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98 eldorado pcm sensor issue

1K views 2 replies 2 participants last post by  98eldorado313 
#1 ·
I have a 1998 eldorado and after changing my exhaust to pass emissions these codes started coming on and off randomly i have changed the parts for the codes
But still have them come up im starting to think it may be my pcm any input?

DTC P0171 Fuel Trim System Lean Bank 1

DTC P0174 Fuel Trim System Lean Bank 2

DTC P0503 Vehicle Speed Sensor (VSS) Circuit Intermittent

DTC P1377 IC Cam Pulse To 4X Reference Pulse
 
#2 ·
i have changed the parts for the codes
what parts have you changed -

P0171 and P0174 are due to a big vacuum leak -
get a can of carb/throttle body cleaner -
spray around the engine while running -
when the idle changes - you found a leak -

pay particular attention around the elbows of the PCV hoses -

P0503 is probably a bad plug/loose connection or frayed wire -

P1377 is probably a bad cam sensor -
 
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