Weird Idle.. [Archive] - GrandAmGT.com Forum

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Ajaxus
05-01-2007, 03:06 AM
I did some searching tonight, couldn't really find anything on this so here goes...

When I first start my car it runs VERY rough, I get a "thumping" noise that seems to be coming from near the belt. But it goes away after I drive around for a good 5-10 minutes..the idle goes back to normal, no sound..just weird.

You can hear the sound extend back through the exhaust, thats just how noticable it is. I would imagine since it's near the belt it must be in some relation to it, but I don't know what I'm looking for.

It was also dark tonight when it started doing it, so I couldn't get a decent look..gonna have to wait another few hours before I can. ;crap

Ajaxus
05-01-2007, 06:15 PM
25 views and NOTHING?

c'mon ppl...

cardude007617
05-01-2007, 06:38 PM
well my sounds as tho the engine is like clunking sorta but not actually clunking? like a loose sound?? get it at all?
i think early running on these cars are just a lil odd

drumking1721
05-01-2007, 08:03 PM
I get a clunking as well when its cold(engine) but after a few it all goes away

Sprucegagt
05-01-2007, 10:41 PM
25 views and NOTHING?

c'mon ppl...

I wish I could help ya AJ. But you have a problem that's hard to diagnosis over the internet. I would have to be at the car to help.

Ajaxus
05-02-2007, 03:06 PM
yeh..and it cant be from the cold cause its been mid to high 60s around here alot lately.

doesn't really sound like something loose..that would make a rattle. this is a "thump" no other word to describe it. imagine hitting the wall over and over again with the palm of your hand..kind of like that.

gectek
05-02-2007, 10:05 PM
is this with the AC on or off...

Ajaxus
05-02-2007, 10:58 PM
off

gectek
05-02-2007, 11:35 PM
hmm, well idk the knocking noise is kinda funny, and only from the back. may be a loose bracket or something on the trans or maybe a loose alt bracket or engine lift bracket would be my first guess

alerored04
05-02-2007, 11:49 PM
i have what sounds like a loose bracket rattling when my ac is off and the motor is cold. Turn the ac on and bam its gone. I think the clutch or something in my ac compressor is on its way out. Could it be a wobbly idler pulley or something like that? That would probably squeak more than a thump but you never know.

gectek
05-03-2007, 10:33 AM
no it would have nothing to do with the AC, i would look at the brackets and pulleys around it