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1998 chev.s-10 2.2 lt ....what should the p.s.i. be on the fuel pump ? stalls at stops..lights...jerks & & on at it the pump ?

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SOURCE: 1998 chev.s-10 2.2 lt codes #

Hi, you may have 2 separate problems here. 107 indicates the MAP sensor, and that may be also causing the 172 code. The other codes indicate the EGR valve position sensor, which is integral to the valve itself. I would test both of these before replacing (the EGR valve is about $150 and the MAP sensor about $60-70). First check the connectors on them for any corrosion or poor connection. The MAP sensor is mounted to the top of the intake manifold. The EGR valve is at the back of the engine near the brake booster. Please let me know if you have any questions, and thanks for using FixYa.

See Figures 1, 2 and 3 jturcotte_1442.gif

Fig. Fig. 1: Typical Manifold Absolute Pressure (MAP) sensor wiring diagram (wire color, terminal identification/location may vary on certain models)

  1. Backprobe with a high impedance voltmeter at MAP sensor terminals A and C .
  2. With the key ON and engine off, the voltmeter reading should be approximately 5.0 volts.
  3. If the voltage is not as specified, either the wiring to the MAP sensor or the VCM may be faulty. Correct any wiring or VCM faults before continuing test.
  4. Backprobe with the high impedance voltmeter at MAP sensor terminals B and A .
  5. Verify that the sensor voltage is approximately 0.5 volts with the engine not running (at sea level).
  6. Record MAP sensor voltage with the key ON and engine off.
  7. Start the vehicle.
  8. Verify that the sensor voltage is greater than 1.5 volts (above the recorded reading) at idle.
  9. Verify that the sensor voltage increases to approximately 4.5. volts (above the recorded reading) at Wide Open Throttle (WOT).
  10. If the sensor voltage is as specified, the sensor is functioning properly.
  11. If the sensor voltage is not as specified, check the sensor and the sensor vacuum source for a leak or a restriction. If no leaks or restrictions are found, the sensor may be defective and should be replaced.


Fig. Fig. 2: Using jumper wires and a high impedance voltmeter test between MAP sensor terminals A and C with the key ON and engine off. The voltage should be approximately 5 volts


Fig. Fig. 3: Next test between MAP sensor terminals A and B with the key ON and engine off. The voltage should be approximately 0.5 volts

EGR test: requires a GM scan tool:


EGR replacement:

Linear EGR Valve

  1. Disconnect the negative battery cable.

Note the position of the EGR valve prior to removal. Do not rotate the valve 180?.
  1. Unplug the valve electrical connection..
  2. Unfasten the valve retainers, then remove the valve and the gasket.

To install:

  1. Clean all gasket residue from the gasket mating surfaces.
  2. Install a new gasket and the valve.
  3. Install the valve retainers.
  4. On 1998-99 2.2L models, tighten the retainers to 19 ft. lbs. (26 Nm).
  5. Attach the valve electrical connections and connect the negative battery cable.

Component locations:


EGR valve wiring:

EGR valve pic;


MAP sensor pic:


Posted on Apr 03, 2011


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