High Speed Stalls - Land Rovers Only

Pilot58D · 03-13-2005, 04:11 PM

Hello,

Have a 97' Disco. When I'm at cruise speed (70's on interstate). I sometimes get a momentary stall for a brief second. This may only occur once during a 4 hour trip (which I do often) today it seemed more pronounced and would stall, run, stall, run, stall, run (almost bucking) but went away. It doesn't occur at low speed and isn't associated with any kind of acceleration or power demand.

Any help to get me looking would be great,
B.

rov'n · 03-13-2005, 05:05 PM

sounds like a bad lockup solinoid...

Disco · 03-13-2005, 07:03 PM

Hmmmm. The symptoms you describe could be caused by a variety of things. Check the following:-
Vacuum leak, restricted fuel (clogged injector/fuel filter) and ignition system.
Personally, I'd check the ignition initially. Make sure all your spark plug/coil leads are secure. It's also possible that the leads are due for replacement.

Pilot58D · 03-13-2005, 07:07 PM

The RPM decreases too, almost like its about to die, but then it comes alive again all in a second...I was thinking a lock-up would cause a jump in RPM when I got the delay? I really just don't know...

Disco · 03-13-2005, 07:36 PM

Now we have a different situation. RPM decrease is suddenly is usually due to the alternator playing up. It is possible that at high speed it is not charging sufficiently. You can test this a couple of ways. You could run the car then turn on your lights. If the stumble gets suddenly worse, it's the alternator. You could also test it for voltage. If it's working properly you should get a reading around 13.8 to 14-volts.

Pilot58D · 03-13-2005, 08:08 PM

Disco,

I did look under the frame at the fuel filter, I was trying to find a way to replace it (looks like previous owner tried, but then gave up) meaning the nuts around it have been mangled and I was afraid of breaking the connection until I figured out a solution. I see a fuel filter repair kit from DAP. I figure that is to replace the hose and nut assembly (one place to start). I had a MG long ago and the filter was dirty and when it got hot it would start to stall (high fuel demand).

rov'n · 03-13-2005, 11:25 PM

never mind my post, i was thinking along diffrent lines

Disco · 03-14-2005, 12:10 AM

Still check the alternator. Revs dropping at the same time as the surging is not related to fuel problems.

Pilot58D · 03-14-2005, 06:24 AM

Will do, thanks...

Hank · 03-14-2005, 07:23 AM

Carbon

Brutus · 03-14-2005, 09:56 AM

It may be your vehicle sensor if it is only doing it at highway speeds.

Brutus

parthog · 03-14-2005, 10:56 AM

Sounds like the speed sensor, located at the rear output of the transfer case, sypmtom would include the speedometer dropping while the engine is not running and resuming normal reading when the engine cuts back in.

- Jeff

Pilot58D · 03-14-2005, 12:34 PM

I know I'm dumbing it down, but there has been occasional jumps in the speedometer, would that also affect the running? just never got the 2 symps at the same time. The only thing that has ever caused was the cruise control cutting off. Are we talking the speedometer transducer or the other (name slips me)...Cleaned the Carbon (going to do it again, heavy as routine maint)

Thanks,
B.

dent · 03-14-2005, 12:50 PM

a person here had the same problem, (hey eric) he found that the problem was with the VSS. his suggestion was to unplug the vss and take it for a boot. though you'll not have any speedo so follow the speed of traffic. also if you look at your odometer, you'll notice it doesn't move while you have it unplugged (hint hint to leasesse). the vss is located just behind the transfer case and the parking brake.. or was it after the parking brake. either way crawl under and you should see it
take care
sam

Pilot58D · 03-14-2005, 05:40 PM

I've seen another reference to the sensor, VSS is that teh same as teh transducer that send the signal to the speedometer? Also, If I unplug it what should the result be? Normal operation?

I have lost the signal to the speedometer before but I didn't get the momentary loss of power...

Thanks for all the input keep it coming...all of these are easy checks so I can do them all...

B

03-13-2005, 04:11 PM	#1 (permalink)
Pilot58D Member Join Date: Mar 2005 Posts: 8 Gallery: 0	High Speed Stalls Hello, Have a 97' Disco. When I'm at cruise speed (70's on interstate). I sometimes get a momentary stall for a brief second. This may only occur once during a 4 hour trip (which I do often) today it seemed more pronounced and would stall, run, stall, run, stall, run (almost bucking) but went away. It doesn't occur at low speed and isn't associated with any kind of acceleration or power demand. Any help to get me looking would be great, B.

