1987 Jaguar XJ6 Car would'nt start

Tiny
BENTLEY EVERSLEY
  • MEMBER
  • 1987 JAGUAR XJ6
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
My 1987 Jaguar xj6 shut down while driving. I checked and was not getting any gas. I replace the fuel pump, which had a very faint hum when running. After replaceing the pump the car will not start, I check for voltage at the pump and did'nt have any voltage. I check for voltage at the relay had voltage at one of the 5 pins but no output voltage to the pump. I replace the relay and still no voltage to the pump. I checked the wire from the fuel pump to the relay and found no shorts. These test were done while cranking and ignition on. I went as far as to disconect the (-) negitave cable from the battery and clip a test light to the terminal and the probe to the (-) post of the battery to check for shorts, and found no shorts. Whats up.
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Tuesday, November 11th, 2008 AT 10:58 PM

25 Replies

Tiny
JAMES W.
  • MEMBER
You should be able to hear the pump run for 2 or 3 seconds when you turn the key to "on", not to start. If "no" check the ignition "on" relay. If "yes", but no pump on cranking, check to see if you have spark on cranking. If no spark or fuel on cranking, replace the crankshaft position sensor.
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Wednesday, November 12th, 2008 AT 9:25 PM
Tiny
BENTLEY EVERSLEY
  • MEMBER
The fuel pump does'nt come on when the key is in the on position, or while cranking. The fuel pump is new and so is the fuel pump and main relays. If I put power directly to the fuel pump is does make a loud hum.
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Friday, November 14th, 2008 AT 8:33 AM
Tiny
JAMES W.
  • MEMBER
Check to see if you have spark at the plugs. When you turn the key to "on" you should hear the fuel pump run for just a couple seconds. Is this so?
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Friday, November 14th, 2008 AT 2:11 PM
Tiny
BENTLEY EVERSLEY
  • MEMBER
To whom it may concern, I'm getting a spark but the fuel pump is not comming on.
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Friday, November 14th, 2008 AT 9:05 PM
Tiny
JAMES W.
  • MEMBER
I have an '88 XJ6, but the break year for wiring was '88/'87. Do you have, or have access to, a fax #. I'll ship you some diagrams that will make it easier for you. The fuel pump relay gets its signal to close from the ECM. If you didn't have spark as well as fuel I would say the crankshaft position sensor was out, but, you have spark so it rules that out. Please advise and I could get the diagrams out yet tonight, Jim
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Friday, November 14th, 2008 AT 11:03 PM
Tiny
BENTLEY EVERSLEY
  • MEMBER
Hi Jim, sorry I don't have access to a fax machine, but I do have a printer.
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Saturday, November 15th, 2008 AT 8:49 AM
Tiny
JAMES W.
  • MEMBER
Let me see what I can put together. I'll try to get back to you today.
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Saturday, November 15th, 2008 AT 4:28 PM
Tiny
PRINCEOFDARKNISS
  • MEMBER
Did u check the interia cut of swich?
If may be bad or going bad
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Monday, November 17th, 2008 AT 9:36 AM
Tiny
PRINCEOFDARKNISS
  • MEMBER
IF your jag has it, it


http://www.2carpros.com/forum/automotive_pictures/271868_Xj6_1.jpg

should be in the spot marked
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Monday, November 17th, 2008 AT 9:50 AM
Tiny
BENTLEY EVERSLEY
  • MEMBER
Hi there Princeofdarkniss, Thanks for the info. I did check the Interia Switch several times by pushing it up and down, fleaving it in the up position. Would you know how I can go about bypassing it? By the way I love meeting other Jaguar owners.
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Monday, November 17th, 2008 AT 11:32 PM
Tiny
JAMES W.
  • MEMBER
The enertia switch should be pushed "down" to be reset. Don't forget about the CPS.
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Tuesday, November 18th, 2008 AT 10:22 AM
Tiny
BENTLEY EVERSLEY
  • MEMBER
Hi james, What is the CPS? Also I'll make sure the interia switch in in the down position. I'll let you know how things go, when I get the next break from work.
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Wednesday, November 19th, 2008 AT 7:59 PM
Tiny
JAMES W.
  • MEMBER
CPS is on the front right side of the engine by the crankshaft pulley. The mounting bracket is held to the engine by two 6MM bolts. It is easier to pull the sensor bracket and all, then change the sensor. Make sure the bracket and mounting space on the engine are nice and clean before you reinstall.
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Saturday, November 22nd, 2008 AT 11:20 AM
Tiny
BENTLEY EVERSLEY
  • MEMBER
Hi James, it's been a while but I still have the no start problem with my 1987 Jag. I went a head and replace the interia switch and the ignition relay under the dash, by the fuse box. I could'nt find the crankshaft position sensor, are you sure the car has one? By the way if I spray either into the throttle body the car starts right up and dies when the either burns off. What I'm looking for is what ever turns the fuel pump and the injectors on? Thats where my problem lies. Can you send any electrical diagrahms for the fuel and ignition systems? Also if I put power directly to the fuel pump it comes on and I install a noide light attach to one of the injectors and crank the motor I don't get any pulse from the injector. If this helps any. Thanks in advance for all your help in ths matter.
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Monday, December 22nd, 2008 AT 5:59 PM
Tiny
JAMES W.
  • MEMBER
Do you have, or have access to, a fax #? I can download the diagrams, but they are so compressed they are hard to read. If you can get me a fax # I'll ship some diagrams to you. Please advise. Also, '88 was the first year they used a CP sensor, I thought it was '87. I stand corrected.
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Friday, December 26th, 2008 AT 9:25 PM
Tiny
BENTLEY EVERSLEY
  • MEMBER
Hi James, My wife has axcess to a Fax machine at her job. Can you fax any wiring diagrahams for the Fuel pump and the Injectors for the 1987 Jaguar xj6 I narrowed things down to what ever control the Fuel pump and the Injectors to come on is not doing that. By the way my wife's fax number is 704-316-3026 and put Attention Emma. Thanks in advance for all your help in this matter.
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Sunday, December 28th, 2008 AT 8:52 PM
Tiny
JAMES W.
  • MEMBER
Fax is on it's way.
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Sunday, December 28th, 2008 AT 10:07 PM
Tiny
BENTLEY EVERSLEY
  • MEMBER
Hey James, I receive you fax yesterday, haven't had time to look it over as yet, but I will keep you informed as to the outcome. Thanks so very much for all you help.
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Tuesday, December 30th, 2008 AT 10:54 PM
Tiny
JAMES W.
  • MEMBER
Thanks for the comeback. Let me know what you find.
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Wednesday, December 31st, 2008 AT 12:04 AM
Tiny
BENTLEY EVERSLEY
  • MEMBER
Hi there Jim, latest update. I looked over the wiring diagrahm you faxed me via my wife. I spent the entire weekend checking for shorts and bad grounds from the computer to the injectors, to the injector resister and just about all wires from the front of the car all back to the computer. No luck as yet, fuel pump still not getting power and the injectors still not firing. I know the answer is near at hand, I just can't put my finger on it. I appreciate your time and information, Thank you so very much.
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Tuesday, January 13th, 2009 AT 10:02 PM

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