I took off my exhaust manifold to rebuild my turbo and the rear rotor exhaust port had the standard (I was told "good to see") tan coloring and the other was black. The only one I have seen that was black like that was on a rotor that was blown. I haven't seen enough to know if this is normal or something to look at. Possibly something like a bad coil, injector or something that is making it run differently (rich or lean)? Those of you that have taken off your exhaust manifold - did you have a tan color to the ports? Were both the same? Anyone have black ones that kept running for a long period of time afterwards?

Thanks for the replies - I just was wondering if this is a "sign".

Shawn

 

Mine were both the same beige chalky color. How is the car running?
~Tom

 

Mine too and my motor is very new. How does it run? You might want to pull the plugs and check them. If they are black you are rich, beige then just right, or white and that means too lean. Might also want to do a compression check.

 

I think the car is running pretty good beside the oil spewing from my turbo. Got 263 RWHP at 7 psi last week. I had sent off all the injectors for cleaning and balancing when I got my 850's bored to 1300's and added a HKS twin power to it and havent driven it very much since then. Athough I have been working on this project for almost 4 months the car is still new to me and I have driven it less than 600 miles (and most of that on one trip). I am also still driving on the power fc map which I would expect to be running rich but why one rotor and not the other? So I dont think it is the map. I am hoping it was one of my injectors and I have already fixed it.

Shawn

 

Oh and I haven't had a compression test done but my vacuum is 19psi at idle. Do vacuum and compression usually go hand in hand?

 

anyone?

 

you probally mean 19in/hg and not PSI, but that is a very good vaccuum nevertheless.

and compression and vaccum don't totally go hand in hand, but are good signs of each other. i would say your compression is still good iwth a vaccum like that.