Trstrugar
OBS Enthusiast
My truck is a 1994 k1500 with a 5.7l. I am throwing a code for a 33, map sensor voltage high. I tried replacing it, but it made no difference. The truck starts up rough and sputters for about 10 seconds, then it appears to run fine. When I unplugged the sensor it would start up fine, but run extremely rich. I have true dual exhaust and headers, and was running into o2 sensor issues, but after I re wired the IAC valve all the codes I was throwing went away except for map sensor. If anyone can shed some light on this and explain to me what the sensor actually is supposed to do I would appreciate it. TYIA!