View Single Post
Old 08-05-2017, 11:43 PM   #3
edhtrd71
Registered User
 
Join Date: Jan 2011
Location: Edinburg, Texas.
Posts: 194
Re: 91 Silverado TBI problems

Hey, it sounds like its running really rich, which you probably already know. Definitely can be the o2 sensor or map sensor. It could also be the coolant temp sensor also. Quick checks you can make are checking the connections and related wiring to those sensors. Make sure the map sensor vacuum hose running from the throttle body isn't cracked and leaking. After that I would invest in a data reader so you can see what the sensors are doing. Also I have seen ignition modules cause funky drive ability issues on those. Good luck.
edhtrd71 is offline   Reply With Quote