Well my 99 SS Camaro's tach was acting up and the car was missing horribly. When hooked to a snap on diagnostic tool it said bad cam sensor and multiple misfires.

Swapped the Cam Position Sensor yesterday and the tach is reading/miss went away. The SES light has been on since I bought the car but it flashed for the first time yesterday when driving. I figured it needed a set of spark plugs and would go from there.

Today after pulling the plugs all of the odd cylinder plugs are a whitish tint but the even cylinders are black as can be. We checked all the coil pack connections and nothing appears to be wrong. Cleared the codes and drove it back home.

After driving 4-5 miles the SES light came on and started flashing again. The car runs great and doesn't appear to be down on power. I can't tell it missing at all.

Does anyone have any good ideas? Here are the mods on the car:


LT's
OR Y pipe
Magnaflow Catback
Ported MTI TB
MTI Lid
MSD Wires

 

What are the fuel trims when this is happening?

 

I dont know. Will the snap on solus diagnostic tool be able to check?

 

Yes. I have seen injectors that were not within spec that would cause this. I use an afit injector tester frequently at work and it will show the flow difference between each injector. Would be good to see what the trims are acting like.

 

Ended up putting in a new o2 sensor in the passenger side upstream and new intake gaskets. The car is running like a top now with 0 issues! Thanks for the help guys.