CHEVY MAP SENSOR

1994 Chevrolet S-10

Tiny

jmichael8888

December, 3, 2008 AT 9:07 PM

Engine Performance problem
1994 Chevy S-10 6 cyl Two Wheel Drive Automatic 165000 miles

my truck is a CMFI fuel system. I got this truck from my brother and it has always run poorly (low power). My question is would a map sensor vlotage reading of 3.8v at idle be causing my computer to think it has low vacuum?Or be causing it to run weak. A vacuum test shows a steady 18.5psi acceleration test normal.

FOUND 656 RELATED QUESTIONS

1 Answer

Tiny

racefan966

December, 3, 2008 AT 9:47 PM

Ok the voltage for map sensor should be 1 to 2 volts at idle and at wide open throttle it should be 4 to 4.8 volts. So if it is showing 3.8 volts at idle then it would think it is at wide open throttle and give more fuel which would give you poor mileage and poor performance.

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