[xj] everclear good to get around hydrocarbon test?

I was wondering if anyone has tried this:
Use all fuel in one tank
Buy 1 or 2 bottles of ever clear or something 18-190 proof.
Put in empty tank.
Used that tank for the emissions test.
I hear that it works but I never have tried it.
Any ideas?
Lee–
1983 xj6 cobalt blue
Coraopolis, United States
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In reply to a message from doransignal sent Thu 8 Sep 2005:

I am getting ready to get my cat smogged here in the lovely state
of California where it has to be the toughest emission laws
around. Anyway, someone told me to use a half gallon of denatured
alcohol in each tank. Any thoughts on this?

JR 1984 XJ6 III–
JR
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Yes, pretty much standard procedure… dunno if it is truly effective, but we
all seem to do it… no more than 1/2 gal in a tank, proportionately less if
it’s under 1/2 full.

Ken

87 SIII - “Fireball”
180,000+ Miles - A Great Daily Driver, Mechanically solid, body tired

87 SIII VDP
110,000+ Miles, my New Daily Driver, needing only little things here and
there

Snipped Reply Follows>>>>>>>>

I am getting ready to get my cat smogged here in the lovely state
of California where it has to be the toughest emission laws
around. Anyway, someone told me to use a half gallon of denatured
alcohol in each tank. Any thoughts on this?

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Have also heard of people pulling the electric input on one fuel
injector before taking the test. With no fuel coming in to the
cylinder turns it into a large air pump.

To tell the truth have never had any problems with the sniffer test.
If the engine is in descent condition it should not need any
“bandaids” to pass, but I am in Arizona and we are not the strictest
in the country.

Joe AOn 8 Sep 2005 at 19:03, JR wrote:

I am getting ready to get my cat smogged here in the lovely state of
California where it has to be the toughest emission laws around.
Anyway, someone told me to use a half gallon of denatured alcohol in
each tank. Any thoughts on this?

JR 1984 XJ6 III

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In reply to a message from doransignal sent Thu 8 Sep 2005:

High HC’s can be caused by many other engine issues. Instead of
just trying to pass the test, I would check out some of the devices
that affect the fuel/air ratio.

I had a bad AFM last inspection/emissions test. The HC’s were
about 273ppm IIRC, 275 was the limit so I squeaked by. Point is,
the car was running like crap, blowing black smoke, sputtering.
After swapping out the AFM (used one worked fine), the car was like
new. All of the ignition components were renewed, O2 sensor new,
verified proper readings on the CTS (a common cause of a poorly
running engine).

I am not a tree hugger, but your car will run way better if you get
the HC’s back down to a reasonable level since it is usually a sign
of an improperly tuned engine, and besides it will pollute less.
These cars are already not the greatest at the amount of pollution
they put out since they use oil on a normal basis, and have large
engines that may not be as efficient as todays.–
Dave Williamson 1985 XJ6 Vanden Plas Lansdale, PA
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Joe,
Ca used to be okay for jags, go to a test & repair place where they’d run a
preliminary test, adjust as required, and bingo… Now most (all?) sIII go to
test only stations, in off the street, hooked up and tested… guess is
about 50% fail this … as in on both mine, one failed, required 400 plus is
work…

Ken
Snipped Reply Follows>>>>>>

, but I am in Arizona and we are not the strictest> in the country.

Joe A

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JR Just for the record I recently compared your allowable limits laid out in
your test to those used up here in Ontario Canada. Our limits are set at
approximately half of what you are allowed for both the six cylinders and
twelve cylinder cars. If fact I was really surprised to see that California
was so liberal after all I have read and heard.

So in short California is nowhere near the toughest place to get emissions
done. In fact you have it quite easy compared to us. Your car should breeze
through the test if it is set up right.

Bob.>From: “JR” russtri@aol.com

I am getting ready to get my cat smogged here in the lovely state
of California where it has to be the toughest emission laws
around. Anyway, someone told me to use a half gallon of denatured
alcohol in each tank. Any thoughts on this?

