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Can anyone explain this?

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Old May 5, 2012 | 12:05 PM
  #1  
Nate_iroc88's Avatar
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Car: 1988 Camaro IROC-Z
Engine: 350 TPI
Transmission: 700R4
Axle/Gears: 2.77
Can anyone explain this?

Alright, brief overview if whats going on.

Everyday I get a code 33. Sometimes the SES lights and car still runs, just not 100%. Others there is a noticeable loss of power, timing locks, engine gets hot etc...
Turn if off and wait about 5 mins and she fires right back up like thing is wrong.

Ok, the crazy thing I can't explain- Friday night I drove about 5 miles to go and get some food. It was pretty hot out so I hit the A/C. No problems. No SES light, no rough idle, didn't over heat, ran perfect! So after eating I was curious and took her out for a longer drive. Drove about 10 miles and still running perfect with A/C on. So I stomped into it. At about 4000-4500 rpm I could feel a decent power loss and the SES light came back on. I let off the gas and she was running horrible again. Pulled over, turned the car off and let it sit for a couple mins. Started it back up and turned A/C off. SES light came back on, wasn't running perfect, but what I consider to be an average day for her.

Can anyone explain why the A/C being on would cause the car to actually run better?

Only thing I can figure is the engine has to spin faster to run the compressor. The code 33 is to much air entering based on engine speed and TPS position. So could the A/C offset the code parameters? And why would it reappear high in the rpm range?
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Old May 18, 2012 | 01:44 PM
  #2  
NY87Iroc's Avatar
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From: Scotia New york
Car: 1987 Iroc convertible
Transmission: 700r4
Axle/Gears: 3.42 posi
Re: Can anyone explain this?

ttt, I am having same issues just not with the ac on.
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Old May 18, 2012 | 02:02 PM
  #3  
Tom 400 CFI's Avatar
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Car: '92 Corvette, '89 1/2-a-'Vette
Engine: LT1, L400
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Axle/Gears: 3.45, 3.31
Re: Can anyone explain this?

Originally Posted by Nate_iroc88
Can anyone explain why the A/C being on would cause the car to actually run better?

Only thing I can figure is the engine has to spin faster to run the compressor. The code 33 is to much air entering based on engine speed and TPS position. So could the A/C offset the code parameters? And why would it reappear high in the rpm range?
At this point we can't make the claim that the A/C has any affect on the symptom; ONE semi-weak correlation is not proof. Run the test 10 times, and post the results.

Engine doesn't have to spin faster to run the compressor. Engine SHOULD run at the same speed. If anything, AC on would increase the flow of air into the engine; opening of the IAC.

No matter though; diagnose the code 33, repair it and move on.
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