For those of you who have not seen my other thread about the tensioners, a little back story (short version)...

I replaced my secondary tensioners, now my engine is running poorly, and I have a misfire on cylinder 4.


So, my question to all of you smart folk is:
Do I replace the one fuel injector for that cylinder or do I replace all 8 of them?


It's throwing two codes pertaining to this: Misfire cylinder 4 & Injector open- cylinder 4...

I am willing to bet the misfire is due to the injector not functioning.
I see on eBay sets of 8 injectors that are "flow matched" what does this mean?


Thanks in advance for the input!

 

I would move and swap it with another injector and see if the fault follows the injector. If not might be a wiring harness issue and not an injector problem.

 

Hi Bcrary3,

Flow-matching just means all the injectors in the set have been shown to spray a similar amount of fuel in a fixed amount of time, usually cubic centimeters per minute (cc/min). The matching tolerance should be stated, as in +/- 5% or +/- 10%.

+1 on Vern's suggestions, but I would suggest the reverse order. Before you go to the trouble of moving the injector, it would be easy to check for a proper signal at the injector electrical connector with an inexpensive noid lamp available from most auto parts stores (and possibly available on free loan).

You can also use a voltmeter to check for a constant 12V between the Black/Red wire of the injector's electrical connector and ground (note that for some strange reason on the back cylinder of bank B both of the injector's wires are Black/Red).

If you determine the injector has a constant 12V and the voltage is being grounded to pulse the injector, then the injector is suspect. You can bench test it with a 9V - 12V battery. It may be seized, the coil may be broken, or the filter basket may be obstructed.

At the links below are photos showing how I cleaned my own injectors (but did not flow-match them):

Welcome to Jag-lovers - Members Photo Viewing Page
Welcome to Jag-lovers - Members Photo Viewing Page

Cheers,

Don

 

Nix the plugged injector since he says he has an open circuit error!~

 

Clogged injector would be suspect if it wasn't showing the open injector fault... That is why it leads me to believe the injector itself is faulty?

Or possibly an electric error somewhere in the connector... I will check the contacts on all of the connectors tonight and clean up the connectors and see what happens.

Whilst I am at it, I will also clean up all of the ground points that I can access in the engine bay to try and clear up some of the CAN bus errors.

If I end up having to pull out and replace that injector, I may bench and clean/test them all.
Anyone have any suggestions on cleaning injectors outside of the motor?

 

Can you take them to a hydraulics shop that deal with injectors or an injector cleaning specialist? Seems pointless doing just one. I'm lucky in that I've a shop I drop a few sets off and get them to sonically clean them in a bath then flow test them and put together the closest set for a good match.

Jaguar only use one engine flush/cleaner on these units and that is BG44, something to try.

 

Did you look at the photo albums Don B linked to earlier in this thread?

Ray

 

I picked up a full set of reman's off of eBay for a good price that were (stated as) matched and flowed, very happy that I did the whole set.

I had 2 known bad or inconsistent injectors which is why I was on the replacement path.