My MK3 Turbo has been running like crap at boost over 10 psi and has been fouling plugs and sputters. Now for some History on the car:
Upgrades
I have the Lexus upgrade with 550cc Lucas injectors, AFM, Walbo fuel pump, rebuilt head, ARP studs, HKS 1.2mm MHG, upgraded JT57 Turbo, hardpipes, Spearco intercooler, 3" downpipe with a high flow CAT and an RSR 3" CAT Back exhaust, SAFC2, wideband, new wiring harness, etc.
Latest discovery
Since I have been fouling the plugs trying to figure this out; last night I decided to pull off the valve covers and check the compression and to re-tork the head. When I got the first valve cover off I discovered a small amount of radiator fluid in the #6 spark plug hole and a small amount of fluid near it? Now I am thinking BHG right, but I have none of the symptoms, no over heating, runs great until over 10psi of boost, etc?
So my next step was to do a pressure test on each cylinder. To my suprise, most of the compression testing came back with very high numbers. The highest cylinder was 179 psi and the lowest was 158 but the largest difference between any cylinders was around 13 psi. Can you have too much cylinder pressure in the 7MGTE????????
The rebuilt head was a head off a non-turbo supra and the engine shop used my cams. Could this be the huge pressure increase? I used a 1.2mm HKS MHG and ARP studs when I put her back together. The machinist I used said it would be fine but I want a few more opinions. This was all done on a 7MGTE engine with no prior blown head gasket and around 55K miles.
Troubleshooting so Far
CPS, Ignitor, Coil Pack, Plugs, Timing of course, AFM electronics module, boost controller, checked all the hard pipes and couplers for pressure leaks, replaced all air hoses, no air leaks any where.
Please help? :aigo:
Upgrades
I have the Lexus upgrade with 550cc Lucas injectors, AFM, Walbo fuel pump, rebuilt head, ARP studs, HKS 1.2mm MHG, upgraded JT57 Turbo, hardpipes, Spearco intercooler, 3" downpipe with a high flow CAT and an RSR 3" CAT Back exhaust, SAFC2, wideband, new wiring harness, etc.
Latest discovery
Since I have been fouling the plugs trying to figure this out; last night I decided to pull off the valve covers and check the compression and to re-tork the head. When I got the first valve cover off I discovered a small amount of radiator fluid in the #6 spark plug hole and a small amount of fluid near it? Now I am thinking BHG right, but I have none of the symptoms, no over heating, runs great until over 10psi of boost, etc?
So my next step was to do a pressure test on each cylinder. To my suprise, most of the compression testing came back with very high numbers. The highest cylinder was 179 psi and the lowest was 158 but the largest difference between any cylinders was around 13 psi. Can you have too much cylinder pressure in the 7MGTE????????
The rebuilt head was a head off a non-turbo supra and the engine shop used my cams. Could this be the huge pressure increase? I used a 1.2mm HKS MHG and ARP studs when I put her back together. The machinist I used said it would be fine but I want a few more opinions. This was all done on a 7MGTE engine with no prior blown head gasket and around 55K miles.
Troubleshooting so Far
CPS, Ignitor, Coil Pack, Plugs, Timing of course, AFM electronics module, boost controller, checked all the hard pipes and couplers for pressure leaks, replaced all air hoses, no air leaks any where.
Please help? :aigo:
