[MR2] Emissions Issues, was Re: Zack's mr2

[Joel]

for low mileage, i would first look at replacing the spark plugs, then 
plug wires.  simple and easy stuff.

also, remove the EGR canister and clean it - look into replacing ALL 
vacuum lines.

beyond that, i'd run a compression test, to see if the rings or valves 
might not be sealing as well as they need to.

- Joel -



Benn wrote:
> And when I had my Mk I '86 with 125K done two years ago, I was within 
> 1ppm of failure (on HC, as I recall).  I assumed the cat was failing, 
> and for sure would have to replace it this time to get it to pass.  
> Last month, had it tested and passed, with HC about 2/3 of max 
> allowable.  Go figure.  But, perhaps another clue--a recent fillup 
> only got ~20mpg!  Hmm.  Injectors getting hinky?  Thoughts?
> Benn
>
> ----- Original Message ----- From: "William Brandt" 
> <wbrandt1 at sbcglobal.net>
> To: "MR2 List" <mr2 at mr2.com>
> Sent: Monday, February 28, 2011 9:33 AM
> Subject: [MR2] Zack's mr2
>
>
>> Usually if you know what gasses are over the limit you can tell what 
>> component is bad. On my 86 it always been either the O2 sensor or the 
>> cat.
>>
>> And if the cat at the dealer is too expensive NAPA  has in the past 
>> sold a direct bolt-in unit.
>>
>> Speaking of O2 sensors I have learned something about them.
>>
>> In both of my old cars the sensors have had a lot of miles on them - 
>> in the case of the Mercedes - 200K miles and the MR2 - at least 
>> 100,000 miles.
>>
>> I noticed at night in the Mercedes the O2 light would come on just 
>> for an instant at times so I put a new one in and mileage went up a 
>> mile per gallon.
>>
>> I am thinking if they are old even if the warning light doesn't come 
>> ion and stay on it is good to replace them.
>>
>> Bill
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>
>
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