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73-87 Chevy _ GMC Trucks => Fuel Systems and Drivability => Topic started by: Tazman on July 28, 2016, 09:14:28 pm

Title: Code 33
Post by: Tazman on July 28, 2016, 09:14:28 pm

Last week when coming from work the engine light came on. So I checked it and it was a code 33,so knowing my map sensor was under complete warranty I changed it hoping that would fix it. It did, for a couple days or so. Any way it is back so I will do a better check of things. I am wondering as I read my 87 service manual. What do they mean when stating "scan"?

Thanks 

Title: Re: Code 33
Post by: LTZ C20 on July 28, 2016, 10:01:30 pm

Do you have access to a scan tool of any type.

Title: Re: Code 33
Post by: Irish_Alley on July 29, 2016, 07:19:48 am

Obd1 code retrieval and decoding (http://forum.73-87chevytrucks.com/smforum/index.php?topic=29949.0)

Title: Re: Code 33
Post by: Tazman on July 29, 2016, 06:31:48 pm

All I have is the OBD1 I have had for years. It gives me the codes but that is all.

Title: Re: Code 33
Post by: Irish_Alley on July 30, 2016, 07:08:09 am

hows this (http://forum.73-87chevytrucks.com/smforum/index.php?topic=29996.0) help?

Title: Re: Code 33
Post by: bd on July 30, 2016, 10:52:11 am

Make sure there is unrestricted manifold vacuum reaching the MAP sensor and that there are no vacuum leaks.

Title: Re: Code 33
Post by: Tazman on July 30, 2016, 12:35:16 pm

hows this help?

Yes it does, I will check this as soon as I can.

Thanks !!