bad fuel mileage???

libbycrd · **Posted:** Sun Dec 30, 2012 2:00 pm

my 05 crd has 180K on it. has been the best vehicle ive owned. i straight piped it, modded the air box-like the forum on here said too, did egr block off plates. i have always avged 25+ mpg the entire time ive owned it. now its a 19-20 mpg what gives??? the dealer told me that the fuel pressure solenoid is bad (the big 1 at the back of the rail towards the firewall) its $800 from the dealer. i run amsoil and change the fuel filter at 5K miles. she has been an awesome vehicle. no complaints! just wish i could get the mileage back up to where she was!!! i wan the GDE tune but trying to save up fot it. it has a new fuel filter mount with the new updated pigtail. please help! advise on other mods i can do too!!

CRD05il · **Posted:** Sun Dec 30, 2012 3:23 pm

libbycrd wrote:

my 05 crd has 180K on it. has been the best vehicle ive owned. i straight piped it, modded the air box-like the forum on here said too, did egr block off plates. i have always avged 25+ mpg the entire time ive owned it. now its a 19-20 mpg what gives??? the dealer told me that the fuel pressure solenoid is bad (the big 1 at the back of the rail towards the firewall) its $800 from the dealer. i run amsoil and change the fuel filter at 5K miles. she has been an awesome vehicle. no complaints! just wish i could get the mileage back up to where she was!!! i wan the GDE tune but trying to save up fot it. it has a new fuel filter mount with the new updated pigtail. please help! advise on other mods i can do too!!

180K that give me hope that mine will last that long! 97k Down with a bad tcm.

libbycrd · **Posted:** Sun Dec 30, 2012 3:53 pm

if you take care of them and know diesels they will last, the VM motor is designed to go 500K til rebuild. its a sleeved motor. i have put it to the test- ive towed my 35 hp 4x4 front end loader tractor with it and gpt pulled over for speeding. the cop told me that " the only reason he pulled me over was cause the tractor was bigger than the jeep" it happen to be a buddy of mine. i pulled a f350 out of the mud, i whooped as* on a 6.0 powerstroke off the line and never caught up either. this vehicle is awesome. i want another. the only thing i hate is that it is so rare that u cant get parts and no scanners will read them

ChooChooman74 · **Posted:** Sun Dec 30, 2012 4:55 pm

I get bad fuel economy when I go to one certain low cost fuel station. Not worth the 10 cents per gallon savings.

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libbycrd · **Posted:** Wed Jan 02, 2013 11:02 pm

its not the fuel station!! there is something else can anyone help?????????

arengant · **Posted:** Thu Jan 03, 2013 2:50 am

Does your thermostat work? This time of year you mainlanders always bring up bad mpg with bad thermostats :-)r

Srytrucker · **Posted:** Thu Jan 03, 2013 10:48 am

I have similar issues of bad MPG and found out that I needed to clean map sensor replace air filter and my Tstat was bad so after doing all the above mentioned I was able to get to 20 MPG in 41 F weather but my next tank in 32 F only came back up to 15 MPG.
Am I missing something here? Any help.

kjjet · **Posted:** Thu Jan 03, 2013 2:26 pm

libbycrd wrote:

my 05 crd has 180K on it. has been the best vehicle ive owned. i straight piped it, modded the air box-like the forum on here said too, did egr block off plates. i have always avged 25+ mpg the entire time ive owned it. now its a 19-20 mpg what gives??? the dealer told me that the fuel pressure solenoid is bad (the big 1 at the back of the rail towards the firewall) its $800 from the dealer. i run amsoil and change the fuel filter at 5K miles. she has been an awesome vehicle. no complaints! just wish i could get the mileage back up to where she was!!! i wan the GDE tune but trying to save up fot it. it has a new fuel filter mount with the new updated pigtail. please help! advise on other mods i can do too!!

I would look at the following: (some you may have done)

1. Check the air cleaner.
2. Clean the MAP sensor.
3. Last time the fuel filter changed?
4. Engine temp should be at 1/2, if not you have a bad thermostat.
5. Inspect all the inlet hoses and intercooler for leaks.
6. Inspect the turbocharger for looseness. The turbine wheel should have very little movement.
7. Pull the injectors and have them tested.
8. Have you had the intake off? If not...@ 180k you most likely have worn rockers keeping the valves from fully opening.

Just a start...Good luck!

Srytrucker · **Posted:** Thu Jan 03, 2013 4:30 pm

kjjet wrote:

libbycrd wrote:

my 05 crd has 180K on it. has been the best vehicle ive owned. i straight piped it, modded the air box-like the forum on here said too, did egr block off plates. i have always avged 25+ mpg the entire time ive owned it. now its a 19-20 mpg what gives??? the dealer told me that the fuel pressure solenoid is bad (the big 1 at the back of the rail towards the firewall) its $800 from the dealer. i run amsoil and change the fuel filter at 5K miles. she has been an awesome vehicle. no complaints! just wish i could get the mileage back up to where she was!!! i wan the GDE tune but trying to save up fot it. it has a new fuel filter mount with the new updated pigtail. please help! advise on other mods i can do too!!

