Hi Everyone. I bought an 85 Jag xj6 series 3 about 5 years ago, was in really good shape. Have had a few problems over the years but nothing major until now, I have a crank but no start condition. I have spark, fuel, and injectors fire. The tach barely moves when cranking but oddly enough the speedometer climbs to about 80 mph, never seen that happen before. My question is, does this 85 xj6 have a crankshaft position sensor and if yes where is it located? Great info on this forum thanks to all of you.

 

Hi!

No crank position sensor.

Weird speedo activity suggests lack of voltage or poor ground; somewhat common. May/may not be related to your no-start condition

When you say you "have fuel", does that mean you checked the fuel pressure? If so, what is it?

Cheers
DD

 

Hi Doug
I did check the fuel pressure and it is about 36 psi. I had replaced the coil the other day due to no spark and it was trying to start but wouldn't fire up. Yesterday I just kept cranking and cranking it and slowly it started up and run rough and then it suddenly leveled out and ran smooth. It was like something was blocking it and then it suddenly cut loose and ran. Let it run for a while then shut it off then started awhile later and it seems to run ok now. Thanks for the reply Doug, was very helpful.

 

Why is not for us to reason why, but only to do!! Rudyard Kipling, and Gungha Din , A Brit !
And, it is a Brit car!!!.

Reality:. It flooded with fuel on cranking with no spark. continued cranking with spark cleared itr and it ran!!!

Either way, it is what it is, good.,

Carl

 

Sounds like a fuel filter... it may struggle again. Have you replaced it?

 

I'm with Carl on this one. A lot of cranking without the engine firing up will load the cylinders with too much fuel. If, after repeated cranking, you get a cylinder or two to start firing, it usually will clean up and run normally. Back in the carburetor days, the method to clear a flooded engine was to hold the gas pedal to the floor and crank until it started firing. The trick was to back off the pedal quickly to half or quarter throttle when it seems like engine will come to life. This same method can be used on GM fuel injected engines of early 2000's vintage, I would think this ability is common, but most people don't think about it.

Dave

 

I think you, Rudyard and Gunga Din are right, "Don't ask why, just keep it simple". Thanks Carl and have a great day.

 

I think you, Rudyard and Gunga Din are right, "Don't ask why, just keep it simple". Thanks Carl and have a great day.

 

You're right Dave, I remember the good old carburetor days, I just didn't connect it to fuel injection. I should have realized it when I sprayed starter fluid in the mass air sensor and it didn't fire. Thanks for your reply Dave.