IDLES ROUGH SOMETIMES EVEN SURGES NEW LONG BLOCK

  • Tiny
  • JSRoeth
  • 1993 Ford F-150
  • 1,000 miles

Have diagnosed emission system Christian brothers says everything ok
New exhaust system
New fuel pump, selector switch, and float sending unit
Compression test both types example 150/60
New air charge temp sensor
New HEGOS sensor
New idle air control valve
I get DTC code DTC42 and DTC77 when performing KOER test with ODB1 tester
DTC42 says voltage is high

Friday, March 9th, 2012 AT 2:02 AM

1 Answer

  • Tiny
  • rasmataz
  • Member

DTC - 42 Ignition bypass circuit error-also go this links: http://www.2carpros.com/articles/engine-misfires-or-runs-rough

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Friday, March 9th, 2012 AT 2:33 AM

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