95 still runs rough not happy. - Diesel Forum

riceburner · 07-05-2008, 11:05 PM

I have been making changes to my 95 E-350 to try to help a rough running problem, and it is getting better, (but not fixed).

Everything I have done has helped a little, but I am afraid that I am missing the main problem. I need some help.

Fuel pressure was low, around 35lbs, put in a new pump now its 65, (what a crummy job that was) that helped, cleaned the screen that was about 3/4 blocked on the filter, that helped too.

Changed back to the Castrol 15/40 diesel oil that I have been using for years, that helped some too.

But it still is running rough mostly at mid-range rpm, high rpm its better, but is lacking any power for pulling hills with the trailer like it use to do.

At 120k miles I dont think the motor is tired yet. I would think that it could be an injector problem, but if an injector is stuck wouldnt I be getting alot of smoke from the exhaust, currently there is none.

If it is down on boost how will the motor act, or this new EPA happy diesel?

Could I have put the fuel filter in wrong? (I followed the instructions).

Thanks for all the suggestions I have had in the past.

Confused in Costa Mesa.

blageurt · 07-06-2008, 06:31 AM

Did you change the air filters? Is the MAP sensor OK ? Are all intake boots tight ? How much Boost are you making ? Check Turbo wheel for Nicks / Sandblasting . Maby you need new UVC harnesses. Are you getting any codes ?

riceburner · 07-06-2008, 12:52 PM

Is there a way to test the Map sensor without just replacing it? Air filters are clean, turbo didnt have any nicks in it. The intake is all stock (and tight).

I dont know on how much boost it is making. Will low boost result in poor running at crusing and mid throttle?

Can I check for codes without any special tools?

Thanks much

s.r.

blageurt · 07-06-2008, 04:22 PM

YES for the MAP , try unplugging it for a day or so to see if mileage improves , also maybe you EBPV is sticking or you EBPV sensor is malfunctioning , all of these affect mileage /performance
I bought one for nothing too 127 bucks I think it was . . At least I have a SPARE . . .
As far as codes go you need a good scan tool if you plan on keeping the truck you should buy one like Auto Enginiuty or AutoTap or a good Actron one (they are all 200-400 bucks ) or Pay the 100 bucks each time to the meccanic . FOR ME IT WAS A NO BRAINER After ythe first scan I bought one right away . Best 400 bucks I ever spent outside a Strip Joint . . . You should try to find out how much boost you are making , it should max out at 14-17 PSI . Good Luck

riceburner · 07-07-2008, 08:38 PM

Thanks for the reply,

I put a guage on the line that goes to the map sensor, I am seeing less than 10lbs of guage, but it is suspect, I will get a new one tommorow.

How or, will the MAP sensor effect the boost pressure?

Replacing the air filters with a new set of K&Ns' helped, but still rough.

Slowly but surely it is getting better, its just not good.

Did I mention to that it doesnt smoke at all.

thanks again

blageurt · 07-08-2008, 12:06 PM

The Map sensor does not aaffect the boost .It tells the computer HOW MUCH boost you are making so it will deliver the correct amount of fuel . So if Map Sensor is faulty you get poor mileage /performance. MAXIMUM Stock boost is 14-17 psi under load . . .
Replace the line with quality diesel rated hose and change the clamps to the screw type . If you are getting low boost you have a leak OR Turbo Impeller is Toast . . . Mayby you have an exhaust restriction (Clogged Cat) /exhaust leak ? OR you need new Up-pipe donuts. Check for soot areound the Up-pipies Exhaust Manifolds .

riceburner · 07-08-2008, 09:39 PM

Does the 95 have a Cat?

Super_Dave · 07-08-2008, 11:28 PM

My '96 didn't have one.

blageurt · 07-09-2008, 10:56 AM

My 95 has one which will be going on permanent vacation very soon

riceburner · 07-09-2008, 06:59 PM

Well, I got a new boost guage and it reads alot different than the questionable one (guess that is why its called that).

As hard as I can put my foot in it around here (Costa Mesa) it peaks at about 15lbs, at 65 cruising 3 or 4, mid throttle around 10 or so.

I am assuming from what I have read that on a stock one that is about right for this turbo.

On to more.

s.r.

riceburner · 07-10-2008, 10:46 PM

I crawled up under my van, and yes in front of the muffler there is another rather large cannister, that I will have to assume that it is the Catylitic convertor.

So, they will can get clogged? most of my miles have been on the freeway with a trailer, hard to beleive that it would get loaded up. Stranger things have happened though.

How is replaced, just a pipe?

blageurt · 07-11-2008, 11:53 AM

Contact warpspeedperformance.com they sell cat-delete pipes