Question about 1994 Jaguar XJ6

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No spark, only 7.5v on coil +ve.Starts with ext.12v supply.

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Measure battery voltage when cranking, if below about 10v then could be the problem. Not enough information for a full diagnosis, so presume the ext 12v supply was on the coil? Try this diagnosis procedure: Put voltmeter on battery + and on to coil + and measure volt drop when cranking. It should be small. Keep voltmeter on coil and keep probing all the way back through any points you can get to the coil wire until you get to the ignition relay, keep checking volt drop until you get to the ignition switch. You should be looking at a fraction of a volt all the way until there. If more, you have a dodgy connection or relay. Sometimes, easiest way is to rewire from where you know there is a low volt drop as finding a broken cable in a wiring loom is nigh impossible. I've had to do this a couple of times before on my classic cars.

Posted on Jul 31, 2009


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I guess the question is, how do I fix my problem. My problem is, I can get the truck to start-up. But it won't stay running. It only 'runs' for like 1-2 seconds. What do I do?

Hi Mathew

Dont know your car or model.

But.... Some info may help.
Ignitions systems apply 12v to Start motor & often supplies 12v around a resistor (wire) to boost 12v to the coil then the ignition key rotates back to another position. Run.
This connects 12v to the ignition system / coil through a resistor to the ignition coil (reduced) to run the vehicle.
This is how older models worked.
So... The ignition key run position may not be providing 12v to the ignition circuit. Car Stalls untill restarted.
Use a 12v test light or multimeter to test primary side of spark circuit.
Newer models may not use these methods any more.


Apr 20, 2016 | Cars & Trucks

1 Answer

How do I fix no voltage to fuel pump.

Sounds like relay ground is bad. If supply 12V to relay and meter to ground, you see the 12V potential. If you meter the other side of relay to ground and see the 12V potential, then ground is not connected to that side (but your relay coil is good).

Feb 07, 2015 | 2002 Nissan Sentra

1 Answer

Wiring diagram

Sorry, don't have a diagram; but:-
The +12V supply end goes to an "+12V when Ignition on" source.
Note that the positive side of the coil also connects to "+12V when Start" source, to ensure maximum supply voltage to coil while cranking engine.

Sep 13, 2009 | 1994 Dodge Colt

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I disconnected the coil packs and after i reconnected them the car wont start back up, what can it be?

If the car starts before disconnecting the coil packs, it might be the ground connection, have it checked. Check also the connections and the terminals if they are loose.

Jul 30, 2009 | 2003 Nissan Altima

2 Answers

Ignition Problems on 86 Jeep CJ7 No Spark From Coil??

check to see if u have 12v at the pick up coil in the dist. if not thats ur prob. my 81 cj7 304 v8 did it

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1 Answer

No spark at sparkplug

sounds like either a cam sensor or crank sensor. try crank sensor first.

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