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1992 Camaro Z28 Engine Problem
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Bradley45
Novice
Mar 10, 2017, 4:47 AM
Post #1 of 13
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1992 Camaro Z28 Engine Problem
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Its the tune port injection motor (tpi). The car runs fine at first, but when I first crank it up it idles up and down by itself. Then when the motor warms up when I'm driving it, and I'm wanting to accelerate, it starts bogging and the rpm's bounce up and down and the car don't want to go. It idles up and down by itself no matter what, but like I said. It only does the other thing when the car warms up. Just replaced the tps sensor, new plugs and wires. But it didn't help.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 10, 2017, 5:43 AM
Post #2 of 13
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Re: 1992 Camaro Z28 Engine Problem
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Have you checked for any stored codes?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bradley45
Novice
Mar 10, 2017, 6:28 AM
Post #3 of 13
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Re: 1992 Camaro Z28 Engine Problem
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How do I do that? The service engine soon light comes on and goes off from time to time.
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Hammer Time
Ultimate Carjunky
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Mar 10, 2017, 7:06 AM
Post #4 of 13
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Re: 1992 Camaro Z28 Engine Problem
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You can either have them read by a shop that has an OBD1 scan tool or you can read the flash codes by jumping terminals A & B of the diagnostic connector and turning the key on.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bradley45
Novice
Mar 10, 2017, 7:09 AM
Post #5 of 13
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Re: 1992 Camaro Z28 Engine Problem
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Okay I did that with a paper clip. Gave me the code 22. Which says tps sensor voltage low. I just replaced it. So could it be the harness that it plugs into? And would that be giving me all this trouble?
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Hammer Time
Ultimate Carjunky
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Mar 10, 2017, 7:12 AM
Post #6 of 13
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Re: 1992 Camaro Z28 Engine Problem
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Yes, it could be anything associated with the TPS circuit to include the sensor, all related wiring, the ECM or mechanical issues with the throttle body.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bradley45
Novice
Mar 10, 2017, 7:14 AM
Post #7 of 13
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Re: 1992 Camaro Z28 Engine Problem
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Do you recommend replacing the harness first?
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Hammer Time
Ultimate Carjunky
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Mar 10, 2017, 7:58 AM
Post #8 of 13
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Re: 1992 Camaro Z28 Engine Problem
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We don't arbitrarily replace parts we haven't tested.
We systematically test the circuit until the issue is found. You can monitor the TPS voltage with a scan tool or DVOM but you need to understand how the circuit works to do that.
I can get you a wiring diagram for the TPS but I first need the 8th digit of you VIN#.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bradley45
Novice
Mar 10, 2017, 8:04 AM
Post #9 of 13
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Re: 1992 Camaro Z28 Engine Problem
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8th digit is F
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Hammer Time
Ultimate Carjunky
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Mar 10, 2017, 8:09 AM
Post #10 of 13
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Re: 1992 Camaro Z28 Engine Problem
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bradley45
Novice
Mar 10, 2017, 8:20 AM
Post #11 of 13
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Re: 1992 Camaro Z28 Engine Problem
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How do you test it?
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Hammer Time
Ultimate Carjunky
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Mar 10, 2017, 8:25 AM
Post #12 of 13
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Re: 1992 Camaro Z28 Engine Problem
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There is only so much info you can get in a forum. If you don't understand the system, then you need to have someone do this for you. All I can do is supply the needed tools.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Bradley45
Novice
Mar 10, 2017, 8:36 AM
Post #13 of 13
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Re: 1992 Camaro Z28 Engine Problem
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Thanks for all the info man!
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