Engine won't crank
#1
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Hi. So long since I have had any problems I couldn't fix, but this one has stopped me. I went to start my car yesterday but the engine wouldn't crank over. Silence. No red backlight in P or N, but red light back lit for R and D. The gear stick will shift out of Park, and a light tap can be hears behind the dash as the start only in Park switch is activated and the gear stick moved in and out of Park. I've had the ski slope off, and nothing suggests the switch is loose. Should there be any sign/tap from the relay behind the L/H headlight when the ignition switch is turned to start? I charged the battery up, so it's not that. All advice appreciated.
#2
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Hi. So long since I have had any problems I couldn't fix, but this one has stopped me. I went to start my car yesterday but the engine wouldn't crank over. Silence. No red backlight in P or N, but red light back lit for R and D. The gear stick will shift out of Park, and a light tap can be hears behind the dash as the start only in Park switch is activated and the gear stick moved in and out of Park. I've had the ski slope off, and nothing suggests the switch is loose. Should there be any sign/tap from the relay behind the L/H headlight when the ignition switch is turned to start? I charged the battery up, so it's not that. All advice appreciated.
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Don B (08-06-2019)
#3
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Don B (08-06-2019),
Grant Francis (08-06-2019)
#4
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NO Red P or N, NO start.
The Linear switch has died.
Both mine did that, and the XJ6 responded to a good clean and light relube. The R, nope, new switch from SNG in the UK.
Sometimes, working the lever all the way thru the all the gates, including the :"j": section will revive it for a short time, but not always.
Good luck
The Linear switch has died.
Both mine did that, and the XJ6 responded to a good clean and light relube. The R, nope, new switch from SNG in the UK.
Sometimes, working the lever all the way thru the all the gates, including the :"j": section will revive it for a short time, but not always.
Good luck
#5
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Hi Jens boy,
If you're asking about the XJR, your Park-Neutral start-inhibit function is in the linear switch as Graham mentioned. If you're inquiring about the normally-aspirated X300, it will have the ZF 4HP24 transmission and your Park-Neutral start-inhibit switches will be in the rotary switch on the left side of the gearbox. A good maintenance item is to disconnect the main electrical connector at the rear of the transmission and flush both halves with zero-residue electronic cleaner. Oil contamination can wreak havoc with transmission communications.
Also check the gear selector cable where it connects to the rotary switch. The cable is known to stretch, and the right-angle fitting that connects the cable to the rotary switch is known to corrode and develop slop. The ball of the ball-and-socket joint can become so loose that it pops out of the socket.
If neither of the above corrects the issue, the cover of the rotary switch can be removed and the gold pads can be cleaned with a soft pencil eraser and electronic cleaner.
Cheers,
Don
If you're asking about the XJR, your Park-Neutral start-inhibit function is in the linear switch as Graham mentioned. If you're inquiring about the normally-aspirated X300, it will have the ZF 4HP24 transmission and your Park-Neutral start-inhibit switches will be in the rotary switch on the left side of the gearbox. A good maintenance item is to disconnect the main electrical connector at the rear of the transmission and flush both halves with zero-residue electronic cleaner. Oil contamination can wreak havoc with transmission communications.
Also check the gear selector cable where it connects to the rotary switch. The cable is known to stretch, and the right-angle fitting that connects the cable to the rotary switch is known to corrode and develop slop. The ball of the ball-and-socket joint can become so loose that it pops out of the socket.
If neither of the above corrects the issue, the cover of the rotary switch can be removed and the gold pads can be cleaned with a soft pencil eraser and electronic cleaner.
Cheers,
Don
Last edited by Don B; 08-10-2019 at 09:34 AM.
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Grant Francis (08-06-2019)
#6
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![](https://cimg1.ibsrv.net/gimg/www.jaguarforums.com-vbulletin/1999x1220/x300_starter_circuit_b91baa84533e073f38eae4a225eff969818cdaba_fca9031800ddc4aa514897d9a4f45b56dcc46b10.png)
The Starter solenoid relay is looking for a ground command to close the power contacts
This closes the power contacts in the solenoid so the big power will rotate the starter colored in Red in the pic
This ground path is colored in Blue in the pic
Easiest thing to check is if the starter solenoid relay clicks with your finger on it and not just listening as others in the area
Even though it may click correctly doesn't mean the power contacts in the relay are good enough to carry the needed current for starter operation
See page 17 and 20 of the doc below
You can swap this relay with the Fog light or headlights relay
The rotary switch on the underside of the car left side transmission body ins delicate fingers on it that can get contaminated
Cleaning the contacts is no problem but resealing it with the old expanded o - ring is problematic
Suggestions welcome
Note : check that the 2 terminal nuts on the fuse link just fwd of the battery positive post did not come loose , these 2 nuts are in the box going down
![](https://cimg2.ibsrv.net/gimg/www.jaguarforums.com-vbulletin/640x448/25e89db140cb8db55806ba6337aa_39e92e5a60b59abddcbc186d59981258263b1b94.jpg)
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Editing
Last edited by Lady Penelope; 08-07-2019 at 12:42 AM.
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Don B (08-14-2019)
#7
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Thanks for all your advice. I decided to try for power to the starter motor solenoid. Not much room, I'd hate to have to change the starter motor. However, after fiddling around with the white wire where I could, I absent mindedly turned the key and the motor fired up. I tried it a few more times to make sure. I think there was a dry joint or some corrosion that I disturbed with my fumbling. Thanks all.
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Don B (08-14-2019)
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#8
#9
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Behind the valve cover with the 3 connectors and the water intrusion with the 2 being the rear O2 sensors I found my O2 sensor connectors green and corroded and later cleaned
A lesson in a 20 + year old car clean up to bringing it running like a top
There was a mod somewhere along the way of relocating the 3 connectors
I think mine was already done
Never underestimating the value in fiddling to cleanse it of issues
Power to the White solenoid wire rocks in your quest to be a Jaguar problem solver
A lesson in a 20 + year old car clean up to bringing it running like a top
There was a mod somewhere along the way of relocating the 3 connectors
I think mine was already done
Never underestimating the value in fiddling to cleanse it of issues
Power to the White solenoid wire rocks in your quest to be a Jaguar problem solver
Last edited by Lady Penelope; 08-14-2019 at 03:02 AM.
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