Northstar Engines and System Technical Discussion Discussion, Hot start...but not the FPR! in Cadillac Engine Discussion; If you have been tracking my posts I have a hot start problem when my car's been parked for at ...
If you have been tracking my posts I have a hot start problem when my car's been parked for at least half an hour after the engine warms up. First I thought it was my stereo and I ripped it all out, then I had a shop run a cleaning agent to clean my fuel injectors, replaced the fuel pump relay & filter, plugs & wires are 8 months old and the car runs perfect when it's running. I replaced the FPR this weekend and the problem did not improve a bit (60 dollars down the drain ). One thing I noticed when I removed the old FPR was a coat of very dark red oily substance under the FPR and probably all around whatever else that's connected to the underside of the FPR, my friend and I couldn't figure out what it is but I don't think it should be there (should be just fuel).
Actually my mechanic told me the FPR is fine...he followed the vaccum test on this forum but I just want to eliminate all the possible faulty parts. Fuel pressure comes out to be 42psi. Again the car drives perfect when it's running.
However I do have one question...what are those wires running into the passenger side of the engine compartment? It's a black plastic wire organizer and that's where my power wire for the stereo goes through (wires were the only component I didn't remove when I took everything out). I trimmed the plastic part so the thick wires can go through and it's really close to the factory wires.
When you start it, it turns over... does it try to fire? Do you hear a couple puffs? Does it just crank? How long does it take until it does fire up? Does it start up if you let it cool down? (is that the only way it will start?)
What happens when you push the pedal down when you try to start it? Does it start easier? Not effect it at all?
I had the same problem with my Trans AM but thats a crossfire lol. (AKA designed by those who had developed the caddy 4 6 8 motor so you kno the set up is shit) i had to replace the ECM worked fine ever since
I'd hook up a fuel pressure gauge and check it every time I started it. It would be nice to have it sticking out of the hood where you could easily see it.
The check ball in the fuel pump could be leaking and letting the fuel drain back to the tank. I realize this should be true on cold starts also but this is the next step I'd take. If it showed 40+ while no start it would eliminate pump.
I thought the fuel pressure was not to be under 45- 50 PSI? Is that just pre starting the motor? I was ready to change the fuel pump because my car running is at 35 PSI.
Fuel pressure should be at least 40psi idling, and it should rise 5psi if you disconnect the vacuum line to the FPR. If that is not the case, you need to investigate and/or replace the fuel filter, FPR, or fuel pump.
I've had a similar problem with my 98 SLS. The car will not start after approx. 5 min. when hot. It wil start before and after that time period and it doesn't do it all the time. Everything checks out. Now, to play it safe, I depress the throttle slightly to ensure that it starts when I fill up for gas.
My fuel pressure is at 42psi so it's normal, I now have to tap the gas pedal halfway down to get the car to start. My car does the long cranks mostly when the engine is warm but sometimes cold. I'm guessing there might be some sort of gas leak that drained the gas out so it takes time for the fuel pump to refill the gas line?