Novablue454
15+ Year Contributor
- 166
- 0
- Oct 21, 2006
-
Arvada,
Colorado
So I figured i'd post in the problem diagnosis thread. So if you dont know, heres the deal. My talon is having some issues with hesitation upon acceleration. Its a 90 turbo AWD. The mods are a Hallman MBC, an Apex'i SAFC II, an Apex'i N1 catback, a TurboXs RFL BOV (recirculated), a Walbro 255, and an Aeromotive FPR.
Upon acceleration between 2500 and 4500 rpm, I can hear the car start to studder and feel it stop pulling as hard. It does it more often at part trottle, but occasionaly under full. If anyone is familar with vaporlock, it feels almost like that.
The problems started right after I got my car back from 9 second racing. I installed the fuel pump, the BOV, and the exhaust myself, but had some issues with the SAFC. On the way to the shop it drove fine, it was just idling at 2000rpm (i assumed because of injector overrun, as this was before the FPR). They finished installing the SAFC, and put on the MBC. It ran fine for a few days, untill one day I did a full throttle 1st-2nd-3rd-4th pull, and then it just lost all power and could barely drive home. I got it home, and replaced all the plugs with NGKBPR6ES. I performed a boost leak test, and found that the injector insulaters were leaking, as was the BISS o-ring (i believe) and the little plastic piece under the thermostat housing. I replaced the injector seals with the Home Depot ones, and I did a smalled version of the vacumn line elimination consisting off all the lines off the throttle body.
The MBC is set all the way down at 10psi, but at the time that everything went haywire it was at 16psi. Now if I try to turn up the boost any, it just studders worse and still wont go past 10psi.
The car is running alot better now, but its still studdering quite a bit. Im starting to lean towards the SAFC, as the engine RPMs that it reads are around 3700, when the car is at redline.
Does anyone have any other ideas or suggestions?
Thanks in advance.
Upon acceleration between 2500 and 4500 rpm, I can hear the car start to studder and feel it stop pulling as hard. It does it more often at part trottle, but occasionaly under full. If anyone is familar with vaporlock, it feels almost like that.
The problems started right after I got my car back from 9 second racing. I installed the fuel pump, the BOV, and the exhaust myself, but had some issues with the SAFC. On the way to the shop it drove fine, it was just idling at 2000rpm (i assumed because of injector overrun, as this was before the FPR). They finished installing the SAFC, and put on the MBC. It ran fine for a few days, untill one day I did a full throttle 1st-2nd-3rd-4th pull, and then it just lost all power and could barely drive home. I got it home, and replaced all the plugs with NGKBPR6ES. I performed a boost leak test, and found that the injector insulaters were leaking, as was the BISS o-ring (i believe) and the little plastic piece under the thermostat housing. I replaced the injector seals with the Home Depot ones, and I did a smalled version of the vacumn line elimination consisting off all the lines off the throttle body.
The MBC is set all the way down at 10psi, but at the time that everything went haywire it was at 16psi. Now if I try to turn up the boost any, it just studders worse and still wont go past 10psi.
The car is running alot better now, but its still studdering quite a bit. Im starting to lean towards the SAFC, as the engine RPMs that it reads are around 3700, when the car is at redline.
Does anyone have any other ideas or suggestions?
Thanks in advance.
