Last post on Aug 23, 2011 at 7:31 AM
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Engine, Exhaust, Diesel, Hatchback, Truck, Sedan, Wagon
This topic is for diesel car and truck owners who have not been able to find satisfactory information in the forums dealing with their particular vehicles (please use SEARCH on left of page before you post here).
#118 of 166 Re: Could someone explain... [kreuzer]
May 13, 2008 (10:30 am)
Take a look at the site below. No irrational touting, just the facts. We simply do not produce enough plant and animal fats to produce enough biodiesel to replace a significant portion of the petroleum diesel we use.
Here is the one possibly real benefit of biodiesel: "Biodiesel has excellent lubricating properties. Even when added to regular diesel fuel in an amount equal to 1-2%, it can convert fuel with poor lubricating properties, such as modern ultra-low-sulfur diesel fuel, into an acceptable fuel."
#119 of 166 Re: Could someone explain... [ruking1]
May 13, 2008 (10:55 am)
See post 118. Biodiesel is a good fuel, but we cannot produce enough of it from soybeans and other high value food crops to satisfy our needs. The only hope is that new technologies will provide a new route to biodiesel which will allow currently unuseable starting materials to be used. Still the problem remains that we don't have enough bio-fats.
May 30, 2008 (5:43 pm)
have a 1991 7.3 ford diesel, so hard to start and when it dose it smokes white stuff smells like diesel and at tail pipe sounds like missing or poping, smoke settlels down after worms up, have changed all hoses and o-rings,and fuel filter, can any one help.
#121 of 166 Re: help [muncy]
Jun 01, 2008 (5:29 pm)
My 1990, 7.3 had problem starting. (Ran great after it got started) it would smoke (white) when it finally started. Had strong diesel smell. Filter change made no difference. Finally I found a very very small fuel leak in a return hose near back of engine. Replaced hose and it has started great for over a year now. Another possibility is bad glow plug/s. 1 or 2 bad glow plugs can cause hard starting also. (I am no expert. Just sharing my experiences)
#122 of 166 Re: help [orchiddj]
Jun 02, 2008 (4:32 am)
how can you tell which glow plugs are bad with out changung all of them
Jun 02, 2008 (12:48 pm)
It's best to change them all, like spark plugs. They wear out.
#124 of 166 Re: help [muncy]
Jun 05, 2008 (2:41 am)
On my 1990 the glow plugs are easily removed like a spark plug. (My book says on some models you have to remove valve covers to get at them) it probably would be best to replace them all. You can test by pulling the glow plugs and connecting to a battery. The end will ďglowĒ also it will get very hot. It only takes a few seconds for them to heat up. If any do not heat up they are bad.
I would test before replacing. I almost just replaced mine. After testing found all were good and that was over a year ago.
Jun 05, 2008 (8:26 am)
I've read that they should be replaced somewhere around 100,000 miles, give or take.
Jul 03, 2008 (10:02 am)
I have a 2004 Dodge Diesel. I bought it for towing a 35-foot travel trailer. I talked to several Dodge owners before I bought mine that were towing travel trailers and they always said they get 18 MPG towing. Mine only gets 10-11 MPG. After two years I decided to put in the Bully Dog chip and I didnít see a difference. Last year I added the K&N filter and I still didnít see a difference. This year I had them change the muffler and I still donít see a difference. I also went by the onboard MPG calculator and I now realize that with the chip itís no longer accurate. I will re-check my MPG again but calculating it by hand.
The big question is why am I not getting 18 MPG? Is there something I am missing?
Is there that much of a difference between engines? It does have a lot of power to tow the trailer. This last week towing the trailer I hand calculated the MPG and it was 10.2 MPG. The onboard computer showed 13.
#127 of 166 Re: Gas mileage [wisdodge]
by MrShift@Edmunds HOST
Jul 03, 2008 (12:13 pm)
Probably you are relying on anecdotal information from other owners, and anecdotal information can be very tricky to confirm. For instance, maybe one day one time in ideal conditions someone got 18 mpg, and then they presume to declare this the standard for the truck. Also if you have a different rear end ratio, or dual tires, this can have a big effect. And then there is the matter of what type of terrain you drive in, vs. the report from the other owners. So a guy in Kansas with a 3:55 ratio rear end is going to perform a lot better than someone in Colorado with a 4:10 rear end.
Your reports on chips and K&N and fancy mufflers only confirms my skepticism that while these things might make the car run better they are not likely to increase fuel mileage.