JR 1984 XJ6 III

JR
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At 10:17 2005-09-08 -0700, Joe Abrahamson wrote:

Have also heard of people pulling the electric input on one fuel
injector before taking the test. With no fuel coming in to the
cylinder turns it into a large air pump.

Er, and the O2 sensor sees the excess OXYGEN (unburnt air charge) and
enriches the mixture on all of the other cylinders.

Bad idea.

— '88 Jaguar XJ-SC 5.3L V12 (LHD) ‘Black Cat’
Sean Straw '85 Jaguar XJ-S 5.3L V12 (LHD) ‘Bad Kitty’
Sonoma County, California '91 Jaguar XJ40 4.0L (LHD) ‘Trevor’
http://jaguar.professional.org/ '69 Buick GranSport 455 V8===================================================
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In reply to a message from doransignal sent Thu 8 Sep 2005:

I’m not sure how well it works, but I think it helped my 91
pass emissions.

Don’t go to the liquor store for Everclear. Go to Home
Depot of the like and get denatured alcohol.–
Maynard 94 XJS V12 Coupe 91XJS(RIP) 86XJ6 78MGB 67MGB
Niles, IL, United States
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In reply to a message from Maynard sent Thu 8 Sep 2005:

I will buy the everclear but for drinking puposes only :slight_smile: Now the
denatured alcohol will be for the Cat to drink. (MEOW)–
JR
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To tell the truth have never had any problems with the sniffer test.
If the engine is in descent condition it should not need any
“bandaids” to pass, but I am in Arizona and we are not the strictest
in the country.

Agreed. If things are working correctly, it should pass just fine. Find out what the problem is and try to fix it.===================================================
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In reply to a message from sean.straw%2BJaguar@mail.professional.org sent Thu 8 Sep 2005:

What then would be the harm in disconnecting the O2 sensor.
Will the ecu still enrich the gas?–
The original message included these comments:

Er, and the O2 sensor sees the excess OXYGEN (unburnt air charge) and
enriches the mixture on all of the other cylinders.


82 Series III XJ6 140k+
Berkeley, United States
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At 02:10 2005-09-09 +0200, Ryan A. wrote:

What then would be the harm in disconnecting the O2 sensor.
Will the ecu still enrich the gas?

Well, then the ECU wouldn’t be able to make adjustments according to the
combustion conditions. On top of that, later cars (not your earlier 82 -
though, other than the SIII XJ12 (I think), I don’t think any of the S2-III
XJ models throw codes) will throw a code because the O2 isn’t
reading. Since emissions tests in many areas include reading the ECU codes
(when the ECU stores such things), generating a code like this wouldn’t be
good, even if the ECU were capable of maintaining a sufficient fuel map.

I’ve had emissions issues in the past (an ignition amp that misfired at
RPM), but why try to engineer a method to pass emissions instead of
addressing the problem itself?

— '88 Jaguar XJ-SC 5.3L V12 (LHD) ‘Black Cat’
Sean Straw '85 Jaguar XJ-S 5.3L V12 (LHD) ‘Bad Kitty’
Sonoma County, California '91 Jaguar XJ40 4.0L (LHD) ‘Trevor’
http://jaguar.professional.org/ '69 Buick GranSport 455 V8===================================================
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In reply to a message from sean.straw%2BJaguar@mail.professional.org sent Fri 9 Sep 2005:

Sean,

You’re correct that the Series 3 V12 cars don’t have the
code function. They do have heated 3 wire O2 sensors though.

Craig
92 VDP, #53 of the last 100–
The original message included these comments:

Well, then the ECU wouldn’t be able to make adjustments according to the
combustion conditions. On top of that, later cars (not your earlier 82 -
though, other than the SIII XJ12 (I think), I don’t think any of the S2-III
XJ models throw codes) will throw a code because the O2 isn’t


Craig 64 OTS/ 92 VDP
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At 04:55 2005-09-09 +0200, Craig Talbot wrote:

You’re correct that the Series 3 V12 cars don’t have the code function.

