XJ ( X351 ) 2009 - 2019

Won't start after intake manifold replacement

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Old Nov 1, 2025 | 03:50 PM
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Default Won't start after intake manifold replacement

Bonsoir,
je viens de terminer le changement de mon collecteur d’admission fissuré ( manifold cracked) , pas très facile mais après plusieurs heures d’effort tout est installé.
je n’ai pas débranché la batterie pour l’opération.
la voiture ne démarre plus depuis!😐
tout semble correct, pas de voyant au tableau de bord mais elle ne démarre pas.
j’ai évidemment démonté les injecteurs et la rampe commune et je n’ai pas fait de purge car je la pensais inutile (?)
je crois ne pas entendre la pompe à carburant.
avez vous une idée du problème ? Y’a t’il une procédure pour purger après ouverture du circuit de carburant? Une réinitialisation à faire?
merci pour vos avis
ErmenoBonsoir,
After completing the change of the intake collector fissured (manifold cracked), it is three easy steps to install.
I have not released the battery for operation.
la car ne démarre plus depuis!😐
tout semble correct, pas de voyant au tableau de bord mais elle ne démarre pas.
j'ai évidemment démonté les injecteurs et la rampe commune et je n'ai pas fait de purge car je la pensais useless (?)
I don't know how to understand the fuel pump.
Do you have an idea of ​​the problem? Is there a procedure to purge after opening the fuel circuit? Une réinitialisation à faire?
thank you for your advice
Ermeno
 

Last edited by Norri; Nov 2, 2025 at 08:19 AM. Reason: Added Translation
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Old Nov 1, 2025 | 04:44 PM
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Les interventions sur la rampe d'injection/le système de distribution de carburant ne devraient pas affecter le démarrage du moteur. Remarque : Il est déconseillé de faire tourner la pompe à injection haute pression lorsqu'elle est vide. Purgez l'air du circuit en actionnant le contact 10-15 fois sans démarrer le moteur (appuyez sur le bouton Start-Stop sans appuyer sur la pédale d'arrêt ; la pompe à injection basse pression fonctionnera environ 5 secondes à chaque cycle).
Sans cela, il faut actionner le démarreur très longtemps pour démarrer le moteur.

Si le moteur ne tourne pas du tout : Vérifiez les câbles du démarreur. Ils ont peut-être été débranchés pendant l'intervention.
Veuillez excuser les éventuelles erreurs : j'ai utilisé Google Traduction.

Work on the fuel rail/fuel distribution system should not affect engine starting. Note: It is not recommended to run the high-pressure fuel pump when empty. Bleed the air from the system by turning the ignition on and off 10-15 times without starting the engine (press the Start-Stop button without pressing the brake pedal; the low-pressure fuel pump will run for approximately 5 seconds with each cycle). Otherwise, the starter motor will require a very long cranking time to start the engine. If the engine does not turn over at all: Check the starter cables. They may have been disconnected during the work. Please excuse any errors: I used Google Translate.
 

Last edited by Norri; Nov 2, 2025 at 08:20 AM. Reason: Added Translation
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Old Nov 2, 2025 | 01:33 AM
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Merci beaucoup, la traduction est parfaite et j’ai bien compris la procédure!
Le moteur tourne bien, les câbles du démarreur sont en place.
Je vais suivre vos conseils ce matin 😊
Je vous fais savoir si ça a fonctionné
bonne journée

Thank you so much, the translation is perfect and I understood the procedure perfectly! The engine runs well, the starter cables are in place. I'll follow your advice this morning 😊 I'll let you know if it worked. Have a good day!
 

Last edited by Norri; Nov 2, 2025 at 08:21 AM. Reason: Added Translation
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Old Nov 2, 2025 | 01:47 AM
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J’ai essayé 10 fois et ça ne change rien.
pas de message au tableau de bord, tout semble fonctionner mais ne démarre pas.
la pression de carburant est de 880kPa avec le contact selon l’eobd WOW

I've tried 10 times and it doesn't change anything. No message on the dashboard, everything seems to be working but it won't start. The fuel pressure is 880 kPa with the ignition on, according to the EOBD WOW.
 

