zeke573

I have a 1991 Corolla with a 1.6 motor(6 vin code). The car is showing error codes 25,26.31 Codes 25 and 26 are for opposite conditions(lean and rich). Anyway as part of testing,I unplugged the MAP sensor and the car died immediately. The car should still run with the sensor unplugged,so I'm not sure what this means. Something else has to be malfunctioning to cause it to die. TPS,ECM,low vacuum? Vacuum reads 18-19 range. Should be ok.The car has been running rough at idle and the check engine light has been on for a while,so I decided to try and isolate the problem.
When getting the codes from the flashing check engine light.... I've read it will flash three times in a row for each code-then go to the next code. Mine did not do this. It flashed 25 pause 26 pause 31 pause 25 pause 26 pause 31...and so on. NOT 25 pause 25 pause 25 pause 26 pause 26 pause 26 pause 31 pause 31 pause 31 and so on. I point this out in case this could be a problem with the ecm. Thanks for any help

jdmccright

Check for a stuck or clogged EGR valve, PCV valve, and/or IAC valve. Any or all of these can contribute to rough idling, stalling, and poor performance. Good luck!

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Current Garage:
2003 Pontiac Vibe 1.8L AWD
2003 GMC Envoy XL (aka "fat-a$$") - K&N air filter, otherwise stock.
1995 Chevrolet C2500 2wd, 5.7L - K&N air filter, otherwise stock...my weekend hauler.
1992 Toyota Camry LE 2.2L - K&N air filter.

Vehicle History:
2004 4.7L Dakota Quad Cab 4x4
1996 GMC Jimmy 4wd
1992 Chevrolet S10 Ext. Cab 4.3L
1995 Honda ST1100...my first (and only) new vehicle.
1980 Yamaha XS400
1980 Mercury Bobcat...my first car.