I just bought my first diesel.........heard alot of good about Duramax, but seems sluggish. I have replaced air filter, fuel filter and cleaned MAF. It's a little better, but I'm not getting the pick up I feel it should have. Bone stock.

Any suggestions would be helpful.

:help: , Gary

sluggish could mean a lot is it slow of the get go or in the mid range or all the time let us know

wow a lot of people have been putting up posts about this lately. As fot the LB& they are sluggish off the line untill the boost builds and than the move as for sluggich elsewhere in the power i dont no.

I pretty much agree with the weak low end until you build boost. My 2001 is much better with the muffler off. I have no other power adders. So I can see how a bigger exhaust system may not dyno that much higher, but building boost early really makes the truck feel faster on the bottom end. Once you spool it up, they really go. I like to leave from a stop by "setting" the throttle so it shifts around 2200 Rpm.......and the Ally snaps off those nice shifts 1/2/3/4 .....next thing you know, you're doing 65 mph. nice

I mean sluggish all around.........off the line, mid-range and top end. Doesn't seem to ever spool up. An Escort could beat me! Gas mileage is approx. 12.

I would say to have it checked out. There are many things that can effect
power output. Fuel filter, air filter, leaky hoses in the intake system,
stuck waste gate, and of course injector problems, etc.
You covered some of them already, so maybe a trip to a dealer for a
injector balance rate check might help. Do you have a boost gauge?
Is it building boost? Also fill in your sig, so we can see what year and mods
you have. It will help the techs that are here to answer. Good Luck!!!

Brownstown.....

1) You need to fill out your signature so we all know what year truck you have.

2) Is the truck making any odd noises? Blowing white smoke? Just anything out of the ordinary would help us figure it out.

3) I know you're in Michigan...are you close to Holland/Zeeland area? That's where Eric is....

If you live in Brownstown, give me a call I live just west of Monroe. Maybee to be exact. I might be able to help you out. I'll PM you my cell number.

Ok

After I made the last post, I have been to 3 dealerships. At the last dealership, they told me it was my injectors were dirty. They cleaned them..........$350 later, that wasn't the problem. No difference!!

I heard about Merchant Automotive in Holland, Michigan and I contacted Eric and set up an appointment to take my truck there. After only being there for 15 minutes, he diagnosed my problem. It was the injector pump. Replaced it.................runs EXCELLENT!!! I couldn't be happier.

A big thanks to the ones on here that suggested I contact him, and a HUGE THANKS TO MERCHANT AUTOMOTIVE.

And the gas mileage improved considerably............it's 18.2 MPG.

Out of curiousity what was the toll on the pump? I would have to look but mine set me back about $1300....... Lots more power........ but has more of a diesel sound @ idle goes away as soon as you give it some pedal.

why would he need to replace the injector pump, was it worn out?? or just one that had a defect?

Out of curiousity what was the toll on the pump? I would have to look but mine set me back about $1300....... Lots more power........ but has more of a diesel sound @ idle goes away as soon as you give it some pedal.

With regard to the price, yeah, a little less than that. And definitely more of a diesel sound now. Compared to what it was, definitely louder now.

why would he need to replace the injector pump, was it worn out?? or just one that had a defect?

It was putting out less than half the pressure it should.

Worn out? Defective? Don't know, but it was definitely not working right.

It was putting out less than half the pressure it should.

Worn out? Defective? Don't know, but it was definitely not working right.

Hmmm. What *should* the pressure be, and how do I check it?

Glad you got it fixed. Eric is good about that and taking care of people before, during and after the sale... Good guy..

yeah i wouldent mind finding out how to check to see if mine is bad, cause my truck is getting a bit sluggish to, im wondering if this is my problem also.

yeah i wouldent mind finding out how to check to see if mine is bad, cause my truck is getting a bit sluggish to, im wondering if this is my problem also.

i will second that, fuel mileage down to 11 mpg from 18 unloaded.

My buddy has a scanner ( i think mactools) i use it to check the balance rates every 6 months or so. Can "we" use a scanner like this and what are we looking for?. Dealers around here aren't much help. last time i talked with them about this... they gave me the injectors need cleaned story as well.

ttt

Hey Shouldn't They Be Free? Guarenteed 200,000miles Right?

ttt

??? What the H3LL does this mean? :confused: I keep seeing it on here, and can't figure it out.:help:

??? What the H3LL does this mean? :confused: I keep seeing it on here, and can't figure it out.:help:
To The Top

Hey Shouldn't They Be Free? Guarenteed 200,000miles Right?
01' and 02' warrantied for 200k
03 and up warrantied for 100k

To The Top


:cool2: So what does "To The Top" mean? Sorry, I'm new.

ttt
means... put this thread to the top of the list so someone will answer my question!:eek:

And i think the injector pump is only covered to 100k miles. I am at 98,345 by the way and 5 years ends next month.

Are there any other signs of the pump going out or is it just sluggish?

Are there any other signs of the pump going out or is it just sluggish?

fuel mileage 11mpg unloaded, pilot injection (or lack of) noise sounds more and more like a 7.3. slower spool up. more pronounced jerky pedal. only smokes when cold...i think is normal.

but i don't know if these are signs of the pump going out or not. i have a couple of injectors right at the no-go range, but not out enough for the dealer yet.

i am trying to find the problem. maybe change the fuel filter again, take off the juice and see.

i was hoping to put the scanner on and see if the pump pressure was down, after searching here and finding out that the pumps have corrosion issues along with fuel regulator problems which i have had.

?????

I have a 2002 Duramax, Crew, 2whl drive, all stock but for K/N air filter. It has been cleaned, and still a little sluggish, plus the check engine light comes on and off irregularly. The mechanic's code reader wouldnt read from port. Communication problems. It has 134,000 mi. All obvious items have been checked, i.e filters, leaks, fluid changes. Any help would be nice considereing I really dont want to take to local dealer. THanks

ttt
means... put this thread to the top of the list so someone will answer my question!:eek:

And i think the injector pump is only covered to 100k miles. I am at 98,345 by the way and 5 years ends next month.

Okay, on the same page now. Thanks.

my teck guy would put his computer on my truck, ask my pump for the most pressure, the pump would not deliver so it would go to limp mode. he repeated it several times and checked the vaccum on my pump, it was low so we concluded the pump was bad. put on a new one and fixed it. cost me $1050.00