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
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
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
  • MEMBER
  • 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
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
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
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