93 NAS 110 cuts out when put into gear - Defender Source
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  #1  
Old April 2nd, 2014, 08:39 PM
l*factor
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Daniel
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93 NAS 110 cuts out when put into gear

Thanks in advance for any insight that is offered. It started a couple weeks ago when I was going down the road and the truck quit. I was low on gas and thought maybe I had run out so I added some but it still acted like it was not getting fuel. Took it to the shop and they did the idle control valve then The fuel pump. Truck runs now but cuts out intermittently when put into gear - particularly reverse. The check engine light is on and code is for the air mass. But I was curious if this is something anyone has heard of or had any ideas. Thanks again
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  #2  
Old April 2nd, 2014, 08:52 PM
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that's pretty bizarre for a manual transmission. the stepper valve controls idle. my best guess is you have a vacuum leak somewhere along the intake system.
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Old April 2nd, 2014, 09:26 PM
l*factor
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Thanks, that's a good thought. I will have them explore that
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  #4  
Old April 2nd, 2014, 10:06 PM
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chris
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check the inlet tube for cracks , i second the intake leak
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Old April 3rd, 2014, 09:00 AM
l*factor
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Appreciate it. Will look into that today
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  #6  
Old April 3rd, 2014, 09:04 AM
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any chance you have access to another air flow meter/mass air sensor ? If thats the code its throwing...
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Old April 3rd, 2014, 09:10 AM
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Yes, I believe they are installing it today
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  #8  
Old April 4th, 2014, 09:36 AM
l*factor
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No issues with intake system. They put on the new air mass, problem still occurs + it still throws off the code.
Frustrating.
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Old April 4th, 2014, 10:54 AM
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Tps been looked @ tested ?
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  #10  
Old April 4th, 2014, 11:03 AM
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Any work done prior to this event. Recheck.
If using a K&N throw it away. Check MAF wiring for continuity breaks or damage. Pray its not the ECU gone bad.
And of course since its electricity, check the alternator and battery. These Rovers get so cranky if volts are not nice to them.
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  #11  
Old April 4th, 2014, 01:57 PM
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Will look in to what you all mentioned.

Two ancillary issues which happened at the same time I thought I would mention: the clutch pedal seems to have given way such that the clutch doesn't engage until the pedal is near the floor. Secondly, the fuel gauge reads when you click the key to on, but when you turn the key to start the gauge goes off. All this happened at the same time.
It is still acting like its not getting fuel.
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  #12  
Old April 4th, 2014, 02:10 PM
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I'm going with a faulty chassis harness. It's a left field guess but your fuel gauge sender, fuel pump, and reverse lamp are all wired into that harness.
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Old April 4th, 2014, 02:38 PM
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ditto. stat by checking your grounds. all your relays and gauges use common ground and it has to be good.
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Old April 4th, 2014, 02:50 PM
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The gauge going dead when the key is turned sounds like a bad ground
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  #15  
Old April 14th, 2014, 05:30 PM
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Tried a new air mass - problem persisted

Tried a new ECU - problem persisted

Jeez, you guys. 5 weeks and counting.

It's really not wanting to idle at all.
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  #16  
Old April 14th, 2014, 11:36 PM
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Daniel,

Ditto to the forum comments above regarding the fuel gauge and grounding problems. I had the EXACT same issue with my fuel gauge reading correctly when the key was turned. It would read 1/3 less than when the truck was running. Additionally I had turn signal and brake light issues at the same time.

All these things are on the same harnesses at the back of the truck. See the 110 Repair manual for pictures and schematics. The fuel pump is also on the same harness as the fuel gauge wiring.

All went away when I removed the rear speakers to get at the common grounds on each side of the truck.
In each case, I unbolted the nut and bolt that pin the common ground terminal to the body, threw them away, seriously wire brushed each ground terminal on both sides, wire brushed the aluminum body under the lugs and installed new 5 mm screws and nuts.

This corrected the fuel gauge reading, turn signal intermittent failures and other weird electrical things at the back of the truck.

Give it a try.

------ Follow up post added April 14th, 2014 08:39 PM ------

Correction: I wrote "It would read 1/3 less than when the truck was running."
It really should read: "When the engine was started the gauge dropped and read 1/3 less than was really in the tank. Turn the engine off and it would return to reading correctly."
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  #17  
Old April 15th, 2014, 12:11 AM
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Yes, grounds behind the speakers in the back.
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  #18  
Old April 15th, 2014, 12:43 AM
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If cleaning up your grounds doesn't fix it, check your harness. A PowerProbe will be useful for detecting shorts in your chassis harness. Other option--if there is an intermittent problem back there--is to jiggle the chassis harness where it exits the frame at the rear of the truck. If something suddenly starts or stops working when you do this, you've found your problem. I don't know if there are new NAS 110 harnesses available. When my harness went bad in my 94 NAS D90, I pulled it and sent it to British Wiring, who sent it over to the UK to be remade. Three weeks later, I had a brand new harness in hand and it cured all of my problems.
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  #19  
Old June 11th, 2014, 06:38 PM
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Just a follow up...
After much hand wringing and deliberation about the source of the issue and after we had ruled out or replaced many of the suspects
We replaced the ignition and that seemed to do the trick

Thanks to everyone's for the advice/suggestions
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