[ARCHIVED THREAD] - Duramax Problems!!! (Page 1 of 2)
Posted: 1/3/2016 2:58:17 PM EDT
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I own a 2003 Chevy Silverado 2500HD with a Duramax LB7 engine.
Today I took a ride and when I tried to accelerate quickly the engine sounded funny and it was acting sluggish. Once I got home I parked it and tried revving the engine in park and same thing, it acted like it was sputtering. What's the diagnosis? Could it be as simple as a fuel filter? Wouldn't it throw a code if something was wrong? |
| I am hoping that it is the fuel filter. I will change it some time this week. The truck has 120,000 miles but has been running great up until now. I don't think it's the Injectors as it's not blowing any smoke and has not gone into limp mode. It also has not been that cold so I don't think its the fuel being gelled up. I will report back after the filter change. Thanks for the suggestions. |
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I am hoping that it is the fuel filter. I will change it some time this week. The truck has 120,000 miles but has been running great up until now. I don't think it's the Injectors as it's not blowing any smoke and has not gone into limp mode. It also has not been that cold so I don't think its the fuel being gelled up. I will report back after the filter change. Thanks for the suggestions. Replace fuel filter at no more than every 10K miles, use ONLY AC Delco filters all others are crap. To test the primary fuel system on a Duramax you need a vacuum gauge if system has more than 1" vacuum you have issues. To test fuel pressure you need a Tech 2, can check your fuel pressure under load, should be between 26,000 and 28,000 PSI under hard load, idle fuel pressure 5,000 to 6,000 PSI. To tell if your injectors are bad you need to check the return rates. Easiest way is with a Tech 2, but can be done with vials that take 4-5 hours for experienced Duramax mechanics, with a Tech 2 I can check the return rates and tell if injectors are bad in 10-15 minutes. If you add an additive use Standyne. Products they are the best. If you didn't get a butt load of water in the diesel. New filter is a good place to start. |
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Replace fuel filter at no more than every 10K miles, use ONLY AC Delco filters all others are crap. To test the primary fuel system on a Duramax you need a vacuum gauge if system has more than 1" vacuum you have issues. To test fuel pressure you need a Tech 2, can check your fuel pressure under load, should be between 26,000 and 28,000 PSI under hard load, idle fuel pressure 5,000 to 6,000 PSI. To tell if your injectors are bad you need to check the return rates. Easiest way is with a Tech 2, but can be done with vials that take 4-5 hours for experienced Duramax mechanics, with a Tech 2 I can check the return rates and tell if injectors are bad in 10-15 minutes. If you add an additive use Standyne. Products they are the best. If you didn't get a butt load of water in the diesel. New filter is a good place to start. Quoted:
Quoted:
I am hoping that it is the fuel filter. I will change it some time this week. The truck has 120,000 miles but has been running great up until now. I don't think it's the Injectors as it's not blowing any smoke and has not gone into limp mode. It also has not been that cold so I don't think its the fuel being gelled up. I will report back after the filter change. Thanks for the suggestions. Replace fuel filter at no more than every 10K miles, use ONLY AC Delco filters all others are crap. To test the primary fuel system on a Duramax you need a vacuum gauge if system has more than 1" vacuum you have issues. To test fuel pressure you need a Tech 2, can check your fuel pressure under load, should be between 26,000 and 28,000 PSI under hard load, idle fuel pressure 5,000 to 6,000 PSI. To tell if your injectors are bad you need to check the return rates. Easiest way is with a Tech 2, but can be done with vials that take 4-5 hours for experienced Duramax mechanics, with a Tech 2 I can check the return rates and tell if injectors are bad in 10-15 minutes. If you add an additive use Standyne. Products they are the best. If you didn't get a butt load of water in the diesel. New filter is a good place to start. Thanks for the detailed response. I am going to take it to the dealer and have them change the Oil, Trans fluid and filters as well as the Fuel Filter. Hopefully that's the problem. I do run Standyne Performance at every other fill-up 
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you know maine gets wicked cold right? Quoted:
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I'll take a stab at it and say a guy in Maine isnt going to have gelled fuel. you know maine gets wicked cold right? 2 years ago my truck gelled up in KY. OP, put some Heet in your tank, change your fuel filter and see if that fixes the problem. |
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I am hoping that it is the fuel filter. I will change it some time this week. The truck has 120,000 miles but has been running great up until now. I don't think it's the Injectors as it's not blowing any smoke and has not gone into limp mode. It also has not been that cold so I don't think its the fuel being gelled up. I will report back after the filter change. Thanks for the suggestions. Day 1. 
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1) change Fuel filter.
