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  #1  
Old February 14th, 2014, 04:17 PM
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Peter
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1990 Classic

Got a 1990 Classic...had full tuneup, plugs, cap, rotor, wires, fuel filter...
When coming to a stop while car is in drive, got foot on brake, the car will idle correctly, then all of a sudden the idle will drop down and sometimes go back up, but sometimes will just shut off. If i put the car in neutral, the idle stays normal.
If anyone has any suggestions to fix, i would greatly appreciate the help.
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  #2  
Old February 14th, 2014, 04:28 PM
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is it carb or ECU? sorry know nothing about Rangies.

I would look at the VSS ... the vehicle sounds like it doesn't know if it's moving forward or not .. and isn't correctly going into idle mode.

when you shift to N ... the ECU knows for sure to start idle mode.
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  #3  
Old February 14th, 2014, 04:40 PM
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clean the upper intake where the butterfly is. Just a rag and carb cleaner is all you need. This is a very common problem.

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  #4  
Old February 14th, 2014, 06:13 PM
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Peter
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It has not carb...its fuel injected
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  #5  
Old February 14th, 2014, 06:14 PM
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Quote:
Originally Posted by McQueen View Post
It has not carb...its fuel injected
Then VSS is likely suspect.
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  #6  
Old February 14th, 2014, 06:15 PM
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I will look at the VSS. Thank you. Thats helpful.

------ Follow up post added February 14th, 2014 06:20 PM ------

Thank you too Eric. I appreciate it.
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  #7  
Old February 15th, 2014, 11:21 PM
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Anthony Nelson
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IACV probably but could also be connections under the hood. MAF connection specifically along with the ignition wires.

little dialectic grease on the connections might help.

let me know where you are in the city. i'm happy to come and have a look. i have the same issue from time to time in my classic. easy fixes.
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  #8  
Old February 16th, 2014, 11:48 AM
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Thanks...i am in and out of the city, but when i am here i am on the lower eastside...how bout you?
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  #9  
Old February 16th, 2014, 02:17 PM
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the speed transducer is fitted onto the chassis, should be on left hand side you have to follow the speedometer cable, of the five rrc that I have had never had an issue.

More likely a leaky flame trap hose if its not the stepper that motor needs a cleaning
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  #10  
Old February 16th, 2014, 02:30 PM
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Quote:
Originally Posted by roverman2010 View Post
No VSS on 1990 classic, guess again
according to the manual there is ...

http://p38arover.com/rover/p38a/Engi...UX_Systems.pdf
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #11  
Old February 16th, 2014, 02:32 PM
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Quote:
Originally Posted by roverman2010 View Post
No VSS on 1990 classic, guess again
Sure there is:

http://www.roverparts.com/Parts/AMR3386G.cfm
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  #12  
Old February 16th, 2014, 02:41 PM
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the question is why does it not go into idle mode when coming to a halt .... i would use a rover gauge to measure the output on the VSS and see whats going on.
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  #13  
Old February 16th, 2014, 03:29 PM
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Download the factory manual. Follow the procedure to check the VSS. It will take less time than reading this thread.
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  #14  
Old February 16th, 2014, 08:19 PM
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My 1990 RRC used to do the same thing. You say you've already replaced the ignition wires so you should be good there, so clean the idle air bypass valve directly off the plenum chamber along with the throttle position sensor.
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Old February 16th, 2014, 08:25 PM
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It's not the VSS




.
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  #16  
Old February 16th, 2014, 10:48 PM
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Quote:
Originally Posted by Nomar View Post
It's not the VSS .
Magic diagnosis?
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #17  
Old February 16th, 2014, 11:02 PM
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Given the symptoms it's not the VSS...if it were surging while in motion that would make sense; at idle it's likely some aspect of what's been suggested: stepper motor, and/or the upper intake needing to be cleaned, etc.
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Old February 16th, 2014, 11:16 PM
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Quote:
Originally Posted by Ray_G View Post
Given the symptoms it's not the VSS...if it were surging while in motion that would make sense; at idle it's likely some aspect of what's been suggested: stepper motor, and/or the upper intake needing to be cleaned, etc.
It's surging while not in motion ... Makes me think the ECU doesn't know it's stopped and should be controlling the idle.

When it's in neutral then the ecu knows to control idle.

If you disconnect the VSS on a truck it will exhibit similar symptoms.

That's my theory based on reading the documents about how the ECU works and observing the readings via my ecu mate.

YRMV.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #19  
Old February 16th, 2014, 11:16 PM
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I don't agree. Stalling and idling problems that change from one stop to another can be the vss. There are two idle modes. One for moving and one stopped. Of the vss does the EFI does not know which to use. If it is in the moving mode it will stumble and possibly stall.
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  #20  
Old February 16th, 2014, 11:21 PM
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Quote:
Originally Posted by leastonce View Post
It's surging while not in motion ... Makes me think the ECU doesn't know it's stopped and should be controlling the idle.

When it's in neutral then the ecu knows to control idle.

If you disconnect the VSS on a truck it will exhibit similar symptoms.

That's my theory based on reading the documents about how the ECU works and observing the readings via my ecu mate.

YRMV.
Mine have varied from that.

I've had trucks who stumble/surge while in motion, of which the VSS was one of the first things to isolate as a possible solution.

I've also had trucks who, when in gear or drive, stumble & stall at a stop-and that almost always was the stepper/IAC.
r-
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