Now What!?!?

[62Sunbeam]

So I replaced the Fuel Temp Sensor and it fixed the hot start problem and I replaced the spark plug wires as one had been damaged from touching the exhaust and all in all the disco runs OK. (took it up to the snow and it was great) But here's my new problem: Still runs sluggishly when cold and if I get on it hesitates and sputters a bit. I sometimes even hear a miss. Otherwise it runs pretty well when warmed up except it seems that the second half of the excellerator travel does little if anything. It will do 85mph on the freeway no problem but getting on the gas is a excersize in futility as it seems the engine needs to build a head of steam before it gets up and goes. The tranny seams to be a little low to knock down sometimes but I dont think that's the problem. I realize I have 185hp tring to move a 5000lb brick with all sorts of transfer cases and differencials coplicating the passage of power to the wheels but this thing won't out excelerate anything!

Thoughts and tips appreciated.

Eric
'95 Disco 166K miles

 

[joey]

Not sure what all you have done to your disco (would have to go back threw all your posts), but being that it is sluggish on the take off, I would look at Injectors, stepper motor, and you don't want to hear this, but with that many miles I would look at worn cam, or burt or carboned exhaust valves.

Since it will run 85, I doubt that it would be the Cats, but that is also a minor possiblity.

 

[62Sunbeam]

I've done the Seafoam thing in the crankcase, fed it up a vacuum line and put several bottles in the gas. Before I did that though the valves looked only a little gold to light brown from up top and I burn very little if any oil so I'm crossing fingers it's not internal. Iguess if I had more than an hour to myself these days I'd pull the injectors and do a dripdown test. Is there a way to check the functioning of the stepper motor?

Anyway Thanks

Eric
'95 disco 166k miles

 

[joey]

Stepper motor can just be cleaned.... I beleive Roverchic has posted a view of where it is located.

I also was thinking today while driving around.... this could also be caused by the timing chain getting very loose.

 

[62Sunbeam]

I don't suppose there's a way to check the timing chain for slack without opening the timing chain cover????

Eric

'95 Disco 166K miles

 

[joey]

Not that I am aware of... I know buy this time next year (115k on my Disco) I plan to replace both timing chain and the Cam. If needed, I will do a complete top end rebuild. I have a slight water leak in the back of the intake manifold, so I know I need to do the work sooner or later.

 

[joey]

I got to thinking about this issue, I wonder if this could be the issue with the rough running at start up, this only applys if your are having this issue prior to the engine warming up:

Engine coolant Temperature Sensor:

The engine coolant temperature sensor is loacted in the fron of the thermostat housing. The sensor provides engine coolant information to the ECM. The ECM increases the injector opening time when cold to provide drivability, and reduces the opening time as the engine reaches normal operationg timperature

 

[62Sunbeam]

It's funny you mention that as I replaced it last week and guess what? It did'nt fix my hot sarting problem either.

Oh well.

the firtst $6500 Takes it home


Eric

'95 Disco