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+--- Thread: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost (/showthread.php?tid=2814)
om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-26-2011
hi.
Was doing some test runs today, and suddently i heard a high freq knocking noise. then it was "misfiring" on one cyl when i drive with only follow throttle, but when i floor it and get boost it shoots away like it did before. Injector problem maybe? Any ideas?
RE: high freq knocking noise om617 - BRABUS - 07-26-2011
anyone?
tried to hold on the injector lines near the injectors when the engine is running. And i can feel the pulse at all injector except injector number 3. It was only a pulse there sometimes. not sure if this is something usefull, maybe it just was my head that told my it didnt pulse as much as the other injector lines.
RE: high freq knocking noise om617 - tomnik - 07-26-2011
any leaks in the injector lines?
One nozzle clamps (needle blocks)? This is normally related to a certain rpm range only.
Tom
RE: high freq knocking noise om617 - BRABUS - 07-27-2011
(07-26-2011, 11:36 PM)tomnik any leaks in the injector lines?
One nozzle clamps (needle blocks)? This is normally related to a certain rpm range only.
Tom
no there is not any leaks at the injector lines.
i started think about the valves, i recently did the valve adjustment could it be one of the adjusment nuts that has loosend and causing bad compression when not getting boost? I think its wierd because it pulls like hell when i first floor it and get boost, but before boost there is a rattling/knocking noise and you feel its not firing right at one cyl.
RE: high freq knocking noise om617 - Hercules - 07-27-2011
Possible sticking inj. Try holding a lg.screwdriver on inj. line, handle end to ear, if diff. sound than others pull inj.
Poor fuel quality can cause inj. to start hanging . Many times is water in fuel,suggest to carry fuel add.First sign of missing,poor running,nailing, install add. Other problems ,fuel is just to dry,inj.overheat,again install add.
RE: high freq knocking noise om617 - BRABUS - 07-27-2011
hi. Tried to losen the injector line to cyl 2 nothing changes. Then i swapped cyl 2 and 3 injectors, and still no change. so the engine is getting diesel.. But when it is cold it just run on 4cyl, but when its warm it runs at 4cyl but you can feel the 5th cyl wants to ignite. Any thougts? the noise is when the 5th cylinder start to ignite....
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - Captain America - 07-27-2011
Very strange. Wish I could help
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-27-2011
i also wish you could help me
if its not some easy fix. i have to park until next year. have to begin engine build and swap on my 98 E230 turbo soon
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - Oil Burner - 07-27-2011
Try to loosen 2 injector lines at a time, you should feel, hear, and see a major difference in the way the engine idles. if you find 2 that do not make a drastic difference, tighten one and open a different one if you find a drastic difference its the one you tighten if it’s not a drastic difference tighten the other one of the first 2 and loosen the other one again to verify. This is a very easy way to identify a injector not performing at its best but yet still working a little.
Hope this helps
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-27-2011
Oil burner.
I most likely found out that nothing wrong with injector ...
When its warm it idle at 4,5cyl. but when i open the injector line on injector number 2 it goes from 4,5cyl to 4cyl and its squirting diesel from the nut on the injector line... so im started to think the problem is valves or lower compression rings ?!?!? . because the the cylinder 2 wonth fire until the engine gets warm, and then it only fires at 50%. But when it get full throttle and boost it works like hell
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - Hercules - 07-27-2011
Recheck valve clearance, also ck prechamber ball,can burn and fall off, blocking exit hole part time,and will be noisy(rattle,knocking).Worn valve guide can also cause low speed miss, Low compression>
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-28-2011
gonna check the valves now... if it was bad comp, wouldnt i have pressure in the crankcase/blowby? its not much pressure in the crankcase, even when im driving at 2.5bar for boost. The ball in the precamber can fall off? where in the prechamger is it mounted?
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - randomdude - 07-28-2011
if you dont say what year/make/model/engine you have, then you should put it in your sig, so we know what we're working with.
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - larsalan - 07-28-2011
wut? it says om617 in the title.
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - willbhere4u - 07-28-2011
(07-28-2011, 08:52 AM)BRABUS gonna check the valves now... if it was bad comp, wouldnt i have pressure in the crankcase/blowby? its not much pressure in the crankcase, even when im driving at 2.5bar for boost. The ball in the precamber can fall off? where in the prechamger is it mounted?
Its directly under the injector if you have the injector out you can look down there with a flash light and see it there
glow plug prechamber and the little ball are in there
The ball glows red hod after the engine is running it ignites the fuel before it come out of the prechamber its like the glow plug but it stays hot with every ignition of fuel
The prechamber screws into the head and the injector in to it the ball is inside of the prechamber along with the glow plug!
Here is a pic of a bad one for comparison taken off some where else on this sight! not mine
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-28-2011
if nothing changes after i adjust the valve i wil try to remove the injector again and take a look down into the prechamber,.,
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - winmutt - 07-29-2011
Did you turn the element holders? This sounds like an injection pump problem to me.
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-29-2011
i havent touched the ip after i got it back from pp diesel in finland. and when i loosen the injector line at the injector at the cyl it is misfiring at, its squirts diesel. wee wil se when i innstall the pump on my new engine. Removed engine today, new engine new in a week or so
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - winmutt - 07-29-2011
Sounds to me like a delivery timing issue in the IP. This is an M or MW pump?
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-29-2011
this is a m pump. if its the ip its strange that it just suddently happend, the car has worked great for almost 2months with this ip.
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - winmutt - 07-29-2011
Delivery valve seals maybe?
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-29-2011
will see how the new engine runs with this pump. If still misfiring at cyl2 i will look at the ip.
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - DeliveryValve - 07-29-2011
I would verify cold and hot compression on all the cylinders. If they check out as being even, then it's an IP issue. Perhaps as simple as a DV seal as 'mutt has suggested. [/align]
.
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 07-30-2011
the engine is out so i dont worry anymore whats wrong with it. but im pretty sure its bad compression because of all the grey smoke caused by the one cyl misfiring. but thanks for your ideas
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - Drivmerc - 07-31-2011
Hi
On my 240D it happened exactly same thing
i did some runs and then when I stopped and let it cool down a little bit
at first it run on all 4 suddenly when i rev it it missfired and then it missfired at idle to so drove in the garage check the valve adjustment injectors took a comp test and had 14bar on 2 cyl took of the cylinder head and saw that my headgasket has blow by beetween 2 & 3 cyl and then test the valve leakage and all valves was leaking by a little bit
It may not be the same problem but it sounds like it should be the same
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 08-09-2011
new engine mounted, nothing wrong with the IP...
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - dieselboy - 08-09-2011
You going to pull the head and see what's wrong with the old one? You think it dropped a precup?
RE: om617 firing at 4cyl cold. 4,5 warm and 5cyl when at full throttle and boost - BRABUS - 08-10-2011
Will look at the broken engine next week. will post a update here when i find out what happend to it