High rpm miss when hot - Defender Source
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  #1  
Old May 4th, 2006, 05:50 PM
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High rpm miss when hot

When hot the motor has a high (starting at 3700-4000rpm) miss.

Thoughts?

Cats?

Ignition module?

Timing/bad dizzy

Also does not have as much power as my previous D90.
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  #2  
Old May 4th, 2006, 08:34 PM
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Mike
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I posted this question last year and never really got a good answer. The most common response was, " Its your governor". Not sure how true this is.
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Old May 4th, 2006, 08:50 PM
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Could be a few things that I can think of.

Worn plug wires, cap, rotor.
Dirty plugs.
partially clogged fuel filter.
low fuel pressure
clogged fuel injectors.

-Hans
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  #4  
Old May 4th, 2006, 09:59 PM
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I would start by checking the vacuum advance of your distributor. Then, if still persisting, I would swap the rotor and cap and see if it persists. Do you have access to another ignition module to rule that out? I would say check your plugs, but high rpm missing seldom shows up in my experience as a visual sign. If the dizzy checks out, my guess is fuel pressure/fuel starvation. Change the $8 filter. Hell, change it anyways--talk about an easy piece of maintenance. Still persisting? Hmmmm...it is possible that it could be sticking valves or worn cam...maybe. I would think possibly a clogged fuel injector is up there as well. Start simple. Also, since it is heat dependant, think about what expands or degrades with heat to help solve this one...thinking of that, make sure the fuel is staying cool...
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Old May 4th, 2006, 10:06 PM
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I had a miss like that and it was an aftermarket wire that had chafed. Take a look.
Brian Bertolini
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  #6  
Old May 4th, 2006, 10:42 PM
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Maybe the ignition coil breaking down when hot.
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  #7  
Old May 5th, 2006, 12:46 AM
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Chris Davis
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I have to say, if you like solving logic problems, owning a rover should be a the top over your list...
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  #8  
Old May 5th, 2006, 07:56 AM
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It's probably just vapor lock in the gas tank, try putting a heat shield on the exhaust
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  #9  
Old May 5th, 2006, 06:28 PM
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Mike as scary as this is I think I noticed an exhaust leak.

Cap, wires and rotor are all new.

Will throw on a fuel filter, actually I might pay someone to do that for me. I can swap coils with the lwb and see if that works too.

Ron
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  #10  
Old November 15th, 2011, 12:00 PM
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Now my LWB is doing this. Any ideas? Pulls great under 3500 or so and then basically can't get past 4500.
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  #11  
Old November 15th, 2011, 12:33 PM
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On an EFI i would suspect the dizzy mounted module 1st then fuel pump or wonky injector, on a carb i'd go for coil or condensor.


have fun

Gren
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