Diagnosing a Duramax with low power.
Vložit
- čas přidán 23. 07. 2024
- This video is an example of how we diagnose diesel drivability issues without changing a single part or guessing what the fault is. In this example the truck is a 2002 Chevrolet Silverado 3500 with the LB7 engine.
Check out our website at:
www.dieselpro.ca - Auta a dopravní prostředky
Wow I can’t imagine how long it would have taken me to piece all that info together great video definitely getting saved
Very underrated video! Great job
Awesome video! Wish there were more techs like you!
Would this apply to the CP4 as well?
Awesome
Great presentation. Would like to see a known good frp signal with full functioning chambers. Thanks for the video
Great suggestion!
Agree 200%
I wish i could bring you my truck. Trying to diagnose a P0087 and this is the proof i would like to see before i spend a few thousand $$ to replace something.
I have a 2006 sprinter with a cp3 and I've dealing with this problem for 4 months. I would have a high rail at start up, then once it warmed up I could clear the high error. On driving it would then develop a low rail at acceleration or any load on the vehicle, like a slight raise in the road. I pulled out the pressure graph and could see the pressure just drop when this happens. In park and stepping on the gas pedal, I can not get the low pressure error to appear. I replaced the fpr and it fixed the high rail pressure but I still have the low at running. Vehicle lacks power overall. Help. !!!!
Generally, when we see an issue with the FPR it is from a fuel contamination problem. This usually causes injector issues as well. I would recommend an injector return flow test.
@@PGFuelInjection that's what I originally investigated, pumping all the fuel out through a coffee filter w/ a super magnet, I found nothing. Then took the hpfp apart and found some surface rust, bought remanded pump that produced no pressure, so redid my own and replaced the Fpr twice, first ebay fpr produced high rail pressure on start up. Now the high pressure error is gone, but get low pressure on acceleration
@@frontlinemedia4270 Your scenario matches our video perfectly. There are multiple tests that need to be performed at this point. Fuel supply pump pressure, injector return flow, scanning the ECM, testing the fuel pressure sensor, testing the CP3 pump and testing the FPR on the rail. Without perform these tests, even the top Mercedes diesel mechanic in the world would just be guessing at what is wrong.
Having said that, you did find the fuel contamination. You had a water contamination issue which has left rust. Surface rust can be very detrimental to the injectors.
@@PGFuelInjection yes, I must of gotten bad fuel at a grocery store chain and normal add dry gas but didn't. I've done most of these tests manually. I'm down to 3 things. Fcv, TPS, or injector. I believe it is an injector that only shows up at a high pressure, which then dumps the fuel. I'm sure you could confirm this with your equipment, but I don't have that stuff. I just have a basic scanning tool. Where are you guys located, AZ?
@@frontlinemedia4270 Sorry, we are about 2,000 miles north of you in Canada.
Canada: what diesel additive do y'all use in winter months to prevent diesel Gelling; DEF below 20*F will freeze. If you can maintain a diesel in colder climates, you are a master of diesels in the Southern States!!!!!
Our fuel does get blended with No. 1 diesel in the colder months to prevent gelling but when it dips to -40 F we still see some gelled up trucks. I would recommend Stanadyne or Alliant Power additives.
Where your shop located? I’m having the same issues when towing lack of power
We are located in Prince George, BC, Canada.
What kind of scanner are you using in this video
The scanner is a GM Tech2 and the oscilloscope is a Picoscope.
Can I bring my truck to you guys haha I’m in Texas and I can’t find a good mechanic
I that you said you want to have proof of what’s going on. In other words diagnose the problem. In Houston I’ve gone to 3 diesel mechanics and they just give up. Sadly they are not skilled enough. Not sure where to turn. My issue is the motor sounds like a blown motor when starting cold first thing in the morning.Every 5 mins it gets better and in 20 mins runs smooth with a little slight hiccup. I’ve offered to pay $1000 to whoever can solve the problem. Dead serious and dead tired over this issue. Let me know if you have any ideas? A mechanic with your knowledge would be great but not sure where you’re located. I would live to hear from you and will try to find your number
We are located up in Canada. What year and make is your truck?
@@PGFuelInjection 2005 Chevy Duramax. I had planned on calling you tomorrow after the holidays. I need to be at a shop with the correct scanner to be ready for the test. You will get paid for this of course.
History! New engine 8,000 miles. Ran great. Now knocks severely when cold. Heats up and runs fine. No smoke. We just put a Fass lift pump on hoping it was a suction leak but no leak shown. During the day the truck runs great. Calibrated power out of Michigan did the tune and no other mode except air intake to turbo and larger downpipe to exhaust
Where are you guy located?
We are in Prince George, British Columbia, Canada