3.5 won't rev under load - Defender Source
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  #1  
Old June 1st, 2014, 12:36 PM
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3.5 won't rev under load

All:

Idles fine, revs to redline without issues under zero load, but when driving it revs fine to 1/4 throttle, then acts like it's fuel starving something shocking. It helps a bit if I pull the choke out, but even when she's up to operating temperature, it won't rev worth a crap (revs increase but not correctly, sounds like it's missing).

Any ideas?

Thanks,

Paul.
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  #2  
Old June 1st, 2014, 01:12 PM
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Blown diaphragm in one of the carbs ? Fuel filter issue ?
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  #3  
Old June 1st, 2014, 01:22 PM
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Thanks guys!

Fuel filter was just replaced. Will check the vacuum lines, and the vacuum advance and advance weights on the distributor and the carb diaphragms.

Plan to swap the 3.5 for a 4.2 as soon as funds allow...
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Current fleet: '85 Ninety 3.9 V8i Auto SW, two Discovery 1's (one for my Nephew, one for my Niece),'07 BMW 335Xi.
Past Land Rovers: '96 Discovery SD, '00 Range Rover HSE, '04 Discovery SE7, '07 Range Rover HSE, '08 LR3 SE7.
Past fleet: '89 Classic Mini, '83 Porsche 911 SC Coupe, '89 911 Carrera targa, '96 911 Carrera 4, '07 Toyota FJ Cruiser, several Minis.
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  #4  
Old June 1st, 2014, 01:27 PM
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What changes since it last ran right?
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Old June 1st, 2014, 02:06 PM
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Quote:
Originally Posted by JSBriggs View Post
If you are looking to put a 4.2 in, what fuel system are you planning on running? If you are considering an Edelbrock you might try it out on the 3.5 first.

-Jeff
Fuel injected 4.2. Likely stock f.i. system unless there's something better? I considered putting a single carb on the 3.5 but was advised that it wouldn't add much power. I need more power.

Quote:
Originally Posted by Rocky View Post
What changes since it last ran right?
Good question. Basically, it sat overnight after a road trip (260 miles) during which it ran great. It didn't want to start the next morning, and had a really bad gas smell. Hasn't run worth beans since.
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Current fleet: '85 Ninety 3.9 V8i Auto SW, two Discovery 1's (one for my Nephew, one for my Niece),'07 BMW 335Xi.
Past Land Rovers: '96 Discovery SD, '00 Range Rover HSE, '04 Discovery SE7, '07 Range Rover HSE, '08 LR3 SE7.
Past fleet: '89 Classic Mini, '83 Porsche 911 SC Coupe, '89 911 Carrera targa, '96 911 Carrera 4, '07 Toyota FJ Cruiser, several Minis.
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  #6  
Old June 2nd, 2014, 06:48 PM
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Update:

Drove it 1/2 mile to the gas station yesterday, ran like crap all the way there & back.

Fired it up this morning- ran great! Took her a couple of miles along the freeway & back on the secondaries- no problems at all.

Will let you know if it happens again.

Thanks,

Paul.
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Current fleet: '85 Ninety 3.9 V8i Auto SW, two Discovery 1's (one for my Nephew, one for my Niece),'07 BMW 335Xi.
Past Land Rovers: '96 Discovery SD, '00 Range Rover HSE, '04 Discovery SE7, '07 Range Rover HSE, '08 LR3 SE7.
Past fleet: '89 Classic Mini, '83 Porsche 911 SC Coupe, '89 911 Carrera targa, '96 911 Carrera 4, '07 Toyota FJ Cruiser, several Minis.
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  #7  
Old June 2nd, 2014, 08:01 PM
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Quote:
Originally Posted by JSBriggs View Post
Secondaries? What carb/manifold are you running?

-Jeff
Stock, whatever that is. I think they are SU.
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Current fleet: '85 Ninety 3.9 V8i Auto SW, two Discovery 1's (one for my Nephew, one for my Niece),'07 BMW 335Xi.
Past Land Rovers: '96 Discovery SD, '00 Range Rover HSE, '04 Discovery SE7, '07 Range Rover HSE, '08 LR3 SE7.
Past fleet: '89 Classic Mini, '83 Porsche 911 SC Coupe, '89 911 Carrera targa, '96 911 Carrera 4, '07 Toyota FJ Cruiser, several Minis.
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  #8  
Old June 3rd, 2014, 12:10 PM
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Quote:
Originally Posted by JSBriggs View Post
I was confused (dual side drafts don't have secondaries) You might double check the oil level in the carbs as well. -Jeff
pretty sure he means secondary roads.
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Old June 3rd, 2014, 12:28 PM
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I think they are probably strohmburgs. That is what my 3.5 had.
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Old June 3rd, 2014, 02:53 PM
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Could it have been bad gas? It has happened...albeit rare. If the only change was the gas, then my guess would be carb related or bad gas, possibly water or sediment contamination. I know that I had an idle jet loosen on my motorcycle once and giving it gas flooded those cylinders and it wouldn't run well but idled just fine. I am not familiar with your carbs, but similar condition. Since it runs fine now, without further change, gas contamination/clog of some sort seems likely. A vacuum leak would be next on my list and if it is a cracked line, that can seem to be intermittent...
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