Ok, before I get ragged for not searching, I want to say that I have read at least 20 threads on heat soak and/or hot start problems on here and SF. The majority of those threads point to CPS, coilpacks, and FPU VSV.
Ive tested, replaced and/or rewired all those parts. In addition I have swapped ISC, FPR, plugs, plug wires, fuel pump relay, main relay, EFI fuse and checked and/or replaced all the vacuum lines. Im quite certain I have spark signal at least, using a timing light to check for signal, and pulling #1 plug grounding it and checking for actual spark at the plug.
I still cannot get the car to start hot. When the car has been run for 10-15 minutes, if I shut it off and immeciately try to restart it it will restart ok, with a slightly rough idle for a second or two then clear up. If I shut the car off for 2-3 minutes, then try it will stumble and die, then crank with no hope of starting. Unlike some other people with hot start problems, mine takes hours and sometimes even overnight to get cool enough to then start properly. Last night while under a no start condition, I pulled the FPR off and other than a little spray, mostly air came out. Looking inside the fuel rail it looked empty. So Im lead to believe that my fuel is vapor locking, and only when the rail reaches a temp where the vapor either re-condenses, or the pressure is relieved in some other way will the system send fuel to the rail. (Im trying to logic this out, I dont know any of this for fact, more of an observation)
So I was thinking about replacing the Fuel pump and filter. I have a spare tank with a known good pump. But I really dont hold out an hope that it will actually fix the proplem as the heat issue is obviously under the hood not in the tank. Im going to get a fuel pressure gauge today and see if that will lead me to any more information.
Im hoping some fuel system expert here can give me some more information on the fuel system components and how they work, and point me in a direction that might solve the vapor lock issue. Also if anyone knows of any fuel system mods that might help, Im willing to give them a try. Moddified vent system? vented cap? Those sorts of things.
This problem is really starting to frustrate me, and I want to get moving onto fun and performance mods rather than just trying to get a running car.
Ive tested, replaced and/or rewired all those parts. In addition I have swapped ISC, FPR, plugs, plug wires, fuel pump relay, main relay, EFI fuse and checked and/or replaced all the vacuum lines. Im quite certain I have spark signal at least, using a timing light to check for signal, and pulling #1 plug grounding it and checking for actual spark at the plug.
I still cannot get the car to start hot. When the car has been run for 10-15 minutes, if I shut it off and immeciately try to restart it it will restart ok, with a slightly rough idle for a second or two then clear up. If I shut the car off for 2-3 minutes, then try it will stumble and die, then crank with no hope of starting. Unlike some other people with hot start problems, mine takes hours and sometimes even overnight to get cool enough to then start properly. Last night while under a no start condition, I pulled the FPR off and other than a little spray, mostly air came out. Looking inside the fuel rail it looked empty. So Im lead to believe that my fuel is vapor locking, and only when the rail reaches a temp where the vapor either re-condenses, or the pressure is relieved in some other way will the system send fuel to the rail. (Im trying to logic this out, I dont know any of this for fact, more of an observation)
So I was thinking about replacing the Fuel pump and filter. I have a spare tank with a known good pump. But I really dont hold out an hope that it will actually fix the proplem as the heat issue is obviously under the hood not in the tank. Im going to get a fuel pressure gauge today and see if that will lead me to any more information.
Im hoping some fuel system expert here can give me some more information on the fuel system components and how they work, and point me in a direction that might solve the vapor lock issue. Also if anyone knows of any fuel system mods that might help, Im willing to give them a try. Moddified vent system? vented cap? Those sorts of things.
This problem is really starting to frustrate me, and I want to get moving onto fun and performance mods rather than just trying to get a running car.