03-13-2005, 05:05 PM	#2 (permalink)
rov'n Senior Member Join Date: Dec 2004 Location: Lincoln,NE Posts: 229 Gallery: 0	sounds like a bad lockup solinoid... __________________

03-13-2005, 07:03 PM	#3 (permalink)
Disco Super Moderator Join Date: Dec 2004 Posts: 1,819 Gallery: 0	Hmmmm. The symptoms you describe could be caused by a variety of things. Check the following:- Vacuum leak, restricted fuel (clogged injector/fuel filter) and ignition system. Personally, I'd check the ignition initially. Make sure all your spark plug/coil leads are secure. It's also possible that the leads are due for replacement. __________________ No hand signals, driver playing with his transfer Knob.

03-13-2005, 07:36 PM	#5 (permalink)
Disco Super Moderator Join Date: Dec 2004 Posts: 1,819 Gallery: 0	Now we have a different situation. RPM decrease is suddenly is usually due to the alternator playing up. It is possible that at high speed it is not charging sufficiently. You can test this a couple of ways. You could run the car then turn on your lights. If the stumble gets suddenly worse, it's the alternator. You could also test it for voltage. If it's working properly you should get a reading around 13.8 to 14-volts. __________________ No hand signals, driver playing with his transfer Knob.

03-13-2005, 11:25 PM	#7 (permalink)
rov'n Senior Member Join Date: Dec 2004 Location: Lincoln,NE Posts: 229 Gallery: 0	never mind my post, i was thinking along diffrent lines __________________

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03-13-2005, 07:07 PM	#4 (permalink)
Pilot58D Member Join Date: Mar 2005 Posts: 8 Gallery: 0	The RPM decreases too, almost like its about to die, but then it comes alive again all in a second...I was thinking a lock-up would cause a jump in RPM when I got the delay? I really just don't know...

03-13-2005, 08:08 PM	#6 (permalink)
Pilot58D Member Join Date: Mar 2005 Posts: 8 Gallery: 0	Disco, I did look under the frame at the fuel filter, I was trying to find a way to replace it (looks like previous owner tried, but then gave up) meaning the nuts around it have been mangled and I was afraid of breaking the connection until I figured out a solution. I see a fuel filter repair kit from DAP. I figure that is to replace the hose and nut assembly (one place to start). I had a MG long ago and the filter was dirty and when it got hot it would start to stall (high fuel demand).

03-14-2005, 12:10 AM	#8 (permalink)
Disco Super Moderator Join Date: Dec 2004 Posts: 1,819 Gallery: 0	Still check the alternator. Revs dropping at the same time as the surging is not related to fuel problems. __________________ No hand signals, driver playing with his transfer Knob.

03-14-2005, 06:24 AM	#9 (permalink)
Pilot58D Member Join Date: Mar 2005 Posts: 8 Gallery: 0	Will do, thanks...

03-14-2005, 07:23 AM	#10 (permalink)
Hank Banned Join Date: Feb 2005 Location: VA Posts: 914 Gallery: 0	Carbon

03-14-2005, 09:56 AM	#11 (permalink)
Brutus Member Join Date: Feb 2005 Location: Mobile, Alabama Posts: 49 Gallery: 5	It may be your vehicle sensor if it is only doing it at highway speeds. Brutus __________________ AAWWWW!!!! He wants to go off road!! Fear profits a man nothing!

03-14-2005, 10:56 AM	#12 (permalink)
parthog Member Join Date: Jan 2005 Posts: 47 Gallery: 0	Sounds like the speed sensor, located at the rear output of the transfer case, sypmtom would include the speedometer dropping while the engine is not running and resuming normal reading when the engine cuts back in. - Jeff

03-14-2005, 12:34 PM	#13 (permalink)
Pilot58D Member Join Date: Mar 2005 Posts: 8 Gallery: 0	I know I'm dumbing it down, but there has been occasional jumps in the speedometer, would that also affect the running? just never got the 2 symps at the same time. The only thing that has ever caused was the cruise control cutting off. Are we talking the speedometer transducer or the other (name slips me)...Cleaned the Carbon (going to do it again, heavy as routine maint) Thanks, B.

03-14-2005, 12:50 PM	#14 (permalink)
dent beer drinking member Join Date: Aug 2004 Posts: 322 Gallery: 0	a person here had the same problem, (hey eric) he found that the problem was with the VSS. his suggestion was to unplug the vss and take it for a boot. though you'll not have any speedo so follow the speed of traffic. also if you look at your odometer, you'll notice it doesn't move while you have it unplugged (hint hint to leasesse). the vss is located just behind the transfer case and the parking brake.. or was it after the parking brake. either way crawl under and you should see it take care sam

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03-14-2005, 05:40 PM	#15 (permalink)
Pilot58D Member Join Date: Mar 2005 Posts: 8 Gallery: 0	I've seen another reference to the sensor, VSS is that teh same as teh transducer that send the signal to the speedometer? Also, If I unplug it what should the result be? Normal operation? I have lost the signal to the speedometer before but I didn't get the momentary loss of power... Thanks for all the input keep it coming...all of these are easy checks so I can do them all... B

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