my mechanic gave up on trying to fix my jaguar.
#1
my mechanic gave up on trying to fix my jaguar.
Hello all, as you have been reading lately, my jaguar XJ8 non-supercharged was having transmission issues, so I went ahead and bought one with 53,000 miles on it and replaced it. After replacing it, however, my mechanic noted that limp mode did not Go away, and that transmission fault Error continued to show on the dash display. After scanning the car with the OBD tool, we found three separate codes, ABS wheel speed, sensor fault, Pedal position sensor fault, and throttle data loss fault. After consulting with some of you, here, and my own research, we concluded that it would probably be best to replace the throttlebody and pedal position sensor. this worked momentarily, before the car went back to limp mode. It has now been almost 5 months since I took the car to my mechanic and he still hasn't been able to figure out what's wrong with it. He even hired two electricians to come to him and try to figure out what was going on, they couldn't figure it out. He blamed it on their inexperience. I have called him today and told him that I will be picking up the car. Before anyone tells me I should give up, no, I'm not. I have a different vehicle that I daily now, and the jaguar is simply a project car now. I have no rush to fix it or sell it. My question is, what do you gentlemen Think could possibly be the issue, an issue so problematic and complex that not even electrician and mechanic can figure it out? There's still quite the possibility that all of the issues may be caused by the ABS speed sensor. any help is appreciated, thanks, eric
#2
#3
The following 3 users liked this post by Jhartz:
#4
Also, none of the codes erased after swapping TB. I'm quite certain this mechanic messed something up while swapping the trans. The c and p codes weren't there before. Maybe somewhere near the J gate?
#5
I just thought of something to check. Sounds like now the car is saying that it can't communicate with the TB at all. Did they attach the metal brackets and install the bolts on the bottom of the TB or did they just leave the whole assembly hanging from the plastic manifold? There's two little metal brackets that are directly above the top two bellhousing bolts. If they thought they needed to remove the TB for access, they may have removed those little brackets depending how they went about it. Did they get put back? They're small, hidden away, difficult to access and so could easily be overlooked during re-assembly. My guess is that without those brackets and the bolts cinched tight, the TB is not well grounded, or maybe not grounded at all. I can imagine the car's computer brain thinking to itself, "Hey, I can't complete a circuit to these critical things so I'm just going into limp mode." I borrowed a picture of an engine for sale off a famous online auction site and circled the brackets in red for reference.
The following 2 users liked this post by pdupler:
Coventrywood (02-23-2024),
ericnunez (02-23-2024)
#6
I just thought of something to check. Sounds like now the car is saying that it can't communicate with the TB at all. Did they attach the metal brackets and install the bolts on the bottom of the TB or did they just leave the whole assembly hanging from the plastic manifold? There's two little metal brackets that are directly above the top two bellhousing bolts. If they thought they needed to remove the TB for access, they may have removed those little brackets depending how they went about it. Did they get put back? They're small, hidden away, difficult to access and so could easily be overlooked during re-assembly. My guess is that without those brackets and the bolts cinched tight, the TB is not well grounded, or maybe not grounded at all. I can imagine the car's computer brain thinking to itself, "Hey, I can't complete a circuit to these critical things so I'm just going into limp mode." I borrowed a picture of an engine for sale off a famous online auction site and circled the brackets in red for reference.
#8
Another vote for codes? Actual numbers?
We just can't help without real information and just repeating what somebody said is of no value?
What codes were present before you replaced the transmission?
Did the code/part number on the transmission match what was originally in the car?
Do you still have the original transmission?
Is your mechanic using SDD as motorcarman ask above?
.
.
.
We just can't help without real information and just repeating what somebody said is of no value?
What codes were present before you replaced the transmission?
Did the code/part number on the transmission match what was originally in the car?
Do you still have the original transmission?
Is your mechanic using SDD as motorcarman ask above?
.
.
.
#9
Finding a competent mechanic for these complicated cars is a daunting task. Finding one willing
and capable enough to chase down a communication problem without charging more than the car
is worth would be phenomenal! Our choices narrow to becoming more knowledgeable toward the
systems employed or replacing our beloved Jaguars with something different. The problem with
the latter is, of course, a whole new and unfamiliar territory of issues which may not be as well
supported as they are within this excellent forum.
and capable enough to chase down a communication problem without charging more than the car
is worth would be phenomenal! Our choices narrow to becoming more knowledgeable toward the
systems employed or replacing our beloved Jaguars with something different. The problem with
the latter is, of course, a whole new and unfamiliar territory of issues which may not be as well
supported as they are within this excellent forum.
The following users liked this post:
ericnunez (02-23-2024)
#11
Another vote for codes? Actual numbers?
We just can't help without real information and just repeating what somebody said is of no value?
What codes were present before you replaced the transmission?
Did the code/part number on the transmission match what was originally in the car?
Do you still have the original transmission?
Is your mechanic using SDD as motorcarman ask above?
.
.
.
We just can't help without real information and just repeating what somebody said is of no value?
What codes were present before you replaced the transmission?
Did the code/part number on the transmission match what was originally in the car?
Do you still have the original transmission?
Is your mechanic using SDD as motorcarman ask above?
.
.
.
#12
Might be a shot in the dark but the wheel sensor may be the underlying issue. Might as well change the rear ones to see if it make a difference; or change them both. This site had a two pack for less than $20. Easy to swap and even easier if you remove the wheels.
https://www.amazon.com/Premium-Senso.../dp/B0C99122DS
Cheers!
https://www.amazon.com/Premium-Senso.../dp/B0C99122DS
Cheers!
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