C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1988 350 code 33 MAF senser

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Old Jul 17, 2009 | 08:46 PM
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Default 1988 350 code 33 MAF senser

I have an 88 350 that has been popping up with code 33. It runs fine in the morning, but when it sits out in the sun, and I go to drive it, the check engine light comes on and it runs like quap. Any ideas of what could be heating up from the sun to make it come up to show MAF? If I shut the car off for 30 seconds and start it back up, the light goes out and runs ok for a while. Thankyou
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Old Jul 17, 2009 | 08:59 PM
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I do not know about the sun thing but I have had MAF codes 2 times in 140k miles. Both times I replaced the relays and fixed the problem.
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Old Jul 18, 2009 | 08:22 PM
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I gave it a tuneup, plugs wires, cap and rotor, air filter, and I did change the two relays. Didn"t help. I also cleaned the MAF senser. Changed the oil and filter, and checked vacuum lines. It doesn"t do it all the time, but is getting more frequent. Could the TPS possibly cause this and have a code going to MAF?
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Old Jul 18, 2009 | 08:57 PM
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http://members.shaw.ca/corvette86/Code%2033.pdf
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Old Jul 19, 2009 | 03:36 AM
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Eckler's & all the other Corvette parts houses have these relays for about $18. http://www.ecklers.com/search.asp?ac...searchHistory=
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Old Jul 20, 2009 | 08:01 PM
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Default MAF senser 1988 350

Does anyone have a good used MAF senser for sale? Still not sure if this is the problem. I have to check deeper into testing wiring and voltages.
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Old Jul 20, 2009 | 09:24 PM
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Default Code 33

Jerry, go to http://corvettebuyers.com/c4vettes/ecm.htm

Check the relays with a digital ohm meter. "Replace if less than 18 Ohms."

Hope that's all you got. I got a 36, 42 and 43.

DM
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