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1976 Jaguar XJS V12 - engine starts for 3 seconds and stops. It has fuel and spark, why would it be stopping?

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6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: 1989 jaguar xjs v12 fuel mixture

Chances are the coolant temperature sensor or its wiring have failed, or the vacuum line to the MAP sensor is leaky or broken (I believe the V12 in '89 guise uses MAP sensors). The MAP sensor measures Manifold Absolute Pressure. Along with this pressure the ECU looks at engine RPM. It also measures air temperature. Knowing pressure and temperature we know density, and knowing engine speed tells us how much volume of air is going through the engine. All of this together is computed into air mass and is used to calculate how much fuel mass should be admitted. If the vacuum line is broken, the ECU reads less vacuum and produces rich mixture thinking that the engine is under high load.

Posted on Dec 27, 2008

veteran78
  • 4 Answers

SOURCE: XJS V12, 1986. Loses power and splutters on hard acceleration

Most probably is the crank sensor under engine worn out. )0 % trobleshut starts here.
Einar Norway

Posted on Dec 28, 2008

alicantecoli
  • 22095 Answers

SOURCE: 1994 Jaguar XJS Turns over, but won't start

fuel pump

Posted on Jan 10, 2009

  • 57 Answers

SOURCE: No oil pressure what so ever in v12 jaguar

have you tried reversing the pipes and see if that makes any difference other than that there must be a pressure difference between the two pumps try priming the filter with oil before starting.

Posted on Mar 27, 2009

  • 1 Answer

SOURCE: I have a 1986 Jaguar XJS V12. I'm trying to remove

There are two 13mm bolts in the back window under the carpet that have to be removed. Remove the two plastic screws, Remove the carpet and find the two 13mm bolts..

Posted on Jun 25, 2009

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1 Answer

My 1991 XJS V12 has been sitting for 9 months low fuel, added fuel and tried starting, it turns over fine but does not fire, is there a way to check the fuel pump or if gas is getting to the engine?


first check for a spark thats more than likely ok. the most poss cause is the fuel pump. on the the fuel rail there is a pressure test point like a tire valve. connect a pressure test gauge and crank the engine you should get about 28 -36 psi if not the pump is more than likely stuck, try giving the fuel tank bang with your fist with someone cranking the engine remove spare wheel and trim board for access most likely the moisture in the remaining fuel has corroded the pump, good luck

Sep 16, 2016 | 1991 Jaguar XJS

1 Answer

Recently bought XJS V12 with 15K miles; driven only 1K miles since 1993. I drove the car 250 miles the day I bought it with no problems. Since then, it idles well for 30-60 seconds but then stalls.


Check the fuel filter(s). Your long drive may have shaken dirt or old fuel gunk ("varnish") loose and plugged the filter most of the way. Enough fuel gets by to start the engine, but then it starves when you put it under load.

Aug 27, 2016 | Jaguar XJS Cars & Trucks

1 Answer

Qhere do i find the coolant temp sensor an the map swnsor


Jaguar Sensor, XJ6, XJ8, XJS, XK8, S-TYPE, X-TYPE, XJ40 ...

www.jagbits.com/jaguarsensor.php
FITS: 1993-1994 6.0 XJ12 AND 1989-1993 V12 XJS FROM VIN 157118 ON, 1994-1996 6.0 V12 XJS FRONT DAMPER .... LNA1622AA - MAP SENSOR ... C42166-USED - USED SENSOR COOLANT TEMPERATURE FOR FUEL INJECTION

Sep 25, 2015 | Cars & Trucks

1 Answer

Why does idle speed surge?


Thread: 6.0 V12 XJS High RPM When Warm - Jaguar Forum.co.uk

www.jaguarforum.com/showthread.php?t=54266
Mar 3, 2013 - I recently bought a 1993 6.0 V12 XJS and when it is started from cold it runs ... to 1300 RPM so it wants to surge forward when braking which is strange. ...Classics ยท XJS 3.6,4.0,5.3 & 6.0; 6.0 V12 XJS High RPM When Warm ... You might want to adjust the aux (extra) air valve to bring the idle speed down.

Sep 25, 2015 | 1989 Jaguar XJS 5.3

1 Answer

Jaguar xjs 1995 v12 engine lack of power


I would start with a tune up, then isolate any symptoms other than lack of power if it persists, like rough idle, sputtering, jerking, engine trouble codes, etc.

Jul 30, 2014 | 1995 Jaguar XJS

1 Answer

Where is the fuel filter location for a 1994 jaguar XJS 6,0 V12?


next to the tank at the top of the body under neath. or on the updated version engine bay follow the fuel line and it goes into a contaner with 2 pipes on it that is the filter.

Oct 16, 2013 | Jaguar XJS Cars & Trucks

1 Answer

No oil pressure what so ever in v12 jaguar


have you tried reversing the pipes and see if that makes any difference other than that there must be a pressure difference between the two pumps try priming the filter with oil before starting.

Mar 27, 2009 | 1986 Jaguar XJSC

1 Answer

Cant start my 89 v12 xjs


Replace the crank sensor under engine. 90% of the problems is here.
Einar Norway

Dec 13, 2008 | 1986 Jaguar XJSC

1 Answer

1989 XJS V12 furl problem


Obviously, fuel and oil should never be in the same spot at the same time. You have a dead cylinder and maybe a stuck-open injector. The black smoke is from a too-rich fuel mix, so the cheap things to look for are in the fuel injection system. Look at the fuel pressure regulator as well. Good luck, and don't forget to relieve the fuel pressure before you do any work on fuel inj. engines!

Jul 28, 2008 | 1984 Jaguar XJ

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