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Old 07-01-2009, 07:10 PM   #1
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91 Z28. codes? 33, 44,45, and 46?? TPI

Im still trying to find a good book or thread for chevy codes. I could use some help on these 4 codes. Thanks gentlemen
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Last edited by gasmonkey; 07-01-2009 at 08:57 PM. Reason: codes
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Old 07-01-2009, 07:59 PM   #2
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI

http://www.thirdgen.org/service-engi...ht-error-codes

The best book for troubleshooting is the Helm FSM.

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Old 07-01-2009, 08:58 PM   #3
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI

thank you sir
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Old 07-02-2009, 02:59 AM   #4
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI

I reset the codes by unhooking the battery. Now im getting a code 44 constantly. That means Oxygen sensor is lean. I understand what lean means, but does that mean the Oxygen sensor is bad? I went ahead and pulled it out. Its burnt to heck. The car stalls out all the time when I brake after it gets good and warmed up. Im tired of having to start my car in middle of a stop sign or traffic light. Any insight???
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Old 07-02-2009, 09:43 AM   #5
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI

It may be that the O2 sensor is bad. I would check the fuel pressure first. That is certain to cause the issues you are seeing (including the code 44).

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Old 07-02-2009, 12:48 PM   #6
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI

Ill see if I have a way of checking the fuel pressure. If fuel pressure is the case, how do I get more fuel pressure? Fuel pressure regulator?
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Old 07-02-2009, 03:00 PM   #7
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI

There is a fitting on the fuel rail to connect a gauge. If the pressure is dropping off common causes are: filter is clogged, fuel pump is dying, turtle is leaking, inadequate voltage to fuel pump.

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Old 07-02-2009, 05:41 PM   #8
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI

I put the new o2 sensor in. It seems to be running alittle better. i need to drive it around some more to really tell. Ill check all the fuel sources and go from there. Thanks for your help.
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Old 07-03-2009, 02:07 PM   #9
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI

Most common source of a lean code is a vac leak... Have you read your plugs? That would indicate if its actually a lean condition or a sensor failure.
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Old 07-03-2009, 02:07 PM
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