I'm planning on pulling out the fuel rail to replace the fuel hoses and it was advised I also remove, clean and test the injectors while I'm at it.

Is this a relatively cut & dried task? If so, what is entailed?

Thanks in advance!

 

Without a injector cleaner and tester, i would say that it's very hard to test them accurately. You can probably actuate them to see if they're firing but you can listen for that while they're on the car. It's probably better to remove them and send them out.

 

Hi Michaem

Its not one of my Favorite jobs, especially if the injectors are stuck in their holes and so could easily take you all Weekend to do, although before you even start you need to get all your 'Ducks in a Row' and have the New Pipes and injector Seals already to go back

Some Shops can charge Megabucks to Test the Injectors and so it could be well worth while to look up the price of either some New or Reconditioned ones

I just took the Fuel Rail out, Tested them while they were still on the Rail and then replaced the Pipes and put them back

Don't get ripped off on the Price of New Seals as I was quoted £24 for 12

And so I went to Brit Parts and got 12 for £5

This was one of the First Jobs that I ever did on my Car and so it made sense that while they were out, I changed all the Spark Plugs as well, which was not exactly what I would call 'A Walk in the Park'

Removing and Cleaning Injectors on my XJS V12

Changing All the Spark Plugs on my XJS V12

 

Removing the injectors is not, IMHO, a hard task, just takes some time to get to them. A good time to replace the cam cover half moons, any cracking vacuum hoses, etc.

Regarding cleaning. Look at post #25. I have used Injector Repair LLC in upstate New York for several of my cars and his prices are the best I found. I second not getting ripped off on the cost of seals. The seals and filters and caps and such are all included in Injector Repair LLCs prices.

Fuel Injector Cleaning and Flow Testing Service. Injector Repair LLC

New 1994 XJS V12 Owner - Page 2 - Jaguar Forums - Jaguar Enthusiasts Forum

 

Wondering if I really need the injectors cleaned. The car hasn't been driven much and was running perfectly last time she was fired up. I just want to pull out those old injector hoses...

 

The hoses should be considered mandatory if you don't know they have been done, the injectors may as well get cleaned or checked over as part of the process, hasn't been driven much would concern me in a country that puts so much into the use of Ethanol which is really really bad in a car that stands.

If you decide to do the hoses get the parts from a reliable supplier - I replaced a bunch of hose on a Nissan and that failed after 2 years as the R9 hose wasn't - there is a lot of fake stuff out there don't be fooled by trader claims and buy brand name hose from trusted sources - do some research !!

One of the best kits you can buy comes from a supplier in the UK called Master Injector they do a full set for the V12 Full service set Bosch injectors

It all depends on yoiur budget but unless you have the resources to hand for cleaning and testing it really is not a DIY task despite what a gazillion YouTubers would have you believe, sending them to a reputable service and repair centre would give you some piece of mind. I did my own injectors and spent the money on the tools to do so - I'm a bit stupid that way but I'm still tempted to send them out just to get them put through a commercial grade versus hobby grade tester. The tester I got did not come with fittings sutablke for the injectors in my car so I had to McGuyver things a bit. The spray pattern on every single one of my injectors was bad, 2 were particularly bad. The filter baskets on mine were full of nastiness and there was a fair bit of 'varnish' and that varnish takes some dissolving - then there's the part where these things don't want to be sitting without fuel in them for too long (mine are full of testing fluid and vacuum sealed presently), the state of my injectors led to me purging the entire fuel system - how deep do you want to go .....

As for the chance to do the cam cover half moons I would question that wisdom, since the manifolds need to come off to do that, you do not need to remove the manifolds to pull the injectors - their is always something more you can do on one of these cars - I started a 2 day clean up three years ago and mine is still on the lift. My manifolds were actually loose so there must have been at least one air leak, the seals were all rock hard too, you do not want to run a V12 lean or the first excursion to the red line will likely be the last.

Then you have to realise that you are disturbing wiring and 'stuff' that is past its sell by and things become even more fun - the injector harness is a known pain point on V12's

So is removing the injectors hard ?

No but that is the easy part, the challenges will escalate from there, it all depends how far into the Jaguar rabbit hole you want to go .....