3.5, dual carbs, original exhaust = no registration - Defender Source
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  #1  
Old August 17th, 2014, 07:43 PM
RBBailey
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3.5, dual carbs, original exhaust = no registration

OK, I have this stock engine and I need to get it past the Oregon DEQ test. It is a long way off... I put K&N filters on and got it close to passing for the O2 portion of the test, but hydrocarbons are still off the charts.

It is running pretty lean, but seems to be a misfire at high RPM when under load -- runs well, then feels like it gets these jumps of power making you think it isn't running well after all, and maybe could be running a lot better. Setting timing is pretty much black magic to me. You won't be able to tell me how to do it, I need to take a class.

It has a Mallory ignition, new plugs, new leads. It has an upgraded cam of some kind that I can't remember at this moment.

Right now, I'm thinking the only thing I can attempt is to put a cat in the exhaust.

Any other ideas?
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  #2  
Old August 17th, 2014, 08:24 PM
the rover shop
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shayne young
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Run it on race or aviation gas.. Available at most airports or race gas pumps.. But you will have to pump it into a gas container.. Most states it is illegal to put it into vehicles..5 or 10 gallons in an empty tank should get you through.. If you are running too lean you will get lean misfires causing hydrocarbons to increase.. What oil are you running in your carb dash pots.?? Should be ATF but can run engine oil in them..slows down the rising rate of the pistons and may get you through..you can also adjust the needle jet position.. Does require a special tool so you would need someone who does these kinda things..

------ Follow up post added August 17th, 2014 08:27 PM ------

Is t it emissions exempt..???? You can also have someone weld in an air pump after the exhaust manifolds and just pump air in.. That's how later cars get it past... Pumping straight air into the exhaust reduces the ratios..
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Old August 18th, 2014, 12:08 AM
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Dave Lucas
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What about mixing in some ethanol
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  #4  
Old August 18th, 2014, 01:02 AM
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Are you running without a catalytic converter at the moment?
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Old August 18th, 2014, 03:34 PM
RBBailey
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No cat, original exhaust.

Would the 100LL be good for this engine though? I would think the lead content might be a bad thing for the DEQ to detect.
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Old August 18th, 2014, 05:52 PM
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i think it would be impossible for an engine to pass hydrocarbon tests without a catalytic converter...but i could be wrong.

are you supposed to meet emissions for when the vehicle was manufactured?

sorry...i am not knowledgeable about your state regs...
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Old August 18th, 2014, 07:17 PM
RBBailey
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Yeah, found a place to put one in tomorrow. $$$... but what else can I do?

I'll let you all know if it passes.

So -- high octane gas is better on the HC end? And should I go for clear?
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  #8  
Old August 18th, 2014, 07:44 PM
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what are your HC #'s?
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  #9  
Old August 18th, 2014, 07:57 PM
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Doug Crowther
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Most states will issue a waiver if you can show you have spent $x to try to get your vehicle to pass.
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