Intermittent Stalling. - Defender Source
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  #1  
Old May 4th, 2011, 10:32 AM
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Josh
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Intermittent Stalling.

Weird thing has started to happen. When the rover gets warmed up it will stall at stop lights, not every time but about 30% of the time. It starts right back up.

Any thoughts? I haven't noticed any other problems.

Thanks!
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  #2  
Old May 4th, 2011, 10:34 AM
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Is your oil light popping on?
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  #3  
Old May 4th, 2011, 10:39 AM
bcstanle
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Brandon Stanley
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Mine did something like that when I'd go on just short trips for a couple weeks without a long one in between.
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  #4  
Old May 4th, 2011, 10:47 AM
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Mike
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Check the idle control valve (stepper motor).
Mine did this. I cleaned it, and it would eventually happen again.
I replaced it, problem solved.

Good luck...

Cheers...
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  #5  
Old May 4th, 2011, 11:58 AM
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Jake K.
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The EFI coolant temp sensor can cause similar symptoms when it's warmed up. Check the plug and make sure it's not broken or loose.
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  #6  
Old May 4th, 2011, 01:32 PM
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Craig Dickson
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Also check and clean connections to the wires on the bottom of the ignition coil.
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  #7  
Old May 4th, 2011, 04:44 PM
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Josh
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No oil light.

The check engine light came on for a bit, but now is off again.

I'll check everything you listed, and report back.

Thank you.
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  #8  
Old May 4th, 2011, 04:54 PM
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mark kellgren
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Also, if you take off the duct to the MAF going into the intake throttle body, then looking straight into the metal throttle body you will see the throttle plate that rotates AND on the bulkhead side, you'll see a little port hole about pencil size. That's path allows air to bypass the throttle plate at idle no matter what. That can get clogged up with gunk. When I had my D1, I would take carb cleaner with the long straw, stick it in there and spray until the splashback fluid would come out clear instead of dark brown.

That and/or the stepper are likely your problems. ECU controls the stepper, which controls your idle.
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  #9  
Old May 4th, 2011, 09:00 PM
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Daniel Hayes
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Are you getting any codes? Another possibility is the road sensor or speed sensor. The speedo cable connects to it right before the transfer case.
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There are no guarantees expressed or implied of the accuracy or correctness of the contents of this message, and the Author is not liable for the taking of any action in reliance upon the contents of this message. As always, do your own research. To the extent that opinions are expressed in this message, they are not necessarily the opinions of the Author.
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  #10  
Old October 5th, 2011, 12:21 PM
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Josh
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Just following up on this.

The stalling cut down to 10-15%. I just dealt with it. I never got any codes. BUT when I pulled my speedo cable to have a new one made I no longer get ANY stalling!

So it was the speedo calbe being brokien causing the problem?

Weird!
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  #11  
Old October 5th, 2011, 04:56 PM
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Speed transducer...

http://www.roversnorth.com/store/p-1...der-90110.aspx
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  #12  
Old October 5th, 2011, 06:09 PM
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Thank you.

I'll check it out once I get my speedo cable back in.

Thank you,

Josh
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  #13  
Old October 27th, 2011, 09:44 PM
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i had similar symptoms and it turned out to be an old vacuum hose between the intake and fuel regulator. the rubber had expanded it was pretty loosely connected on one end. lamorna in seattle fixed this today for me and reset the base idle, so far so good.
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  #14  
Old October 28th, 2011, 10:37 AM
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Quote:
Originally Posted by Weldon View Post
Whats the difference between that transducer and this one?

http://www.roversnorth.com/store/p-2...cle-speed.aspx
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  #15  
Old October 28th, 2011, 11:00 AM
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Quote:
Originally Posted by Quimbola View Post
Whats the difference between that transducer and this one?

http://www.roversnorth.com/store/p-2...cle-speed.aspx
The one you posted converts from a lower speedo cable attached to the transfer case to an upper speedo cable. Not sure why Land Rover used this method on NAS trucks, it seems like a really complicated and expensive way to do something very simple. Eventually Land Rover wised up and used a hall effect sender only.

The YBE100530 is a hall effect sender only with no upper speedo cable. It is designed for electronic-only speedometers and installs directly to the transfer case.

Land Rover then replaced the YBE100530 with the YBE100540 which is basically just another hall effect sender. The main difference is that the ***540 unit is a cheezy plastic piece of crap while the ***530 unit is better built unit. It saved Land Rover some money, but the difference in build quality is substantial.

I replaced my old school mechanical speedo cable with the YBE100540 unit, it's yet to be seen if the cheezy plasticness of the sender is a liability.
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  #16  
Old October 28th, 2011, 03:52 PM
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Thanks!

Thank you for the clarification!
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  #17  
Old November 9th, 2011, 09:07 PM
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Rick Mabus
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Can someone give me an idea where the stepper motor is?
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  #18  
Old November 10th, 2011, 11:06 AM
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Also Overlander, you mentioned a couple of things that sound extremely helpful, and fairly easy to try and fix for us DIY guys. Any chance however you can try and give us a better indicator where the throttle body is inside the hood. I am all the sudden getting some of this stall of which you all speak. Also any help located the "stepper" would be greatly appreciated.
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  #19  
Old November 10th, 2011, 11:18 AM
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mark kellgren
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let me find a graphic to reference.

update:

picture attached of removed throttle body. look inside and you'll see the hole on the inner wall with a hose coming out the outer side. that let's a small amount of air bypass a closed throttleplate so the engine will keep running if the stepper can't keep the throttleplate open itself(because it failed).

Also attached pic of stepper motor location from landroveronly.com. stepper motor (aka idler valve) is clearly marked with arrow. you can find an equivalent part for a corvette. don't remember number but it's a common sourced part at any autostore. disconnect 2 wire connector, unscrew it and install new one with new o-ring.
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  #20  
Old November 10th, 2011, 12:00 PM
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Overlander. You are officially the man. Thanks a million and I will update as to how this takes my issues away.

Enclosed are pics for anyone else who is like me (not the sharpest stick in the pile). Am I right?

Fuel Throttle body assembled. Take the hose off the right side (drivers) and find the small hole of which you speak.


Stepper motor with throttle body in the background.


By the way. Do I have to upgrade something to be able to post pics right to this thread?
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