1991 Isuzu Truck engine knocking

1991 ISUZU TRUCK
154,000 MILES
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JOE1953
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engine knocking on a 1991 Izuki pickup Truck i think it might be a rod bearing is there a way i can check the rod bearing while the engine is running, is there something in a bottle i can use to stop the knocking sound. one time the throttle stuck wide open and about a quart of oil came out some where under the truck but i don't no where.
Jul 9, 2013 at 9:14 PM
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HMAC300
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pull aprk plug wires one at a time if the kocking stops you found the cylinder. no there is no magic cure in a bottle. it will need crank reground, new bearings and possible rod if damaged to far
Jul 10, 2013 at 7:07 AM
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JOE1953
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i pull all spark plug wires one at a time and the engine is still knocking what else can cause the knocking, and it is also running rough the two spark plug wires from the front when i pull them off the engine don't change but the second one from the back when i pull the spark plug wire the engine cut off the oil light go right out when start the engine, sometime the oil light blink on and off when coming to a stop but go out when press on gas.
Jul 12, 2013 at 10:59 PM
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HMAC300
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as I can't hear the knock it is very hard for me to diagnose. it cold be a cam or main bearing my advice is to take it to a local pro for them to try to give you a better diagnosis.
Jul 13, 2013 at 5:50 AM