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SES codes 33 and 44??

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Old Feb 6, 2020 | 04:48 PM
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My86's Avatar
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Car: 1986 IROC-Z28
SES codes 33 and 44??

Hey guys,
I have an '86 IROC and the service engine light is on. I check the codes and I get 33 and 44. It starts with 12, then 33, 44, then back to 12. 12 is just telling me its in diagnostic mode, right? Anyone know what 33 and 44 are? I just got the car last weekend and it was coming on and going off as I drove it. I took off the mass air inlet and the EGR valve and sprayed cleaner in both last nite and let them sit. Start it up tonite and light is still there so checked the codes and saw 33 and 44. Any help would be greatly appreciated.
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Old Feb 6, 2020 | 06:13 PM
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Re: SES codes 33 and 44??

Tpi ?

http://www.chevythunder.com/maf_code_33.htm

http://www.chevythunder.com/o2_sensor_code_44.htm




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Old Feb 6, 2020 | 06:28 PM
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Car: 1986 IROC-Z28
Re: SES codes 33 and 44??

Yes. It is the 5.0 TPI.
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