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I have a 04 crown vic pi . It starts fine but after a long trip it’s starts to spit and sputter so bad if I cut the AC on it will cut off. The car takes a long time to get up to speed when acting up. Just replaced the fuel filter and checked for vacuum leaks still no good. Any ideas please help. Thanks
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[quote=”wysetech” post=67188]You need to connect a fuel pressure gauge and read the pressure when it’s acting up.[/quote]
++++1 start with fuel pressure.
+1 to fuel pressure. It sounds like the fuel pump may be on it’s way out. If there is a check engine light get the codes pulled.
I ran the codes it gave me system too lean bank one and two, misfire on start up, rand multiple misfires, cylinder 5 misfire and cylinder 6 misfire
OK… Have you checked the fuel pressure yet?
All those codes can be caused by low fuel pressure.
-Karl
Fuel pressure is going to be a bit difficult to check on these to be honest. Starting in 2003, they took the schrader valve off the fuel rails (when I was trying to figure out my codes before discovering a cam jumped time I learned this), only 2 ways to check, either get the special T-adapter that goes inline on the connection to the fuel rail, or, scantool, typically looking high 30-low 40 off, mid 30s running. Anything lower, look at fuel pump.
Another common problem on these cars, especially on the P71s due to being in service, the CoP boots deteriorate over time, especially with the high underhood temps from extensive idle time. Replacing those could help clear up the misfire possibly…. tuneup would be best, new CoP boots and plugs, if you’re really gutsy, new CoPs too, stay away from Granatelli….. learned that the hard way.
Lean codes… the hard pipe going to the PCV rubs against the engine cover if you still have it, that could be one cause; plastic intake, high underhood temps, common for those to crack, could be another cause, especially if it’s somewhere you can’t see…
If it was lean on one bank only, running weird all the time, decreased fuel mileage and rattle on startup, I’d say check your timing set, though 04 and up should be safe since it’s past the recall/TSB, unlike mine, stuff can still wear out especially being a retired service vehicle, and if it gets bad enough, chunks fly, timing chain jumps…. Scantool showed about a 25-35% difference in fuel trims with that between banks, and compression was high 190’s on one bank and 140’s on the other when I had my issues… Turns out Bank 1 jumped one notch, and I barely had any guides left. Wasn’t a fun time for me…
Good luck, let us know what you find….
Would you know where I can get a adapter for the fuel rail my scan tool won’t tell me fuel pressure and what is CoP ?
[quote=”leonnoel82″ post=68326]Would you know where I can get a adapter for the fuel rail my scan tool won’t tell me fuel pressure and what is CoP ?[/quote]
cop=coil on plug 🙂
The plastic intake manifolds are wear items on these cars. You may have a manifold leak somewhere. If its throwing lean codes that means either there isn’t enough fuel reaching the engine, or there is an air leak somewhere past the MAF sensor. You may be able to pinpoint a leak by spraying intake cleaner around the intake manifold with the engine running and listen for a change while you’re spraying.
Sorry it’s been so long for reply but discovered the problem. Someone replaced the fuel pump and between the pump and fuel line outlet was a short rubber hose with two clamps. Whoever tightened these clamps did not have hose pushed far enough onto pump, over time the hose split so it was sucking air if the fuel level dropped below about a half tank. Hope this helps someone.
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