| Author |
Message |
    
Jim Kemp (Jimkemp)
| | Posted on Wednesday, September 11, 2002 - 09:52 pm: | 
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I need some help, My 98 Disco LSE 4.0 has a terible hesitation when I travel at cruising speeds (60-70mph)for any length of time. The car will stutter several times repetitively and then it goes away. I have replaced the fuel filter, plugs (with bosch platinum +4), and plug wires (magnecore competition). Still, the problem continues. I also took the car to Autozone to see if any codes had been made. I thought maybe it was the o2 sensors, but there are no lights on and no codes came up. I'm stumped and need help. I'm getting frustrated. Thank you for any replies. |
Conor Furr
| | Posted on Thursday, September 12, 2002 - 12:15 am: |
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Ive got the exact same problem on my 96 SD. mine did finally tell me that one of my cats was going bad, so i am getting them replaced next week. hopefully that will solve the problem. id like to here of any solutions that you come up with. thanks.
conor |
hendrik
| | Posted on Thursday, September 12, 2002 - 01:49 am: |
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I´ve read a few times that the ignition amplifier module (with pre-GEMS injection systems) causes intermittent ignition failure when being faulty and warm. Very annoying and hard to prove without trial-exchange. I would bet on the ingnition system (coils) or fuel supply but have not enough experience with the V8 (especially if as new as yours) to tell you.
What I would try (if nobdy on this boards knows a clue) is to contact RPI (www.rpiv8.com) or mark adams in GB ([email protected] if I remember it right). They deal with these things on a daily basis obviously. Hopefully they would have time to answer an e-mail.
I´ve been told the o2-sensors behind the cats only monitor its function and their information is not used by the ECU to modify ignition and fuel injection. If so, a faulty cat should breathe out bad fumes but must not influence the engine running. |
MarkM
| | Posted on Thursday, September 12, 2002 - 08:44 am: |
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I would check the speed sensor before anything else. Sounds very familiar. |
ken knebusch (Charlotterover)
| | Posted on Thursday, September 12, 2002 - 09:10 am: |
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speed sensor |
Danno (Danno)
| | Posted on Thursday, September 12, 2002 - 09:24 am: |
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i'll third the Speed sensor
does it stutter or does it feel like full is cutoff? when it "stutters" and you give it gas what happens? |
Conor Furr
| | Posted on Thursday, September 12, 2002 - 11:29 am: |
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When it happens to me, the engine will seem to cutoff, and my speed will drop about 5mph. if i leave my foot on the gas while it does this the rpm's will not move either, they stay at what it was at when it cut out. kinda like what a governer would feel like.
conor |
Danno (Danno)
| | Posted on Thursday, September 12, 2002 - 11:41 am: |
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that's what happens with a faulty VSS. |
Conor Furr
| | Posted on Thursday, September 12, 2002 - 12:08 pm: |
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anyone have the part number for the VSS? thanks
conor |
petern12
| | Posted on Thursday, September 12, 2002 - 02:08 pm: |
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AMR1253 (YBE100540)
$76 at roverconnection.com |
Joshua Smith (98hoo)
| | Posted on Thursday, September 12, 2002 - 04:48 pm: |
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Cheaper from Nathan at Discount Rovers. I agree with the VSS. Just replaced mine and it fixed the problem described. |
Jim Kemp (Jimkemp)
| | Posted on Thursday, September 12, 2002 - 09:16 pm: |
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Thank you all very much for your responses. I'm assuming the VSS refers to the speed sensor. Where is the VSS located and is this something I can change myself. I am comfortble with working on cars but I am no Mechanic if you know what I mean. To answer Danno's question, it is more of a stutter, however, when it occurs and I depress the gas pedal down further, the stutter lasts longer and the motor sounds bogged down. I am also ordering a cable to connect the OBDII computer to an old laptop so if the VSS doesn't work I can maybe diagnose the problem as it is happening. Last question, what does the VSS control and what does it do? Thank you all again. |
Danno (Danno)
| | Posted on Thursday, September 12, 2002 - 10:04 pm: |
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the VSS provides road speed data to the ECM (Engine Control Module). i believe that the VSS is a hall effect sensor and when it loses it's signal, the ECM thinks the Disco is going faster than it should and the fuel is cutoff to save the engine.
it's on the left side of the xfer case near the parking brake |
Jim Kemp (Jimkemp)
| | Posted on Thursday, September 12, 2002 - 10:57 pm: |
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Thanks again, I ordered the part tonight from roverconnection.com and it ships in the morning. I'm looking forward to having the problem resolved. Its been doing this since early July. I just found this site a week or two ago. I'm really pleased to have a place to get great answers to my problems. This is my first high milage car and I expected to have some problems with it, but now I know where to turn. Thank you all. Your expertise is appreciated.
Jim Kemp |
charles pastrano (Charles)
| | Posted on Thursday, September 12, 2002 - 11:51 pm: |
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Try a can of BG44k. So far no stutter problems. If it happens again I will get VSS. $24.00 at the dealer.
Charles |
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