Last edited by Norri; Nov 2, 2025 at 08:21 AM. Reason: Added Translation
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Old Nov 2, 2025 | 02:36 AM
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Hmm… La pression de carburant est correcte.
Avez-vous installé les injecteurs à leur emplacement d'origine? Avez-vous effectué des modifications au niveau des injecteurs?
Veuillez revérifier le câblage des injecteurs et tous les connecteurs. Si tout est correct, la seule chose qui me vient à l'esprit est que le calculateur moteur ne détecte pas la rotation du moteur.
Un problème de câblage du capteur de position du vilebrequin, peut-être? (Capteur situé près du volant moteur, côté conducteur)

Hmm… The fuel pressure is correct. Did you install the injectors in their original positions? Did you make any modifications to the injectors? Please double-check the injector wiring and all connectors. If everything is correct, the only thing I can think of is that the engine control unit (ECU) isn't detecting engine rotation. Perhaps a wiring issue with the crankshaft position sensor? (The sensor is located near the flywheel on the driver's side.)
 

Last edited by Norri; Nov 2, 2025 at 08:23 AM. Reason: Added Translation
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Old Nov 2, 2025 | 02:52 AM
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Les injecteurs sont remis à la même place et je n’y ai rien changé.
Les seules pièces que j’ai touchées concernent les injecteurs/ tuyaux/ connecteurs/ collecteur d’admission/ volet d’air et egr
Tout est remis en place sauf changement du collecteur droit par un neuf
Le moteur est resté à sa place
Merci pour votre aide 🙏

The injectors are back in the same place and I haven't changed anything. The only parts I've touched are the injectors, hoses, connectors, intake manifold, air flap, and EGR valve. Everything is back in place except for replacing the right-hand manifold with a new one. The engine is still in its original position. Thank you for your help 🙏
 

Last edited by Norri; Nov 2, 2025 at 08:23 AM. Reason: Added Translation
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Old Nov 2, 2025 | 04:07 AM
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Ok.
Vérifiez le câblage et les connecteurs autour de votre zone de travail. Il est facile de toucher quelque chose par inadvertance. Vérifiez le câblage de la pompe haute pression. (Vous aviez de la pression, donc ça devrait aller.)
Il se peut aussi qu'il y ait tellement d'air dans le circuit que la purge est impossible. Vous pouvez essayer de desserrer les durites de carburant au niveau des injecteurs. Desserrez-les légèrement, ne les retirez pas (c'est de la haute pression !). Ensuite, actionnez le démarreur et vérifiez si le carburant coule correctement. Resserrez les durites jusqu'à ce que le carburant s'écoule de tous les injecteurs. C'est un peu salissant, mais propre après. Il faudra peut-être encore 4 à 6 tentatives de démarrage pour que le moteur démarre.
S'il y a de l'air dans le circuit, la pulvérisation des injecteurs n'est pas correctement synchronisée et atomisée pour la combustion.

Okay. Check the wiring and connectors around your work area. It's easy to accidentally touch something. Check the high-pressure pump wiring. (You had pressure, so that should be fine.) It's also possible there's so much air in the system that bleeding is impossible. You can try loosening the fuel lines at the injectors. Loosen them slightly, don't remove them completely (it's high pressure!). Then, crank the engine and check if fuel is flowing properly. Tighten the lines until fuel flows from all the injectors. It's a bit messy, but clean afterward. It might take another 4 to 6 attempts to start the engine. If there's air in the system, the injector spray isn't properly timed and atomized for combustion.
 

Last edited by Norri; Nov 2, 2025 at 08:24 AM. Reason: Added Translation
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Old Nov 2, 2025 | 08:28 AM
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@Ermeno @Vasara

Gents, the forum language is English, feel free to write your posts in your native language if you prefer but add a translation so other members can follow and contribute to the topic.
It only takes a few seconds with Google translate or whichever service you prefer.
Thanks.
 
