2000 XKR - After replacing my EGR valve I went about a half mile when my car died like it was out of gas. It fires up normally but will only run for a few seconds. I am not getting any codes. Fuel pressure is OK. I have checked all the fuses and relays. There are no vacuum leaks. I checked the resistance of the coolant temperature sensor, crankshaft position sensor, both camshaft position sensors where they plug into the ECM and all are OK. I have tried a battery disconnect and hard reset. I have tried running with the EGR valve unplugged. I took everything back apart to see if I screwed up somewhere and didn't find anything wrong. Any suggestions on where to go from here would be greatly appreciated.

 

Check voltage to the fuel pump - check fuel pressure after engine starts and see if the pressure drops. When was the last time the fuel filter was changed?

 

I changed my fuel filter about a year ago. Fuel pressure is 42 psi and steady. Any more ideas? Thanks!

 

Is that 42 PSI when it dies or 42 PSI at Key On/Engine Off? Does the R Series have a fuel pressure regulator like my XK8? If so, try looking at the Fuel Pressure Regulator hose making sure it's not split or slipped off. Or the FPR itself...

You seem pretty thorough, you'll find the problem.

 

I have a fuel presure gauge with pressure release valve. After I turn the key on pressure comes up to 42 psi and stays there after the engine fires and dies. Pressure doesn't bleed off for days.
BTW, I observed that the throttle butterfly valve moves closed and then to slightly open when I turn the key to ignition (looks normal). But when I turn the key off butterfly closes, opens a little, closes, opens to about 10%, then closes. Is that normal?

 

This can be a few things, the first would be a collapsed catalyst blocking the exhaust. It could also be the ignition module if this car has one. These modules have a start and a run mode. Your run mode might be bad. I can't remember if the 4.0 has a module or just fires from the ECM....someone will know.

 

This applies to XKR models with two fuel pumps only. As it turns out the number 2 fuel pump was bad. Number 1 pump runs with the starter and as required for power only, thats why my car would start and run briefly. I removed the relay for Number 1 and hot wired pin 5 directly to the battery and got the car running. It was in restricted performance though with a code of fuel pump relay fault (d**m thing new I removed the relay). These cars are too smart. Replacing the fuel pumps was really fun - more on that later.

 

Glad you got it figured out. It's a continual learning process!





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