Quoted: Code 33 on a 1990 Century. This is a MAP sensor voltage too high. Only problem is, the 1990 doesnt have a MAP sensor!!!! WTF?!? Car runs fine cold, but when it is warmed up it clunks out every single time! Would be consistent with a MAP sensor, only problem is I cannot find it and every parts store that I called asking for a MAP sensor say they dont show this model having one! HELP!
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Code 33 on a '90 Century is actually for the MAF(Mass Airflow). It refers to excessive flow. On models with a MAP sensor the same code is used, thus the confusion.
There are two things that you should consider, first make sure you don't use any performance filters that use oil, they damage the MAF unit.
Second, if you want to verify that the MAF is bad without going through component testing you take a screwdriver and rap the MAF unit(not too hard) while someone cranks. If it starts, go get a new MAF, ASAP!
Component testing will follow, if you need it just ask.