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2001 Isuzu Rodeo Question # 4 spark plug miss firering

Tiny
TAMERA WILLIAMS
  • MEMBER
  • 2001 ISUZU RODEO
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 90,400 MILES
I changed the spark plugs on my rodeo. While taking them out I wrote down the firering order, it was 1423. In the hanes manual it said the order was 1342. When I put it back together I put it back the way it was 1423. It ran ok for about 3 days, then I started to run rough so I put e plugs in the way the book said. That made it worse. My number 4 plug is miss firering and it looks dark when I pull it out. Do you know what might be causing this?
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Saturday, August 2nd, 2008 AT 7:14 PM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
Can be a bad plug wire, bad fuel injector, or low engine compression. Start by testing the wire, then listen to the injectors, do they all click? Use a test light at the injector harness, see if they are firing. Last resort is the compression test.
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Saturday, August 2nd, 2008 AT 8:20 PM

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