VW PD engind issues | Retro Rides

dubwarrior2 Part of things "Open up, its the filth" Posts: 576	VW PD engind issues dubwarrior2 @dubwarrior2
	Dec 28, 2020 22:57:32 GMT Select Post Deselect Post Link to Post Back to Top
	Firstly apologies, as my isue is with a 2008 vw t5. But I can not find an answer anywhere and its killing me now, not being able to fix it..... My 1.9pd has started misfiting badly in 4th and 5th gear under load. Only once the engine is warm. Linked to this, the fuel tank is pressurizing MASSIVELY.. Can hear and feel it whooshing out when thr cap is removed. Ive ran the van without the cap on and it still runs badly. Ive done a fault code scan and no codes at all.. Feels like fuel starvation. I'm thinking maybe the in tank lift pump. Are these in tank pumps constantly running or do they just prime on initial fireup? Any help appreciated
	Volvo powered VW T4

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Midas Part of things Posts: 505 Club RR Member Number: 14	VW PD engind issues Midas @midas Club Retro Rides Member 14
	Dec 29, 2020 11:53:25 GMT Select Post Deselect Post Link to Post Back to Top
	Can’t help with the over pressure, but I used to get misfiring when warm on my Golf GT Tdi. It was caused by the wiring that runs to the injectors under the cam cover breaking down.


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Mantasport Part of things Posts: 704	VW PD engind issues Mantasport @mantasport
	Jan 2, 2021 10:41:25 GMT Select Post Deselect Post Link to Post Back to Top
	Injector loom is a common issue on PD's. But worth getting it looked at on VagCom as that can show injector calibration numbers to check it.
	www.Mantasport.co.uk Opel Manta spares, Modifications and Restoration

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ChasR RR Helper motivation Posts: 10,189 Club RR Member Number: 170	VW PD engind issues ChasR @chasr Club Retro Rides Member 170
	Jan 3, 2021 22:23:03 GMT Select Post Deselect Post Link to Post Back to Top
	It does sound like you have a few faults. I'd check what codes come up on VCDS, and check the fuel pressure in a few areas. Check the Injection calibration values too. If the calibration values are off, and it has a low MAF error, it will be the camshaft that is shot. They'll idle fine as the injectors can compesate at idle. As soon as you drive, it will misfire, with it getting worse under load and chucking out alot of black smoke. Normally, the cam will get noisy at this point, and sound tappety, but if the engine hasn't seen oil changes or someone has put in tappet treatment, it will conceal the noise. As for the pumps, they work as follows -Lift pump in the tank - pressurises constantly -Camshaft driven tandem pump - Pressurises constantly -Injector ; Each injector has a cam driven pump built into it aka a Unit-Injector. These again are pressurised constantly.
	~~'72 Mercedes W108 280SE 4.5~~ '79 Honda NC-50 '03 BMW M3 Coupe '08 BMW E91 325d M-Sport Touring Pre-LCI '16 Yamaha XSR700 My car history and exploits: leylandlegends.com

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