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Username Post: 79 Chevy Luv engine knocking        (Topic#327083)
Forum Newbie
Posts: 3

Reg: 07-29-15
07-29-15 06:10 PM - Post#2565068    

Hi guys,
I have a 1979 Chevy Luv with only 20,000 miles that has run beautifully up until about a week ago when I started hearing a knocking noise in the engine. At first I thought it was something like rod knock or piston tap, but now I don't think so as the knocking isn't constant. It only starts knocking when you "overexert" the car, by which I mean go up any kind of hill or try and push it past about 20 mph. Any ideas on what this could be?


"13th Year" Silver Supporting Member
Posts: 4962
Loc: SoCal
Reg: 12-21-01
07-30-15 10:22 AM - Post#2565232    
    In response to iiLola

It sounds like it is "pinging". Add octane booster or put premium (92 octane) unleaded fuel in the truck and see if that takes care of the issue.

    1967 Chevrolet Impala SS convertible 327 - Ermine White C1 - VCCA Senior Award
    1967 Chevrolet Impala SS Sport Coupe 396 - Marina Blue FF - personal "barn-find" lol

Forum Newbie
Posts: 3

Reg: 07-29-15
07-30-15 11:23 AM - Post#2565241    
    In response to BigDogSS

I originally thought the same thing, but wouldn't the knocking be constant if it were pinging? Right now it only knocks when I push it past a certain point. Thanks for the suggestion though!

Frequent Contributor
Posts: 1535
Age: 62
Loc: Murphy N.C.
Reg: 01-25-14
07-30-15 03:04 PM - Post#2565277    
    In response to iiLola

Not necessarily, Carbon knock can sound a lot like a knocking noise.

Have a look at this.... ck.html

Forum Newbie
Posts: 3

Reg: 07-29-15
07-31-15 11:45 AM - Post#2565450    
    In response to junkman104

Mystery solved! The mechanical oil pump was loose and made a knocking noise once there was no oil to actually pump. Thanks for the ideas though!


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