not sure about this chatter

glittle75

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ok, I have a 98 GT, Automatic, with a longblock from a 80k mile Marauder (dont ask) in it.

It chatters, but only when under alot of load. sounds like a champ at idle, cruising speeds, and moderate (normal) acceleration. but if your in OD, and you give it gas, without allowing it to downshift, i.e. speeding up a bit, like when the speed limit goes up, it chatters. doesnt really get louder with more throttle, or faster with rpm increase. just a decently loud, annoying chatter. I cant make it do it at all while not in OD, or while not at WOT. O, yea, it also does it at more than id say 60% throttle, but only while moving, it wont do it if its not under load. i can rev it WOT in the driveway and nothing. and the wierd thing is, it ONLY does it once the car is at operating temperature. if you start it in the morning, and try to make it chatter before the temp gauge is dead center , it wont make a sound. i dont understand it. I use FMC 5w20 and a FMC Filter every change. I have tried putting in lucas, no changes, and i tried a little heavier oil, and same symptoms. i dunno.

also, im thinking the rings may be beginning to go. it smokes White/Blue-ish while in drive idling, and puffs a little bit when you take off. I have ridden behind it, and it doesnt constantly chug, and if you throw it in park, it stops smoking. Doesnt smell when your riding behind it, and doesnt use oil really at all.

I havnt done compression on it yet. i will post that asap. but im more worried about the chatter than the rings. If you guys have had or seen this help me if you can.


thanks
 

Willis_98GT

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how white is the smoke? i know that may be a stupid question but like is it a clear white smoke, or a thick boggy smoke?
 
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glittle75

glittle75

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its a clear white with a little blue tint. when its idling in drive, the smoke doesnt even rise over the bumper, it's dissipated by then, and when you take off, it puffs a little and then goes away.

put it this way, its not enough to notice unless your riding behind the car. i never noticed it driving, its gone before you can see it in the mirrors.
 
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glittle75

glittle75

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could the chatter under load maybe be a blown motor mount or exhaust bolt that has backed off?

im not sure if it could be because the motor is sitting pretty still under a constant load right? shouldnt be wiggling under load just when you are on and off the gas repetitivily correct? i dunno, just trying to figure this out, hoping its not inside the motor problems.
 

95PGTTech

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in gear, it's under load. in park, when you're revving it, it is under a load that is extremely small, practically none.

does the noise happen in park?
does the noise happen in neutral?
does the noise happen in drive with you standing on the brake?
 

justinschmidt1

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you mean you have a shortblock from a marauder?

if you had the longblock you would have a 4v and more than 204 rwhp
 
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