X350 XJ- air suspension issues
Discussion
Car is in for its MOT and has an issue after replacing the rear offside shock due to it shearing from its bottom mount. Went with a used shock from a well known Jag breaker.
Having bother getting the offside to rise. There was a physically damaged suspension sensor on the rear offside that's now been replaced but the issue is still present. Mechanic has given me this tonight after the replacement sensor hasn't immediately fixed the issue (my question in bold)-
New sensor on.... same problem. Voltage at both sensors is the same ... height readings are different which would tell me they are giving correct signal as one side is higher ....... removed air pipe from front offside shocker which drained air from nearside and the car fully sat on its arse (so nearside and offside air feeds are therefore linked) ...... reconnected offside front air pipe..... started car...... pump kicked in...... only raises nearside. Can't hear any air leaks from the car or the replacement shocker. Kinda close to stumped by this !! Not one for giving up easy though .
The sensor that was swapped is defo worse for wear so that was needing changed anyways. The thing that's throwing me is that it's got voltage readings from both rear sensors now of 4.9v the fact that the nearside will rise from fully deflated tells me the voltage is correct. However if they're independently left and right sided why does the nearside drop if you disconnect the offside front air line yet the offside doesn't inflate when the nearside does as they must be linked somehow to deflate from opposite side
So does the front offside rise at all or has it always sat low since swapping out the shock?
Low at offside since swapped the rear shock ...... pull the air line from offside front shock..... nearside front and rear drops on its arse...... re connect pipe and start the car...... nearside front and rear rises only. Its a head scratcher.
Having bother getting the offside to rise. There was a physically damaged suspension sensor on the rear offside that's now been replaced but the issue is still present. Mechanic has given me this tonight after the replacement sensor hasn't immediately fixed the issue (my question in bold)-
New sensor on.... same problem. Voltage at both sensors is the same ... height readings are different which would tell me they are giving correct signal as one side is higher ....... removed air pipe from front offside shocker which drained air from nearside and the car fully sat on its arse (so nearside and offside air feeds are therefore linked) ...... reconnected offside front air pipe..... started car...... pump kicked in...... only raises nearside. Can't hear any air leaks from the car or the replacement shocker. Kinda close to stumped by this !! Not one for giving up easy though .
The sensor that was swapped is defo worse for wear so that was needing changed anyways. The thing that's throwing me is that it's got voltage readings from both rear sensors now of 4.9v the fact that the nearside will rise from fully deflated tells me the voltage is correct. However if they're independently left and right sided why does the nearside drop if you disconnect the offside front air line yet the offside doesn't inflate when the nearside does as they must be linked somehow to deflate from opposite side
So does the front offside rise at all or has it always sat low since swapping out the shock?
Low at offside since swapped the rear shock ...... pull the air line from offside front shock..... nearside front and rear drops on its arse...... re connect pipe and start the car...... nearside front and rear rises only. Its a head scratcher.
Edited by Patrick Bateman on Wednesday 20th January 21:10
Edited by Patrick Bateman on Wednesday 20th January 21:11
Anyone?
Still no joy. Garage are getting help from another local auto electrician who are known to be good.
Everything points to the hardware having the capability to work as it should, i.e. no air leaks etc.
The readings on the height sensors look to tie in with what they actually have as well, i.e. nearside with a high reading and offside with a low reading.
Seems very strange when you see posts about just driving it to sort it. He'd had the entire car sitting low at one point and the nearside rises no problem on start up.
Still no joy. Garage are getting help from another local auto electrician who are known to be good.
Everything points to the hardware having the capability to work as it should, i.e. no air leaks etc.
The readings on the height sensors look to tie in with what they actually have as well, i.e. nearside with a high reading and offside with a low reading.
Seems very strange when you see posts about just driving it to sort it. He'd had the entire car sitting low at one point and the nearside rises no problem on start up.
Get over to www.jaguarforum.com , register then post the question. Guarantee someone will have the answer.
Ive saved thousands of ££ over the years by using this forum .
Ive saved thousands of ££ over the years by using this forum .
I was afraid someone might say that. Already got a thread going there. 
https://www.jaguarforum.com/threads/rear-shock-won...
https://www.jaguarforum.com/threads/rear-shock-won...
The mechanic is weary of driving it much, the mud flaps are near enough scraping the ground as it is and the surrounding streets aren't the most flat.
