car wont start on 1st try
#1
#2
This happens every time, or only after driving and trying to restart? If after driving, it may be a vapor lock, which would mean you probably have an issue with your charcoal canist/vapor recovery system.
If it happens when cold, can you hear the pump come on and prime when you turn the key before starting? Sounds like perhaps you aren't getting enough fuel and then after a cranking sequence it has enough.
If it happens when cold, can you hear the pump come on and prime when you turn the key before starting? Sounds like perhaps you aren't getting enough fuel and then after a cranking sequence it has enough.
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jxjsv12 (09-02-2018)
#4
- switch on ignition (do not start)
- repeat
- repeat
- Then try to start.
Greg
#5
#6
Just out of curiosity, what time of the day are you trying your first start? I know all of us in the midwest and atlantic coast states have been feeling the heat, but my only experience with vapor lock ('87 V12) have been when it's been run for awhile and then parked for a short period of time. Fixing the fuel rail temperature switch cured those issues, I've not had it happen since. And I've never had it happen on a first start attempt, regardless of the temperature or time of day. Then again, mine is a pre-facelift, so many things may have changed between the model years.
Thanks,
John
1987 XJ-S V12
Thanks,
John
1987 XJ-S V12
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Greg in France (09-04-2018)
#7
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#8
My car does this exact thing, if I crank it for a split second like barely enough to have the starter move then try again it'll flick on like a lightswitch. I would also note that often you can crank away and the engine won't fire up but if you turn the key back while cranking it'll come on as if the car is simply waiting for you to stop using the starter before the engine comes alive. The entire fuel-ignition system is new.
No effect on performance or reliability so I assume it just part of the car's 'personality'
No effect on performance or reliability so I assume it just part of the car's 'personality'
#10
My car does this exact thing, if I crank it for a split second like barely enough to have the starter move then try again it'll flick on like a lightswitch. I would also note that often you can crank away and the engine won't fire up but if you turn the key back while cranking it'll come on as if the car is simply waiting for you to stop using the starter before the engine comes alive. The entire fuel-ignition system is new.
No effect on performance or reliability so I assume it just part of the car's 'personality'
No effect on performance or reliability so I assume it just part of the car's 'personality'
Last edited by JigJag; 09-05-2018 at 06:34 AM.
#11
Just out of curiosity, what time of the day are you trying your first start? I know all of us in the midwest and atlantic coast states have been feeling the heat, but my only experience with vapor lock ('87 V12) have been when it's been run for awhile and then parked for a short period of time. Fixing the fuel rail temperature switch cured those issues, I've not had it happen since. And I've never had it happen on a first start attempt, regardless of the temperature or time of day. Then again, mine is a pre-facelift, so many things may have changed between the model years.
Thanks,
John
1987 XJ-S V12
Thanks,
John
1987 XJ-S V12
Part number would be useful!
#12
Could also be 13, which is a thermal valve controlling vacuum to the LH FPR
Jaguarclassicparts.com
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pete_185
XJ XJ6 / XJ8 / XJR ( X350 & X358 )
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02-19-2018 08:50 AM
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