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Old 09-20-2005, 10:01   #1 (permalink)
PatLMac
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Emissions Question

I just had the emissions tested on my 1988 Town Car. It passed every
test well, except for the NO (nitrous oxide), which it failed
miserably, with twice the allowable emissions. Anyone had this
problem or know the possible causes??

Any info would be appreciated.
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Old 09-20-2005, 12:01   #2 (permalink)
C. E. White
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Re: Emissions Question

EGR problem.


"PatLMac" <patlmac1@optonline.net> wrote in message
news:e0d0j1d8gnkt97g5dvark5jimek3qc7uc4@4ax.com...
> I just had the emissions tested on my 1988 Town Car. It passed every
> test well, except for the NO (nitrous oxide), which it failed
> miserably, with twice the allowable emissions. Anyone had this
> problem or know the possible causes??
>
> Any info would be appreciated.



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Old 09-20-2005, 17:01   #3 (permalink)
sleepdog@optonline.net
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Re: Emissions Question

Check your EGR valve for correct operation, all related vacuum lines
and EGR solenoid and vacuum regulator if equipped. There also might be
two 1/4" metal tubes coming from your exhaust and egr feed lines for
backpressure sensing. Sometimes they rot and break off.

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Old 09-20-2005, 21:01   #4 (permalink)
lugnut
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Re: Emissions Question

On Tue, 20 Sep 2005 12:09:11 -0400, PatLMac
<patlmac1@optonline.net> wrote:

>I just had the emissions tested on my 1988 Town Car. It passed every
>test well, except for the NO (nitrous oxide), which it failed
>miserably, with twice the allowable emissions. Anyone had this
>problem or know the possible causes??
>
>Any info would be appreciated.



Normally an EGR system problem. You need to have the ECM
scanned for any fault codes. Problem could be bad EGR
valve, EVP sensor, plugged tube, vacuum leak or other
problems. You also need to make sure the ignition timing is
correct. Some parts stores like Autozone will scan it for
stored codes

Lugnut
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Old 09-21-2005, 18:01   #5 (permalink)
PatLMac
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Re: Emissions Question

Thanks for your help everyone,

I'll get right to work on it.
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Old 09-28-2005, 11:01   #6 (permalink)
Awelch
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Re: Emissions Question

When my Dodge cargo van tested high on Nitrous Oxide, I couldn't find
any OBD computer codes to explain it. I took it to a mechanic who
replaced the O sensor and catalytic converter. I think it was the
catalytic converter that fixed the problem rather than the O sensor
which wasn't very old at the time.






C. E. White wrote:
> EGR problem.
>
>
> "PatLMac" <patlmac1@optonline.net> wrote in message
> news:e0d0j1d8gnkt97g5dvark5jimek3qc7uc4@4ax.com...
>
>>I just had the emissions tested on my 1988 Town Car. It passed every
>>test well, except for the NO (nitrous oxide), which it failed
>>miserably, with twice the allowable emissions. Anyone had this
>>problem or know the possible causes??
>>
>>Any info would be appreciated.

>
>
>

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