Also, if that's all it needed, why, after totally draining the system, would the nearside rise again on engine start-up without any issue?
Also, if that's all it needed, why, after totally draining the system, would the nearside rise again on engine start-up without any issue?
I suspect its a compressor issue and its not rising because its been sat too long , from memory around 220psi is where it should be . there isnt actually a lot in the system to go wrong , 4 sensors , a pressure sensor to the reservoir , a compressor and the respective spheres which I doubt will be punctured .
Edited by reddiesel on Saturday 23 January 20:00
Not sure I follow the reasoning there.
How do you mean sat too long? They swapped out the nearside rear shock out. It hadn't been sitting low for long.
The compressor is only there to keep the pressure at the required value. It works and raises the nearside of the car immediately after being fully drained so surely that points towards the fact the air isn't being directed to the offside, no?
How do you mean sat too long? They swapped out the nearside rear shock out. It hadn't been sitting low for long.
The compressor is only there to keep the pressure at the required value. It works and raises the nearside of the car immediately after being fully drained so surely that points towards the fact the air isn't being directed to the offside, no?
For me I am not sure the reservoir is being filled to its capacity . Have you calibrated this new sensor with the JLR SDD ? I would de pressurise the system completely by breaking one of the joints near the ballast tank , I would disconnect the battery and touch both leads together for 10 seconds initiating a hard reset . I would make the joint back up , reconnect the battery and start the car driving it for around 20 minutes if possible and see where that left me .
Patrick Bateman said:
I was afraid someone might say that. Already got a thread going there.
https://www.jaguarforum.com/threads/rear-shock-won...
Try https://jagchat.net/https://www.jaguarforum.com/threads/rear-shock-won...
ETA: Somebody has already posted there on your behalf.
https://jagchat.net/thread/2600/x350-air-suspensio...
Edited by Sahjahd on Sunday 24th January 06:39
I dont know your history with the car , whether you are a Jaguar Enthusiast or perhaps have possibly bought it cheaply and are chancing your arm on a bit of luxury at perhaps a budget price , I mean no disrespect with my latter comment as plenty do . These models are getting on a bit now and I think a relationship with a good Jaguar Independent is a handy thing to have . The necessary software you can easily pick up yourself , many of the lads on the Forums have them and would be glad to help depending obviously on where you are in the Country . The Hard Reset is indeed a common thing to do for any number of things , under no circumstances go on a wild goose chase renewing parts at the suggestion of a garage because frequently you end up with an empty wallet and the same issue present . The X350 is a fine car with any issues well known and relatively cheaply sorted , its just difficult diagnosing solutions online without the proper diagnostic equipment being used . Inevitably you end up with solutions as diverse as water in the boot to creases in the rubber suspension spheres . Im intrigued by this periodic warning light you spoke about on another Forum , you may of course have remedied this with with the replacement of the sensor . How are the earth posts within the front wings , these can cause no end of issues , even if they look ok visually the mere placing of a spanner on them is often enough to have them shear off in your hand
Thanks for that but looks like I'm a distance away from him? Who is the 'fat bloke from North of the Border' you refer to?
There aren't really any Jag specialists in the area unfortunately,
Do you know of any good sources for the proper software/cable required? FYI I'm no stranger to the pitfalls of more complex machinery but it's usually in BMW form so I'm used to more specialists and diagnostic software options.
There aren't really any Jag specialists in the area unfortunately,
Do you know of any good sources for the proper software/cable required? FYI I'm no stranger to the pitfalls of more complex machinery but it's usually in BMW form so I'm used to more specialists and diagnostic software options.
Patrick Bateman said:
Didn't realise I never updated this and came across the thread at MOT time just now...turned out the issue was the replacement shock from the breakers the whole time!
Took the Jaguar specialist with the right software and a spare shock sitting around to confirm it.
Good news and hopefully not a lot of money .Took the Jaguar specialist with the right software and a spare shock sitting around to confirm it.
There are problems with speed bumps all over the country .
Now I don't have to worry . Even with the system working as it should there were always scraping over bumps in a private park where we live . (Liverpool) what are the" in the middle of the lane bumps " supposed to do? Rip out your sump .
These road council engineers want to wake up .
Now I don't have to worry . Even with the system working as it should there were always scraping over bumps in a private park where we live . (Liverpool) what are the" in the middle of the lane bumps " supposed to do? Rip out your sump .
These road council engineers want to wake up .
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