Hi all,
Currently having problems with my rb25 in my 33 gtst. Engine is recently built (head to toe, every performance box checked) has been run in and has previously had a 500hp full tune on it.
However after a recent incident in overheating & slightly warping the head, we've put it back together and gone to check the tune on the rollers, and initially it was revving out fine, however it developed an exhaust manifold leak (which we found to be the stainless manifold had warped and wasnt sealing) but now the thing wont rev out, it keeps stopping at ~2000rpm. However, as soon as u start the engine and rev it, it'll rev out without a problem, however as soon as u let it back to idle, it wont rev over ~2000rpm.
We've pulled the intake system apart, put it back together, checked for air leaks and we are 100% certain there aren't any. We've swapped out the Q45 afm with a brand spanker, same thing problem is still there.
Only thing we havnt done is to save the power fc map and reset the ecu, but this is going to be done tomorrow
Any insight would be greatly appreciated, as we now have no ideas of what the problem could be, or where to look/what to do.
cheers