Hello dear colleagues,

My 1986 XJ-SC HE has been bothering me for days.
The car was running perfectly and suddenly died while idling!
I tried to start it again, but it won't start!
I took out the plugs, they're all wet!
I have sparks and I also have pulses from the injectors.
I've tried replacing everything: booster, coil, pressure regulator, etc.
It starts late with the starter.
I haven't been able to figure out why it's over-rich.
I'm not an amateur; I have years of Jaguar experience, but it's driving me crazy!

 

OK,

You have spark, fat and Blue I will assume.
You have fuel, too much, oops.
Cold Start Injectors are dribbling. They SHOULD only activate at the required Temp, and ONLY during the Crank Mode. They were, and are, a PITA, and most HE owners delete them, and plate the holes, and plug the rail.

The Injection Pulse may not be as accurate as it appears, as the EFI loom is getting Old and that is a high fault item in any HE, regardless of use.

Edit 1:
The CTS may be causing grief at the ECU, and giving a Super Cold reading. Unplug that loom, bridge the terminals,in the plug, and that will fool the ECU to a Hot engine. Remember, that the CTS is the prime ECU fuel reading, as in "a running V12, unplug the CTS, dead V12".

I will read again, and think some more, and come back later.
A couple of thoughts.

 

Also make sure that the vacuum hose to the ECU hasn't broken or slipped off the nipple on the balance pipe.

Cheers
DD

 

Wet plugs = failed injector loom. Replace it, say I.

 

Danke für deine Antwort



Die Kaltstartinjektoren tröpfeln. Er hat keine Kaltstart Injektoren!

CTS habe ich eingestellt (0,3V) und mehrmals geprüft.

________________________________



Vielleicht sollte ich die ganze Geschichte erzählen?

Ich habe neue Motor eingebaut und alle nötigen Arbeiten durchgeführt, wie:

· Injektoren geprüft, gereinigt, Filter gewechselt, noch mal auf dem Injektoren Tester geprüft.

Alles war OK.

· Kompression geprüft alle 12 Zylinder zwischen 15-16 Bar.

· Zündkerzen erneuert

· Alle öle, Frostschutz erneuert

· Filter Kraftstoffschläuche ersetzt

· Zündzeitpunkt Eingestellt

· Kleinen Tank ausgebaut gereinigt und mit Zitronensäuere ausgekocht

· Grüßen Tank gereinigt, war kaum Rost

· Komplete Einstellung, Drosselklappen, Gestänge etc

· Vakuum richtig verlegt

· Und, und, und............



Als ich fertig war ist der sofort angesprungen und nach ca. halbe Stunde lauf hat der Leerlauf sich auch stabilisiert und das Auto lief wirklich wie ein Uhrwerk.

Habe mich auf die erste Probefahrt begeben, nicht weit, ca. 2 km um den Block da ich wenig Benzin im Tank hatte.

Kam wieder zurück öffnete die Haub und alles lief wie es soll.

Keine Leckes nichts!

Da sah ich an meinem Manometer unter der Haube das der druck langsam abfällt und ich stellte den ab.

Am nächsten Morgen holte ich 10 Liter Benzin von der Tankstelle füllt auf und startete das Auto.

Der sprang sofort an und lief sauber und rund mit ca. 1100 U/min, weil AAV aktiv war.

Also, alles bestens.

Ich ließ den laufen und widmete mich den Scheinwerfern um die fachgerecht Befestige, alles war nur so Amateurhaft zusammengeschraubt worden, so etwas kann ich nicht leiden.

Auf einmal merkte ich dass der Motor immer langsamer wird und schlussendlich auch ausging,

Ich versuchte ihn noch mal zu starten, aber nix war mehr.

Das war vor eine Woche und seitdem versuche ich den wieder zum Laufen zu bringen.

Ich habe alle Werte noch mal überprüft, alles stimmte.

Habe alle Pins am ECU durchgemessen, alle Werte im Rahmen der Toleranzen.

Habe ECU ausgetauscht - nix

Habe Zündverstärker ausgetauscht - nix

Verteiler ausgetauscht – nix

Volllast Elemente geprüft, sowohl Micro Schalter, als auch die Unterdruckdose haben die richtige Werte.

