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Added cat converter now 79 midge is running bad...

Posted by Jecklen16

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Added cat converter now 79 midge is running bad... #1
Jecklen16 Michael Drew Goodyear AZ, USA 1979 MG Midget 1500	Posted: March 15, 2012 03:32PM Registered: 2 years ago Posts: 309

Hey guys I have a 79 Midget, when I bought it about a 3 weeks ago it had no catalytic converter on it, just a pipe back to a quad pacesetter exhaust system. I took it to emissions and needless to say I failed miserably. So this weekend I put the original cat converter back on, it fit perfectly no issues. However NOW my car sometimes sounds like its doing a very very minor backfire when I let off of the exhaust and when I put my foot down hard on the gas from idle, it just bogs and then makes a sound like a hammer hitting my engine (only did this 1 time, as I know this cannot be good). I checked the entire exhaust system and see no leaks anywhere... my only thought is that the cat (since it's not new and I have no idea how long ago they took it off) is clogged or dirty and not letting much exhaust through... But again I have no idea if that would cause these issues. Any help would be greatly appreciated.

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Re: Added cat converter now 79 midge is running bad... #2
AmishIndy Seth Jones Wheaton, IL, USA 1971 MG Midget MkIII "Guenevire" 2007 Mazda 3 "Porco Rosso"	Posted: March 15, 2012 03:35PM Registered: 2 years ago Posts: 3,083

well, maybe the dealer traning booklet on the emissions system might help.

http://www.spridgetguru.com/TchIndx06a_files/BLDlrTrng_S1044.pdf

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Re: Added cat converter now 79 midge is running bad... #3
Jecklen16 Michael Drew Goodyear AZ, USA 1979 MG Midget 1500	Posted: March 15, 2012 03:51PM Registered: 2 years ago Posts: 309

Ok so now I understand how the cat converter works and am 12,000 miles short of having to replace it so I don't know what the issue is... It did mention misfires, is that the same as a backfire?

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Re: Added cat converter now 79 midge is running bad... #4
WayneW Wayne Witgenstein Nashville, Tennessee, USA	Posted: March 15, 2012 04:45PM Registered: 2 years ago Posts: 1,006

Is the AIR pump still on the car and working? The cat needs this additional air to burn off the stuff in the exhaust. Not only that, but running a cat without the air injection system will make the cat get hot, very hot, maybe even cherry red hot, and thats not good.

-Wayne

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Re: Added cat converter now 79 midge is running bad... #5
Jecklen16 Michael Drew Goodyear AZ, USA 1979 MG Midget 1500	Posted: March 15, 2012 04:52PM Registered: 2 years ago Posts: 309

I just checked it, the air pump is still on and working.

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Re: Added cat converter now 79 midge is running bad... #6
littlecars David Bassett Nashville, Tennessee, USA 1970 Triumph Spitfire MkIII "Tamara's Turd" 1974 MG Midget MkIII "Lizzy"	Posted: March 15, 2012 06:15PM Registered: 1 year ago Posts: 819

In reply to # 2012514 by AmishIndy well, maybe the dealer traning booklet on the emissions system might help.

http://www.spridgetguru.com/TchIndx06a_files/BLDlrTrng_S1044.pdf

DANG! Where do I get one of these original printed bulletins for the emissions on my 1974 Midget 1275? This is just what I need to show me the B-L scope of their rudimentary emissions design.

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Re: Added cat converter now 79 midge is running bad... #7
AmishIndy Seth Jones Wheaton, IL, USA 1971 MG Midget MkIII "Guenevire" 2007 Mazda 3 "Porco Rosso"	Posted: March 15, 2012 07:22PM Registered: 2 years ago Posts: 3,083

I lucked out with this find on ebay.

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