setup: fully rebuilt 7m, t61 turbo, stock 440cc injectors, afpr, walbro, 6 lbs of boost, 2.5" hardpipes, spearco replica, custom intake pipe, external wastegate, open dump tube, 3" back.
Car has been running with a very high idle, did some break in runs and drove it for a bit to try and seat the rings before hunting down the idle issue. Drives great, boosts well (too well, hits fuel cut for various reasons).
Starts up at about 1700 rpms, gradually drops to about 1100ish rpms steady after fully warm. Vacuum is about 14inhg steady at this rpm. No loping or vacuum . When engine is cut off the ISCV tick tocks. Due to the gradual reduced rpms during warmup I think the ISCV works.
Cant set base timing yet as the motor will not idle at 650. Tried to check for vacuum leaks with starter fluid with no luck. Then I plugged all ports into the intake manifold: ISCV, PCV, brake booster line, boost gage line on the back, and the port on the front that supplies a vacuum tree. The damn motor still runs... and actually pretty close to where it should be around 600-700 rpms.
So I have a pirate on board!
My question is what is the best course of action to take next? The leak must be in only a few places:
tb/intake mani gasket, iscv gasket, egr, upper intake to lower, lower intake to head. Like I said I sprayed the shit out of the manifold with no increased idle.... if there can be another pirate air leak location please let me know.
Should I just disassemble the whole intake side and start over piece by piece?
Car has been running with a very high idle, did some break in runs and drove it for a bit to try and seat the rings before hunting down the idle issue. Drives great, boosts well (too well, hits fuel cut for various reasons).
Starts up at about 1700 rpms, gradually drops to about 1100ish rpms steady after fully warm. Vacuum is about 14inhg steady at this rpm. No loping or vacuum . When engine is cut off the ISCV tick tocks. Due to the gradual reduced rpms during warmup I think the ISCV works.
Cant set base timing yet as the motor will not idle at 650. Tried to check for vacuum leaks with starter fluid with no luck. Then I plugged all ports into the intake manifold: ISCV, PCV, brake booster line, boost gage line on the back, and the port on the front that supplies a vacuum tree. The damn motor still runs... and actually pretty close to where it should be around 600-700 rpms.
So I have a pirate on board!
My question is what is the best course of action to take next? The leak must be in only a few places:
tb/intake mani gasket, iscv gasket, egr, upper intake to lower, lower intake to head. Like I said I sprayed the shit out of the manifold with no increased idle.... if there can be another pirate air leak location please let me know.
Should I just disassemble the whole intake side and start over piece by piece?
Last edited:
