1988 xjs
#1
1988 xjs
hi. i have a 1988 xjs and am having a difficult time with it. it starts and idles great but after about 5 minutes of driving it will not respond if i try to go over 1500 rpms it bogs down and then surges and bogs and so on.i have replaced the maf fuel filter and checked the fuel pressure whixh is fine.but it hasnt changed anything. i am not getting any codes or warning with the exception of power fluid level low. i cannot figure it out only thing left to do now is maybe the ecu but as i said its not kicking out any codes. does anyone have any ideas as to what the issue may be?
#4
the fuel pressure holds at 55 psi dont know if thats right but thats where it stays at idle and when it messes up.
#5
#6
Where are you measuring the fuel pressure? If you are measuring it before the regulator under the hood, it will be above 100psi. The correct place to measure it is on the left side after the fuel regulator and before the fuel rail. XJS does not have a schrader valve like some other cars to connect a gauge to so you literally have to cut the rubber line, insert a T and check it like that. It should read about 32psi to 33psi at that point. I bought a new hose and replaced it after I was finished re working my fuel system. I considered installing a schrader valve but did not want to add clamped connections.
#7
Kirby Palm's Jaguar XJ-S Help Book
Over 700 pages of XJS help. IIRC the answer is in there, it is divided up into sections.
good luck
Pete
Over 700 pages of XJS help. IIRC the answer is in there, it is divided up into sections.
good luck
Pete
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#8
Kirby Palm's Jaguar XJ-S Help Book
Over 700 pages of XJS help. IIRC the answer is in there, it is divided up into sections.
good luck
Pete
Over 700 pages of XJS help. IIRC the answer is in there, it is divided up into sections.
good luck
Pete
#9
Join Date: Mar 2008
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Does engine temperature have anything to do with the symptom, or just driving time?
If temp sensitive you might also want to check the coolant temp sensor (behind left thermostat) as it plays a major role in cold fueling
i have replaced the maf
Please clarify what you changed here.
fuel filter and checked the fuel pressure whixh is fine.but it hasnt changed anything.
Was the fuel filter clogged? Did you empty it into a clean container? If the contents was brown and cruddy, suspect a rusty fuel surge tank.
Agreed that we need to verify the fuel pressure situation, as mentioned. Regulated 55 psi would be too high. Unregulated 55 psi would be too low
Also, if you have a volt meter you can easily check the throttle position sensor. I can give details or the info is in Kirby's book.
i am not getting any codes or warning with the exception of power fluid level low.
Clarify, please
i cannot figure it out only thing left to do now is maybe the ecu but as i said its not kicking out any codes. does anyone have any ideas as to what the issue may be?
Are we sure we're talking about a 1988 XJS V12? The system didn't use trouble codes or have any form of on borad diagnostics.....so if you have a way of checking for trouble codes, we're talking about the wrong car!
Cheers
DD
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