2008 Chevrolet Truck engine

2008 CHEVROLET TRUCK
130,000 MILES
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KENNYGEEMI
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  • 2 POSTS
miss fire on # 7, changed plug, wire, coil and injector no change. When the problem first started it would miss and then stop for a while.The last time I drove 250 mile with no problem then it started again had hasn't stopped. I took off the valve cover and #7 intake valve doesn't move or operate at all
Oct 10, 2013 at 6:12 AM
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
  • 48,601 POSTS
check for a broken or bent pushrod or a bad lifter. It cold be a cam as well but kind of doubt it.
Oct 10, 2013 at 7:45 AM
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KENNYGEEMI
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  • 2 POSTS
Good lifter no broken or bent push rod. As I said the problem comes and goes push rod do not fix themselves. Upon reading info about the 5.3 chevy engines #7 is one of the cylinders that can be shut down by the computer for better highway mileage. This is done by bypassing the oil to the intake lifter. This is a more probable cause I think, a bad solenoid.
Oct 11, 2013 at 11:32 AM
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HMAC300
  • AUTOMOTIVE REPAIR CONTRIBUTOR
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it doesn it electronically not taking oil away try cleaning your maf and see what happens. Misfires arenot easy to find even for apro. check fuel pressure with a gauge as well. shold be 50-60psi engine off key on
Oct 11, 2013 at 12:19 PM