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  #1  
Old May 1st, 2012, 03:58 PM
Defender_90
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Kevin Doonan
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Failed Emissions!

Hello all,

So my 94 Defender 90 just failed emissions. Totally sucks, but I have until June to figure it out.

I was wondering though if anyone has any suggestions from past experiences for what it could be?

In CT the limit is 220 hydro carbons while at cruising speed, roughly 2750 rpms. I am at 260....

The other issue that I have is that the dealer installed A/C is hiding the hook up for my mecahnic to do a diagnostic on the truck? Any advice? should i just take the A/C out?

Any help is help!

Thanks,

KD
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  #2  
Old May 1st, 2012, 04:16 PM
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Don't take the AC out ... the diagnostic port is a white 5 way connector that has a plug in it to loop out electrical noise. I can't imagine that it's completely inaccesible ... he may need to remove a couple of covers.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #3  
Old May 1st, 2012, 04:17 PM
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Your own mechanic failed you?! What is this truck you bought? Post up some details. If he's your mechanic you'd think he'd have given you an idea as to what might be causing the issue. Do not take your A/C out it should be somewhat accessible.


I would suggest searching something like "hydrocarbons" and you'll find useful info as recent as this:

http://www.defendersource.com/forum/...t=hydrocarbons

Check your injectors, etc. as hydrcarbons is a result of unburnt fuel. I think there is a diagram in the PDF I already sent you of the proper order for them to check.
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Old May 1st, 2012, 04:17 PM
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2750 is high rpm for cruising ... i tend to be lower and slower ...

------ Follow up post added May 1st, 2012 04:21 PM ------

The diagnostics on a 94/95 are pretty limited ... hopefully your mechanic has plenty of experience on these trucks ...
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #5  
Old May 1st, 2012, 04:22 PM
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change oil, do tune up, test hot. It will pass.
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  #6  
Old May 1st, 2012, 04:23 PM
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If you have a IR temp gun (cheap, $25 or so), measure the inlet and exit temperatures of your CATs for symmetry. If off, one could be partially blocked.
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Old May 1st, 2012, 04:24 PM
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has it thrown any fault codes??
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #8  
Old May 1st, 2012, 04:31 PM
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Kevin Doonan
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Quote:
Originally Posted by evilfij View Post
change oil, do tune up, test hot. It will pass.

Thanks everyone for the input. But I just had a tune-up, some tune up eh? and I had driven on the highway for 15 minutes to the DMV and than to the shop to get it checked....looks like its going to be going back to the mechanic for a check up.... its been a tough two weeks finacially with the truck haha
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Old May 1st, 2012, 04:35 PM
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what is this truck you bought?
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  #10  
Old May 1st, 2012, 04:47 PM
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Kevin Doonan
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Bought the truck from down in Nashville, TN. Red 1995 with badge 1219.

I will post pics when I get come. Had another LR guy check it out before buying and he said it was a solid truck. Hit 100k miles and speedo went dead and tried the fix, but it didnt work that well for me.

Only thing i know is that its killing my bank account haha thus I want to figure stuff out myself now.
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  #11  
Old May 1st, 2012, 04:49 PM
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Check the vacuum line to the pressure regulator- split, or off, will run the fuel pressure higher than normal contributing to more unburned fuel, in conjunction with a manifold vacuum leak, without codes or poor running. CU14x isn't the smartest engine management system. Compotent, just not real smart.
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  #12  
Old May 1st, 2012, 04:53 PM
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1995? I thought you had said it was a 1994 with square rear lights?

Ah, OK this one.
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  #13  
Old May 1st, 2012, 05:09 PM
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If your mechanic has an exhaust gas analyzer (I assume he does since he does inspections), I'd ask him to test your catalyst efficiency. This basically involves testing the exhaust before the cats, then after, on similar drive cycles. You don't seem to far off, there's a good chance your cats are just a little tired. Ever replaced them?
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  #14  
Old May 1st, 2012, 05:29 PM
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Quote:
Originally Posted by rijosho View Post
1995? I thought you had said it was a 1994 with square rear lights?

Ah, OK this one.

Thats it.
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  #15  
Old May 1st, 2012, 11:54 PM
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leaking fuel pressure regulator, leaking injector, timing, bad vacuum timing advance unit, vacuum leak, defctve 02 sensors, defective coolant temp sensor, wide open or no thermostat thus not reaching proper operation temp, dirty intake filter and or defective cats, are some of the issues which would cause high hydrocarbon output.
as someone said before hydrocarbon is unburnt fuel...
you dont mention your engine running rough so im not going into the mechanical issues whch would make it run rich thus spew high hc's.
not putting down your mechanic, but he should have and idea as to what goes into the engine and what comes out as well as the reason for that mix.
with numbers so close, I would dare say timing is off by a few degrees, more than likely it is set at 10 btdc when it should be 6 btdc.
good luck.
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  #16  
Old May 2nd, 2012, 12:06 AM
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Who's your mechanic?
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  #17  
Old May 2nd, 2012, 03:32 AM
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Suspect you bought a bit of an unmaintained dog which needs proper sorting before you'll make the emissions test.
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