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1992 Jaguar Vanden Plas 92 jag with issues

Tiny
SHAWNCANADA
  • MEMBER
  • 1992 JAGUAR VANDEN PLAS
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 142,000 MILES
I have a 92 jag vandenplas I have giving it a tune up changed the oil put a new alternator in. Now I have bigger problems the car doesn't like to accelerate well at least not fast. It will if you hit the accelerator real slow. If you try to accelerate to fast it will pop through the air cleaner. Next the car has great oil pressure for like the first 30 minutes it doesn't matter how you run it its fine after that it starts going down fast and will eventually go to nothing at a idle when you rev it up it goes back to a descent psi then comes back down but it takes like 30 minutes to 45 minutes for this to happen I haven't changed the sender yet I need to know if this is common or do you think I have bigger problems thanks. Ps. When the pressure gets low it still sounds and runs fine.
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Thursday, January 29th, 2009 AT 3:29 PM

4 Replies

Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,
I would concentrate on the oil pressure problem first, get the pressure tested with a mechanical gauge as this will give you a true indication as to engine oil pressure, you may just have a faulty sender or an electrical issue, if there is no noise with the low indicated pressure I feel that it will be a sender problem, sort this first and then re post and we will look at the tune issue.

Mark (mhpautos)
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Thursday, January 29th, 2009 AT 3:41 PM
Tiny
SHAWNCANADA
  • MEMBER
  • 5 POSTS
Thank you for the info the oil pressure seemed to straighten out with my voltage issue but now the car is not wanting to run I think the mass air flow isn't working correctly if you take the air filter off it will idle sometimes and if you use your hand as a choke it will accelerate but most of the time it just don't want to run it will start, idle real low to wear it stalls and wont go past 2,000 rpms and you cant give it hard acceleration or it will stall you have to ease on the pedal to get it to move
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Sunday, February 1st, 2009 AT 5:30 PM
Tiny
MHPAUTOS
  • MECHANIC
  • 31,938 POSTS
Hi there,

I would start off with a scan to check for any set fault codes, you may well have a faulty MAS but best to start with the basic checks first.

Mark (mhpautos)
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Monday, February 2nd, 2009 AT 1:38 AM
Tiny
MRPEB
  • MEMBER
  • 2 POSTS
You also have to reset the ecu after the generator change. It seems the engine is in limp home.
To do this turn ignition on(do not start) remove the red 5amp fuse in the centre fusebox( in the arm rest) wait until the dash meter needl drops to zero. Turn key off replace fuse and start again. Very often this might help.

Suc6
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Monday, June 1st, 2009 AT 5:33 AM

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