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PostPosted: Wed Jul 11, 2018 5:42 pm 
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Joined: Tue Aug 25, 2009 8:38 pm
Posts: 102
Year and Trim: 1997 SSEI 40th
Have all 3 codes P1200 Powertrain, P0135 O2 sensor Bank 1 sensor 1, and P0304 cyl. 4 misfire.

Have so far replaced spark plugs and wires (needed it) but codes have returned.

Get a blue smoke from tailpipe after short run on highway. Lots of stumbles. Smells very rich.

Thinking maybe a bad injector? Checked electrical connection for injector, it was fine.

Do I replace Cyl.4 injector with new? or get 6 new injectors?, or jump up to 42# injectors?.

First your thoughts on problem, then which solution.

Thanks

_________________
1997 SSEI 3.8 L67 149,000 miles Moonroof, Polished Gen V w/L32 intake, SD Headers, MagnaFlow Cat 94109, Catco catback, Autolite 103s, 180 stat, Intense FWI, 1995 OEM trans cooler, Cleared corners. KYB Excel G struts and shocks.


2006 Malibu SS 3.9 60 degree V6, Variable Valve, Tap shift Trans, 100,000 miles Bone stock

SOLD - 1992 SSEI FWI PEM Catco Cat NGK TR55 180 stat Original owner 209,000 miles Original Engine and Trans - Still strong when she left


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