Ich habe Anlasser Signal (PIN 26) und auch Drehzahlsignal (PIN18)

Mit Startpilot springt der sofort an und läuft, geht danach wieder aus.

Nach zwei drei Versuche sind die Zündkerzen Nass.

Also, Zündkerzen wieder raus, ausblasen, saubermache wieder versuchen, wieder das gleiche.

Ich muss sagen das dies nicht mein erster Jaguar ist den ich nach lange stand Zeit wieder zum Leben erwecke, ich bin schon seit 40 Jahren mit Jaguar „verheiratet“ und in letzten drei-vier Jahren konnte ich mir mein Lebenstraum erfüllen und endlich ohne Druck und Geldsorgen das tun wovon ich immer geträumt habe.

In der Zeit habe ich einige schon wiederbelebt und die Leute die sie gekauft haben sind zufrieden und Glücklich!

Und nun erlebe ich, dass der Jaguar-Gott mich ärgert anstatt zufrieden zu sein dass ich so viel vom sichern Tod gerettet und wieder auf die Stresse geschickt habe.

Ich bin nach wie vor der Meinung, dass es sich um eine Lappalie handelt und dass ich morgen-übermorgen darüber lachen werde, aber in Moment ist mir nicht nach Lachen zu mute.



Bin für jede kluge Antwort dankbar!

 

Tom,

Just thrown into to Google translate. I had to do it so I would be able to read your response, so thought I'd paste for the benefit of others.

Cheers

Paul
************************************************** ************

Thanks for your reply.

The cold-start injectors are dripping. It doesn't have any cold-start injectors!

I adjusted the CTS (0.3V) and checked it several times.

________________________________

Maybe I should tell the whole story?

I installed a new engine and performed all the necessary work, including:

Checking and cleaning the injectors, changing the filter, and checking again with the injector tester.

Everything was OK.

Compression checked all 12 cylinders between 15-16 bar.

· Spark plugs replaced

· All oils and antifreeze replaced

· Fuel line filters replaced

· Ignition timing adjusted

· Small tank removed, cleaned, and boiled with citric acid

· Tank cleaned, there was hardly any rust

· Complete adjustment, throttle bodies, linkages, etc.

· Vacuum correctly installed

· And, and, and............

When I was finished, it started immediately, and after about half an hour of running, the idle stabilized, and the car really ran like clockwork.

I went for my first test drive, not far, about 2 km around the block, as I was low on gas.

I came back, opened the hood, and everything worked as it should.

No leaks, nothing!

Then I saw on my pressure gauge under the hood that the pressure was slowly dropping, so I turned it off.

The next morning, I got 10 liters of gas from the gas station, filled it up, and started the car.

It started immediately and ran smoothly at about 1100 rpm because the AAV was active.

So, everything was fine.

I let it run and turned on the headlights to make sure they were properly fastened. Everything had been screwed together so amateurishly, which I can't stand.

Suddenly, I noticed that the engine was getting slower and slower and eventually died.

I tried to start it again, but nothing happened.

That was a week ago, and since then, I've been trying to get it running again.

I checked all the values ​​again, and everything was correct.

I checked all the pins on the ECU, and all the values ​​were within the tolerances.

I replaced the ECU - nothing.

I replaced the ignition amplifier - nothing.

Replaced the distributor - nothing.

Checked the full-throttle elements; both the microswitch and the vacuum unit have the correct values.

I have the starter signal (PIN 26) and the RPM signal (PIN 18).

With starter fluid, it starts immediately and runs, then shuts off again.

After two or three attempts, the spark plugs are wet.

So, I took out the spark plugs again, blew them out, cleaned them, tried again, and the same thing happened again.

I have to say that this isn't my first Jaguar I've revived after a long period of inactivity. I've been "married" to Jaguar for 40 years, and in the last three or four years, I've been able to fulfill my life's dream and finally do what I've always dreamed of without pressure or financial worries.

I've revived several cars in that time, and the people who bought them are satisfied and happy!

And now I find that the Jaguar God is angry with me instead of being pleased that I saved so many people from certain death and sent them back to the stress level.

I still think it's a trivial matter and that I'll laugh about it tomorrow or the day after, but right now I'm not in the mood to laugh.

