I have been diagnosing a random stalling issue with my 4.6 gems(160k miles). I’ve cleaned and inspected idle valve,TPS,MAF,Throttle body. Replaced the Crank sensor because most posts pointed to that being the main culprit.
So.... the only code I have seen is “random multiple misfire-drive cycle C”. No MIL light or any other notification that anything is wrong. However, my butt dyno tells me she is sick and not running well.
I believe I have narrowed down the issue to either my fuel pump or cam sensor.
My question is..how quickly should I see the 34-37psi fuel pressure? Mine seems to slowly build pressure over time, to an acceptable value. Takes about 5-10 seconds,and sometimes I’ll need to flip the key again to get it up to 34psi. But I believe that it should be almost instant..Iam not sure..
Also, I’m not sure if the 34-37 psi should be at a relative constant. I get about 25psi at idle and maybe a little more or less while revving.
Seems like a weak/dying fuel pump to me. Anyone got any ideas for more testing or tips?
I did pull the vacuum hose off the regulator and it seems good. Psi went up very quickly to around 50psi. My next test will probably be fuel pressure before the fuel filter and a volume test..
Thanks in Advance
So.... the only code I have seen is “random multiple misfire-drive cycle C”. No MIL light or any other notification that anything is wrong. However, my butt dyno tells me she is sick and not running well.
I believe I have narrowed down the issue to either my fuel pump or cam sensor.
My question is..how quickly should I see the 34-37psi fuel pressure? Mine seems to slowly build pressure over time, to an acceptable value. Takes about 5-10 seconds,and sometimes I’ll need to flip the key again to get it up to 34psi. But I believe that it should be almost instant..Iam not sure..
Also, I’m not sure if the 34-37 psi should be at a relative constant. I get about 25psi at idle and maybe a little more or less while revving.
Seems like a weak/dying fuel pump to me. Anyone got any ideas for more testing or tips?
I did pull the vacuum hose off the regulator and it seems good. Psi went up very quickly to around 50psi. My next test will probably be fuel pressure before the fuel filter and a volume test..
Thanks in Advance