Hi Brian
NOx is caused by high combustion temperatures. Cat usually takes care of
them. Lowering compression ratio lowers NOx. Your mechanic is right. read
all the bottles at your local auto store. Look for ones that you add to gas
and claims to remove deposits from combustion chambers, stop pinging, etc.
Takes a tank or 2 to get done. Second thing is to retard ignition to the
maximum allowed by the spec, use up all tolerance. This is the same as
lowering CR. If you could get away withit more retard would solve NOx probs
but they will check it and adjust it. Your goal is to get it retarded as
much as you can get by with without the inspector "fixing"it. Third add
about a pint of isopropyl alcohol to 1/3 tank of gas (this lowers
combustion temps) just before test.
Remember also that the cat must be real hot to work.
LOL Eric
At 01:58 PM 8/17/2004, Brian wrote:
Hello All,
I have a 1988 Jetta GLI, 16V, with an 1989 GLI engine. I just changed
my catalytic converter about 2 weeks ago. I changed the oil about 3 weeks
ago.
I went to get the smog done, and found my NO #'s are double whats allowed
in the state of California. All the othe numbers look beautiful. I asked a
mechanic
friend what he thought I could do to get the NO #'s down, and suggested I
may have
some carbon on the heads of the pistons. He suggested I get a chemical
cleaner (forgot the name of it), and pour it down the spark plugs holes in
the head. Let it sit for a few hours and then re-fire up the engine. He
suggests this will help the carbon build-up.
Any idea if he knows what he is talking about? That sounds abit extreme to
me, but what else can I check, to help lower the NO #'s?
Thanks,
Brian
MICHAEL INGRAM <[email protected]> wrote:
Hello all,
I never did find any vacuum leaks even though it sure seemed there should
have been.
As I had said a few days ago while I was working on the car I realized the
oxygen sensor wires has came loose and fallen against the exhaust and
melted thru so replaced the plugs. I knew the car had been running 1.5
years ago when I took it off the road.
Anyway unplugged the oxygen sensor and all hesitation and bog entirely
disappeared. Now it does idle up and down(maybe even more than before)but
runs pretty good otherwise.
I still have not ruled out fuel delivery problems and I am planning to
replace (the under car) fuel reservoir assembly
due to it being extremely rusted and if there isnt leaks yet there may
very well be soon.
My questions:
The oxygen sensor on our car is this a dealer only item?
I remember in the past the mention of an interchangeable sensor from a
domestic car..does anyone remember anything about this? I shudder at the
thought of buying this from the VW dealer.
another question.....I noticed my air stabilizer is running(vibrating) but
it clicks often, sya every few seconds??Is this normal? Or is the result
of my disconnected O2 sensor?
Last question....the complete fuel reservoir are they interchangable say
from a 90 jetta (my gti is 89).
Thanks again for your help
Mike
----- Original Message -----
From: "MICHAEL INGRAM" >
To: "a2-16v-list" >; "A216VMember"
>
Sent: Friday, August 13, 2004 5:12 PM
Subject: [a2-16v-list] running problems
Hello,
Have an update on my clutch/tranaxle project. Wednesday I got the car off
the jackstand after doing a few remaining odd things. Took for a ride and
clutch seems fine. New problem car was idling up and down ( I had already
cleaned throttle body etc.) so I replaced the air idle stabilizer with one I
had lying around. Seems to idle okay once it warms up about 3 or 4 minutes.
This is the deal....when it first starts (even though it will stall if I let
it) when I give it gas it revs up normal...after just 5 or 6 minutes when I
give it gas it bogs down. Now as I said after 5 or 6 minutes it will stay
running but when I give it gas it starts to rev a little then bogs down
almost immediately.So at first wont stay running but will rev fine. After 5
or so minutes it will idle but bogs down terrible. If I work with it a bit
and give it continued pumping it catches and as it works above say 2000 rpm
and will rev great then (until I let itgo down into lower rpms...then same
thing all over. One more thing..I have to sometimes floor it to get it to
start unless its cold (then it starts right up).
I cant find any vacuum leaks. Changed the fuel filter while I was under
there. Wires are almost new. I believe timing is pretty close.Car did sit
for about 1 year and 3 months.
I would appreciate any ideas anyone might have.
Thank you
Mike Ingram
89 gti 16v
92 camaro
00 jeep wr sprt
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