Engine shuts on and off

Tiny
STEPHENGREER
  • MEMBER
  • 1997 JAGUAR XJR
  • 160,000 MILES
I can drive this vehicle for about 15 minutes then she shuts off and on with the gauges flashing like the key is turned off and on. After I let her sit for a couple of hours or more she will run perfect for about 15 minutes and then the same thing happens. Please advise? Only code I get on the OBII is PO411 MOD$11 secondary air injection which should not effect performance? Also the SRS airbag light comes stays on until she cools back down. Same thing every time! All the lights flash on and off in the dash when she is freaking out. Thanks! Greer
Tuesday, June 11th, 2013 AT 7:14 PM

4 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 POSTS
When the event occurs, you need to find out what is missing, fuel pressure or spark. Once this is determined, we can proceed.

Roy
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Wednesday, June 12th, 2013 AT 4:37 AM
Tiny
STEPHENGREER
  • MEMBER
  • 7 POSTS
Its seems to me that the two fuels pumps are going out, the tumbler in the ignition is bad and has been for over a year but it doesn't seem to be the problem. I will measure the fuel pressure to see if the pumps are going out. Thanks! Why does it wait to warm up before throwing symptoms?
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Wednesday, June 12th, 2013 AT 5:52 AM
Tiny
STEPHENGREER
  • MEMBER
  • 7 POSTS
Vehicle is being diagnosed right now and the fuel pressure being tested so any guess's prior?
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Monday, June 17th, 2013 AT 3:34 PM
Tiny
STEPHENGREER
  • MEMBER
  • 7 POSTS
OK diagnosis shows that the fuel pumps are working so the problem is electrical. The search is on something is telling the computer to shut off the fuel pumps. Any answer's please advise. Currently waiting information from England based on scope information while the car is shutting on and off. 8 possible modules are being analyzed tomorrow will know unless someone can tell me know? Thanks Greer
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Tuesday, June 18th, 2013 AT 5:00 PM

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