines on the boot area or coil is an indication of arcing. If arcing is happening, the current will take a short cut to ground instead of jumping the gap at your spark plug, thus giving you a "no fire" situation. I also ways recommend replacing spark plugs in a set along with new wires. I don't recommend just changing one.

Sep 24, 2011 | 2004 Chevrolet TrailBlazer

1 Answer

What are the spark plugs gap for a 2004 chevrolet trailblazer?


Gap should be 0.043" and make sure to use AC Delco 43-103 exclusively. These are the OEM and work best in this vehicle.

Sep 04, 2011 | Chevrolet TrailBlazer Cars & Trucks

1 Answer

What is the gap setting for the spark plugs a 2004 trailblazer?


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.

Aug 23, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

Hi my friends Trailblazer won't start. We have ruled out the battery the starter the cylanioid and battery connections. Any ideas?


Now you need to check for spark. Pull a plug wire, and insert a loose plug in the disconnected wire. Crank the engine to see whether there is spark across that gap.

If there is, reconnect the plug wire, take the hoses or whatever off where the air goes in the engine (I am presuming this is fuel injected), and spray starter fluid in the throat, and see if the engine will show signs of life. If it does, you have a fuel problem.

Jun 25, 2010 | 2004 Chevrolet TrailBlazer

1 Answer

I changed spark plugs on my 2004 trailblazer but now it runs rough maybe missing one. Could the boots be bad


did you gap the spark plugs? Check all the boots and grease them with coil boot grease!!

May 23, 2010 | 2002 Chevrolet TrailBlazer

2 Answers

Spark Plug Gap settings


ACDELCO Part # 41103
SPARK PLUG .043 GAP

Feb 23, 2009 | 2006 Chevrolet Trailblazer

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