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Old 02-11-2004, 12:14 PM   #1
oleblue72
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Question puzzled?

Engine is missing or sounds an acts like a burnt valve? Compression test shows 120 all cylinders, timing is good, plugs good, new plug wires, seems to smoth out after take off? I hear a popping noise when taking off too, sounds like it's coming from exhaust system. Vacuum gauge shows a constant bounce between 15-20 at idle. I removed intake, installed new gaskets cking for a good seal with a scope all ok. Vacuum gauge still bounces and still missing. Any suggestions?
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Old 02-11-2004, 01:24 PM   #2
JimKshortstep4x4
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I would be looking for a broken valve spring or a worn cam lobe.

Jim
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Old 02-11-2004, 02:33 PM   #3
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i'd recheck the plug wires for good contact in the cap as well as on the plugs
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Old 02-11-2004, 02:53 PM   #4
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I remember not to long ago someone else was complaining about popping out of exhaust, turns out he had a busted Valve spring.

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Old 02-11-2004, 03:56 PM   #5
67chevemall
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Carb Adj???
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Old 02-11-2004, 06:00 PM   #6
cwilli84
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I'd go withthe bad valve spring too, since I just had this happen to me about 3 -4 months ago. Replaced the bad spring and pushrod that was bent , and everything seems good no backfire or misses.
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Old 02-14-2004, 08:29 PM   #7
oleblue72
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Sorry for taking so long to reply, been working alot. I think I'll ck the valve springs. Thanks for all the replies. I'll let ya'll know what I find.
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1997 Dodge 1500 5.9L
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2002 Mitsubishi Montero 3.0L
2005 Ford Escape 3.0L

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Old 02-14-2004, 08:30 PM   #8
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Don't forget to check exhaust manifold for cracks.
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