2) dose with Rancor Biocide and a water emulsafier if it looks like you have water in your fuel. 3) Check that a boost hose didnt blow off or develop a hole. 4) Check injection pump (and lift pump if the Duramax uses one). 5) check injectors. One of those should work (hopefully 1-3 as those are cheap fixes). J- |
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Supposed to be 14 tomorrow and 0 tomorrow night. Yes it gets cold here!!! Quoted:
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I'll take a stab at it and say a guy in Maine isnt going to have gelled fuel. you know maine gets wicked cold right? Supposed to be 14 tomorrow and 0 tomorrow night. Yes it gets cold here!!! Should have had winter blend fuel starting in October'ish in that latitude (Michigan switches in Oct). J- |
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1. You can check actual return rates with a tech 2? Which sensor monitors that? Do you mean balance rates? 2. More than likely a filter, it will sense that it can't maintain the commanded rail pressure and throw a code, but it's not a "plugged filter" code...the closest thing in the ODBII list is "massive fuel leak" or something so don't freak out if you see that. I don't know if they use road salt where you are but if they do it may also be a rusted fuel line..03 is about due. The entire fuel system operates under vacuum until the cp3 pump so they will rust out but not drip right away. They just suck air causing a loss of prime or just poor performance due to fuel starvation. The lines like to rust in the plastic hangers just in front of the fuel cooler...attached to the frame about a foot behind the cab. It's most likely a fuel issue by the sounds. Filter first...then check the fuel lines. |
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Quoted: What's with you d-max guys and filters?   That and diesel fuel in the US goes from almost JP8 all the way to bad mayonnaise. I've plugged new filters in short mileage from getting a tank to two of shit fuel. I'd rather change the filter than injectors... Where is Ziarifleman....my spidey sense is tingling...  |
| you may also have fuel lines collapsing. fairly easy fix, took about an hour the first time i did it. before anyone poo-poos me, let me tell you the story. had an 05, at about 50 k it would occasionally 'bog down',i.e, would only run about 63 mph, tops. i could pull over to the side of the road, turn it off for 5 minutes, start it up and go on down the road. this happened alot. took it to the dealer/scene of the crime, had their'best diesel guy' diagnose it, said it was the fuel filter. fine, replaced the $50 filter, left the dealer/scene of the crime got aways away and boom, happened again. changed filter again, went a couple of days, happened again. took it back to the dealer, he diagnosed it as the feed rail. replaced it, picked it up from the dealer, happened again. went back, was less than pleasant and was told to fuck off, which i did. was talking to a friend who had a similar truck, he said he had the same problem. replaced the cheapass chevy fuel line with mo better ones. i did the same and 200k later it runs like a striped-assed ape with no further issues. look at the fuel lines if a filter doesn't fix it. |
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Quoted:
I am hoping that it is the fuel filter. I will change it some time this week. The truck has 120,000 miles but has been running great up until now. I don't think it's the Injectors as it's not blowing any smoke and has not gone into limp mode. It also has not been that cold so I don't think its the fuel being gelled up. I will report back after the filter change. Thanks for the suggestions. I'm going with fuel filter change it and I bet it's better |
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I've got a 2003 Duraamax I first replaced injectors at 130K...I replaced the injectors again at 192K. Mostly due to a lack of fuel filter changes. The second injector change was, I also replaced the fuel lines...change your fuel filter every 10k miles. It now run very smooth as silk. |
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GM tightened that little bastard up, trying to solve the injector issues early on. Bosch couldn't make injector seats that could deal with 30k psi particulates...pffft..germans...
That and diesel fuel in the US goes from almost JP8 all the way to bad mayonnaise. I've plugged new filters in short mileage from getting a tank to two of shit fuel. I'd rather change the filter than injectors... Where is Ziarifleman....my spidey sense is tingling...
Quoted:
Quoted:
What's with you d-max guys and filters?
That and diesel fuel in the US goes from almost JP8 all the way to bad mayonnaise. I've plugged new filters in short mileage from getting a tank to two of shit fuel. I'd rather change the filter than injectors... Where is Ziarifleman....my spidey sense is tingling...
