Question about 1994 Chevrolet C/K 2500

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I have a 1994 chevy work truck with a 305. I have trouble codes # 15, 22, 33, 34, 44, and 53. The egr valve had been removed but apeared good. Someone had put a plate over the port. Additionaly someone removed the map sensor

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DTC - 15 Engine coolant temp sensor error (low temp indicated)
DTC - 22 Throttle position sensor error (signal low)
DTC - 33 MAP sensor circuit error (signal high indicating low vacuum)
DTC - 34 MAP sensor circuit error (signal low indicating high vacuum)
DTC - 44 Oxygen sensor error (lean condition indicated)
DTC - 53 Digital EGR Valve solenoid 1 error

MAP is short for manifold absolute pressure sensor,,it senses the manifold pressure and applies the right amount of gas with the right amount of ignition timing so the car runs and performs well if this does not work properly,it throws off the whole loop cycle for the computer,,which in turn makes it run badly,,and get poor fuel economy,,it causes one to have a lack of power,,combined with a loss of fuel economy,,and also poor take offs,,and sometimes an occasional stalling,,i hope this helps.

EGR system was really developed for was emissions control. the purpose of the EGR valve is to regulate the amount of exhaust gas recirculated back into your combustion chamber to send the gasses through another cycle in order to eliminate any excess pollutants like NOX (nitrogen oxides), N2 (nitrogen), O2 (oxygen), CO2(carbon dioxide) and HC (Hydrocarbons). the EGR was also developed to lower combustion temps that's another reason why the exhaust is recirculated the exhaust gasses will not burn therefor lowering combustion temps, because there is less "usable" air going into the cylinders.

Posted on Nov 17, 2009

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You should get a working egr back on the truck and you'll also need a map sensor for this vehicle to run correctly.

Posted on Nov 17, 2009

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Egr fault code p0401


Hi there:

In fixing this code, it is quite common for people to just replace the EGR valve only to have the OBD code return. The EGR valve is not always the culprit.

  • Use a vacuum pump and pull the EGR valve open while monitoring engine RPM's & DPFE voltage. There should be a noticable difference in RPM's with the EGR open
  • Clean out the EGR valve and/or tubing to remove deposits
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  • Replace the DPFE sensor (with a good quality / OEM one)
  • Replace the EGR valve


Hope this helps.

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When the egr valve is bad on a 1992 honda accord wagon what happens?


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  3. with engine running at idle
  4. on the underside of the valve you can access the diaphram.
  5. wearing glove if ness
  6. lift diaphram while idling
  7. does engine stall or run very rough?
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  9. start engine
  10. you should hear a very large vaccum leak and exhaust noise
  11. if either are missing investigate cause
  12. if ok reassemble.
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  15. inspect hose to sensor for damage
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  17. 9ecffd7.gif

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