I'm grateful for any intelligent response!

 

Es wäre besser wenn du in English schreiben würdest. Ich glaube nicht viele läute werden dass verstehen können. Viel glück mit deinem problem.
-Mark aus Helmarshausen

 

THANKS Paul, that deserves a beer or 3.

The CTS is NOT adjustable, so I will assume you are at the TPS with the -3V mention.
The CTS is in the B Bank Thermostat backing casting, and has a 2 wire EFI style plug. That CTS is NOT unique to Jaguar, used on many cars with Bosch EFI. They are cheap, and reek havoc when they get upset.

The fact it was running, and apparently, running well, does tick the same to me, AKA some small thing is upset.

The starter fluid running is good, and then a shorted EFI loom will flood the engine, and give what you got.

Check the integrity of the loom plug AT the EFI Resistor Pack, engine bay, behind the RH headlamp area. That gets full of rubbish, so unplug it, clean both sections, just to cross it off the list.

 

Is there fuel pressure? An engine slowly dying usually indicates fuel. The plugs could be wet because of inadequate spraying (ie just dribbling) as a result of low pressure.
But injector loom is still my favourite. Plus worth doing this maintenance too, see:
https://www.jaguarforums.com/forum/x...sistor-134745/

 

Thanks Grent,

Of course, I mean the TPS, sorry, but you got it right away.
The CTS is a common problem and is one of the first sensors I check.
It has a reading of 1.8-2.3 depending on the temperature, and I measured the same value on the ECU, so both the CTS and the wiring are OK!

I think, just like you, that it's some kind of loose connection or broken wire, even though I've already checked everything.
One thing is definitely certain: it's injecting too much fuel and flooding the spark plugs.
First, I checked for ground somewhere on the wiring harness, but there was nothing!
This morning, I checked the injector drivers "ON" and "HOLD"; they're all pulsing, so that's not the problem either!
Yesterday, I checked the "Full Load Switches" and also suppressed the "Full Load Dose & Micro Switch." Both of those are OK, too!

Thanks, Greg.

I wrote that my fuel pressure is constant and stable (2.5 bar).
Of course, I checked the injector wiring harness several times.
Not just the wiring harness itself, but also the pins on the ECU.
Everything is OK!

 

OK, I will type what I think as I think it, hope it makes sense.

The only way this thing can get fuel into the engine is Via the Injectors (1). The cold starts the main issue, but you no got cold starts, goodo.
Your loom checks out, but still a suspect in my foggy head, based on experience and old age, along with too many V12 Monsters.
The FPR, B Bank, does leak internally, and the small vac hose is the supply for raw fuel. BIT, that usually floods the B Bank only, and dribbles out the air cleaner casing.
The A Bank "Pulse Damper" FPR, does the same, and is a redundant item to most V12 owners, hence the delete PDF I have posted years ago.

Haystack needle time.
Doug mentioned the Vac line TO the ECU. It can be a problem. REMEMBER, this P Digital system works on LOW Vac, more fuel, Hi Vac, less fuel.
Some markets, ours, had a plastic condensation capsule in the boot, near the battery, in that Vac hose. They crack, vac drops, fuel ingestion rises a lot, to the point the engine floods.
INSIDE the ECU, on the other side to that Vac Inlet, is a small vac hose TO the MAP sensor in the circuit board, that hose splits, vac drops, fuel ingestion rises, a lot.

Thats about it, but I will add later if something else pops into the Grey Matter.

EDIT #1
I did this waaaaay back, so I know its possible.
The CTS and the ATS plugs are the same, and the Pigtails are near as damn it the same, and plugging the wrong ;tail to the wrong sensor, does what you have. Took me 3 days, and too many beers to find it, but it stays imbedded.

 

Grant, thank you so much for your concern and support!
But Grant, the engine has to start first to build up the vacuum, and mine won't even start!
I already checked the hose and, just in case, routed and connected a new one from the outside.
My CTS cable is much too short to connect to the air filter.
Condensation capsule is sealed, as is the connection to the ECU; I checked it with the vacuum pump.
The vacuum hose to the MAP is also out because I had the same problem with a different ECU.
I'll keep looking tomorrow morning...