I wish the filters on my Siemens K16 were better. |
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Quoted: you may also have fuel lines collapsing. fairly easy fix, took about an hour the first time i did it. before anyone poo-poos me, let me tell you the story. had an 05, at about 50 k it would occasionally 'bog down',i.e, would only run about 63 mph, tops. i could pull over to the side of the road, turn it off for 5 minutes, start it up and go on down the road. this happened alot. took it to the dealer/scene of the crime, had their'best diesel guy' diagnose it, said it was the fuel filter. fine, replaced the $50 filter, left the dealer/scene of the crime got aways away and boom, happened again. changed filter again, went a couple of days, happened again. took it back to the dealer, he diagnosed it as the feed rail. replaced it, picked it up from the dealer, happened again. went back, was less than pleasant and was told to fuck off, which i did. was talking to a friend who had a similar truck, he said he had the same problem. replaced the cheapass chevy fuel line with mo better ones. i did the same and 200k later it runs like a striped-assed ape with no further issues. look at the fuel lines if a filter doesn't fix it. |
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It was the fuel filter. Got it changed today and it runs like new again! How often do you change the fuel filter ? Reason for asking is that if you run them until they plug up instead of regular intervals (every other oil change) you risk a very expensive fuel injector(s) replacement job. |
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Quoted: I wish the filters on my Siemens K16 were better. Quoted: Quoted: Quoted: What's with you d-max guys and filters? That and diesel fuel in the US goes from almost JP8 all the way to bad mayonnaise. I've plugged new filters in short mileage from getting a tank to two of shit fuel. I'd rather change the filter than injectors... Where is Ziarifleman....my spidey sense is tingling... I wish the filters on my Siemens K16 were better. K16s don't like dirty fuel at all. Just do a CP3 conversion |
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How often do you change the fuel filter ? Reason for asking is that if you run them until they plug up instead of regular intervals (every other oil change) you risk a very expensive fuel injector(s) replacement job. Quoted:
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It was the fuel filter. Got it changed today and it runs like new again! How often do you change the fuel filter ? Reason for asking is that if you run them until they plug up instead of regular intervals (every other oil change) you risk a very expensive fuel injector(s) replacement job. Changed mine every oil change (I did oil changes when the on board comp told me to, 6-8k miles). Never a problem. The ONE time I didn't at 11k miles I got left stuck with a filter issues. |
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120,000 with no problems! I will stick with my Chevy's thank you. Quoted:
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Should've got a cummins, brah /thread Posted Via AR15.Com Mobile
120,000 with no problems! I will stick with my Chevy's thank you. 120,000 you say? On the original injectors? |
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Quoted:
GM tightened that little bastard up, trying to solve the injector issues early on. Bosch couldn't make injector seats that could deal with 30k psi particulates...pffft..germans...
That and diesel fuel in the US goes from almost JP8 all the way to bad mayonnaise. I've plugged new filters in short mileage from getting a tank to two of shit fuel. I'd rather change the filter than injectors... Where is Ziarifleman....my spidey sense is tingling...
Quoted:
Quoted:
What's with you d-max guys and filters?
That and diesel fuel in the US goes from almost JP8 all the way to bad mayonnaise. I've plugged new filters in short mileage from getting a tank to two of shit fuel. I'd rather change the filter than injectors... Where is Ziarifleman....my spidey sense is tingling...
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1. You can check actual return rates with a tech 2? Which sensor monitors that? Do you mean balance rates? 2. More than likely a filter, it will sense that it can't maintain the commanded rail pressure and throw a code, but it's not a "plugged filter" code...the closest thing in the ODBII list is "massive fuel leak" or something so don't freak out if you see that. I don't know if they use road salt where you are but if they do it may also be a rusted fuel line..03 is about due. The entire fuel system operates under vacuum until the cp3 pump so they will rust out but not drip right away. They just suck air causing a loss of prime or just poor performance due to fuel starvation. The lines like to rust in the plastic hangers just in front of the fuel cooler...attached to the frame about a foot behind the cab. It's most likely a fuel issue by the sounds. Filter first...then check the fuel lines. ^ This. Start simple. Regarding #2, it won't always throw codes. I got moving too fast, didn't securely fasten my fuel filter one day, started getting sluggish, as I pulled over on the side of a rural highway, stalled right out. Had to take my belt off and give the filter a slight twist and re-bleed it. If it does throw a code, there are a range of codes that might throw, not just "massive fuel leak", but also as simple as "incorrect fuel pressure ..... x". As for the fuel lines, if they are rusting and starting to pull air, you may see moisture on the frame around the leak (from the truck sitting, off) depending on where the leak is. If it's truly a bad enough leak, it'll be exactly like my fuel filter example, and the truck will biscuit until you replace the line. |
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Quoted: What lines are you talking about? They are mostly steel....very heavy rubber in a few spots. They do rust and leak down on the frame. Quoted: Quoted: you may also have fuel lines collapsing. fairly easy fix, took about an hour the first time i did it. before anyone poo-poos me, let me tell you the story. had an 05, at about 50 k it would occasionally 'bog down',i.e, would only run about 63 mph, tops. i could pull over to the side of the road, turn it off for 5 minutes, start it up and go on down the road. this happened alot. took it to the dealer/scene of the crime, had their'best diesel guy' diagnose it, said it was the fuel filter. fine, replaced the $50 filter, left the dealer/scene of the crime got aways away and boom, happened again. changed filter again, went a couple of days, happened again. took it back to the dealer, he diagnosed it as the feed rail. replaced it, picked it up from the dealer, happened again. went back, was less than pleasant and was told to fuck off, which i did. was talking to a friend who had a similar truck, he said he had the same problem. replaced the cheapass chevy fuel line with mo better ones. i did the same and 200k later it runs like a striped-assed ape with no further issues. look at the fuel lines if a filter doesn't fix it. |
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120,000 you say? On the original injectors? Quoted:
Quoted:
Quoted:
Should've got a cummins, brah /thread Posted Via AR15.Com Mobile
120,000 with no problems! I will stick with my Chevy's thank you. 120,000 you say? On the original injectors? Yes, the truck has the original injectors. I am pretty good about maintenance and I have been using Standyne Performance Formula since I bought the truck. |