95 RRC 3.9 - stumbling at just above idle - Defender Source
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  #1  
Old December 17th, 2014, 10:30 AM
corrumpu
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chris b
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95 RRC 3.9 - stumbling at just above idle

My RRC 3.9 has had an idle issue that I have yet to sort out. It comes and goes depending on the rover gods. Recently and in the middle of a nice running drive, it started to stumble when i was giving it just enough gas to move (above idle) Say at a stop sign or light turns green scenario.

If you give it just a bit of gas it is stumbling, surging etc. give it too little and it stalls, romp on it and it recovers immediately and from then on has no issue (until another stop sign/light)

I have worked through an IAM earlier in the summer, relocation of that, a bunk metal bosch relay for the ECU and now this! My kids will barely get in my truck for fear we won't return.

Any ideas?

Rovergauge (i don't have one or have access to one, but would this be useful? should I go down this road )

--chris
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  #2  
Old December 17th, 2014, 10:42 AM
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Russell
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Idle control valve (aka stepper motor).
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  #3  
Old December 17th, 2014, 11:06 AM
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John B.
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It can be a lot of things. You need to get the manual and go through the troubleshooting procedure.
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  #4  
Old December 17th, 2014, 11:12 AM
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Kevin Keith
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+1 on stepper… may just need a good cleaning

And your base idle may be out of whack too. There's a big list of things to do before messing with the base idle so get a hold of the manual.
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Old December 17th, 2014, 11:15 AM
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Peter
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Quote:
Originally Posted by Red90 View Post
It can be a lot of things. You need to get the manual and go through the troubleshooting procedure.
Very true...Here's a good thread on TPS issues
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  #6  
Old December 17th, 2014, 11:20 AM
corrumpu
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chris b
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I have rave and will go down that road. I saw the TPS thread, which is where my rovergauge question was from.

Thanks for the input.

--chris
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  #7  
Old December 17th, 2014, 11:22 AM
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Bill Adams
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Stepper motor really only comes into play on deceleration. It opens to add air to the mixture when your throttle plate is closed so that the engine won't pass out. Once it goes to idle the stepper motor closes the bypass air and doesn't open again until you decelerate, so coming off idle it won't be doing anything.
What you may want to look at is the vacuum advance on the distributor. Opening the throttle should give a whoosh of vacuum to advance the distributor plate. If the hose from the plenum to the diz is bad it may not be advancing properly.
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  #8  
Old December 17th, 2014, 11:24 AM
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TPS, Stepper, VSS, injectors, CLT, O2.... Lots of things can can idle issues. Just run individual tests and see if you can find one item not working properly. It does not take much time and you will learn a lot about the system in the process.
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  #9  
Old December 20th, 2014, 06:29 PM
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Obligitory random guess......



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