1987 Jaguar XJ6 Car would'nt start

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.

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.

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?

To whom it may concern, I'm getting a spark but the fuel pump is not comming on.

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

Hi Jim, sorry I don't have access to a fax machine,but I do have a printer.

Let me see what I can put together. I'll try to get back to you today.

did u check the interia cut of swich?
if may be bad or going bad

IF your jag has it, it

should be in the spot marked

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.

The enertia switch should be pushed "down" to be reset. Don't forget about the CPS.

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.

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.

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.

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.

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.

Fax is on it's way.

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.

Thanks for the comeback. Let me know what you find.

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.

Check the "ballast coil relay" on figure 1 of the diagrams to see if it's closing. What I have done in the past is pop the plastic cap off the relay so you can physically see if the relay is working. Makes them a lot easier to test. Both the fuel injection module and the ignition coil get their signal to pulse/spark from the pickup in the distributor. Also, a common failure is the ignition amplifier. I'm going to fax you some more "stuff", attn. Emma. I'll try to get it out yet tonight.

Hi James, you should be getting tired of this Jaguar by now? anyway we are getting the coldest days thus far, in the teens here in Charlotte N.C so I wouldn't be messing with the car the rest of the week. I've got some more test in mind, plus the latest update from you. I will let you know the outcome, also how do I give feedback on all your help given. I'm trying to use my Paypal account to give a donation, but having a little trouble getting things to work thus far.

In the teens, huh? When I got up the morning, it was -24F in Minnesota. Even the dogs won't go out. Anyway, I'm having download problems AGAIN. As soon as I get it figured out, I'll send you some more information.

Hi James, we had a 45 degree day today, so I took advantage of it. I unplugged all the injectors and using a Noide light test the injectors one at a time. I got a faint pulse from each injector. I then went a head and replace the pick-up coil in the distributor and still no power to the fuel pump and faint pulse to the injectors.. I then took the top off the mass air flow meter, sprayed either into the throttle body while the engine was running moved the lever and the car stayed running,till let it go. Problem was a bad mass air flow sensor. turns out that it triggers the injectors and trigger the fuel pump relay. No need to fax anymore
information. also I made a donation to the cause. I'll be in touch from time to time. Thanks a gain for all your help and suport.

Glad to help. Anything else,you know where to find us.