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Ok guys, I am now thoroughly confused by my XJ6. I FINALLY got it running the other week (you have no idea how excited I was), BUT there was one issue... Its only running on 5 cylinders (didn't realize I'd bought a Volvo, lol). I checked everything, plug wires good, rotor and cap good, new plugs in it (Bosch Iridium), good compression on all 6 cylinders. No matter what I tried, cylinder 4 had a misfire. Then I noticed when I was doing the compression test that it's spark plug was still clean (not blackened at all). So just for the sake of saying I tried everything I swapped the injectors from cylinders 1 and 4. The misfire is now on cylinder 1 and 4 is now firing. So I need an injector, no biggie... or so I thought until I went to a nearby salvage yard to grab them and some other parts and now I'm completely confused as to what injectors I should have.
Here is the dilemma. Everywhere I've looked says that my May of 1993 built XJ6 should have "D3155KA" injectors with the green band around the center (Jaguar # EBC4430). But my Jaguar doesn't.. It has a full set of 6 "D3156KA" injectors (Jaguar # LHE1520AA). Then at the salvage yard today when I pulled some injectors from a 1994 XJ6, half of them were D3155KA, and half of them were D3155BA (can't find a number for that). I was under the impression that the D3156KA injectors didn't work in the XJ40 as they were for the X300 AJ16 and had a higher resistance? Does this mean I should find a full set of D3155KA (green band) injectors?
Rebuilt or some after market injectors for late cars don't always have the green band, check your VIN against the parts catalog, year isn't a reliable way to determine fitment.
The injectors in my car definitely aren't rebuilt. And they all have the D3156KA stamped into the side of the top. And I spoke to someone at my local Jaguar dealer. He says it should be EBC4430 (the green band). So now I know I have to get a full set of them, but I'm concerned as to how it'll affect the car after its had the wrong injectors in it for god knows how long.
Originally Posted by Lawrence
Rebuilt or some after market injectors for late cars don't always have the green band, check your VIN against the parts catalog, year isn't a reliable way to determine fitment.
Hi Michael - From my simplistic viewpoint, have you tried testing the injector to see if it "works" at all? You can hotwire it momentarily to see if it clicks. If so then it should be a viable unit. Is it possible that it is just stuck or clogged? If so, you can try cleaning it yourself at least enough to make it work. Good luck!
Larry, that's what I meant. When I called I gave him my vin. He says per my vin I should have EBC4430 injectors which are discontinued from Jaguar (kinda figured they would be, that or super expensive).
Originally Posted by Lawrence
So you checked your VIN against the parts catalog and found out your injectors were the wrong type?
I would definitely do that rather than talking to a parts dept rep.
Jerry, I tested them all out of the car with a small battery and they all clicked. I cleaned them out with injector cleaner, and if I "clicked" them while they had cleaner in it would dribble out. I'm wondering if it's because they are a higher resistance, maybe there just isn't enough power from the "pulse" to fire it properly? I think I'm just going to go with the smarter, safer decision and get a set of the correct injectors. Just annoying as I had been hoping to take the car for it's state inspection on Saturday, but not gonna happen now for a few weeks as I'll have to wait for the injectors.
Originally Posted by jerry_hoback
Hi Michael - From my simplistic viewpoint, have you tried testing the injector to see if it "works" at all? You can hotwire it momentarily to see if it clicks. If so then it should be a viable unit. Is it possible that it is just stuck or clogged? If so, you can try cleaning it yourself at least enough to make it work. Good luck!
I would think that if there wasnt enough power for the one, then they would all be weak or "off" somehow. Could you tell if the rest were working adequately?
As a useless aside, have you had the car running before? If not do you know that the previous owner didn't change them, even if they aren't rebuilt (something I would do- put different used ones in). Maybe someone put them in there and then gave up? Sorry, I'm sure you've already thought through this....
I honestly couldn't tell if the others were firing well. Because of the miss its already running rough. But when trying to move the car it does stumble alot. I've never had the car running until the other week. I know the car has been sitting a long time, which I also know is never good for any car.
Originally Posted by jerry_hoback
I would think that if there wasnt enough power for the one, then they would all be weak or "off" somehow. Could you tell if the rest were working adequately?
As a useless aside, have you had the car running before? If not do you know that the previous owner didn't change them, even if they aren't rebuilt (something I would do- put different used ones in). Maybe someone put them in there and then gave up? Sorry, I'm sure you've already thought through this....
there are ( from memory ) three different injectors,
no coloured band
white band
green band
most 1993 and 1994 cars use the green band injector
the difference between them is the coil impedance, this is read and used by the ECU , the wrong impedance means they may work , but not fully correctly ( duration and timing etc ), this also makes the ECU hotter than it needs to be ,
i do have a full set of great condition green band injectors if required, as when doing my rebuild i put in a full set of brand new ones, because i had them ,
Here is the dilemma. Everywhere I've looked says that my May of 1993 built XJ6 should have "D3155KA" injectors with the green band around the center (Jaguar # EBC4430). But my Jaguar doesn't.. It has a full set of 6 "D3156KA" injectors (Jaguar # LHE1520AA). Then at the salvage yard today when I pulled some injectors from a 1994 XJ6, half of them were D3155KA, and half of them were D3155BA (can't find a number for that). I was under the impression that the D3156KA injectors didn't work in the XJ40 as they were for the X300 AJ16 and had a higher resistance? Does this mean I should find a full set of D3155KA (green band) injectors?
