Quote:
Originally Posted by cv129
Could you clarify whether your recent concerns/problems have been addressed, and how?
- Random TPS voltage drop
- Oil Leak
- GTM GTR Conversion Fuel Rail Crack
- Did 101 octane make any difference to the "knock" and ignition correction
- The weird ticking noise
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Sure thing
Random TPS voltage drop was actually from traction control during hard pulls - it was closing the throttle bodies to cut power and prevent wheelspin.
The oil leak was from a turbo return line fitting that had cracked. It's been replaced and no longer leaks.
The GTM fuel rail cracked and was leaking, we were able to repair it with some precise welding and it's had no problems since.
The 101 octane question & knock concern was before we found that the turbos were pulling oil through the open hole in the valve covers for crank venting under boost since their hose was connected pre-turbo. The vacuum from the turbos at high boost was pulling light oil into the charge piping tract and lowering octane. After we fixed it and took out all the charge piping, intercooler and cleaned it, we were able to slowly crank boost up no problem with no indication whatsoever of knock until about 20psi after fixing it, hence turning the high boost map for 92 octane back to 18psi where we were seeing no knock consistently.
The ticking under the dash I have no idea what it was, but I haven't heard it in over a month. It was definitely under the dash whatever it was.