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Discussion Starter · #1 ·
I have a 96 Disco, there is no patern to this problem that I quess I can detect so far it just seems to randomly be happening now. Below is problem and more problems.

When I am driving it all of a sudden feels like the engine is loosing power and start sputering the engine hasnt died or anything yet. if I floor the pedal doesnt do anything just stays the same some times it will drop a gear and go for a sec then same thing.

If I stick it in neutral when that happens the engine will rev normal like nothing is wrong but as soon as I put it in gear it happens again then it will just kick back to normal some times and start working other wise I play with gas a little or let go stick in neutral and coast a little then put it back in gear or step on gas real hard and it starts working again.

I have replace and regaped all the spark plugs and wires.

I have also done obd reading and got the following errors:
Misfire on cylinder 7
Multible misfire on multible cylinders
and something about a low reading from the catalitic converter.

I have check the wires and plugs again havent reset the obd to check but problems are still happening anyways.

Now I am not sure if there is a rotor because the plugs just plug in a row between the engine and the firewall so I think its a coilpack?? or something like that right?

So the 3 things I havent not tried yet and what seem to be what other people on this forum have tried are:

1. replace fuel filter.
2. replace speed sensor.
3. replace coilpack.

Does anything think any of thouse is what I should be changing? from what I have described about my problems?

If so which should I start with and order would be the opionion of everyone?

Or is there something else I can try?

Like on the speed sensor can I just disconect it with out a problem to see if that works or does it need to be connected?

I have a fuel filter just am getting to the edge on replaceing things that dont need to be replaced for problems they are not causeing.

Any help would be greatly apriciated.

On a good note my cruise control wasnt working and I replaced the vacum tubing completely and now its working great. ecept when engine starts acting wierd.
 

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sounds like the problems i had a couple weeks ago, needed a fuel pump... go to a mechanic you know and trust (no dealer!!) and have them check the fuel pressure... it should be around 35-40 (correct me if i'm wrong, i think this is what it should be... mine was about 25 when i was experiencing problems)... how many miles on your disco? has the fuel pump ever been changed? mine started to go at 87,000 so i figure it was about time! i hope this helps, it sounds like you are at the end of your rope on patience, and i don't blame you!! just remember, to your truck, this is a fun game!! :lol:
 

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Discussion Starter · #3 ·
I have around 115k on her now. I have never changed the fuel pump but I got it secound hand so not sure if it might have been done in the past. I guess I will change the fuel filter out tomorrow. See if that helps if not then I guess try the fuel pump.

Also forgot to mention that when it happens nothing weird happens with my speedo as I read in some previous posts.

I was looking in the electronic workshop manual and was just wondering after reading some stuff if it could be possible my timming is off ?

Do discos have timing chains or belts or something like that?

ilovemydisco where you getting misfires?

Thanks :drive:
 

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It could also be VSS( vehicle speed sensor). Misfire codes, sure bet!! $100.00 part and 10min. fix. I had that problem for a year until I figured it out. I will try to find the post, or atlest the write-up!

Ok here atleast is the write-up! Credit to someone on this forum, Sorry, can't remember who, just know he is from Chicago..


An intermittent VSS fault is identified by a freeze frame speed of above 110 mph (an input to GEMS caused by a noisy signal from the VSS), complaints of intermittent power loss, or engine stall.

NOTE: On TestBook disc DRG 0001 and DRG0002 the road speed displayed as "MPH" is actually a kilometers per hour value, NOT miles per hour. A TestBook reading of "177 MPH" is actually 177 kph. This reading, when converted to the desired mile per hour reading, is 110 mph.

One of the functions of the VSS signal to the GEMS unit is to provide information on vehicle speed. If the GEMS unit sees an excessively high speed (above 110 mph) it will initiate fuel cut off to the odd cylinders momentarily to reduce engine power. This feature is intended to prevent the driver from operating the vehicle at excessive road speeds.

Customer complaints of intermittent engine surging at highway speeds, inoperative or fluctuating speedometer, or a MIL illumination could be caused by an intermittently failing VSS.

If the MIL is illuminated with misfire codes P0300, P1316 and any combination of P0301, P0303, P0305 and P0307 stored or if the customer complaint is surging, hesitation, or loss of power at highway speeds, pay close attention to the freeze frame data, particularly engine rpm and road speed.

NOTE: As with all electrical diagnosis, the circuit between the sensor and the GEMS unit should be checked. The technician should be aware of the fact that the sensor test will not detect an intermittently failing sensor.

If the freeze frame data shows a road speed that does not conform to the engine speed (for example 110 mph at 2000 rpm or a road speed of 0 mph), an intermittent fault with the VSS could be the problem.

If inconsistencies between engine speed and vehicle speed are observed, replace the sensor. See attached DTCR samples
 

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Discussion Starter · #5 ·
Is it possible for me to just disconnect the VSS to see if it is acthully the problem? or will that not work?
 

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Yes, of course you will loose the spedo, and odometer, but, oh well atleast you will know!
 

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Discussion Starter · #8 ·
no it starts great and idles great. by misfiring is what the obd is telling me when I hook one up. Or I guesss maybe its whats happening when I am driving.. but engine sounds ok.
 

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Discussion Starter · #10 ·
well I went and bought a VSS didnt put it on yet because I spent all day changing or trying to change my fuel filter. the peices to unscrew where rusted all into one peice.. ended up haveing to cut it all off and go get new hose finaly got it on.. just a little while ago.. I think the fuel filter must have been original and looks like it was from UK. Anyways I got new one on engine acthully feels a little more responsive i think or maybe its just the sun getting to me. But i will take it for a spin tommorrow see if I can get it to glitch if it does then I will try the VSS.
 

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Discussion Starter · #11 ·
Well I drove a good couple hundred miles today and didnt have any problems since I have put the new fuel filter on.

Of course it could just be a good day.

I hope that was all it was but if not I will let everyone know.

Thanks.
 

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Changeing the fuel filter was the first thing that I did, when the surges started. Mine I think was the original too. I changed it at 89k. WOW what a difference, but it didn't stop my surges. They were tricky on me. I really hope that was all your problems, but I wouldn't bring that VSS back just yet. I am sure you will need it in the future! Good luck!!!
 

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Discussion Starter · #13 ·
Well the fuel filter seemed to work but after getting on the road and driving a while up to Yellowstone it started acting up so I put in the new VSS and havent had problem since... So I guess that what it turned out to be...
 

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aaaarrrrrrgggghhhh...

ok, I've had all the same problems that are mentioned above. I have replaced spark plugs, fuel filter, fuel pump, mass airflow sensor, and o2 sensor that came up lame on the computer. I replaced the tires last year, and while that helped for a while, the problem came back. I also just replaced my shocks, no dice. I just today unplugged the VSS, but there was still some hesitation going up a slight incline around 60 mph. It is especially prevelant when I have to take my foot off of the gas and then back on in a somewhat quick manner. If I play around w/ the acc pedal, it goes away until the next incline. This is highly annoying. Any help would be greatly appreciated as I'd rather figure this out b/f I take it to the dealer and get raped while they try to figure out what is wrong.
 

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Seafoam...

The seafoam method worked...purchased at napa. Pour one can in the gas tank, one in the oil, and one directly into one of the vacuum tubes for the engine air flow (intake manifold). When you pour it into the intake manifold make sure you use a funnel and pour slowly or the engine will die. Btw - it will seem like your entire engine is on fire and there will be while smoke everywhere, but it's really just cleaning all the crap out of your engine. After i did this, i never had another problem again! You can search "seafoam" in this forum and find more detailed instructions w/ pictures...
 
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