Tracker emissions - Help!

My 91' Tracker failed emissions badly today...

As I'm selling it, I've gotta make it pass.

Basically failed on all 3 specs - NOx, CO, and HC...

My first thought is either the o2 sensor, or the cat...since there's
really little else (from my perspective, anyhow) to go wrong on these
engines, emissions wise.

I did change the plugs before the test, changed the oil and air
filter, and checked everything over..but still, a miserable failure.

Anyone have any related experience with Tracker / Sidekicks and
emissions problems?

What's the most common problem emissions wise for a 3-point failure
like this?

I'm most apt to try with just an o2 sensor to begin with, and go from
there...as I do suspect its overdue for one...but no SES light at this
point, though.

Cat may also be suspect...

Any suggestions / help appreciated. I suspect changing the o2 and cat
together will result in a pass, which is all I need to get rid of the
truck, but any other insight appreciated regardless..

Reply here, or email me

(Remove the obvious spamtrap before replying via email)

Thanks...Mark.

What's the mileage? If it's high, a new O2 sensor is probably a good call in
any case. The converter is more iffy however, it may or may not be bad.

--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from
Home Page: http://www.roberthancock.com/


"Mark" > wrote in message
om...
> My 91' Tracker failed emissions badly today...
>
> As I'm selling it, I've gotta make it pass.
>
> Basically failed on all 3 specs - NOx, CO, and HC...
>
> My first thought is either the o2 sensor, or the cat...since there's
> really little else (from my perspective, anyhow) to go wrong on these
> engines, emissions wise.
>
> I did change the plugs before the test, changed the oil and air
> filter, and checked everything over..but still, a miserable failure.
>
> Anyone have any related experience with Tracker / Sidekicks and
> emissions problems?
>
> What's the most common problem emissions wise for a 3-point failure
> like this?
>
> I'm most apt to try with just an o2 sensor to begin with, and go from
> there...as I do suspect its overdue for one...but no SES light at this
> point, though.
>
> Cat may also be suspect...
>
> Any suggestions / help appreciated. I suspect changing the o2 and cat
> together will result in a pass, which is all I need to get rid of the
> truck, but any other insight appreciated regardless..
>
> Reply here, or email me
>
> (Remove the obvious spamtrap before replying via email)
>
> Thanks...Mark.

What's the mileage? If it's high, a new O2 sensor is probably a good call in
any case. The converter is more iffy however, it may or may not be bad.

--
Robert Hancock Saskatoon, SK, Canada
To email, remove "nospam" from
Home Page: http://www.roberthancock.com/


"Mark" > wrote in message
om...
> My 91' Tracker failed emissions badly today...
>
> As I'm selling it, I've gotta make it pass.
>
> Basically failed on all 3 specs - NOx, CO, and HC...
>
> My first thought is either the o2 sensor, or the cat...since there's
> really little else (from my perspective, anyhow) to go wrong on these
> engines, emissions wise.
>
> I did change the plugs before the test, changed the oil and air
> filter, and checked everything over..but still, a miserable failure.
>
> Anyone have any related experience with Tracker / Sidekicks and
> emissions problems?
>
> What's the most common problem emissions wise for a 3-point failure
> like this?
>
> I'm most apt to try with just an o2 sensor to begin with, and go from
> there...as I do suspect its overdue for one...but no SES light at this
> point, though.
>
> Cat may also be suspect...
>
> Any suggestions / help appreciated. I suspect changing the o2 and cat
> together will result in a pass, which is all I need to get rid of the
> truck, but any other insight appreciated regardless..
>
> Reply here, or email me
>
> (Remove the obvious spamtrap before replying via email)
>
> Thanks...Mark.

try carb rebuild and adjust timing

Robrt White

try carb rebuild and adjust timing

Robrt White