• Hi Guest!
    You can help ensure that British Car Forum (BCF) continues to provide a great place to engage in the British car hobby! If you find BCF a beneficial community, please consider supporting our efforts with a subscription.
    There are some perks with a member upgrade!
    **Upgrade Now**
    (PS: Subscribers don't see this gawd-aweful banner
Tips
Tips

Jaguar wont start

Share this page

J

jagon

Freshman Member
Offline
I purchased this 1993 Jaguar XJ6 in non running condition.The gas tank literally had over 3 Gallons of water in it.The Gas tank was removed and flushed.fuel pump and fuel filter replaced..Distributor cap and rotor and spark plugs replaced.Still no start.I removed the fuel rail with the injectors attached and plugged the return end of the fuel rail.I cranked over the engine and got No fuel out of any of the injectors (not even a drop).With the injectors out i put a shot of gas in each cylinder and cranked it over.The engine came alive and ran for 2 seconds.Im not a mechanic but i think i got it narrowed down to either an electrical issue to the fuel injectors or the injectors themselves as there was a considerable amount of water pumped through them which cant be good.I checked the electrical resistance of each injector and get 2.4 well within the limits.Thats as far as my Haynes manual will take me and tell me to take it to my local Jaguar mechanic.I just need to know what should the voltage read at the injector connector.Should i take the reading with the ignition in the Start position?Any other suggestions would be greatly appreciated.
Thanks
 
Welcome to the forum, jagon. Great "geo-appropriate" name, BTW! /bcforum/images/%%GRAEMLIN_URL%%/wink.gif

Yin's should check to insure the pump is getting pressure thru the regulator: on the rail at an injector it should be around 25~28 PSI. These systems are also VERY sensitive to poor grounds. Check/clean those too. The injectors are triggered by the ECM in pulses, a test light on the power side of the connector while cranking it should give you a quick-n-dirty way of seeing if they're getting voltage.

Report back! /bcforum/images/%%GRAEMLIN_URL%%/laugh.gif

EDIT: DRAT!!! Missed yin's by a bit! SORRY!
 
There is a one-way valve in the fuel line between the pump and the line thru the filter. If this fails it will take a while for the fuel to reach the rail. Does fuel come thru the rail? Pinch regulator line to tank (rubber hose side)to increase pressure...Have you tried firing the injectors independently? There is a tool for that. You can use some cleaner to clean them while testing each one. Firing of injectors is also thru the crank sensor in front of engine by damper pulley, sometimes the are gummed up with crud and cannot read the actuator. Reached from distributor side on top of damper fastened to front cover. Testing in Haynes is a wisp, but that's all I know without textbook.( Dealer diagnostics). Be careful misting fuel very volatile!
Also, do not remove distributor as it takes a special Jag tool to realign.
 
There will be at least one relay for the fuel pump. Have someone feel the fuel pump for vibration while turning the engine over.

It may be that the relay has not closed providing power to the fuel pump.
 
Replace the crank position sensor on the front of the engine. This is a known high failure part, and it provides the signal to the ECU that the engine is running. It also provides the "firing" signal for the injectors. It may still take a while to clear the water out of the lines and fuel rail. For some reason, the XJ40s are stubborn that way. Good luck. I think that the 93-94 XJ6s are great cars. Don't forget to clear the drain in the fuel filler, the source of the water in the first place....
 
While waiting for the new crank sensor jesseboggan recommended to arrive, unplug it at the connector where it hooks into the wire harness and check for corosion. Even if you don't need to replace the sensor due to corrosion causing the problem, you will eventually. Heat vibration & moisure ruin the sensor in time. My V-12 eats one every 10,000 miles or so, but I have more underhood heat than you do.

Use bulb grease available at Autozone, Pepboys etc. after cleaning the contacts. The connector gets water in it and the corosion causes loss of contact.

Just trace it up from the bottom front of the crank at ther Harmonic Balancer (largest pulley) for about 18 - 24" to find the connector which will be black.
 
Back
Top