Hi Michael,
The D3155KA injectors with the "green band" around the main body are Jaguar part number EBC4430 and are the correct original injectors for most '93-'94 XJ40s with AJ6 engine. They have a fuel flow rate of 210 cc/min and if I recall correctly are Peak and Hold injectors, turned on by a larger current (Peak), then held open by a smaller current (Hold). Note that the attached TSB indicates that the supplier (Lucas/Bosch) used the number D3155AA as the "Service Reference" for these injectors, and D3155KA as the "Production Reference." Your D3155BA injectors are probably of similar specifications but from an earlier production run than the KA injectors.
The D3156KA "white ring" injectors are Jaguar part number DBC10423 and are the correct original injectors for the '95-'97 X300s with AJ16 engines. They have a fuel flow rate of 220 cc/min and, if I recall correctly, are also Peak and Hold injectors. They work just fine in the '93-'94 XJ40s because they require the exact same drive signals and the ECM can easily adapt to the slightly higher fuel flow rate. I know, because I ran these injectors in our '93 for the last five years we owned it. It is possible that late '94 XJ40s were equipped from new with these, and quite likely that Jaguar dealerships installed these in XJ40s when supplies of EBC4430 diminished.
There is another "green band" injector with a green (or red) plastic ring around the upper neck, D3165AA or Jaguar part number DBC11041, which are correct for the X306 supercharged AJ16 engines. They have a fuel flow rate of 380 cc/min, which will completely choke an AJ6 engine, which I have proven empirically.
The injectors can usually be cleaned and restored to proper operation. The large images at Jag-Lovers are still not transferred to the new servers, but the thumbnails and descriptions are still up showing how I did it at home:
there are ( from memory ) three different injectors,
no coloured band
white band
green band
most 1993 and 1994 cars use the green band injector
the difference between them is the coil impedance, this is read and used by the ECU , the wrong impedance means they may work , but not fully correctly ( duration and timing etc ), this also makes the ECU hotter than it needs to be ,
i do have a full set of great condition green band injectors if required, as when doing my rebuild i put in a full set of brand new ones, because i had them ,
BB
Brake Buster I wish I could get the injectors from you, but unfortunately I have a feeling the international postage would make it difficult, not to mention a long wait.
Originally Posted by Don B
Hi Michael,
The D3155KA injectors with the "green band" around the main body are Jaguar part number EBC4430 and are the correct original injectors for most '93-'94 XJ40s with AJ6 engine. They have a fuel flow rate of 210 cc/min and if I recall correctly are Peak and Hold injectors, turned on by a larger current (Peak), then held open by a smaller current (Hold). Note that the attached TSB indicates that the supplier (Lucas/Bosch) used the number D3155AA as the "Service Reference" for these injectors, and D3155KA as the "Production Reference." Your D3155BA injectors are probably of similar specifications but from an earlier production run than the KA injectors.
The D3156KA "white ring" injectors are Jaguar part number DBC10423 and are the correct original injectors for the '95-'97 X300s with AJ16 engines. They have a fuel flow rate of 220 cc/min and, if I recall correctly, are also Peak and Hold injectors. They work just fine in the '93-'94 XJ40s because they require the exact same drive signals and the ECM can easily adapt to the slightly higher fuel flow rate. I know, because I ran these injectors in our '93 for the last five years we owned it. It is possible that late '94 XJ40s were equipped from new with these, and quite likely that Jaguar dealerships installed these in XJ40s when supplies of EBC4430 diminished.
There is another "green band" injector with a green (or red) plastic ring around the upper neck, D3165AA or Jaguar part number DBC11041, which are correct for the X306 supercharged AJ16 engines. They have a fuel flow rate of 380 cc/min, which will completely choke an AJ6 engine, which I have proven empirically.
The injectors can usually be cleaned and restored to proper operation. The large images at Jag-Lovers are still not transferred to the new servers, but the thumbnails and descriptions are still up showing how I did it at home:
Don, you say you ran a set of the D3156KA injectors in your XJ40. Were there any side effects from this, anything noticeable with the quality of it running? Like I said, right now the car has a set of the D3156KA's in it. When I measured their resistance, they were all around 13-14 ohms. When I measure the resistance of the D3155KA's they are around 3 ohms.
Don, you say you ran a set of the D3156KA injectors in your XJ40. Were there any side effects from this, anything noticeable with the quality of it running? Like I said, right now the car has a set of the D3156KA's in it. When I measured their resistance, they were all around 13-14 ohms. When I measure the resistance of the D3155KA's they are around 3 ohms.
No apparent side effects at all. The difference in fuel flow rate between the D3156KA and D3155KA is just 4.8%. The '93-'94 ECM has adaptive fueling capability up to +/- 10%, so it can easily adapt to the additional fuel flow.
Somewhere I have notes on the static DC resistance of my injectors but I suspect they are on the hard drive of a desktop computer with a dead motherboard that I haven't gotten around to repairing.
If your inoperative injector coil measures about the same resistance as your other injectors, it's possible that the microfilter is clogged and that replacing your filters and cleaning the injectors may restore them all to proper performance.
Brake Buster I wish I could get the injectors from you, but unfortunately I have a feeling the international
postage would make it difficult, not to mention a long wait.
I got my harmonic balancer from BB and it arrived in less than a week, came via post too and I'm in BC Canada with a notoriously slow postal service ..YMMV
RIght, so did a run to a local salvage yard, got another D3156KA and it's running on all 6 cylinders again. Slight hiccup every once in a while, but pretty sure that it'll clear out after I drive it and fill it with more fresh petrol. Thank you guys.
12-31-2020 | 02:47 PM
Fuel Injector Question
