OK, Yet another Intermittent Dying-at-the-Light Thread - Defender Source
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  #1  
Old May 23rd, 2014, 05:52 PM
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OK, Yet another Intermittent Dying-at-the-Light Thread

Iíve had a coupla two or three died-at-the-stop-light events here on my stock 94 d90 3.9L in the last thousand or so miles, re-starts just fine & runs normally. Then this morning did it again at a light, re-started right away, ran a bit rough this time but by the time I was ready to pull into a parking lot to head home, smoothed out & ran fine the 30-40 miles to work. Iíve been reading about this symptom at the various other similar threads & seems a lotta people throw a lotta parts & labor at it & seems a common fix is the fuel relays and or the ECU.
Am I right here?
I'm gonna try & get the codes read this weekend after that where should I start, the ECU? Rather than replace the ECU , can it be re-set by disconnecting the battery?
Mr. Feder, you ask a lotta questions.
Oh, BTW posted this on the Houston LR Club and someone else, 97 d90, is starting to have same problem.
Thanx ahead guys & have a good Memorial Day Weekend & especially thanx to all of y'all Vets.
Danny
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  #2  
Old May 23rd, 2014, 06:08 PM
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Idle control valve
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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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Old May 23rd, 2014, 06:32 PM
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stepper motor is the idle control valve, Right?
Spray clean it up? One of the Easier initial steps?
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Old May 23rd, 2014, 06:39 PM
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Quote:
Originally Posted by UTRPh View Post
stepper motor is the idle control valve, Right?
Spray clean it up? One of the Easier initial steps?
Go to autozone and buy part AC102. If they ask what it's for say a 1988 6 cyl Chevy Astro Van because it doesn't cross reference to a defender.

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Old May 23rd, 2014, 06:48 PM
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Can the ECU be re-set or does it just keep the same codes.
And yea, if the stepper, aka idle control valve is the problem same codes should come right back confirming the stepper?
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Old May 23rd, 2014, 11:05 PM
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Quote:
Originally Posted by UTRPh View Post
Can the ECU be re-set or does it just keep the same codes.
And yea, if the stepper, aka idle control valve is the problem same codes should come right back confirming the stepper?
ecu can be reset ... basically by removing power from the vehicle. I doubt it would throw a code for what you are describing. Frankly a desktop calculator has more compute power and intelligence.

But what you are describing is commonly solved as described ... unless you have a load of other symptoms you haven't mentioned.
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Old May 23rd, 2014, 11:57 PM
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Thanx guys. I'll take it tmrow to see what codes there are, then remove power depending on what I find out from the codes
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Old May 24th, 2014, 12:07 AM
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Thanx guys. I'll take it tmrow to see what codes there are, then remove power depending on what I find out from the codes
You don't need to take a 94 anywhere to see what the codes are...It's a small black box about the size of a cigarette pack that shows you a red LED number/s.
There's only 23 different fault numbers.
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  #9  
Old May 24th, 2014, 12:46 AM
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Even better. Jason, no other symptoms that I can tell. Runs smooth, idles smooth except for when it dies & even then no rough idling, coughing, sputtering when that does happen other than this mornings new occurrence & that's been almost a hundred miles ago.
The ecu, is it located on the passenger side footwell near the door?
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Old May 24th, 2014, 06:24 AM
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Here's a nice one page rundown...

http://www.pangaea-expeditions.com/r...des/index.html


.
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  #11  
Old May 26th, 2014, 03:44 PM
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Thanx for the info Jason, Jeff. Found the Range Rover On Board Diagnostic Display, prc 7067 turned ignition on no led's lit up anywhere. Is it on the same side as the stickers, on the narrow top somewhere or do I just not have any codes poppin up?
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Old May 26th, 2014, 06:39 PM
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Originally Posted by UTRPh View Post
Thanx for the info Jason, Jeff. Found the Range Rover On Board Diagnostic Display, prc 7067 turned ignition on no led's lit up anywhere. Is it on the same side as the stickers, on the narrow top somewhere or do I just not have any codes poppin up?
On the side

You should get. 02 if you disconnect the battery.

Don't expect it to provide anything useful, it has very limited fault codes.
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Old May 26th, 2014, 07:06 PM
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thanx. give it a shot in a bit. sky's are opening up here in Houston right now
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Old May 26th, 2014, 07:52 PM
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This sounds like textbook ignition amplifier failure (If there were such a thing). The IAC is easier to replace, so certainly go ahead and give that a shot first, but I'd put money on your ignition amplifier being toast.

They make the truck behave very strangely sometimes.
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Old May 29th, 2014, 10:57 AM
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Sorry for the delayed response, cats n dogs've falling from the sky here last few days & since d90's tend to leak a little, I've been driving something less prone to over-humidifying whilst I drive.
Did spray the connections to the stepper to see if that'll make a difference but haven't driven it yet.
Autozone carries the part # ac102, limited lifetime warranty for 51.99 & will swing by & give it a try after seeing what the spray does, if anything.
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  #16  
Old June 8th, 2014, 09:58 AM
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Update Bump

Ok, finally drove in hot dry Houston weather. Contact cleaner seemed to make a difference for about 3-400 miles then it started again with the intermittent dying at idle thing. Where & how do you check for the ignition amplifier to see if it has failed or does this now sound like idler control valve? Thanx ahead
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Old June 8th, 2014, 10:12 AM
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Quote:
Originally Posted by UTRPh View Post
Ok, finally drove in hot dry Houston weather. Contact cleaner seemed to make a difference for about 3-400 miles then it started again with the intermittent dying at idle thing. Where & how do you check for the ignition amplifier to see if it has failed or does this now sound like idler control valve? Thanx ahead
Dying at the light sounds very much like idle control valve or possible broken VSS. I'd start with cleaning the idle valve.
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Old June 8th, 2014, 10:21 AM
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I find this page to be very helpful when looking at issues on a 14CUX truck since a lot of the stuff is the same as a Range Rover Classic.
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Old June 8th, 2014, 11:04 AM
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OK, next step

Clean the idle control valve. I guess just plane ol carb cleaner will suffice, re-clean the electrical connector contacts & see how it behaves.
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Old June 8th, 2014, 11:57 AM
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You may also want to clean the housing the ICV mounts into. Check all electrical connections from the dizzy to the coil/ign module.

Best of luck,

Cheers...
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