probable cause on a 1992 buick code 26 and 42 show up can some one help me please code 26 is .... Quad Driver (QDM) "A" Fault code 42 is ..... Electronic Spark Timing (EST) Circuit
buick 92 code 26 code 26 is .... Quad Driver Module (QDM A) error
...1992 Buick Regal.While driving the cel turns on at 2000 rpm and turns off at 900 rpm.Also the cel turns off while parked and engaged in drive.Please advise as to the most likely cause.Thanks. The ...
...1992 Buick Regal 3800 or about 15000 miles.It passed an emissions test in 2014 with the check engine light going on and off depending on the engine speed.The car runs great including a 4000 mile ...
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