All;

I made an injector tester with a Bosch connector, a microswitch, and a battery charger. I tested each injector several times. I guess as I get older, my hearing is not as well as it used to be. With my mechanic stethescope I could verify all injectors were clicking. I pulled injector 1A, left the harness connected pointed the injector into a glass jar and attempted to start the car. No fuel sprayed. I also tried swapping the greem righthand coolant sensor for the ignition.

Alex suggested that the fuel pump may be at fault, so I swapped fuel pumps before the last test.

The only other ground that I have not cleaned again is the ground at the rear of the r/h intake. So, I will try there next. The EFI ECU was functioning before I had to swap the engine due to a rod knock. The EFI wiring harness if you read my other post had fried wires and I was able to replace the entire harness with a used one that I was fortunate enough to find. That harness was bench checked to verify that all wires were intact.

 

Hi Mike

It still sounds like a Fuel delivery problem and or blocked Injectors

If the Car has been left standing for any length of time, it is very possible that 6 or more injectors could have become blocked up, as they don't have that much of a Shelf life if they have been reconditioned or something like that and in fact I had the very same problem myself

Where following on from the advice given to me by Greg and Grant, I pulled the whole Fuel Rail out with all the Injectors attached and then filled the Fuel Rail with Carburetor Cleaner and then touched each injector for just a couple of Seconds with the low power of a PP9 Radio Battery

Only to find that most of the 12 Injectors were Blocked and were 'Clicking' but not Squirting!

So I after continually dabbing each Injector, including hitting the metal part with the Tap/Tap of a small hammer, I got them all Squirting again, after which I put them back in the Car and She Started first time

It was a bit of a PIA but sometimes there is really no other way

Except that what you could try is to disconnect the Wires from the Fuel Pump of remove the Fuel Pump Relay then Connect a Tin of Carburetor Cleaner to the Fuel Rail and then see if you can get her running on that

I also wasn't kidding about the 'Hammer' as they sometimes need a bit of a 'Tap' (a good old 'Tap' to wake them up)

You could also try filling the Fuel Rail with Carburetor Cleaner and leave that internally soaking into the Injectors overnight

How I freed off all my Sticking Injectors using a Dab of Power from a PP9volt Battery and a Tin of Carburetor Cleaner

 

In the following 2 diagrams between pins 24 and 18 in the Ignition and EFI (respectively) ECUs you can see the connection between the two control modules.
It is a shielded wire that, from what I understand, times the firing of the injectors.

In the the ignition diagram you can also see the pin outs/ins for the front and rear crank speed and position sensors.
I would make sure all of this is right and intact....

I'm actually working on my LAPTOP/PC for this and I NEVER do... I think I like my phone better, lol.

 

All;

I pulled the fuel injection rail and tested the injectors to make sure that they were not clogged or stuck. I sealed one of the two fuel lines with a fitting and hose with a 5/16" bolt inserted secured with a fuel injection clamp. I hooked up my battery charger to act as a 12 vdc power source and used a compressed air gun. With the injector test lead installed on each injector and the injector solenoid clicked, I applied 90 psi to the remaining fuel rail fitting. If each injector was clogged, the air blew out any clog. Each injector sprayed the residual fuel from in the injector hose. With the injectors all operational, I reinstalled the fuel injector rail.

I removed the ground lug from the rear of the 6A intake branch and cleaned the lug to ensure good ground and reconnected.

I had the Mrs. turn on the ignition and verified the pump ran for two to three seconds. I had her attempt to start the car and verified that the fuel pump ran continously during the start attempt. I verified that I had spark.

Still no start.


You can see the ground lug for the EFI ECU on the rear stud of the 6A intake branch

Micro switch in the injector test lead used to trigger each injector

Battery Charger used as the power source for testing injectors

Compressed air line and blow gun. Fitting and hose used to blank off the other fuel line to the rail is seen at the top.

 

Hi Mike

It still sounds like a Fuel Pressure problem to me, so can you measure the Fuel Pressure that would come into the Fuel Rail if it were connected

It could be something as simple, as a blocked Fuel Filter

 

Well;

I established that the injectors are pressurized and pulse. I pulled 1A injector, aimed it in a jar and confirmed when attempting to start the car that the injector sprays. I verified that I have spark. So, since this engine had the heads pulled to change the head gaskets and set up the canshafts with the tool, I am going to look at ignition timing. I am thinking that if 180 degrees off, there won't be a start. This will take a while and I will report back after.


A1 injector pointed into a glass jar to test for spray while turning over the engine. Fuel does spray into the jar.

 

I got fed up.

Thinking there has to still be some fault in the Marelli ignition wiring harness, and as you may have read in an earlier post, the Marelli ignition harness is not available, but I could pull the existing harness, send it to Jagbits, who would then ship it to England to be remanufactured for $2600 plus their handling and two way shipping costs. That is just out of the question.

I decided to convert the ignition to that of an 82-88 with the Lucas ignition. It took me a while but I have rounded up all parts (including a Fuel System ECU) and a Timing pointer. From some of the discussions on here, The Fuel Injection ECU was changed in order to read the signal from the Marelli ignition, which I understood to be different than the ignition signal from a pre-Marelli car.

I wanted to get one of the new style ignition coils that replaces the dual coil arrangement of the Lucas equipped cars, but there are none available Stateside at this time. The new style coil is on backorder everywhere that I have looked. I have the original dual coils for a Lucas ignition that I bought along with the distributor and ignition module.

Can I get someone with an 82 to 88 V12 car to post a photo of how the two coils mount and where?

 

While on this subject, does anyone have a copy of the ignition wiring schematic for an 82-88 car that they can post please?

 

It's got diagrams for XJ6 and XJS. Be sure to look at the correct year. It contains multiple years.

Jon

 

Jon;

Thanks for this. Very good info.

Mike