924S Starting Issues, Not the Fuel Pump Relay
09-24-2019, 11:02 AM
#1
3rd Gear
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924S Starting Issues, Not the Fuel Pump Relay
My '87 Porsche 924S won't start. I get in and turn the key, and it starts cranking but no starting.
Over the past few weeks the car has had trouble starting but it would always go after a few tries but not anymore. Even after it would start the engine seemed really uneven until warmed up almost as if a piston weren't firing. I don't wanna do too much more cranking because I'm wary of killing the battery. As guided by other posts I've tested the fuel pump relay, no issue there, I honestly doubt it'd a fuel pump issue. though I don't know of any particular way to rule that out. Could I be having spark plug issue's? And how would I test that short of replacing them and giving it a go? This car has been my daily driver and I really need it back to get to work.
Please, any help will be much appreciated! Thank you
Over the past few weeks the car has had trouble starting but it would always go after a few tries but not anymore. Even after it would start the engine seemed really uneven until warmed up almost as if a piston weren't firing. I don't wanna do too much more cranking because I'm wary of killing the battery. As guided by other posts I've tested the fuel pump relay, no issue there, I honestly doubt it'd a fuel pump issue. though I don't know of any particular way to rule that out. Could I be having spark plug issue's? And how would I test that short of replacing them and giving it a go? This car has been my daily driver and I really need it back to get to work.
Please, any help will be much appreciated! Thank you
02-02-2020, 04:13 AM
#2
Racer
A usual culprit for this problem is the Fuel Pressure Regulator. They tend to fail especially if they havent been replaced. A good way to check this is to remove one of the injector's power supply ( just detach the cable on top of the injector) . If the car starts and runs extremely rough then you know its the Fuel Pressure regulator. I did that check myself and after it did run rough, i replaced the FPL and the car has been starting without any problems since then.
Make sure you check which one is the right one , on my 1988 160bhp 924S I got a different one than the 150bhp 924S as they had different part numbers
Make sure you check which one is the right one , on my 1988 160bhp 924S I got a different one than the 150bhp 924S as they had different part numbers
