2.5 NA diesel symptoms of a bad injector pump - Defender Source
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  #1  
Old February 8th, 2015, 02:38 PM
Ruedelesseps
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Jon Atkinson
1985 110 MOD Pickup
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2.5 NA diesel symptoms of a bad injector pump

Have a 1985 110 with a 2.5 NA diesel. I believe the injector pump is bad, but am looking to confirm or for other theories.

Truck starts fine, with some white smoke upon start. This goes away when the engine reaches temp. I have recently replaced the filter and fuel pump. Truck has recently developed a worsening wild idle condition, where the truck goes full throttle uncontrollably when not under load. This started as a minor increase in rpm after highway driving and has worsened to the full throttle issue that starts at idle right after starting. It also s ems to push the vehicle in gear. Turning the key off stops this and it will spin down.

Any thoughts would be much appreciated.
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  #2  
Old February 8th, 2015, 02:53 PM
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PM sent. Can't tell how to advise by your write up.
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Old February 8th, 2015, 03:37 PM
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Are you sure the throttle cable is not sticking?
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  #4  
Old February 8th, 2015, 03:53 PM
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gene
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Could be a couple of things, check that your air filter is not saturated with oil from the breather system. It can cause a runaway motor even with the key off.

Check that your idle screw is tight and not moving in and out.

On the bottom of the injector pump is either a bolt or a diaphram, the diaphram helps with starting and maybe has failed (dripping fuel?).

Pics are of diaphram and its location and the bolt.

HTH
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  #5  
Old February 8th, 2015, 08:32 PM
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When the engine goes to over rev can you use the key to turn it off?
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  #6  
Old February 11th, 2015, 03:41 PM
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Hi

As stated above...

Standard fault in an older LR...diaphragm is what I'd be looking at to replace..easily done and off you go. Last one I priced for my buddy for his old Td here was about £30. That common you should be able to find a photo/written article on how to replace it.

Try a net search on same and you'll find it without a problem.

All the best.





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  #7  
Old March 24th, 2016, 02:01 PM
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Jon Atkinson
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Hey All,

A belated thanks for the replies here! I had seen a couple of replies via some sort of push notifications on my phone, but didn't realize there were so many posts here. I am still learning how the forum mechanics work.

Unfortunately, I am returning because this problem has reoccurred. Back when I initially posted, I was able to get the truck to my mechanic, who fiddled with the injector and the problem basically went away. He is not a diesel or land rover specialists and couldn't really tell me what he did. He approached it as a "tuning" service and adjusted the idle stops and I believe rotated the injector pump forward to improve timing. By the time he was done with that and got it started again, the problem had gone away. He did note some minor fuel leakage coming from the injector and recommended replacing the injector. I took the truck back and started looking for a replacement injector, but wasn't able to source one, meanwhile everything was working, so I sort of just kept driving and forgot about it.

The problem restarted about a week ago and is now occurring pretty consistently. The engine starts runs normally for about a minute and then starts randomly spiking to almost full RPM without any input on the throttle.

I am concerned that I am burning oil and could have something serious like a head gasket failure. I am seeing some oil leakage pushing out on the side of the block.

Is there a way to isolate whether this is an injector problem or something in the engine?

I am going to check the solution Ignotus suggests above, but would appreciate any other thoughts or suggestions.

------ Follow up post added March 24th, 2016 01:07 PM ------

Quote:
Originally Posted by Capt Milks View Post
When the engine goes to over rev can you use the key to turn it off?
Yes, you can use the key to cut it off. It takes a second to spin down, but it does cut off.
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  #8  
Old March 24th, 2016, 02:47 PM
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Robert Davis
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Jon:
You need to do 1 of 3 things:
Get hold of a factory service manual and tools, then figure out what the issue is...
OR
Take the vehicle to someone who knows what they are doing regarding this engine and the problem
OR
Install a different engine with performance that can actually get out of it's own way and run down the road at reasonable speeds.

There is little anyone will be able to do to assist you because I believe you are actually not describing the issue accurately or with enough detail.

Google Blue Ridge Diesel in VA as they can rebuild your injectors and install new nozzles.

Please don't take this message as disrespectful because it is not meant to be... everyone has to start somewhere.
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Uncle "Richard" Douglas has a Land Rover with big wheels that never gets stuck... until he breaks something so it won't go. Uncle Douglas always breaks something. - Anna Crowther at the Conclave 2012 (AKA Carburetor Neck)

"What's with this death wobble, Uncle Douglas, I can't keep it in 1 lane?"
UD: "Just Power through it man!"
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  #9  
Old March 24th, 2016, 03:17 PM
Ruedelesseps
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Jon Atkinson
1985 110 MOD Pickup
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Thanks for the reply! I have no problem admitting that I am extremely green. Learning the language is a big part of my problem.

Unfortunately, I haven't found a good local mechanic that really understands these engines.

I do have service manuals but have a hard time knowing where to start with diagnosis.

The problem appears to be related to the bolt on the underside of the injector suggested by Ignotus. I located it and tightened it down and was able to get the engine to run normally for several minutes after which the engine started idling up, but not as dramatically as before. I turned the engine off, retighten the bolt which appeared to have loosened and repeated with the same result. I did this 3 times.

I believe I need to replace that bolt (It does not have the diaphragm). Does anyone know the name, part number or a source?

Thanks.
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