SC400 hesitation problem i found (wanted to share )
#1
SC400 hesitation problem i found (wanted to share )
Hey there just wanted to share a little tale of my SC400 hesitation issue I had , I got this car about 10 months ago and ever since i got it it had a harsh misfire that drove me BONKERS!! because I swapped to 5 speed that I couldn't enjoy ,for months I couldn't figure it out , at first I thought it was a electrical issue because the last owner had it on cut springs and the tire ate the harness on the drivers side .
After repairing the Harness I still had the same problem , and after hours of reading , or DAYS of reading and hunting , I tested everything from Coil packs at cold then after warm up to the maf sensor with a scope ,I even did the fuel pump ECU power bypass and replaced the Pump and it still didnt fix it . Then about 3 months ago I figured I wanted to beef up my fuel system for my few new mods I am installing , At this point i have replaced my Lines /filter/ pump/ Then it clicked I forgot to check my Fuel Pressure Regulator ..... I ran a gauge and the walbro was pushing upwards to 80 psi and the pump got cooking hot , I installed a Holly FPR and boom the car goes like a bat out of hell no hesitation not even a skip of a beat , SO CHECK THE FUEL PRESSURE REGULATOR
Sorry for the long post but I'm hoping some day someone that might have the exact same problem as me see's this and it might help them
oh now I'm running -10 feed -8 return with a Aeromotive A1000 fuel pump
After repairing the Harness I still had the same problem , and after hours of reading , or DAYS of reading and hunting , I tested everything from Coil packs at cold then after warm up to the maf sensor with a scope ,I even did the fuel pump ECU power bypass and replaced the Pump and it still didnt fix it . Then about 3 months ago I figured I wanted to beef up my fuel system for my few new mods I am installing , At this point i have replaced my Lines /filter/ pump/ Then it clicked I forgot to check my Fuel Pressure Regulator ..... I ran a gauge and the walbro was pushing upwards to 80 psi and the pump got cooking hot , I installed a Holly FPR and boom the car goes like a bat out of hell no hesitation not even a skip of a beat , SO CHECK THE FUEL PRESSURE REGULATOR
Sorry for the long post but I'm hoping some day someone that might have the exact same problem as me see's this and it might help them
oh now I'm running -10 feed -8 return with a Aeromotive A1000 fuel pump
Last edited by IanWatson; 10-02-11 at 06:15 PM.
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#9
Lexus Champion
iTrader: (10)
Something similar happened to my SC400 when I fixed the leaky valve cover gaskets. I didn't notice that one of the plugs for the fuel injector was pulled because the plastic part that supposed to lock with the mate's already broken. But it was only for a couple of days before I found it.
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