Question about 1998 Isuzu Rodeo

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Engine Knock on a 98 Isuzu Rodeo

Oil was 1/2 quart low, a friend was borrowing it and the motor started knocking. She drove it about 3 miles before realizing that it was knocking. I put oil in however, I ended up putting 5 quarts in. The motor is not seized up, the knocking has subsided a little bit but has not quit. The knocking gets worse as the vehicle idles up. I was told it could be a crank bearing?? Please help.

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  • Anonymous Feb 25, 2009

    same problem , it is a flaw in the piston ring design, which causes it to burn an excessive amount of oil, leaving you with a quart or less when it eats up the rod bearings on the crank, yes a rebuild is the only solution, a motor with lesser miles is still prone to the same happenings due to it having the same defective parts. Some after market companies have aftermarket design piston rings and pistons in an engine rebuild kit for the 3.2 as well as the 3.5 motors with this problem

  • Brandy Mooney
    Brandy Mooney May 11, 2010

    is this a tap or a knock?

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Most likely it is a rod bearing and motor would have to be dissassembled to diagnose, you might want think about installing a low milege used replacment since it was run 5 quarts low on motor oil.

Posted on Nov 30, 2008

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Motor knocks


Hello;
Before you start to pull the crank out, check your oil pressure via an independent gage. Then if you have around 25-30 psi gage, drain some oil out. Put a quart of Marvel Mystery Oil in and top off . Change oil filter. Drive the truck for a few miles. Change the oil and filter. This should start to break away the sludge that is built up.

You may need to do this up to 10 times before you can go 3000 miles on an oil change.
Now if the oil pressure is extremely low, yes you can change the crank in chassis. I have done it in a pinch before. It is much easier to pull the engine and put a crank in. If the crank is bad, you also have a rod that is bad. You also need to clean all the parts or emminent failure will occur.
I would also change the knock sensors on your truck as well. Hope this helps. Rate me high.
Thanks;
Rich
RPM Northwest

Feb 02, 2009 | 1998 Chevrolet Tahoe

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