I need help code 33 comes up but it not map senser cause i changed it

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I have changed about all the sensers, code 33 comes up and i have changed the map senser checked the converter. It seems to run good wen i put it to the floor but if not it chugges and runs bad. the check engine light goes off wen its full throtle, any ideas?

bigredsuperduty in Lafayette IN

Jan 12, 2010

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RepairPal Certified shops can diagnose and repair your 1991 Pontiac Grand Prix. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.

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I need help code 33 comes up but it not map senser cause i changed it

What is your question?

bigredsuperduty in Lafayette IN

Jan 12, 2010

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Bret Bodason Jan 12, 2010

Check the vacuum hoses from the MAP sensor. Check the electrical connections at the ECM. How is the vacuum signal to the MAP sensor? How is the signal from the MAP sensor at the ECM? Is it within the spec from GM?

bigredsuperdutyon Jan 13, 2010

I checked the vacum to the map senser it has good vacum, what is the signal supposed to be?

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Popular Answer

What are the best Pontiac repair shops?

RepairPal Certified shops can diagnose and repair your 1991 Pontiac Grand Prix. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.