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  88 Duke poor gas mileage with an occasional code 44 cured.

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88 Duke poor gas mileage with an occasional code 44 cured. by hercimer01
Started on: 05-20-2014 03:55 AM
Replies: 3 (140 views)
Last post by: hercimer01 on 05-20-2014 09:42 AM
hercimer01
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Report this Post05-20-2014 03:55 AM Click Here to See the Profile for hercimer01Send a Private Message to hercimer01Edit/Delete MessageReply w/QuoteDirect Link to This Post
My 88 duke was getting 28 MPG normally then it went to 21 with an occasional SES code 44 at idle in a stop light.

Code 44 => Lean exhaust, O2 measured too low

I found a small crack in the exhaust manifold, I mean small. Hairline! I thought no, really. But yes, that was it.
I went to the local LKQ and they had one 1989 Chevy Celebrity with a Tech4 in it. The manifold is an exact fit.
My gas mileage is now back to 28 MPG @ 70MPH highway w/an automatic.











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Project Genisis Lo Budget 3800SC swap
12.840@104.8 MPH Intense-Racing 1.9 rockers, 3" exhaust, 3.4 pulley, ZZP tune and 18 year old tires.

88 Coupe under construction

88 formula 3.4L 4t60 swap SOLD

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Ang84Indy
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Report this Post05-20-2014 06:44 AM Click Here to See the Profile for Ang84IndySend a Private Message to Ang84IndyEdit/Delete MessageReply w/QuoteDirect Link to This Post
Thanks for posting! I have an '87 Duke, but this information is helpful to everyone.
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Csjag
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Report this Post05-20-2014 06:57 AM Click Here to See the Profile for CsjagClick Here to Email CsjagSend a Private Message to CsjagEdit/Delete MessageReply w/QuoteDirect Link to This Post
How did you get the rusty manifold bolts off?
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hercimer01
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Report this Post05-20-2014 09:42 AM Click Here to See the Profile for hercimer01Send a Private Message to hercimer01Edit/Delete MessageReply w/QuoteDirect Link to This Post
They all came out ok except for one. The three in the middle are 15MM and one almost broke my Harbor freight wrench so I used my craftsman wrench. It was close.
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