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86 740 gle poor milage 12mpg

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  #11  
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Randy G.
 
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Default Re: 86 740 gle poor milage 12mpg - 10-01-2005 , 01:17 AM






"badboywithbadtoyz" <badboywithbadtoyz (AT) sbcglobal (DOT) net> wrote:

Quote:
replaced filter but still having same problem any other sugestions? also
found clogged catylatic convertor put hole in front of it and seems to
help some
12 mpg means that it is getting about half what it should, which means
that it is burning twice the fuel it should. This means that WAY too
much fuel is in the cylinders, and you can guarantee that it is
washing lubrication off the rings. Get this taken care of ASAP.

A certified shop can place a bypass pipe in place of the convertor for
testing purposes. Or you could drop the convertor and start it to see
if it runs better- that is, assuming that it is running bad now beyond
the bad fuel mileage.

Replacement convertors are available for about $125 on eBay.

BUT- if the car THINKS it is cold and not warming up it could be
enriching the mixture. Other things could cause that as well I would
think.

If you followed my diatribe on the AMM problem you can see that it
isn't always easy to find out what is wrong. Low spark voltage, bad
AMM, bad IAC valve, carbon tracking in the distributor cap, bad
ignition wires, bad coil, bad electronic ignition ground points, bad
fuel pressure regulator... get the idea? Who knows what it could be?
it took me two weeks to figure out that it was the AMM and only
because I got another one and tried it.

And one last factor that folks sometimes forget... does the car have a
locking gas cap? Remember the story of the guy who was bragging about
the mileage he was getting in his new VW, and the mileage slowly went
up each week to about 48mpg becasue his friends were putting gas in
his car each day? Later he was getting 12mpg when they started taking
the gas OUT!




__ __
Randy & \ \/ /alerie's
\__/olvos
'90 245 Estate - '93 965 Estate
"Shelby" & "Kate"


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  #12  
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Michael Pardee
 
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Default Re: 86 740 gle poor milage 12mpg - 10-01-2005 , 06:48 AM






"badboywithbadtoyz" <badboywithbadtoyz (AT) sbcglobal (DOT) net> wrote

Quote:
replaced filter but still having same problem any other sugestions? also
found clogged catylatic convertor put hole in front of it and seems to
help some

I had the cat in our 85 765T replaced for less than $150 US parts and labor
maybe ten years ago. It was at an independent shop in Phoenix a friend
recommended.

Isn't there an enormous amount of noise coming from that hole?

Mike




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