Hi guys im hoping someone will be able to help me.

I have a 1996 XJ6 3.2 ive been doing work on it as i got it as a non runner. Its started fine but i turned it off last night now it wont start at all!! Its turning over but just not firing, im suspecting a fuel blockage or something.

If anyone could have some idea what i could try it be much apritated

Kind regards
Dave

 

hi,
your car is a X300, not the Series 1, 2, or 3 XJ-6.

you might post to the X300 forum for more experienced help, but you could have a bad Cold Start Injector, Fuel Pump, Fuel Pump Relay, or Fuel Regulator. Best to check with those who have the same car. At least the engine is turning so it should be easy to repair.

 

Welcome to the forum Dave,

I've moved your question from XJ6 & XJ12 Series I, II & III to X300 forum. Members here with the same model will be able to help.

When you get a minute, please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

Hi Dave,

Welcome to the forum. Sorry to hear about your issues, but usually a no-start is caused by something simple, especially after the car has been running fine.

Two of the most common causes are a weak battery or a failing crankshaft position sensor.

If the battery voltage drops to between 10V and 11V while cranking, the Engine Control Module will not trigger the ignition, and your car will not start even though it cranks and cranks. The battery may measure well under no load, but its power delivery may be insufficient to satisfy the ECM. Jags need a strong, healthy battery.

If, while cranking, the tachometer shows 0 rpm, the most common cause is a failing crankshaft position sensor (CKPS), which is mounted on the front of the engine to sense the teeth in a reluctor ring on the crankshaft. The ECM uses the CKPS signal to adjust ignition timing, so if the CKPS signal is missing or implausible, the ECM will not start the engine.

If you have a decent voltage/ohmmeter you can check the battery to see if its voltage is sagging while cranking the engine.

The tachometer test is easy - just watch to see if the tach reads about 200-250 rpm while cranking. If it reads 0, replace your CKPS. All Jag parts specialists carry the CKPS, but most local auto parts stores such as O'Reilly can get one for you within a day. I carry a spare CKPS in the trunk of our '93 because it is such a common failure point.

Please let us know if all seems well with the tach and battery tests and we'll move on from there.

Cheers,

Don

 

Hi Don thank you i will replace the sensor and see how i get on, the rpm stays at 0 and the battery charge level goes into the red. Is the sensor easy to replace?

 

About 10 min. if nothing is corroded.

 

Hi again,
The crankshaft sensor is removed and the new one in the post so will keep you guys posted :-)

 

Hi again i have replaced the crank sensor and still nothing also fitted new battery. The rpm is still staying at 0 while cranking and the battery charge still drops into the red. Im really at a loss

 

Hi Dave,

I'm sorry for your continued no-start. I would recommend disconnecting the fuel line at the inlet to the fuel rail (on top of the engine closest to the firewall), holding a suitable container at the fuel line to catch fuel, then cranking the starter to ensure that fuel is flowing from the fuel line. If not, there is a problem with the fuel pump circuit (not necessarily the fuel pump itself).

If fuel is being delivered to the fuel rail, reconnect the fuel line to the rail, then pull one ignition coil and remove the spark plug from that cylinder. Insert the plug into the coil and position the plug so that its ground electrode is near a metal part of the engine so it will be grounded. Crank the engine and confirm the presence and color of the spark. If you have no spark then that will help with the further diagnostics.

I don't think your symptoms suggest a problem with the Park-Neutral switch in the J-gate gear selector assembly (I don't think the engine will typically crank at all if it's a P-N switch problem), but it might be worth wiggling the gear lever to ensure it is fully seated in Park, and also trying to start the car in Neutral.

And forgive me for asking such an obvious question, but is there a decent quantity of fresh gasoline in the fuel tank?

Cheers,

Don

 

Hi thank you for the further assistance. There is 4 gallons worth of fresh fuel. There is no fuel coming from the fuel line when i crank it. Im not very mechanical so bear with me while i try and follow ur instructions

 

Attached is a photo of my trunk fuse box - would anyone say theres anything not right with the relays?