belize1334
Well-known member
Help me diagnose this will ya?
I recently installed a set of FIC 650's which were flow tested and cleaned at FIC along with a Keydiver chipped burned to match. I didn't notice anything at that time really as the weather was cold and I wasn't driving much. Then I pulled and reinstalled my turbo as well as the transmission.
Now I'm getting an extremely rich reading on the o2 (narrowband). The low o2 trim reads 81%. I also have white smoke coming out of the exhaust when the car idles. It's not alot (looks like you might expect on a cool morning) but when I tip in the throttle it billows a bit more. Doesn't seem moist and doesn't smell sweet (or like anything really). The mid and hi fuel trims seem fine.
I thought at first that the dead-time might be off but as a test I lowered to fuel pressure to see if it would affect the trims. I had it all the way down to 28psi and the fuel trim only just started to rise (86 instead of 81) and I was still getting white smoke.
So...
I'm thinking... white smoke is probably oil. Maybe from the turbo (though the charge pipes are clean) or possibly from a failed stem seal? The question is, would burning oil also cause the fuel trim to read rich? I'm thinking...oil is a hydrocarbon so maybe? This might also explain why the mid and hi fuel trims are more in line if I'm burning more air/fuel at those levels and the oil is less of a factor. I also thought perhaps that I might be burning coolant but I'd think I would be able to smell it and it doesn't explain the fuel trims.
Thoughts?
I recently installed a set of FIC 650's which were flow tested and cleaned at FIC along with a Keydiver chipped burned to match. I didn't notice anything at that time really as the weather was cold and I wasn't driving much. Then I pulled and reinstalled my turbo as well as the transmission.
Now I'm getting an extremely rich reading on the o2 (narrowband). The low o2 trim reads 81%. I also have white smoke coming out of the exhaust when the car idles. It's not alot (looks like you might expect on a cool morning) but when I tip in the throttle it billows a bit more. Doesn't seem moist and doesn't smell sweet (or like anything really). The mid and hi fuel trims seem fine.
I thought at first that the dead-time might be off but as a test I lowered to fuel pressure to see if it would affect the trims. I had it all the way down to 28psi and the fuel trim only just started to rise (86 instead of 81) and I was still getting white smoke.
So...
I'm thinking... white smoke is probably oil. Maybe from the turbo (though the charge pipes are clean) or possibly from a failed stem seal? The question is, would burning oil also cause the fuel trim to read rich? I'm thinking...oil is a hydrocarbon so maybe? This might also explain why the mid and hi fuel trims are more in line if I'm burning more air/fuel at those levels and the oil is less of a factor. I also thought perhaps that I might be burning coolant but I'd think I would be able to smell it and it doesn't explain the fuel trims.
Thoughts?
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