Misfire Problem

[Willicuddy]

Ok so I'm having this problem with the car missfiring. Car shakes and misses. More noticable at lower RPM's around idle speed 700-1000rpm. I am not having any CEL's coming on due to the problem I have not noticed any drivability isses becasue of it. Also makes a weird high pitch noise coming from the Intake manifold area, im not seeing any arching and there are no visible rips/tears in the plug wires.

What ive tried so far:

-Boost leak test done (no leaks)
-New NGK plugs and wires
-Ran some fuel injector cleaner through the fuel system
-Pulled each injector plug and spark plug wire to see if I could isolate the problem

Wondering if anyone has any input or has experienced this same issue.

 

[talonTSIDriver]

So it does not misfire when running higher rpm's?

 

[Willicuddy]

It is hard to tell, but i don't think that it does

 

[CyberEye]

It is hard to tell, but i don't think that it does

you'd know if it did at higher RPM's

 

[Willicuddy]

It misfires throughout the entire rpm range

 

[seth98es]

How do the plugs look after running for awhile? Any of them look brand new? Any of them have more carbon then the others? The plugs will tell you a lot in a misfire situation.

 

[Willicuddy]

Ran a set of plugs for about 6months/6000kms and after i changed them just the other day they all looked the same. No sign of carbon buildup or detonation.

 

[Ced]

How do the plugs look after running for awhile? Any of them look brand new? Any of them have more carbon then the others? The plugs will tell you a lot in a misfire situation.

I m having similar problems how could i tell wich plug is giving me mise firering problems?

 

[Willicuddy]

The plug that doesn't look like the rest of the plugs. One that has carbon build up, or looks like that cylinder has been detonating.