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Watched the video, sounds/looks like an intermittent miss to me. The engine shakes more than it should, especially at idle. Have you tried cracking one injector line at a time to see if you can narrow it down to a certain cylinder that isn't firing correctly? Could have an injector nozzle hanging up. I'd also run a piece of clear hose for the fuel return from the pump/injectors and see if you're getting any air bubbles. You can have air pushed into the injection pump from a fualty injector which will really screw up how it runs... Ask me how I know! If you don't see any air, but can narrow it down to a particular cylinder, I'd do a leak down test of that cylinder, and depending on your findings, I'd swap injectors from one cylinder to another and see if you mis-fire follows the injector.
Jason
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Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics! |
#2
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Thank you Jason for your input. I am very glad for your help.
I will answer your questions Quote:
Unable to identify a cylinder that is not performing well. Quote:
All injectors were tested on the stand. The high pressure pump is also tuned. |
#3
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Do you have access to another known good injection pump? I think at this point I would swap it for another pne and try it.
Jason
__________________
Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics! |
#4
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Do you still think it's the pump? In the same way, the motor worked with the previous pump. before pump repair. Repair of the pump did not give any result. |
#5
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Well if it's not the pump it would have to be a mechanical problem with the engine, however the miss sounds to be intermittent. If there was a cylinder down on compression due to a ring issue or valve not sealing, the low compression would cause poor running consistently which typically will diminish as rpm increases as there is less time for the engine to loose compression. Have you done a leak down test? Another possible way to help with diagnosis would be to pull the injectors and inspect the tips of the nozzles. If there is a cylinder that is struggling to fire correctly the nozzle will be either moist with fuel or carbon'd up more than the other nozzles. Something to look at anyway. If you still can't narrow it down to a particular cylinder via injector inspection or a leak down test, I would suspect the pump and try swapping with another one.
Jason
__________________
Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics! |
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Thanks for helping!!! Thanks to your advice, it is easier for me to endure the war. You give advice. I check them. It takes away from the war.
v8volvo - this applies to you too. Yes. I did a test. The difference between the cylinders is 0.5 kgf / cm2 IMG_20220616_182709.jpgIMG_20220616_182735.jpg (Instrument readings are not correct) Quote:
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I have a question: what if the engine has a different degree of compression in the cylinders? If anyone cylinder protrudes from the block less than the others. A leak test won't show this. Can I try to reduce the thickness of the washers under the injectors? Last edited by samvear; 06-26-2022 at 11:02 AM. |
#7
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There is no adjustment for injector height, just the heat shield. But you would be able to detect difference in compression via a compression test.
Jason
__________________
Back again with a '84 760 GLE D24T/ZF SOLD but not forgotten! 1984 760 Sedan, built D24Tic/ T-5 swapped My engine build: http://www.d24t.com/showthread.php?t...t=engine+build T-5 swap: http://d24t.com/showthread.php?399-W...to-quot-w-pics! |
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My recent 940s 1995 purchase runs like this ......lumpy on warm tick over. Cold and hot start works perfectly
I changed the fuel filter and clogged air filter but still lumpy Will investigate further after I change the cam belt Is the crank bolt 27mm and the torque setting 300 lbs ?? I don't have the tool for locking the crank pulley, but will figure something out. Also need to find a bigger torque wrench lol |
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Forum members have made satisfactory facsimilies of the Volvo special tools, you can search here and find them. Involves welding and fabbing skills.
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1985 744 gle d24t 1985 745 gle d24t |
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I took the cambelt cover off to have a look at the belt as I am still in contemplation mode regarding the belt change, as I need so many specialist tools before attempting the replacement. So with the slack on the adjusting pulley side, I slackened the adjuster bolt and let the adjuster take up any slack, which it did. What a difference that made, no stuttering when pulling away or when changing up the box and a little less lumpy on tick over. The air intake pipe that goes over the rocker cover has evidence of oil in it so suggests the engine is breathing heavy and at 165K I am thinking it is in need of a rebuild ......but is it worth it ?? |
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