Really Bad Shaking Idle Problem???
 

on my 94 camaro z28 did tune up about 4,000 miles ago it has new opti,coil pulgs and wires never shak like this before all of sudden it starts to shak really bad while its on park to the point when it shuts off at times??...any ideas guys please help:confused: :( and suggestions please..Thanks

Re: Really Bad Shaking Idle Problem???
 

Do you have anyway of datalogging it?

Could be a bad opti, knock, running too rich or too lean at idle, clogged IAC, dirty maf, etc.

Re: Really Bad Shaking Idle Problem???
 

Unplug the maf and see how it runs.

Re: Really Bad Shaking Idle Problem???
 

what do you mean datalogging it puting it on the a scanner??...yeah ill try unpluging the maf lets see how it turns out??..thanks

Re: Really Bad Shaking Idle Problem???
 

well i unplug the maf and the car turned off...but every time i turn the car on it smells like its running rich and like a gas smell coming from the tail pipes?????..any ideas guys.:confused: :mad:

Re: Really Bad Shaking Idle Problem???
 

hello guys any one out there?????please :( ..

Re: Really Bad Shaking Idle Problem???
 

So it didn't run without the maf? It might take a few tries to get it going. Just unplug it and try to start it. Clean the IAC?

Is it throwing any codes at all?

Re: Really Bad Shaking Idle Problem???
 

ok check it out what i did was turn on the car and disconnected the maf while its running then it would shut off i didnt try starting the car while the maf is disconnected ill try that tomorrow...so what is the IAC again it slip my mind???...no codes no check engine light????....thanks

Re: Really Bad Shaking Idle Problem???
 

yea try it with MAF disc. heres a pic of the IAC, f/ shoebox:

http://shbox.com/1/iac3.jpg

that needs to be cleaned so it will seal properly, and the housing it seals to as well, but don't force it in/out.

Re: Really Bad Shaking Idle Problem???
 

hey i try starting the car with the maf disc and the car would not start..???...thanks

Re: Really Bad Shaking Idle Problem???
 

I had the same problem your having and someone recommended that I clean out my IAC. I cleaned it up and it worked. It now idles great. Does it run fine after you give it gas? Does it only do it when you have the a/c on or when you turn your steering wheel while at idle? If so, it's probably the IAC. Those were the symptoms I had.

Re: Really Bad Shaking Idle Problem???
 

on my car it idles really shaking for as long as i have the car running even when im driving????and when i give it gas it still shakes and it back fires even if im giving the car alittle gas it still back fires???...but yeah how do i clean the IAC????....thanks

Re: Really Bad Shaking Idle Problem???
 

First make sure you go to the store and get a throttle body gasket. Take out the 4 screws holding the the throttle body onto the manifold. Then disconnect any lines that need to be disconnected from the TB in order to be able to move it so you can get to the IAC. I found it easier to just disconnect everything and remove the whole throttle body. It only took about 10 minutes to get it off and 10 more to get it back on. Either way it's an easy job. Hopefully that will help your problem.

Re: Really Bad Shaking Idle Problem???
 

hey did your car when it would shake did it do it all the time even when your driving??..thanks for the info ill give a shot...thanks

Re: Really Bad Shaking Idle Problem???
 

I don't think its the IAC if it even shakes while accelerating......but the IAC is probably dirty if you've never cleaned it, so it needs to be cleaned anywayz. But if you have a violent shake while accelerating or free reving, its something else, I would think ignition - maybe burnt wire after install? bad opti or coil? Did it have these symptoms before you changed the opti/coil/wires/plugs? Same? Worse? Maybe motor mount?

Re: Really Bad Shaking Idle Problem???
 

I have the same problem as you...mine doesnt shake bad enough to shut off the car, but it shakes at idle as well as driving...heres what I replaced...

New IAC(which helped the underlying dropping RPM problem I had..but the shake is still there)
Opti
Coil
Plugs/HALF THE WIRES...Im thinking this is my problem, I never got around to changing all of them...Im going to do this next...
Cleaned MAF/TB


Im in the process of readjusting all of the Rockerarms to Zero lash...a while ago a few of my rocker arms loosened up, so I think some of them are off. I hope that'll fix the problem, if not...then im off to the wires.

Re: Really Bad Shaking Idle Problem???
 

yah i had in mind that it might be something do with the ignition but im going to replace the wires and the IAC hopefully this is the problem...but if not im going to replace the opti and coil as well.....thanks

Re: Really Bad Shaking Idle Problem???
 

yeah im going to check on the ignition system hopfully its something simple like a burnt wire or something but yeah im going to clean the IAC...thanks for all your help..

Re: Really Bad Shaking Idle Problem???
 

yeah i think it has something to do with the ignition system..no this is the first time this has happend to the car??...thanks

Re: Really Bad Shaking Idle Problem???
 

Pull all your plugs and check the gap. If ya got exotic metal plugs the tip on one of them may have come off and there is too much gap to fire.
Set them on .035 before ya put them back. That will make it easier to fire and eliminate the plugs as a cause.

Re: Really Bad Shaking Idle Problem???
 

Check your plug wires on the passenger side near the ac compressor. Best to check at night, witha spray bottle full of water. Soak down the plug wires and watch for fireworks, not the ones in the sky, the ones under your hood. Id be willing to bet one has touched the exhaust or gotten too close and melted. Been there, done that.

Re: Really Bad Shaking Idle Problem???
 

arent the spark plugs supposed to be gab at factory gabing which i think is 0.50????..yeah ill be checking those wires this weekend..so in order to see the fireworks do i have jack up the car and look from under the car????..hey thanks for all your guys help :bow:

Re: Really Bad Shaking Idle Problem???
 

.035 makes it easier for the opti to fire them.

Re: Really Bad Shaking Idle Problem???
 

:eek: crazy i didnt know that...ill remember that..thanks

Re: Really Bad Shaking Idle Problem???
 

The .050 plug gap was put there for idle emissions.
The plug gap IS resistance in the system and the more the resistance the harder it is to fire. Your wires,and plugs already have a resistor built in and when an opti gets a little weak it won't fire the BIG gap like it should causing the spark to back up in the opti and causing carbon tracking and ruining it.
The only thing a BIG gap does is that it is good for emissions and sells opti's and tune ups.

Re: Really Bad Shaking Idle Problem???
 

oh ok i see so should i go ahead and change out the plugs and wires again??..and gap the plugs at 0.35..thanks

Re: Really Bad Shaking Idle Problem???
 

Not if they are OK.Ya need to check them first.

Re: Really Bad Shaking Idle Problem???
 

cool thanks

Re: Really Bad Shaking Idle Problem???
 

I had the problem you describe and I traced it down to a missing platinum electrode on the ground side of the #6 plug. Put back in an old plug and the problem went away completely.

Re: Really Bad Shaking Idle Problem???
 

oh yeah the #6 plug is on the passenger side right...becuz ive notice when i started the car there is like a clicking noise coming from the passenger side like where the plugs and wires are....so i think its a bad or burnt wire but ill check this weekend...i just hope its nothing series :( ...thanks

Re: Really Bad Shaking Idle Problem???
 

the clicking noise is probably your starter I would assume, would have to be a dead hardcore short to make any kind of noise I would think.

Re: Really Bad Shaking Idle Problem???
 

LT1's eat plugs mine loves to munch em...383ci, 400rwhp....

Any update??