Question about 1986 Isuzu Trooper

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I have an Isuzu trooper that knocks at idel but will go away when driving. Oil pressure seems to be ok

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Try Running a decarbonizing oil treatment... problem could be whats called a carbon slap. it is carbon that has formed on top of the piston and what will happen is the carbon will separate from the piston and cause a knocking sound. if that doesnt work adjust the valves.

Posted on Apr 18, 2009

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Sounds like bad cam or crank bearings.

Posted on Apr 12, 2009

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My 1998 Isuzu trooper when cold it has delayed shift fom first to second then it shifts ok


sounds like a dirty oil or filter problem. It is taking this long for the viscosity of the oil to change to allow shifting. Run fault codes as well consider having an oil change done on the transmission ( oil colour should be cherry red not tan coloured.)

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If you red-lined it the most likely cause of a knocking noise is a spun bearing on the crankshaft. That means that a bearing has turned inside the bearing cap and is now restricting the oil flow. This will ruin your engine fairly quickly. The bottom end needs to come apart and the longer you drive it the worse it will get. Hope this helps.

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1 Answer

Oil pressure for 2001 isuzu trooper


I'd check to see what is in the crankcase currently; with modern multirange oils, that sounds high.
The typical operating range is from 30-60#; 10 seems low for an idle pressure but then idiot lights are supposed to trigger at ~ 4# pressure.
If it was mine, I would change oil and put a multirange type suitable for your area in it to see what influence it has. If you are in a temperate climate as I am, it might be time to change from summer to a winter range; 10W30 is good for us and 10W40 in summer (WV).   

Oct 13, 2008 | 2001 Isuzu Trooper

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