89 460 Questions
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89 460 Questions
This motor does not like to rev past 3 grand and I was thiunking that maybe the ingnition timing is not advancing properly, also it will backfire really loudly in a down shift and eventually turn on the cel. Any help would be appreciated.
Elder User
Joined: Jan 2000
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From: Crooked River Ranch, OR
How many miles on the engine? Real high miles and a stretched timing chain could have allowed the chain to jump a tooth
You could take it in for a diagnostic check to read codes...some places can do that fairly inexpensivly.
Deen
You could take it in for a diagnostic check to read codes...some places can do that fairly inexpensivly.
Deen
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its got 75000 miles, the vacuume system is in perfect condition now. I have no exhaust leaks and the air injection system works perfect. Is the timing chain a probability, how often do they skip?
Last edited by CT300; Feb 19, 2004 at 10:26 AM.
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On my 89 it was the cat. It was plugged almost solid. You could remove it and dig all the crap out, and put it back on or just replace with a pipe. Don't know about emmision laws though. It may be a factor depending where you live
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I look into that, no immisions on this truck because its a dumper and the gvw exceeds what dmv cares about
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Elder User
Joined: Jan 2000
Posts: 966
Likes: 2
From: Crooked River Ranch, OR
Timing chains really don't jump teeth that often unless their is high mileage and a backfire or something similar that makes the engine "cough". 75,000 miles is not excessively high. I'd try BigTork's suggestion of dropping the cat and try running the engine with it unhooked to see if it will rev. Years ago I was working on a Toyota with simialr problems and the engine ran perfect as soon as we disconnected the muffler (no cat on that old Toyota).
Deen
Deen
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