Tech Support Forum - View Single Post - [SOLVED] 95 Chevy S-10 4.3L TBI

dgoad · 09-03-2007, 07:00 PM

Hello MT,
Not giving up here, I have more info. I placed the scan tool back on and noticed that the MAP is now generating a high voltage error code. I looked at the realtime running value of the MAP output and I was getting about 4.x volts at the rough idle point and as I ran the engine up I was able to get the voltage to about 2.2 volts or so. The voltage is moving through the RPM range, however, my manual states that the voltage should be around 1.6v at idle and increase to around 4.x volts at full throttle. This is opposite of what I am getting. In a way though, it makes a little sense. If the CPU is being told my the MAP that at idle I am asking for full RPM fuel and at full RPM it is asking for idle fuel. Strange, I wonder is the MAP sensor can do this. I have not changed this part, yet!
More to come, I'm sure or that.
P.S. I did see the coolant temp in the scan tool and it was reporting correct and it was moving hotter as I ran the truck.
Thanks.

09-03-2007, 07:00 PM	#7 (permalink)
dgoad Registered User Join Date: Sep 2007 Posts: 10 OS: wVista	Re: 95 Chevy S-10 4.3L TBI - Idle troubles Hello MT, Not giving up here, I have more info. I placed the scan tool back on and noticed that the MAP is now generating a high voltage error code. I looked at the realtime running value of the MAP output and I was getting about 4.x volts at the rough idle point and as I ran the engine up I was able to get the voltage to about 2.2 volts or so. The voltage is moving through the RPM range, however, my manual states that the voltage should be around 1.6v at idle and increase to around 4.x volts at full throttle. This is opposite of what I am getting. In a way though, it makes a little sense. If the CPU is being told my the MAP that at idle I am asking for full RPM fuel and at full RPM it is asking for idle fuel. Strange, I wonder is the MAP sensor can do this. I have not changed this part, yet! More to come, I'm sure or that. P.S. I did see the coolant temp in the scan tool and it was reporting correct and it was moving hotter as I ran the truck. Thanks. Last edited by dgoad; 09-03-2007 at 07:02 PM.