Question about 1994 Chevrolet Lumina APV

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Hi,i have a 1994 lumina van with the 3.8 litre,it has 375,000 km's,it was running great until yesterday it started making a weird clicking/tapping sound,at fisrt i figured maybe it was one of the driven components so i removed the serpentine belt and started it,it still makes the noise but only when u rev a rittle from an idle,it sounds like its coming from directly behind the harmonic balancer,i'm puzzled as to what it may be?...could it have something to do with the timing components? still runs smooth,just an irritating noise,,,thank you..Dave

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  • wanna_b_mine Jul 19, 2009

    it only makes the noise at idle,if u rev a little it sounds fine but as soon as it idles back down the noise starts again?

  • wanna_b_mine Jul 19, 2009

    ok this is weird..if the serpentine belt is on it makes the noise constantly at idle only,but if u remove the belt it doesnt make it atall at idle but if u rev it quickly it makes it just for a second,

  • wanna_b_mine Jul 19, 2009

    oh and if u try to turn the engine over by hand it stops at a certain point like its hitting something,than if u turn it the other way it almost makes a complete revolution than stops again?...but it starts and runs ok except for the noise i mentioned,,what could this be..i'm puzzled?

  • wanna_b_mine Jul 19, 2009

    ok nevermind lol..i figured it out,i had a seperated harmonic balancer(rubber to steel bond was broken),i'll replace the balancer now...thanks anyways Dave

  • wanna_b_mine Jul 20, 2009

    ty for your input catvaman,but it was a seperated harmonic balancer,i picked up a used one from the wreckers($65.00)and replaced it myself,its fine now,but yea your theory makes sense,i hope i can get another year from the old van, i'm looking for a small 4x4 next(nissan or toyota)pickup., thanks Dave.

  • wanna_b_mine Jul 20, 2009

    oh when i said the engine stopped when turned by hand like it hit something,i wasnt actually turning the crankshaft lol...i was just turning the outer half of the balancer and it was hitting on the inner half somehow, i just noticed it when i tried to turn it again by grabbing the belt,the crankshaft didnt turn but only the outer ring of the balancer did,that the serpetine belt drives off of.


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The 3.8 has timing chain guides behind the timing cover and with the mileage stated, The timing cam and tensioners will need to be replaced.

Posted on Jul 20, 2009

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