Idle problems!!!!!!Need Help!!!

[Bluestang07-Eddie]

Been having a P0308 misfire for about a month now plugs have been changed also the cops have been replaced and a new complete intake system as well and i'm still throwing the code any ideas.I'm dumbfounded as what it could be now.

 

[Charlie Sheen]

http://s197forum.com/forum/showthread.php?t=26522

 

[Bluestang07-Eddie]

I will look into that as well but have had the tune in the car for over a year now and have had no issues have 60K on the car right about now.Thanks

 

[WTBTraction]

clean your throttle body and reset your ECU. I was throwing lean codes, idle issues, and misfires , and when I did that everything worked fine!

 

[Bluestang07-Eddie]

well the TB is brand new on the car and I reset the ECU already but thanks.

 

[MikeVistaBlue06]

What kind of gas are you running?

Have you used "octane boost?"

Have you used "Torco Unleaded Accelerator?"

Are you running aftermarket COPs?

Have you found out which cylinder is misfiring or is it random cylinders?

Check the connections and wires going to the COPs. Maybe one got pinched.

HTH

Mike

 

[one eyed willy]

well the TB is brand new on the car and I reset the ECU already but thanks.

did the code start after adding the "new" TB, what kind of TB is it?

 

[GrnBullitt08]

It could be a series of the things that can cause this issue, and there are a series of threads that discuss it.

 

[Bluestang07-Eddie]

did the code start after adding the "new" TB, what kind of TB is it?

its the stock TB that came off my friends car as well as the cops and the problem was there even before I changed the plugs, we thought it might have been that but it isnt going to see if we switch injectors to see if thats whats causing it.

 

[one eyed willy]

have you changed the 02 sensors? still running stock exhaust and manifolds?

 

[2014_GT]

O2 sensors, fuel filter, fuel pump, short in the wiring harness going to the COPs, etc., etc..

 

[Bluestang07-Eddie]

have you changed the 02 sensors? still running stock exhaust and manifolds?

nope on the 02 sensors and have borla catback system on the car

 

[Bluestang07-Eddie]

O2 sensors, fuel filter, fuel pump, short in the wiring harness going to the COPs, etc., etc..

filter has been changed and will look at the other stuff this weekend it only happens at idle cause one I'm on its fine just throws the code.But have no loss of power or any hesitation while on the highway.

 

[slow06stang]

Are all the boots that go from cop to plug in good shape. Maybe one is cracked/split. Make sure all the wire harnesses are plugged in and locked.

 

[Blacksmoke]

Has anyone mentioned the all simple possibility of a bad spark plug?
Ah saw you checked them.

Also injectors can cause this.
might be worth a shot

Also... if you are cammed then the tune can also cause this.
If the parameters are not correct the computer "thinks" you are misfiring when you are not.
I had this problem after searching just about every mech problem we could think of.

 

[Bluestang07-Eddie]

Are all the boots that go from cop to plug in good shape. Maybe one is cracked/split. Make sure all the wire harnesses are plugged in and locked.

nope they are all in great shape

 

[Bluestang07-Eddie]

Has anyone mentioned the all simple possibility of a bad spark plug?
Ah saw you checked them.

Also injectors can cause this.
might be worth a shot

Also... if you are cammed then the tune can also cause this.
If the parameters are not correct the computer "thinks" you are misfiring when you are not.
I had this problem after searching just about every mech problem we could think of.

and no not cammed, started with my tune that I had for over a year in the car had the problem comeup then before I decided to change the plugs and everything else figured that would fix it but not as of yet will look into more detail this coming weekend

 

[dysan]

I had some stumbling going on with my car and it turned out that there was too much dielectric grease in the cops and on the springs in them so I guess it was interfering with the connection to the spark plugs. I cleaned them all out as well as the springs that carry the current to the plugs and put a very light coating on the inside of the coil boot. That took care of the stumbling I had.

 

[lostsoul]

clean maf?

 

[Bluestang07-Eddie]

clean maf?

yes that has been done as well going to check it out more this weekend.