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735i '85 failed smog



 
 
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  #1  
Old April 7th 05, 07:47 PM
Jeremy
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Default 735i '85 failed smog

The engine has been running rough at idle for a while and the tail pipes
have been a little dark as though it is running a bit rich. It failed
the smog test on NO.

I will be changing the plugs tomorrow and starting the check of the
other laundry list of things that might be wrong, but the guy who wants
my money just keeps saying it is the catalytic convertor.

Any comments?

JJ
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  #2  
Old April 7th 05, 08:41 PM
fbloogyudsr
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Default

"Jeremy" > wrote
> The engine has been running rough at idle for a while and the tail pipes
> have been a little dark as though it is running a bit rich. It failed
> the smog test on NO.
>
> I will be changing the plugs tomorrow and starting the check of the
> other laundry list of things that might be wrong, but the guy who wants
> my money just keeps saying it is the catalytic convertor.


Well, it could be the cat, but you need to look for air leaks in the
intake system, including all the hoses and tubes, first. The cat
is the *last* thing you should replace. A plugged cat may indeed
cause similar symptoms to intake system air leaks, but a good
mechanic should be able to diagnose these problems separately.

Floyd
  #3  
Old April 7th 05, 10:35 PM
R. Mark Clayton
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"Jeremy" > wrote in message
...
> The engine has been running rough at idle for a while and the tail pipes
> have been a little dark as though it is running a bit rich. It failed
> the smog test on NO.
>
> I will be changing the plugs tomorrow and starting the check of the
> other laundry list of things that might be wrong, but the guy who wants
> my money just keeps saying it is the catalytic convertor.
>
> Any comments?
>
> JJ


Change the oil and don't put too much in.
Tweak the injection to optimal.
Gap or change plugs, change air filter & other routine service items.
Go for a longish steady run just before the test.


  #4  
Old April 9th 05, 05:35 AM
Jeremy
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"R. Mark Clayton" wrote:
>
> > JJ

>
> Change the oil and don't put too much in.
> Tweak the injection to optimal.
> Gap or change plugs, change air filter & other routine service items.
> Go for a longish steady run just before the test.


Tnx

JJ
  #5  
Old April 11th 05, 09:11 PM
Nicik Name
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Posts: n/a
Default


"Jeremy" > wrote in message
...
> The engine has been running rough at idle for a while and the tail pipes
> have been a little dark as though it is running a bit rich. It failed
> the smog test on NO.
>
> I will be changing the plugs tomorrow and starting the check of the
> other laundry list of things that might be wrong, but the guy who wants
> my money just keeps saying it is the catalytic convertor.
>
> Any comments?

he is right-
--------
>
> JJ



 




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