any feedback
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New User
Joined: Aug 2009
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any feedback
have 99 7.3, missfire cyl. 8, no eng. lamp, contribution test fingers cyl8, injector harness and valve cover gasket replaced about 8k ago, perform comp. test and cyl. 8 only 150psi, when oil added to cyl. comp. returns to better than 400 psi, any ideas
Posting Guru
Joined: Jul 2004
Posts: 1,777
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From: Buckingham, IA
Sounds like it could be a broken compression ring or a loose injector. Pull the valve cover and check no. 8 injector to see if it has come loose. Or the copper washer at the tip could have gone away. Those would be easy fixes. Have the injectors been removed recently? Others will be along with other ideas.
By the way, welcome to FTE!
By the way, welcome to FTE!
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New User
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the cyl. 8 injector was replaced about 8k ago, by previous owner by private shop, harness and valve cover also replaced. no chip or tuner, 250 k on truck, from what i here pretty uncommon for compression concern?
Post Fiend
Joined: Mar 2007
Posts: 26,966
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From: Texas
Smoke out the oil fill cap isn't too much of a cause of concern, extremely low compression numbers would have me worried. If you remove the oil fill cap and start the truck, what does the blow by look like? Smoke is no problem. Puffing is bad. If you flip the oil cap upside down and it gets blown off the tube, that's bad. If it just vibrates off the tube, no worries.
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do you think if the injector is leaking and washed cyl. that compresion will return with new injector
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New User
Joined: Aug 2009
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put a new injector and compression not strong enough to fire well enough, still smoking and dumping fuel out exhaust, replacing engine this week coming. ill probably rebuild the engine after i pull it, engines are quite exspensive.
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