'94 D-90 lurching at 3000 rpm - Defender Source
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  #1  
Old November 5th, 2012, 10:13 PM
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Terry L. Pierce
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'94 D-90 lurching at 3000 rpm

My '94 d-90 will frequently begin lurching when i reach about 3000 rpm in 2d and 3d (maybe any gear). The tach does not drop when this happens, nor do I lose power. I always back off of the accelerator before it gets real bad. Fuel pump and filter nearly new. New plugs. If anybody has experienced this, I would appreciate hearing about a fix.
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  #2  
Old November 5th, 2012, 10:26 PM
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Get a new alternator..

Ask me how I know...
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  #3  
Old November 5th, 2012, 10:30 PM
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Eric Doxey
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I just recently had the same thing start to happen at about 3k rpm's
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  #4  
Old November 5th, 2012, 10:40 PM
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Yea... This 2,800 to 3,000 rpm stumble issue is commonly related to a bad diode in the alternator. I am 99% sure this is the cause. Replace the alternator and problem is fixed.
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  #5  
Old November 7th, 2012, 12:46 PM
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For those who replaced their dizzys, what did you go with? I think I need to replace mine plus coil. I had the bucking issue as well and found that I could corret it by retarding the timing but it make the engine perform more sluggish. Also, did anyone have to adjust their stepper motor when changing the dizzy?

Thanks

Matt
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  #6  
Old November 7th, 2012, 12:54 PM
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Russell
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Quote:
Originally Posted by flananuts View Post
For those who replaced their dizzys, what did you go with? I think I need to replace mine plus coil. I had the bucking issue as well and found that I could corret it by retarding the timing but it make the engine perform more sluggish. Also, did anyone have to adjust their stepper motor when changing the dizzy?

Thanks

Matt
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  #7  
Old November 7th, 2012, 02:07 PM
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Brian Jones
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Mine did the same on long trips. I only noticed it when i was running both the wipers and the headlamps. New alt. cured it.
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  #8  
Old November 7th, 2012, 08:31 PM
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Paul / Boultbee
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What about bucking in first gear? I have that issue - either have to rev the engine or find a sweet spot and shift to 2nd. I notice it more in the mornings (cooler temp) than any other time. Pretty sure it is not the tanny...

Sorry for the hi-jack but sounds like Terry is "fixed". I mean your problem that is.
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  #9  
Old November 7th, 2012, 09:02 PM
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barry f
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Quote:
Originally Posted by paulb
What about bucking in first gear? I have that issue - either have to rev the engine or find a sweet spot and shift to 2nd. I notice it more in the mornings (cooler temp) than any other time. Pretty sure it is not the tanny...

Sorry for the hi-jack but sounds like Terry is "fixed". I mean your problem that is.
Does it buck in reverse? Sounds like clutch slippage.
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  #10  
Old November 15th, 2012, 08:29 PM
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Terry L. Pierce
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Wow Chris. Thanks a million. I had my sons take my d-90 to my experienced rover mechanic (Mickey Weatherly - Norman, OK) with the print-out of this thread. He had my alternator rebuilt (which obviously takes care of the bad diode problem). Got it back yesterday and haven't had a problem since. Can't say thanks enough for solving this nagging and mysterious problem.
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  #11  
Old November 15th, 2012, 08:39 PM
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Great to hear it all worked out well.
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  #12  
Old November 15th, 2012, 08:40 PM
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Joshua
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I wonder how he had it rebuilt. All of the alternator places I had called to rebuild mine confirmed that the parts to rebuild the original magneti marelli were no longer available.

What'd it set you back for the rebuild?
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  #13  
Old November 15th, 2012, 08:47 PM
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Terry L. Pierce
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rebuild done by a guy that Mickey said had been doing it for 50 years. $250 for the rebuild, $105 labor. All total about $379 including tax and piddly stuff. I can't guarantee that magneto marelli still lives in my engine compartment, but the alternator works now.

------ Follow up post added November 15th, 2012 07:50 PM ------

I'll also say that this is proof that everyone can learn something new every day.
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  #14  
Old November 17th, 2012, 06:57 PM
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Eric Doxey
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Anyone have recommendations for an up rated alternator? Is there something better while I am replacing it
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  #15  
Old November 18th, 2012, 05:22 AM
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Joshua
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Search action alternator here. I think mine is 120 amp. I posted a bunch of info on them.
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