I would look at the following: (some you may have done)

1. Check the air cleaner.
2. Clean the MAP sensor.
3. Last time the fuel filter changed?
4. Engine temp should be at 1/2, if not you have a bad thermostat.
5. Inspect all the inlet hoses and intercooler for leaks.
6. Inspect the turbocharger for looseness. The turbine wheel should have very little movement.
7. Pull the injectors and have them tested.
8. Have you had the intake off? If not...@ 180k you most likely have worn rockers keeping the valves from fully opening.

Just a start...Good luck!

My crd is 06 160k Kim's so just 100k miles as stated I had replaced air cleaner, cleaned sensor replaced fuel and air filter replaced Tstat so it is at 1/2 all hoses replaced 6,7,8 not done for lack of knowledge resources......so I guess it is a major issue than a minor one ......thanks

libbycrd · **Posted:** Thu Jan 03, 2013 10:20 pm

kjjet-

I would look at the following: (some you may have done)

1. Check the air cleaner.
2. Clean the MAP sensor.
3. Last time the fuel filter changed?
4. Engine temp should be at 1/2, if not you have a bad thermostat.
5. Inspect all the inlet hoses and intercooler for leaks.
6. Inspect the turbocharger for looseness. The turbine wheel should have very little movement.
7. Pull the injectors and have them tested.
8. Have you had the intake off? If not...@ 180k you most likely have worn rockers keeping the valves from fully opening.

1-clean
2- which one is the map sensor? i need to do that then!
3-ff is changed regularly
4-t-stat is bad trying to find a GOOD but cheap 1, without ordering it from the stealership it only barely gets to a 1/4
5-brand new samco a2a hoses
6-turbo has a lil end shaft play but expected with mileage not too bad i have cummins with more play on them
7-going to do a BG injector flush at work
8-intake has not been off!!! so i need to replace the rockers??? do they make roller rockers for them?

arengant · **Posted:** Thu Jan 03, 2013 11:13 pm

libbycrd wrote:

1-clean
2- which one is the map sensor? i need to do that then!
3-ff is changed regularly
4-t-stat is bad trying to find a GOOD but cheap 1, without ordering it from the stealership it only barely gets to a 1/4
5-brand new samco a2a hoses
6-turbo has a lil end shaft play but expected with mileage not too bad i have cummins with more play on them
7-going to do a BG injector flush at work
8-intake has not been off!!! so i need to replace the rockers??? do they make roller rockers for them?

4-t-stat is bad trying to find a GOOD but cheap 1, without ordering it from the stealership it only barely gets to a 1/4

That is likely your cause, the safest way is to to it from a stealership. You can do an inline one (the stant one is the most popular) for around 30 bucks IIRC, and some coolant to replace what's lost. The MAP sensor is on the monifold on the driver's side near the rear of the engine.

2- which one is the map sensor? i need to do that then!

See the noob guide for pictures and a how to. Good luck!

ChooChooman74 · **Posted:** Fri Jan 04, 2013 12:11 am

arengant wrote:

1-clean
2- which one is the map sensor? i need to do that then!
3-ff is changed regularly
4-t-stat is bad trying to find a GOOD but cheap 1, without ordering it from the stealership it only barely gets to a 1/4
5-brand new samco a2a hoses
6-turbo has a lil end shaft play but expected with mileage not too bad i have cummins with more play on them
7-going to do a BG injector flush at work
8-intake has not been off!!! so i need to replace the rockers??? do they make roller rockers for them?

4-t-stat is bad trying to find a GOOD but cheap 1, without ordering it from the stealership it only barely gets to a 1/4

That is likely your cause, the safest way is to to it from a stealership. You can do an inline one (the stant one is the most popular) for around 30 bucks IIRC, and some coolant to replace what's lost. The MAP sensor is on the monifold on the driver's side near the rear of the engine.

2- which one is the map sensor? i need to do that then!

See the noob guide for pictures and a how to. Good luck![/quote]Get the STANT in hose for now. Cheap fix. I have a new thermostat on mine and my STANT is still in for the winter....mostly because my mechanic left it in there because I forgot to tell him to remove it.

kjjet · **Posted:** Fri Jan 04, 2013 10:34 am

#4. Thermostats in our CRD's are a problem for sure. There are several posts showing a inline 195 degree thermostat. I have a Stant 13519. Very easy.

#8. As far as your Rockers? They are rollers. But the pin that holds the roller get worn down and will break on high milage engines. I had several worn at only 96k and replaced all of them. I sent the old ones to Green Diesel Engineering (GDE) testing. Keith at GDE stated he was looking into why the pins get worn so quickly. If I had nearly 200k on a set of rockers, I would change them at my next timing belt change.

FYI...Removing the intake to get to the rockers is a big job. Have done it a few times, PM me with any questions.

bad fuel mileage???

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