1991 Chevrolet S10 Q&A
1991 Chevrolet S10 Question: won't stay running
MAP and TPS sensors share the same 5 volt reference signal from the computer (ECM) , have you checked for voltage at these sensors with the key on engine off sensor connection disconnected from the sensor 5 volt should be present at one wire at each sensor or you must trace the wire back to the computer and see if it is a wiring problem , computer problem or power/ ground issue. For test procedures there is a company that independent auto repair shops "buy" their information from that offer a very reasonable service to do it yourselvers. You can get a one week subrcription or year subscription very cheap. The information is year make and model specific repair procedures, service bulletins, component locations, wiring diagrams ect.... great quality information same as the professionals have ,much better than generic workshop manuals from parts stores, much cheaper than the factory manual try http://bit.ly/mitchell_repair_manuals_online and get an online repair manual subscription. - patrick mannion
When I crank engine...I noticed if the running lights turn off truck won't start...if they stay on it will fire up and stay running.....but only after I heat the cab up....I'm stumped!!!