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1993 Toyota Tercel engine miss

Tiny
TBIRD
  • MEMBER
  • 1993 TOYOTA TERCEL
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 72,000 MILES
I have a 93 Toyota Tercel, I replaced cap, rotor, plugs and wires but No.4 cylinder still misses. The plug at No.4 was black others were white, could it be the injector or timing belt as someone told me?
Wednesday, January 9th, 2008 AT 1:34 AM

1 Reply

Tiny
MHPAUTOS
  • MECHANIC
  • 31,937 POSTS
HI there,

The black is unburnt fuel, three reasons, poor spark, excessive fuel, low compression. You can have the ignition system tested on a oscilloscope, a compression testis a quick check, and the injector would be a suspect if the other two were ok. See how you get on.

Mark (mhpautos)
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Wednesday, January 9th, 2008 AT 1:51 AM

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