[MR2] Emissions Issues, was Re: Zack's mr2
priamyd at comcast.net
Mon Feb 28 17:21:11 EST 2011
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
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 -
> 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?
> ----- 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
>> 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.
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