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littlelo
New User
Sep 24, 2011, 2:23 PM
Post #1 of 7
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i have a 2003 mitsubishi outlander 205,000 miles i changed the headgasket and the vehicle runs well shifts well but everytime i give it gas the valves rattle loudly,could it be that i didnt change the headbolts when i put the thing back together
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Hammer Time
Ultimate Carjunky
/ Moderator
Sep 24, 2011, 6:34 PM
Post #2 of 7
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Re: rattling valves
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Not changing the head bolts may cause you to have to do the job all over again but it's not causing the rattling. That sounds like an oil pressure issue. It's very risky doing the head on a car with that much mileage.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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re-tired
Veteran
/ Moderator
Sep 24, 2011, 7:25 PM
Post #3 of 7
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Re: rattling valves
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I sure they milled the heads during the job. This would increase the compression which may induce spark knock. Try backing up your timing a few degrees and see if it helpps.
LIFE'S SHORT GO FISH
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Hammer Time
Ultimate Carjunky
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Sep 24, 2011, 8:26 PM
Post #4 of 7
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Re: rattling valves
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They use Crank sensors. Timing is not adjustable.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
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Sep 24, 2011, 8:38 PM
Post #5 of 7
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Re: rattling valves
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How much they shave off the head? I believe for every .010 inch you take off, you lose a degree of valve timing on OHC engines. Of course, as RT stated you increase the compression ratio at the same time. The PCM should retard timing and make spark knock go away. Unless it is so bad, the computer can't compensate for it.
Does it rattle if you rev the engine with the transmission in park? The environment spark knock likes to reside in is higher than normal cylinder pressures when the engine is under load and/or high combustion chamber temperatures when the engine is overheating.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Sep 24, 2011, 8:40 PM)
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Hammer Time
Ultimate Carjunky
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Sep 24, 2011, 8:47 PM
Post #6 of 7
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Re: rattling valves
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I'm wondering if it even went to the machine shop at all.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Tom Greenleaf
Ultimate Carjunky
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Sep 25, 2011, 1:50 AM
Post #7 of 7
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Re: rattling valves
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Man am I'm glad I only own American old cast iron!
Tom
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