Slowly losing gas/diesel milage
 

Hey everybody, long time no talk, the season is starting to slow down for me so I thought I would look up the forum again.

problem, slowly losing milage on my 95 PSD was at 20/19 and now getting around 17-18.

just took my truck to the shop for a glow plug (one was shot) hard to start on Canadian mornings.

Kwik you might have an opinion or suggestion, but I do have a question for you, Kwik, how would I know if an injector is going or to test an injector myself/and replace the part.

Hey DYDF250, i occationally have the same problem. I start loosing mpg and notice a little smoking on cold mornings. I have discovered that if i reset the brain, it stops smoking and gets back to 19 or 20 mpg. You know- the disconnect the batteries for 15 minutes thing. Dont know if this is your problem but it works for me.

1994 1/2 f350cc

i wouldnt complain about 17-18:-roll . that is very good. maybe your filters are at the end of there life????????

I wish that I could get that good on my mileage. I get 13 at best. 1997F-350 has a good point. How old are your filters?
Injectors will fail by producing an engine miss, or a severe engine knock are a couple of symptoms.

when did yall switch to winter blend or strait #1 fuel? thoose numbers are about what you will loose on winter fuel. but again like 1997 said filters and oil can play a part of it also.

Colder weather alone will decrease your mpg's and going to winter grade fuel will cut it back even more. That might be an additional cause besides the filters. Cold weather on regular 15-40 cuts it down even more. Gotta love winter!

Thanks For the replys,
Filters that have been changed, oil and fuel fltrs, any others?
As it is rough up here Canada I use a Synth 5W 40 year round and have had great luck with the product I can get 8000 km to 10000 on a change up.

Kwik,
Engine miss with a deisel sounds like or feels like?
Mileage, I do alot of hiway miles not alot of in town BS
plus dont you have a plow business and haul a big A** trailer around

Today I had my Cat pulled from the pipe I'll see how that goes, any comments

MB

It sounds the same as an engine miss on a gasser. One cylinder drops out. RRRRRRR_RRRRRRR_RRRRRRR_RRRRRRR with a rocking motion from the engine assembly

When was the last time you changed the AIR filter? Don't believe the idiot gauge (if you have one). If Over 10-15K on last change I would go ahead and change it. Even a little dirt or stuff on filter will make a difference on fuel mileage.

Oh ya Air Filter, Is a K & N and I have cleaned it out about 1000-2000 Kms ago, the idiot gauge is non functioning, as most I guess.

thanks Guys
I need to start a new thread on Glow plugs.I have some questions

Hmmmm...sounds like what my truck is doing. Getting poor milage as of late, how does a cheapo determine if they have a duff injector? I don't have to coin to do a pop test of all of 'em.