mitsustar86 Posted May 9, 2013 Report Share Posted May 9, 2013 Just got my new turbo and when I took the one off my car I noticed the inside of the exhaust manifold and housing had white residue on it. I thought its normally black? Does this mean I'm not getting enough fuel? Or too much? Or somthing else? Link to comment Share on other sites More sharing options...
quickStarion Posted May 9, 2013 Report Share Posted May 9, 2013 Means there is a exhaust leak. Whenever there is a crack or leak there is a white residue around it. Link to comment Share on other sites More sharing options...
Starfighterpilot Posted May 9, 2013 Report Share Posted May 9, 2013 Were you losing any coolant before you changed the turbo? If so, the "white" residue is indicative of coolant going through the exhaust system. The source of the coolant leaks could be the old turbo coolant seals weeping or perhaps you have a weep in the block to head gasket, in the intake manifold/head gasket, or in the TB to intake manifold gasket/o-ring. If you want to know if you have a coolant system weep then run a coolant system pressure test, or if needs be a compression test test on all of the cyclinders. If the residue is beige to tan in color it could be the residue from running the crappy gas & it's additives that we are forced to run. If you still have coolant loss then I would STRONGLY suggest that you gut the primary cat if it hasn't been gutted already. Over many years on SQC, engine coolant in the exhaust system has been shown to cause corrosion and clogging of the primary cat converter. For What It's Worth. KEN PS - I moved your post to the Virtual Mechanic Forum where it belongs. Link to comment Share on other sites More sharing options...
jszucs Posted May 9, 2013 Report Share Posted May 9, 2013 ^ Isnt the turbos coolant area separate like a water jacket? Link to comment Share on other sites More sharing options...
JAinsworth Posted May 9, 2013 Report Share Posted May 9, 2013 ^ Isnt the turbos coolant area separate like a water jacket? Yes, but if you have a coolant leak, for example, a slightly blown headgasket or possibly the gasket on the tbi assembly, it will show up in the exhaust. Jimmy Link to comment Share on other sites More sharing options...
BC_99 Posted May 10, 2013 Report Share Posted May 10, 2013 True, but isnt the turbo after the manifold (in the flow of things)??? How would a leaky turbo make the mani get white residue? Link to comment Share on other sites More sharing options...
Technology Posted May 10, 2013 Report Share Posted May 10, 2013 Also if you're running high octane fuel, particularly leaded blends, it will make the manifold, turbo and exhaust white. Link to comment Share on other sites More sharing options...
patra_is_here Posted May 10, 2013 Report Share Posted May 10, 2013 isn't the residue a normal byproduct of combustion? Link to comment Share on other sites More sharing options...
Technology Posted May 10, 2013 Report Share Posted May 10, 2013 it won't be sooty black unless it's too rich, right? Link to comment Share on other sites More sharing options...
Shelby Posted May 10, 2013 Report Share Posted May 10, 2013 turbo didn't cause any thing,, it just make it visable for him to see once it was removed Link to comment Share on other sites More sharing options...
mistapickles Posted May 10, 2013 Report Share Posted May 10, 2013 isn't white soot from a lean running motor? I had white soot in my exhaust and it was because my CTS was screwed up and making me run lean. Link to comment Share on other sites More sharing options...
Shelby Posted May 11, 2013 Report Share Posted May 11, 2013 any thing is possible but the oem ecu can only change the fuel mixture 10% , and makes no mixture changes during boost , fuel is delivered from a pre set map , using TPS, air mass and increasing fuel pressure most times the ecu will default to open loop when the CTS signal is messed up, and open loop is over rich for most driving Link to comment Share on other sites More sharing options...
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