MY 2.4 (weird motor idle)

Steven01 · 11-11-2007, 06:40 PM

i live in manitoba as you may know its not evry really warm here haha. but once my motor is all warmed up and oil is where it has to be. When im at a complete stop My car has a weird idle sound. I dotn know how to explain it but its kinda like a constint rattle.

would anyone know what this could be or how i could fix it? when i press on the gass the slight rattle disaperas rite away. :S

thank you,

01silveralero · 11-11-2007, 06:47 PM

just the sound of the cams loping around???? i hear it when the idle drops to ~600 rpm

Spilner521 · 11-11-2007, 07:45 PM

Is this a metal on metal sound you're hearing, or just a very faint rattle that you can really only hear if you're listening for it?

Metal on metal - possibly 2 things I can think of:

1) An exhaust hanger broke and somewhere the exhaust pipe is lightly touching something, which would rattle exactly what you're describing

2) The exhaust manifold heat shield is slightly loose and rattles at low idle as the engine shakes

Faint rattle - it's a noisy engine and the engine vibrates a lot at low idle. It's normal, mine does the same thing.

Vinalero · 11-11-2007, 10:27 PM

I still dont get it why ppl's 2.4 idle at 600 rpm....

01silveralero · 11-11-2007, 10:48 PM

Quote:

Originally Posted by Vinalero

I still dont get it why ppl's 2.4 idle at 600 rpm....

that's how it is suppose to be after it warms up

Spilner521 · 11-11-2007, 10:57 PM

Quote:

Originally Posted by Vinalero

I still dont get it why ppl's 2.4 idle at 600 rpm....

Yep, mine definitely idles at about 600 at operating temperature. Auto transmissions idle lower than manuals...yours is a 5 speed, which is why it won't idle that low.

Vinalero · 11-12-2007, 02:27 AM

Thats what I was wondering, in neutral you probly idle at 950 like me.

meadus101 · 11-12-2007, 10:01 AM

I Idle at like a Grand even.

pawzbear · 11-12-2007, 10:15 AM

I have a 2.4 with the same thing as well.. and spilner listed 2 causes of it in his list.

Something is vibrating in my exhaust a bit.. just a simple case of welding that i havent had done yet.
also my engine is a little noisy, idles high, guess just bc its really high mileage =/

other than that it runs like clockwork

Alero 2 Envy · 11-12-2007, 12:33 PM

My 2.4 Auto idles at 550-600, wish I could get to idle at 700-800 because the rough idle goes away then. Drives me crazy and with the AC on it feels like the doors are going to fall off !
As for your question check your hood latch in the front, mine did the crap and I put some duct tape around the hoop where the hood closes on and it went away. But then again yours could be totally different...

Steven01 · 11-13-2007, 07:10 PM

thanks for the help When i hear it,it sounds just like how you say its a low idle i belive. then again. its kinda like a constant sputter. if its supose to then alright but it sounds soo bad. always when the car is warmed up. yea and when the AC IS ON sounds just like you say. but im in winnipeg dont need ac for another 8 months ;p haha

thanks again.

lonnie · 11-14-2007, 09:03 AM

Yall know you can idle the car up. Wouldn't recommend it but to each his own. I have the 2.4L and mine idles at about 600rpm was lower then that until I changed my spark plugs.

NickAlero2000 · 01-24-2008, 11:08 PM

Hey...that happened to me about a week ago, first change the plugs and let me know how that goes
it may just be that you put bad gas in your car...after about a week of trying to figure mine out it just stopped so i think it was bad gas
another idea is your ignition coils may be bad...there is an elaborate test procedure that takes about an hour to do that i could write out for you if you want me to...just let me know how the plug change goes first should you do that

meadus101 · 01-25-2008, 02:08 PM

New member with alot of Info! Woo!

Steven01 · 01-25-2008, 08:27 PM

whoa thx I just got my car back after 2 months of sittin. Lost licends for a month then rite when i got licends back some oen tried to steal it and its been in auto body. UMm i think its about time to change spark plugs. What is a Good brand not nad on price. any sits you would reconmand

NickAlero2000 · 01-27-2008, 06:55 PM

AC Delcos work, try those first
next thing if u need me to i will post the procedure for the coil check
let me know how the plugs go

NickAlero2000 · 01-27-2008, 07:01 PM

i also didnt use a web site i just went to Pep Boys (prolly got ripped off, but I needed the plugs bad),
sorry it took so long to respond, my sister has an obsession with the computer (periods of more than 7 hours a sitting) and i rarely get to use it
ill check the post again tomorrow back in school

Steven01 · 01-27-2008, 11:15 PM

OK will Try that. probly put them in next weekend