Headgasket malfuntion???

[rkmillerjr]

Having some problems! We were tuning (rebuilt w/new pistons, rods, ported an polished head, upgraded fuel system, 3" SS exhaust, upgraded turbo and intercooler, Walboro fuel pump, etc) a fresh upgraded 4G63 (1,600 miles) on my 95 GSX. The tuning was going fine utilizing the AFCS and it was going well for about an hour. Then . . . . Air/fuel all off, can't boost, idles fine, but can't accelerate! Intially had overheating problems but a new FD aluminum radiator seems to solved that problem! We think it could be the ECU, MAS, or a malfunctioning headgasket! Can anyone provide some insight?

 

[GVR4592]

Have you done a boost leak test? Is the wastegate arm connected to the actuator? What do you mean "can't accelerate"? Does it not accelerate at all or is it just slow?

 

[rkmillerjr]

Boost leaks have been checked. I'll check the actuator tomorrow! By "can't accelerate", I mean that I need to accelerate very slowly and it fades and or hesitates a great deal when I try to accelerate more quickly. The Air/Fuel heads up to 15.8 or higher up to 18+ when I push it!

 

[GVR4592]

It sounds like you either have a leak between the maf sensor and the turbo, or there is a fuel delivery issue.

 

[rkmillerjr]

Ok, let me follow-up on that. The fuel system was gone over previously, but we'll take a look again!