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Old Nov 2, 2025 | 10:27 AM
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Originally Posted by Norri
@Ermeno @Vasara
Gents, the forum language is English, feel free to write your posts in your native language if you prefer but add a translation so other members can follow and contribute to the topic.
It only takes a few seconds with Google translate or whichever service you prefer.
Thanks.
Sorry. Yes, you are correct.
I were already using Google translate, so it would be easy to paste both. Will do that in future.
 
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Old Nov 2, 2025 | 10:57 AM
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Good evening, sorry to bother you. I'll do that in the future.
It's because Google Translate does it automatically on my device when i read.
And I didn't think I was causing you any problems.
I'm sorry again.
 

Last edited by Ermeno; Nov 2, 2025 at 10:58 AM.
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Old Nov 2, 2025 | 11:04 AM
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Thanks VasaraShould I loosen all 6 injectors or just the 3 I removed?
 
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Old Nov 2, 2025 | 11:22 AM
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Dosent harm to lose all, but i would start with 3 you worked with. Rest should be filled / full already, but since AJD-V6 engine fuel system rotates the fuel the air might be entered on these ones as well.
So: Lose pipes from the three you have been working with. Close each one by one once they start pouring fuel and then check other side too.
 
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Old Nov 3, 2025 | 01:46 AM
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Hello
Do I need to close it while the engine is running?That seems dangerous to me, doesn't it?
 
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Old Nov 3, 2025 | 10:09 AM
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You can crank the engine when the fuel pipes are loosen (not complete removed) Maybe open one turn each nut?
By this the air escapes from losened pipe connection, instead been pushed thru injectors.
If your engine actually start firing (by burning fuel, not by starter motor) when you have pipes losened, turn the engine off immediadly, this because fuel pressure will rise on very high figures.
If you get on firing state: Tight all pipes and continue with "closed" fuel system. You propably have rough running before all the air has been pressed thru.
 
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Old Nov 3, 2025 | 11:36 AM
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Du carburant sort des conduites de retour des injecteurs lorsque je mets le contact,
mais la voiture ne démarre toujours pas.
Je soupçonne un problème électronique ; j'ai le SDD, mais je ne le maîtrise pas encore et j'ai peur de faire des erreurs et d'aggraver les choses.
Qu'en pensez-vous ?

J'envisage de pulvériser du Starpilot dans l'admission.
Est-ce une bonne idée?
thanks
 
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Old Nov 3, 2025 | 11:50 AM
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I loosened the injector pipe nuts, and the fuel flows without any apparent problem.
 
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Old Nov 3, 2025 | 02:37 PM
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Ok. Hmm..
Start to be tricky. Do you mean you have JLR SDD in hand? (symphon driven diagnostic)
Basicly you can´t do harm with it for your car, if you are not trying to programm any module. (need engineer access) Since your vehicle was running before work, there should not be need for that.
These are values what are important for starting:
- Engine crankshaft rotation
- Intake air flow and temperature (both in MAF sensor - have you check that you havent mixed the wiring of two MAF:s?)
- Throtle body position sensor (mid center of engine)
- MAP sensor (on top of throtle body)
- Fuel pressure sensor
- Fuel temp sensor

Please re-check that the air passages are clear. Its not a first time that something is left to the airchannels during intake work.
Re-check all O-ring seals of air system. Specially throtle body to intakes and throtle body to air inlet pipe.
Peek inside of throtle body that air flap is turning freely.

Using starpilot is Ok for a short periods, but i would not recomment to run engine more than 1min with it. It burns with high temp.
 

Last edited by Vasara; Nov 3, 2025 at 02:39 PM.
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Old Nov 3, 2025 | 03:41 PM
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During disassembly, I noticed that an O-ring on the intake was damaged.Thank you for these very professional and practical tips.
I'll check all that tomorrow.

good night
 

Last edited by Ermeno; Nov 3, 2025 at 04:03 PM.
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Old Nov 3, 2025 | 04:07 PM
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Is there any problem with removing and disconnecting the throttle body while the battery is connected?
 
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Old Nov 3, 2025 | 04:10 PM
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And more generally, can you disconnect the battery without causing 1000 warning lights and faults?
 
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