Volvo d13 regen
No codes start of regen as truck ramps up rpm sounds of excessive fueling knock in cylinder and truck shakes like bad misfire then all of a sudden smooths out and starts to slow down then starts speeding up for regen shake and misfire excessive fuel knock returns. Compression test passed injector tests passed clean dpf turbo actuator passed. Ideas welcome
What do your EGT's in the aftertreatment look like when the regen starts? Does the AHI switch on during the Regen or is the misfire happening in the warm up phase prior to AHI? .. If this is in the warm up phase I would suggest checking the EGR for unintentional flow, EGR should be closed during this complete regen process, EGR EGT can usually be viewed during Regen, should be close to IAT…
I don't let it run long enough for temperatures cause I don't want to ruin a piston or injector because of the hammering in the cylinder but I will try egr test function in tech tool
I haven't gotten that far yet but wanted more insite when I am put back on it will keep you posted
Hi. Darrel, I agree with Christopher. They are known for injector issue With compression gases going to the fuel system. if the fuel level is on the lower end, you can sometimes see bubbles in the return line in the fuel tank. Also if the unit has Davco filter look inside the glass & see if you can see bunch of bubbles going into the suction side of the engine. you’re doing the right thing…
Thanks for info I took it for a drive to make sure there was no drivability issues and it drove like nothing wrong no codes good acceleration. When I get chance I will do egr test to eliminate that system
Hi Darrel, i own a 2015 Volvo truck with my daughter (780 ) . When i induce the regeneration progress the truck does the same thing like yours. The ecm or pcm creates bad running engine with changing the injection advance to help the system raise temperatures up fast , then it starts the fuel injection in to the exhaust stream thru 7th injector to start Regen. As far temps going it hits around…
So are you saying it's normal or it isnt?. Never came across this before
No is not that normal now that i hear the noises in the the video. My truck does similar noises like this till the #1 temp hits around 500-600 degrees , then it smooths out and start injecting diesel at the exhaust
First off if you have no codes why are you doing a regen? Is it to verify a repair or whats the cause to need a forced regen? Does this unit have any hard start issues? What does your egr diff pressures sensor read at KOEO? If it’s above 0.1 psi the sensor is either bias or you have a plugged diff port. Do you have any boost leaks where the engine is starving for air because it’s leaking out?…
Dpf light flashing originally intake exhaust test procedure showed 2.5psi differential pressure changed dpf and regen to verify fixed that's when it started the knocking and missing did not want to cause engine damage number 4 compensation factor was -23% all others was within 2% was told normal if not over 80. Compression was good injectors electronic test passed. Truck runs good as no problem…
Sorry that video is of a regen not an egr flow test. I can hear it clattering though in the back ground. There is definitely a fuel knock somewhere. Your sure there is not air in the return fuel to the tank?
Crap no I am not sure because they pulled me off to work on other stuff I will get you that video tho
Ok try this video this is it no hard starts I found out about a month ago they ran it out of fuel tho does the -20% compensation normal or is there something going on
No I would not be worried about that compensation. Can you get it to miss during anything other than a regen?
Nope I even did a 25 round trip used jake breaks trying to get it to do something I thought what I would try is a driving regen request thro tech tool
I did a injector and cup replacement about a year ago for air and why they didn't do all I don't know why so that chance still could be a issue
Yes I would check the fuel tanks for air while it’s on a regen.
Had a look at the regen video, your EGT 1 warms up pretty quick, when the DPF was out how did the face of the DOC look? Have you checked back pressure with either a mechanical gauge or pressure transducer? I have found EGT 1 is a good spot to check full throttle back pressure, that 1/8 pipe location they provide easily breaks off from what I have found. Should see less than 1 psi
Doc looked ok I had truck idling had pretty good flow thro it and snap throttle looked clean but I still will try is there a cheat sheet for regen parameters like freightliner has
I haven't seen anything official as far as a cheat sheet. But on second look on your regen your fuel pressure also seems to fluctuate quite a bit, sometimes that can be an indication of air in the fuel rather than actual fuel pressure fluctuations. Might be worth running a clear line on the cylinder head outlet during regen
No need to run a clear line. Just look in your tanks for air in the return. If you can’t see it from the fill cap. Remove the sending unit and sending unit blank plate if has two tanks. Air in fuel will cause t1 to ramp way ahead of schedule. An egr issue can cause it to ramp too. I’ve seen a bias diff psi sensor cause it to Jump way up and then it will cool down and jump again.
well thanks for the wonderful info from everyone not sure when I will get back on it but I will definitely look at all info suggested and try to figure it out and update once I have found it
Ok update time had it idling this am no air in fuel tanks took egr cross over off at venturi no air flow from cooler end at mixer end sounds like no muffler installed on your chevy pickup straight pipe sound I know that can't be right if my memory serves me right from all others I've heard from trucks but prove me wrong please removed cac at mixer and sound valve train adjustment check get puffs…
If your popping air back through the intake. It’s either a stuck closed turbo causing to much back pressure or an exhaust valve failure where it’s not opening or an intake valve stuck open or cracked. It was common on these years to drop valves on cylinders 5 and 6. But that was the exhaust valves and it would normally happen within 200k of leaving factory. This was caused by misaligned heads in…
Is the engine in “warm and hold” mode when your doing this check with the engine at idle? Strategy does use vgt to create back pressure during this mode. But should not be popping in the intake. I have had this occur with restricted exhaust, engine simply can't get the exhaust gases out so they end up back in cylinder on exhaust stroke creating a lot of issues, especially when regen mode is…
No warm and hold just idling like you started it to warm up and drive also turbo is out of the picture disconnected cac hose between cooler and mixer connection hold a piece of paper up and watch fluttering while idling so I am checking valve train turbo flow thro cac is good and smooth flow
Going to dealer the don't want to deal with engine problems thanks for your help