Then actually, I was incorrect - I can’t remember whether the SIII XJ12
maintained Lucas ignition to the end of it’s life, or if it ever used the
Marelli (the accompanying EFI ECU reports codes via the trip computer - at
least on the XJ-S).

They do have heated 3 wire O2 sensors though.

Heated or not, disconnecting the O2 should cause the ECU to either have
problems (because it’s getting a floating input), or to disreguard the O2
sensor input and use a map (as it would when you’re in Park or Neutral),
which is inefficient for dealing with the variations at speed.

— '88 Jaguar XJ-SC 5.3L V12 (LHD) ‘Black Cat’
Sean Straw '85 Jaguar XJ-S 5.3L V12 (LHD) ‘Bad Kitty’
Sonoma County, California '91 Jaguar XJ40 4.0L (LHD) ‘Trevor’
http://jaguar.professional.org/ '69 Buick GranSport 455 V8===================================================
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Sean Straw wrote:

Heated or not, disconnecting the O2 should cause the ECU to either
have problems (because it’s getting a floating input), or to
disreguard the O2 sensor input and use a map (as it would when you’re
in Park or Neutral), which is inefficient for dealing with the
variations at speed.

With the O2 sensor defective or disconnected, the ECU just goes to plan
B, Sean…

Which is perfectly adequate for running the engine with the basic inputs
without using the Lambda circuit at all. In fact most don’t even know if
the O2 sensor is working or not - untill they possibly fail an emission
test…:slight_smile:

Tthe Lambda is a refinement of the original fuel management, not a
substitute. And when the system goes “open loop”, which it is frequently
required to do, the Lambda circuit excerts no influence. It’s just like
power steering; there is a plan B…

Mine perform exelently without it - being born without…:slight_smile:

Frank
xj6 85 Sov Europe (UK/NZ)===================================================
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doransignal wrote:

I was wondering if anyone has tried this:
Use all fuel in one tank
Buy 1 or 2 bottles of ever clear or something 18-190 proof.
Put in empty tank.
Used that tank for the emissions test.
I hear that it works but I never have tried it.

The xk was not meant to run on alcohol, Lee - and there are some issues
with rubbers and alcohols as well. Probably less controversial in the
engine than in the driver, but still…:slight_smile:

Frank===================================================
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Sean: the V12 Series III cars used the Lucas ignition right to the end
of 1992.
Gregory-----Original Message-----
From: owner-xj@jag-lovers.org [mailto:owner-xj@jag-lovers.org] On Behalf
Of Sean Straw
Sent: September 8, 2005 9:36 PM
To: xj@jag-lovers.org
Subject: Re: [xj] everclear good to get around hydrocarbon test?

At 04:55 2005-09-09 +0200, Craig Talbot wrote:

You’re correct that the Series 3 V12 cars don’t have the code function.

Then actually, I was incorrect - I can’t remember whether the SIII XJ12
maintained Lucas ignition to the end of it’s life, or if it ever used
the
Marelli (the accompanying EFI ECU reports codes via the trip computer -
at
least on the XJ-S).

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Sean,

The S3 V12’s kept Lucas ignition right to the end of production in
November, 1992.

Craig
92 VDP

Sean Straw wrote:>

Then actually, I was incorrect - I can’t remember whether the SIII
XJ12 maintained Lucas ignition to the end of it’s life, or if it ever
used the Marelli (the accompanying EFI ECU reports codes via the trip
computer - at least on the XJ-S).

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In reply to a message from Ryan A. sent Fri 9 Sep 2005:

Any engine component that is found to be disconnected will
cause immediate failure of the emmisions test. You will then
be sent to test only stations (if you are not already) for the
remainder of the time the car is registered in CA–
Dave Waldman 61 OTS
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