91 Z28. codes? 33, 44,45, and 46?? TPI
07-01-2009, 06:10 PM
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Car: 1992 z28
Engine: 5.7 350
Transmission: 700r4
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
Last edited by gasmonkey; 07-01-2009 at 07:57 PM. Reason: codes
07-01-2009, 06:59 PM
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Re: 91 Z28. codes? 33, 44,45, and 46?? TPI
https://www.thirdgen.org/service-eng...ht-error-codes
The best book for troubleshooting is the Helm FSM.
RBob.
The best book for troubleshooting is the Helm FSM.
RBob.
07-02-2009, 01:59 AM
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Car: 1992 z28
Engine: 5.7 350
Transmission: 700r4
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???
07-02-2009, 08:43 AM
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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).
RBob.
RBob.
07-02-2009, 11:48 AM
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Car: 1992 z28
Engine: 5.7 350
Transmission: 700r4
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?
07-02-2009, 02:00 PM
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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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07-02-2009, 04:41 PM
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Car: 1992 z28
Engine: 5.7 350
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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.
07-03-2009, 01:07 PM
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Car: 1995 K2500
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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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