Hello new to the site as not sure if this is the best place to post but the 10amp ignition coil fuse blows as soon as I insert it into the fusebox have tried with coils unplugged and in the same result any ideas it’s a 98 xk8 4l convertible any help appreciated

 

Welcome to the forums Jon,

It is exactly the right place to post the question.

There's two 10 amp fuses protect the ignition coils in the 1998 XK8 and both are located in the LH engine compartment fusebox:

Fuse #14: HO2S heaters (where fillted), EGR valve (where fitted), ignition coils relay, throttle motor relay, AC compressor clutch relay
Fuse #18: ignition coils supply

Which one is blowing?

Graham

 

Sorry it’s the throttle motor fuse 9 just assumed the ignition because it’s not starting read the fuse plan wrong

 

please ignore this getting myself in a muddle will post correct info in a minute

 

It’s fuse 9 but it’s the security sounder according to the manual would this stop the car starting

 

Jon,

I never had any problems with the security sounder on either of my XK8's but I recall other members have posted about issues with it. As you've now identified the problem is not ignition coil related (the thread title), I recommend starting a new "Security Sounder" thread with the relevant checks you've carried out so far. This will attract the attention of members with relevant experience.

Graham

 

Thank you for your help

 

Working on my 99 XK8 at the moment. Pulled fuse 9 in engine bay fuse box (LHS), car started no problem.

 

Thanks for that must be something else then didn’t know if they were related

 

By 'won't start', do you mean that the car will crank but not fire, or that it won't crank?

The security sounder (or lack of) will have no bearing on this issue.

 

Will crank every now and then will try to go but doesnt

 

Just to be clearer is does crank. Then every now and then will try to go but never quite gets there

 

OK, you have at least some form of a spark if it's trying.

Has the car been standing for some time until now?

Do you have fuel pressure at the valve on the fuel rail? There's a schrader valve (mine is covered with a blue cap) at the front of the engine on the LHS fuel rail. You will see it if you remove the LHS engine cover. If you turn the ignition on for a few seconds and then off, you should get a good spurt of fuel out by depressing the valve. Cover with a rag or something to stop it spraying everywhere.

See this thread by member Johnken for pictures of where to look, and further information:
https://www.jaguarforums.com/forum/x...1/#post2204864

 

Yes been standing at least nine months and no spray of petrol

 

Ecch. Likely the fuel pump has gone bad - they need to be exercised regularly. Unfortunately, its replacement isn't particularly easy on the ragtops. It may be a small consolation that a member not too far from you is going through similar pain:
https://www.jaguarforums.com/forum/x...6/#post2251500

Very slim chance it's a blocked fuel filter, but...

Do you hear the pump run for 2 seconds or so when the ignition is turned on?

 

Not sure to be honest will get someone to look at it tomorrow thanks for your help on this I will check both the pump and failing that the filter tomorrow will read the other thread

 

Just grabbed the neighbor turned ignition on and they was like a click / whirr from the boot only for about a second if that when I crank there is a sstrong smell of petrol in the boot

 

Like Michaelh pointed out, the whir may be the fuel pump pressurizing. A fuel filter costs a couple of dollars, 20 minutes to install. WTH, change yours, pray its solid. I hope you get lucky!

This wouldn't have anything to do with the smell as far as I know, but 1 thing at a time.
John

 

Thank you I’ll try that first relays are all good no fuses blown are there any other reasons I wouldn’t get fuel to the rail

 

If the filter is blocked it won't do any good to either the pump you have now or any replacement.

Do the easy stuff first and report back.

Good luck!