Question about Code33
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Joined: Oct 2003
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Question about Code33
Hey guys.....I really could use some help.....
Here is what I have:
91z28
305 tpi
Here is the problem:
I will start from the begining....My air pump froze up, so being in a state that has no emissions I removed the a.i.r system, which was no big deal the car ran great until about a week afterward....it starting running extremely rich.....I replaced the spark plugs, wiries, cap, rotor, and still no change. About 4 days after that I finally broke down and pulled the codes from the ecm... the only code pulling up was code33.....I quickly jumped onto the best tech board out in cyberspace(HERE LOL) and did some research and from what I gathered it basically comes down to the MAF and EGR....which I have now replaced...Unfortuneatly the problem has got worse.....Now it will start up (with a very rough idle) and anytime I try to punch it completely falls on its face......I have to turn off the car and restart it and gradually give it gas to make it come up to revs.....I have gone through 3 cans of brake cleaner trying to find a vaccum leak and I have also tested and visual checked all the injectors to come up with a big
.....
Just to make sure Im reading the code right it is flashing 12 three times then it will flash 33 three times....then repeat the sequence 12 three times and 33 three times.....
Does anybody think that it could be a bad ecm.....or does anybody have any ideas....Its to the point of me thinking of 5 gallons of gasoline and a match is my best solution LOL...
Anyway thanks for any input
Here is what I have:
91z28
305 tpi
Here is the problem:
I will start from the begining....My air pump froze up, so being in a state that has no emissions I removed the a.i.r system, which was no big deal the car ran great until about a week afterward....it starting running extremely rich.....I replaced the spark plugs, wiries, cap, rotor, and still no change. About 4 days after that I finally broke down and pulled the codes from the ecm... the only code pulling up was code33.....I quickly jumped onto the best tech board out in cyberspace(HERE LOL) and did some research and from what I gathered it basically comes down to the MAF and EGR....which I have now replaced...Unfortuneatly the problem has got worse.....Now it will start up (with a very rough idle) and anytime I try to punch it completely falls on its face......I have to turn off the car and restart it and gradually give it gas to make it come up to revs.....I have gone through 3 cans of brake cleaner trying to find a vaccum leak and I have also tested and visual checked all the injectors to come up with a big
.....Just to make sure Im reading the code right it is flashing 12 three times then it will flash 33 three times....then repeat the sequence 12 three times and 33 three times.....
Does anybody think that it could be a bad ecm.....or does anybody have any ideas....Its to the point of me thinking of 5 gallons of gasoline and a match is my best solution LOL...
Anyway thanks for any input
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Joined: Sep 2003
Posts: 6,127
Likes: 12
From: conway, s.c.
Car: 1989 Iroc-Z
Engine: 5.7L TPI
Transmission: 700R4
If you will do a 
of the board you will find the code 33 trouble charts that I have posted on here. While reading it you will see that the code 33 can also be caused by the TPS and one of the checks is to test the fuel pump. BTW, on your car you have the MAP system and not the MAF.
of the board you will find the code 33 trouble charts that I have posted on here. While reading it you will see that the code 33 can also be caused by the TPS and one of the checks is to test the fuel pump. BTW, on your car you have the MAP system and not the MAF. 
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