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Injector wiring fault



  pb ph2 172
[h=2]Right I recently had a misfire occur on which the diag showed up that injector on cyl 2 was open circuit / short positive earth also said cylinders spark plug was black with soot[/h]
ive tried new injector , plugs , leads , coil pack then even swapped the injector with cylinder 1
Problem was still there
ive now set about stripping back the wiring loom but so far can't see any breaks
however with the loom all pulled apart the car appears to run perfect
when I first had the problem it was idling rough
but when I changed all the parts it idled perfect and only missfired under load / under acceleration but not at say 50mph cruising
after fiddling with wires it's perfect
has anyone else had this problem before​
 

Fishfire

ClioSport Club Member
  Clio 172
[h=2]Right I recently had a misfire occur on which the diag showed up that injector on cyl 2 was open circuit / short positive earth also said cylinders spark plug was black with soot[/h]
ive tried new injector , plugs , leads , coil pack then even swapped the injector with cylinder 1​
Problem was still there​
ive now set about stripping back the wiring loom but so far can't see any breaks​
however with the loom all pulled apart the car appears to run perfect​
when I first had the problem it was idling rough​
but when I changed all the parts it idled perfect and only missfired under load / under acceleration but not at say 50mph cruising​
after fiddling with wires it's perfect​
has anyone else had this problem before​
Yes.....this week, and this perfectly describes everything thats happening to me, including the black spark plug but on no.3 on mine.
Only after unplugging injector no.3 and fetling with the wire did it run OK.

I changed coilpack, ht leads, sparks and swapped out no.3 injector with a spare I had from another engine.

Tested it this evening, all working fine then decided to run lime a bag of spanners, then fine again etc etc.

Check engine light flashes away, but no fault codes stored?

Wiggled the wires on the injectors and instantly ran perfectly.

Stripping back the wires it is then 😒
 


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