Cars missing...stumped
Thread Starter
Joined: Sep 2003
Posts: 813
Likes: 0
From: Harlingen, TX.
Cars missing...stumped Car was missing pretty badly under 3k RPM after running around the city on an nos tune so I figured I fouled out my plugs. Pulled them driver side were fine but passenger side were black as hell(running rich) replaced them. Car was still doing the same then SES light came on and my 02's were dead not switching at all. So I replaced the 02's and plugs again and they looked the same driver side good and pass. black by this time the car was back to a normal n/a tune. Car is still doing the same stumbling and missing badly under 3-4k RPM even with new plugs & 02's!! Help please!!!!!!!! 
Sounds like the passenger side injectors are staying open. You could try switching the passenger injectors with the drivers side and see what happens. If the drivers side plugs go black then you need injectors, if it stays the same it sounds like something it telling the injectors to stay open PCM. A noid light would be great i'm sure you don't have one. Its a light that will flash every time the injector opens and close really cool! It could also be a wiring problem with a wire grounded thats making that bank stay open. Are there any other codes?
Originally Posted by BADBOYZ28
Car was missing pretty badly under 3k RPM after running around the city on an nos tune so I figured I fouled out my plugs. Pulled them driver side were fine but passenger side were black as hell(running rich) replaced them. Car was still doing the same then SES light came on and my 02's were dead not switching at all. So I replaced the 02's and plugs again and they looked the same driver side good and pass. black by this time the car was back to a normal n/a tune. Car is still doing the same stumbling and missing badly under 3-4k RPM even with new plugs & 02's!! Help please!!!!!!!!
Thread Starter
Joined: Sep 2003
Posts: 813
Likes: 0
From: Harlingen, TX.
Well I'll need to try swapping the injectors to the other side to se what it does to the plugs. Its only throwing the 02 codes nothing else as of right now. It doesnt show any missfires on any of the cylinders. But honestly I dont remember if the misfire code is on or off. None of the plugs are cracked the porcelain is fine on all of them. I was also told it might be the maf.........so I unplugged it and the car still does the same thing.
i had this happen to me on my old mustang the o2 harness was chafed and a couple of wires where grounding out causing the same problem. not saying this is your problem but i would check it out
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