I haven't had time to fully diagnose this, but I have a 95 Disco. 145k. Had a tuneup in the last 7-8k (Plat Plugs, Magnecors, O2 Sensors, etc.. from Mikes 60K Service List).

A year ago, I was having problems with very rough running, wouldn't even stay running most of the time. Finally tracked it down to to a bad Fuel Pump. Replaced the Fuel Pump and all was well. (also replaced fuel relay and fuel temp sensor)

Now about a year later, it is misfiring. The problem started about a month ago, when it was cold, it would run rough. Now it runs rough (misfiring) all of the time. There is no CEL on, so no codes.

I tested the Fuel Pressure tonight and it was about 39psi. Visually inspected the wires and didn't see anything.

Ran out of daylight, so I figured I would ask here. What do you think? What have I left out?

Thanks

 

I'm just spitballing here, but does the CEL light up for it's little check when you turn the key on?

Does the CEL even flash during misfire on the DI's?

 

does this only happen when its cold, does it go away when it warms up? 95s have a much less precise calculation for misfires, so it has to be pretty bad before it throws a code. but when does it miss, idle, under load, hot cold? lots of possibilities with this one

 

I could use some help with this on my '00 DII (106K) My issue began about a month ago, when I start it up from cold it runs rough, but settles down after a couple of minutes of driving. I had a few days where it would misfire under acceleration so when I changed the oil a couple weeks ago I did a seafoam induction cleaning off the small vacuum line opposite the throttle body. I also ran a bottle of seafoam in the gas tank. Things are have improved, but I still have a rough idle when first started when the engine is cold. I replaced plugs and wires about a year or go, 8mm Magnicores and +4 plugs. Like mattrickman my CEL is off. It was on for a couple of days after the induction cleaning. Boy you guys weren't joking about the smoke!
What should I check next? Thanks

 

Matt, PM me your tele number, I'll call you.

 

It happens all of the time, cold, warm, idleing, under load etc...

The CEL does come on at start up and then goes out.

Mike - I will give you a call this evening.

 

i have an 03, 90k miles, new magnecore wires, and new plugs, i cant remember what plugs i used, ill check tomorrow.

i have no CEL, runs/idles fine, under normal driving. but during harder acceleration, under load, it seems to sputter/possibly misfire, what could cause this?

since i have gotten this last march, i replaced the valve cover gaskets, upper intake plenum gasket, magnecore wires, plugs, throttle body heater plate kit. and the transfercase fluid, diff oil was clear as can be in both diffs. and i use rotella 15w40 oil with mobil1 301 extended filter.

it only sputters under heavier load while accelerating hard.