New member, having injector problems / 1991 XJS 5.3 V12
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Junior Member
Joined: Jul 2018
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From: Atlanta, Ga
New member, having injector problems / 1991 XJS 5.3 V12
I am having problems that no one can seam to pinpoint with a 1991 XJS 5.3 V12 marelli ignition.. Have 39psi fuel pressure / have fire to both coils, distributor, all the plugs, and all injectors on the B left bank. There is 12 volts to the A right bank but no injector is firing. All of the left bank (B) are firing. Will try to start if you spray starting fluid to the right bank. Have changed both ECU. Changed the power resistor. swap the marelli amplifiers. I am thinking it is in the wiring harness. Sure would like some input. Thanks Harold
Veteran Member
Joined: Mar 2008
Posts: 25,528
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From: Pacific Northwest USA
Failures of the injector harness are common; to the extent that many replace the harness on general principles before an actual symptom ever appears. I wouldn't be surprised if replacing it fixed your problem....especially in light of the other work done which narrows down the alternatives.. Many owners build their own harness but new ones are out there.
Cheers
DD
Cheers
DD
Joined: Feb 2010
Posts: 28,810
Likes: 11,280
From: Adelaide Stralia
Welcome.
I agree with Doug, and my experience with these bests.
Do that harness, and then tick it off the list of culprits.
BUT
Find the EFI loom plug, usually near the A Bank camcover front edge, unplug it, and replug it, sometimes +, sometimes not.
Do the same with the resistor pack plug, and this sucker is inside the engine bay, on the inner guard, just aft of the RH headlamp binnacle.
The XJS Tech Section will have answers/ suggestions flowing much quicker than from here, so worth a repost.
Good luck.
I agree with Doug, and my experience with these bests.
Do that harness, and then tick it off the list of culprits.
BUT
Find the EFI loom plug, usually near the A Bank camcover front edge, unplug it, and replug it, sometimes +, sometimes not.
Do the same with the resistor pack plug, and this sucker is inside the engine bay, on the inner guard, just aft of the RH headlamp binnacle.
The XJS Tech Section will have answers/ suggestions flowing much quicker than from here, so worth a repost.
Good luck.
Joined: Apr 2012
Posts: 25,844
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From: Summerville, South Carolina
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Joined: Dec 2011
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From: Durham, UK
Welcome to the forum Harold,
Good to have you with us at Jaguar forums.
I think Doug and Grant have nailed the most likely causes. Follow this link XJ XJ8 / XJR ( X308 ) - Jaguar Forums - Jaguar Enthusiasts Forum to the XJS forum for help, advice and information. The 'HOW TO' thread at the top is a good place to start for information on regular issues.
Please remember to add vehicle details to your Signature to help others to give relevant advice. Go to the User CP button on the left of the top menu bar, then Settings & Options under Your Control Panel. Select Edit Signature and enter the details.
You can also visit the US Lower Atlantic Region forum by following this link https://www.jaguarforums.com/forum/usa-lower-atlantic-nc-sc-fl-ga-66/ to find other members in your region.
Enjoy the forums.
Graham
Good to have you with us at Jaguar forums.
I think Doug and Grant have nailed the most likely causes. Follow this link XJ XJ8 / XJR ( X308 ) - Jaguar Forums - Jaguar Enthusiasts Forum to the XJS forum for help, advice and information. The 'HOW TO' thread at the top is a good place to start for information on regular issues.
Please remember to add vehicle details to your Signature to help others to give relevant advice. Go to the User CP button on the left of the top menu bar, then Settings & Options under Your Control Panel. Select Edit Signature and enter the details.
You can also visit the US Lower Atlantic Region forum by following this link https://www.jaguarforums.com/forum/usa-lower-atlantic-nc-sc-fl-ga-66/ to find other members in your region.
Enjoy the forums.
Graham
Joined: Oct 2007
Posts: 121,060
Likes: 6,652
From: PHX some of the time
Welcome to Jaguar Forums Harold,
Good to have you with us.
Enjoy the forum.
If you haven't done so already you should add your car details to your signature to help others to help you.
If you need help with getting around and using the forum follow this link for some help Forum Help
Good to have you with us.
Enjoy the forum.
If you haven't done so already you should add your car details to your signature to help others to help you.
If you need help with getting around and using the forum follow this link for some help Forum Help
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