Question about 1989 Isuzu Pickup 2WD

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I HAVE A KNOCK IN THE MOTOR AT HIGHT SPEEDS. UN PLUG THE VACCUM AT THE DISTRIBUTOR IT GOES AWAY. WHAT COULD IT BE ?

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Timing is out

Posted on Oct 08, 2010

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Hello,
your problem appears to be the idle control motor located on the air intake manifold it is a small motor that goes bad quite often. Other items that can cause this is a bad /clogged air filter or a tune up (spark plugs and wires), or clogged fuel injectors. to clean the injectors you can buy a container of fuel system cleaner and pour it into the gas tank and as you drive it cleans the system.

Once the fuel system is cleaned via a tankful of cleaner & gas then the idle controller motor would be next on the list to be replaced.

Good Luck !
Rich Lilja

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