HELP! Hunting Idle, can't figure it out - Defender Source
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  #1  
Old August 15th, 2006, 08:57 PM
btate
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Bryan Tate
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HELP! Hunting Idle, can't figure it out

Ok, 94 d90.
I have replaced about everything I can think of.....
Fuel pump, fuel filter,fuel pressure regulator.
Mallory distributor and mallory coil, wires and plugs
Stepper motor, TPS, fuel injection flush, O2 sensors,fuel temp sensor

I did disconnect the computer today, but once it gets hot the idle starts to dance between 500-1200 RPM
At least now it doesn't choke off!

I guess it could be the ECU or vacuum leak?
What else????
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  #2  
Old August 15th, 2006, 09:21 PM
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Thomas
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You might have to replace your ECU, B. Find someone with a D-90 and borrow his for a while. I don't think it matters what year.
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Old August 15th, 2006, 10:09 PM
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Tony Brooks
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Changed the ignition contole module to the remote setup?
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  #4  
Old August 15th, 2006, 11:01 PM
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Chris Davis
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WARNING--I MIGHT RAMBLE. IPA DOES THAT SOMETIMES. I grabbed a cold one to hopefully keep this situation in check. ;-) Check the circled attached hose and it's components for cracks or clogs. It is a sneaky bastard according to some. Next, it sounds like it could be EGR related since that is a warm engine condition. Check that canister coming off the passenger front valve cover--that grey thing. There is a screen inside that can be unrolled and cleaned. I use parts cleaner--be careful because either carb/choke cleaner or brake cleaner I heard can disolve it--I never use either since my memory sucks and I can't remember which one not to use. The Exhaust Gas Recyling system is supposed to work when warm, but not before, which may possibly expain the condition only when warm. Check all the hoses related to this system. Maybe the gas tank recycling canisters that go to the engine bay and that magic filter under the rear tire wheel (passengers side) I don't know what they may do, but if it is for venting, they may be clogged. Matter of fact, check your gas cap and make sure it is venting properly--since it is a warm occurance, maybe a vacuum is occuring in your gas tank? I have heard that some people's friend's sister's cousins have been known to spray carb cleaner around the gaskets and hoses in the engine bay to find suspected leaks by listening for idles getting faster. Whether you follow that train of thought is your and your's alone decision, and certainly a particularly bad choice if you think the exhaust manifolds or coil might be a source of the leak. One should never, ever spray flamable fluid on flamable surfaces. If one is nervous about the entire possibility of an explosion somehow, then don't do it.

Warned you I'd ramble...and paranoid of lawyers... (and layers)
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  #5  
Old August 16th, 2006, 02:14 AM
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Check all vaccum /plenum related hoses, breathers, sensors, ignition module.
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  #6  
Old August 16th, 2006, 06:56 AM
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Bryan Tate
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The ignition module went to the dump, it was replaced when I did the Mallory (has a built in module)
I have tried spraying carb cleaner, but no luck yet. I have inspected hoses and the EGR can and they seem ok.
I will try the Ecu tonight if I can. Keep thinking guys!!
Bryan
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  #7  
Old August 16th, 2006, 12:44 PM
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Here
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you can borrow my ecu, come on by and grab it.
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  #8  
Old August 16th, 2006, 11:42 PM
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The ECU will have a hunting idle for a few days minimum after you disconnect it. The more you drive it around, the faster it will re-learn the idle characteristics. It will be most noticeable when coming to a stop, and it will stay high for a bit before coming back down. Give it a bit of time to see if the ECU adjusts itself and the idle settles down. Last time I disconnected my computer it took over a week.

-Hans
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  #9  
Old August 17th, 2006, 01:59 PM
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Bryan Tate
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Thats good to hear.....I figured it would need some time, but wasn't sure how long.


Thanks
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  #10  
Old September 12th, 2006, 05:25 PM
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Bryan Tate
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Ok,
I wanted to conclude this thread for future generations of d-90's with problems
(I hate reading old thread where you don't know the resolution to the problem)
I replaced about everything on the truck. It turned out to be the MAF
Picked up a used on and had Land Rover Cape Fear put it on and dial things in.
Runs like new! Idles perfect!
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