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PostPosted: Wed Jul 11, 2018 5:42 pm 
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Joined: Tue Aug 25, 2009 8:38 pm
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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

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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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PostPosted: Fri Jul 20, 2018 2:36 pm 
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Location: Dearborn, MI
Year and Trim: '93 SSEi
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You might try swapping the injector with #6 and see if the code follows. You can also use a DMM to test the resistance across the two injecor pins, and compare it to the others. If it's reading abnormal resistance or open circuit then that's reasonable to suggest the injector is bad.

Unless you're planning some performance mods, I see no reason to use anything but a stock replacement(s) sensor.

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I don't know how much boost it takes to blow the tires off. But I know how much I'm going to use!
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'97 Chevy Camaro - 3800, T5, T-tops, Getting ready for some major upgrades!
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'87 Buick LeSabre T-type - future victim
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PostPosted: Fri Jul 20, 2018 10:35 pm 
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Joined: Tue Aug 25, 2009 8:38 pm
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Year and Trim: 1997 SSEI 40th
thanks Matt. when I started to remove the injector electrical connection on Cyl.4 I found that it was very taunt. During upgrade I had incorrectly run the wiring harness creating tension on that injector's connection. Rerouted the harness correctly, cleaned Elec. connections on fuel injector. Code is gone

_________________
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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PostPosted: Sun Jul 29, 2018 3:54 pm 
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Joined: Tue Aug 25, 2009 8:38 pm
Posts: 105
Year and Trim: 1997 SSEI 40th
Code has returned. P1200 and P0304. Going to swap injectors to test them. I hope it is not a burned valve or chipped piston.

_________________
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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