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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Posted on Jan 02, 2017

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Would the electronic distributor pickup cause a vehicle to spit,sputter and cut out at a high rate of speed ????


First you can not put Bosch plugs in it. Also watch cheap wires from parts house. Also check fuel pump pressure at high speed. Also watch for Catt converter plugging. Try unscrewing up stream o2 on both sides then drive. If goes away plugged Catt. You can scan those and see fuel values. Then you can tell. Any codes?

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Helpful?
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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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