300 tdi - baad economy - Defender Source
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  #1  
Old May 4th, 2012, 01:27 PM
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My 300 tdi is getting sub par economy. On average about 17 mpg. Fuel filter is new. No idea what is out of kilter... Specs 110 sw 300 tdi, r380, lt 230 (1.4), 32" tires, stock gearing. Thoughts?
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  #2  
Old May 4th, 2012, 01:29 PM
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Is this the first time your checking it or do you have previous numbers? Also what was the top speed you where running during this check?
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Old May 4th, 2012, 01:38 PM
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that mpg is poo poo. timing/injectors/transmission brake misadjusted and grabbing or other friction in your driveline?
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Old May 4th, 2012, 01:51 PM
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Truck freely rolls...not the e-brake. Will have to check the other items.

Economy has hovered around 17mpg the last several times I checked.

Average speed was about 60 ish on highway.
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Old May 4th, 2012, 01:53 PM
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lift it up and try and spin the axles. Tire pressure???
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Old May 4th, 2012, 02:01 PM
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If it's new to you, maybe the PO played with the injection pump. Check the diaphram to see if that anti-tamper cap has been removed. If so, you may have to readjust the 3 controls to get back to reasonable fueling.
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Old May 4th, 2012, 02:07 PM
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And the top speed was 77...downhill with a tail wind.

Will check the items noted. Any one in NoVA area know how tof check tdi timing and the injection pump mixture?

Thanks!
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Old May 4th, 2012, 02:24 PM
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Colin - this sounds like a good project for the next HH. Bring her on out.
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Old May 4th, 2012, 02:28 PM
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Assuming that the truck seems to run fine otherwise, have you considered a fuel leak?

Do you have a puddle of black stuff underneath the truck after a long drive? Usually this occurs when fuel leaks drop onto the front driveshaft and spray all over the undercarriage.
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Old May 4th, 2012, 02:58 PM
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There isn't a puddle under the truck (...and no, it's not empty...I checked. ha)

The truck has decent power and will hold 70mph on the flats. Speed falls fast on slight grades (under 2%).

This would be a good HH conversation.
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Old May 4th, 2012, 03:07 PM
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Quote:
Originally Posted by 97XD View Post
This would be a good HH conversation.
We located that snapped manifold stud the last time it was out!
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  #12  
Old May 4th, 2012, 03:12 PM
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I'm not sure 70mph on the highway will get you stellar economy. I notice a big drop off with 60 versus 70 with every engine. Don't think that you should be getting 30mph either. Especially at 70 mph w/ a 1.4 t-case. Seventeen average seems low but you should try a highway run at 60 mph as a baseline as driving styles for everybody are different. A long highway drive at 60mph and no faster will allow you to see exactly how its performing.
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Old May 4th, 2012, 04:41 PM
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Quote:
Originally Posted by mgreenspan
I'm not sure 70mph on the highway will get you stellar economy. I notice a big drop off with 60 versus 70 with every engine. Don't think that you should be getting 30mph either. Especially at 70 mph w/ a 1.4 t-case. Seventeen average seems low but you should try a highway run at 60 mph as a baseline as driving styles for everybody are different. A long highway drive at 60mph and no faster will allow you to see exactly how its performing.
I'll try this too!
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  #14  
Old May 4th, 2012, 08:31 PM
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All the 300's I have had have given better than 20mpg, most are in the 23 neighborhood. Do you have a lot of black smoke? If you play with the injection pump to maximize power your mpg will go down. As mentioned above the last owner could have played with the pump. You could also have a less than good spray pattern on the injectors? I had taken one of my pumps to Vally Fuel Injection in Lynchburg to do a rebuild. The truck seem to run well with the re-worked pump. The will also test and clean your injectors.
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Old May 5th, 2012, 08:51 AM
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Quote:
Originally Posted by MC22958
All the 300's I have had have given better than 20mpg, most are in the 23 neighborhood. Do you have a lot of black smoke? If you play with the injection pump to maximize power your mpg will go down. As mentioned above the last owner could have played with the pump. You could also have a less than good spray pattern on the injectors? I had taken one of my pumps to Vally Fuel Injection in Lynchburg to do a rebuild. The truck seem to run well with the re-worked pump. The will also test and clean your injectors.
There is a puff of heavy black when the engine starts. While driving I can see faint black smoke when um going up hill and giving more throttle...which I understand to be normal.

To this point I have not touched the injection pump, but the previous owner could have.

I know I won't get 30mpg out of it, but would like to average in the low to mid 20s if possible.

Will have the injectors and pump serviced at some point but not until I have a concrete diagnosis of the problem.

One thing I just remembered, some times there is white smoke coming from the exhaust until the engine warms up. This only started when I reconnected a hose that was loose. the hose comes off the engine near the valve cover and reconnects into the air intake...which seemed strange. when I start it and let it idle for a few the white smoke is less prevalent, and eventually goes away (takes about 5 minutes our so). The smoke doesn't look blue in any way, so I don't think it is oil being burned, but considering the hose I reconnected I don't know for certain.

Thanks for the replies everyone.

Collin
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  #16  
Old May 5th, 2012, 10:48 AM
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You should get nearly 500 miles to a tank full of diesel.
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Old May 5th, 2012, 11:45 AM
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Quote:
Originally Posted by mikeslandrover View Post
You should get nearly 500 miles to a tank full of diesel.
what??? how big is your tank? show me your math!
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  #18  
Old May 5th, 2012, 11:50 AM
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My 300TDi is hooked up to a Zf4hp22 & a LT230Q, 1.22 and standard diffs & 31" AT/KO's. I get 22-23 mpg around town and highway @63mph, so with your 1.4 TC and big tires, I suspect you would be around 20. If you're punch'n the petal at every "GO" light trying to keep up with the gasser's, your fuel economy will suffer greatly. To get the best performance, you really need an EGT and boost gauge to make you aware of your economical use of your right foot. Going up hill with your foot to the floor won't get you there any faster than 1/2 throttle, higher rpm's (better air flow) in 3rd gear.
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Old May 5th, 2012, 12:24 PM
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Quote:
Originally Posted by tommyd View Post
what??? how big is your tank? show me your math!
1 imperial gallon =4.54609188 litres
tank holds 80 litres = 17.6 imperial gallons
My 200tdi averages 30 mpg ( usually more) - 110 station wagon.
17.6 x 30 = 527.93 miles
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Old May 5th, 2012, 01:34 PM
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Quote:
Originally Posted by Dennis
My 300TDi is hooked up to a Zf4hp22 & a LT230Q, 1.22 and standard diffs & 31" AT/KO's. I get 22-23 mpg around town and highway @63mph, so with your 1.4 TC and big tires, I suspect you would be around 20. If you're punch'n the petal at every "GO" light trying to keep up with the gasser's, your fuel economy will suffer greatly. To get the best performance, you really need an EGT and boost gauge to make you aware of your economical use of your right foot. Going up hill with your foot to the floor won't get you there any faster than 1/2 throttle, higher rpm's (better air flow) in 3rd gear.
Good input. I've definitely changed my driving style in the 110, but haven't perfected it. the additional gauges are on my short list of parts to order. how much boost is normal for a stock 300? What is the danger temp to avoid on the egt? I know I can look this up but forum recall is faster than searching from my phone.
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