I have a 96 mistubishi 3000GT that misfires and.

Tiny
JEREME. L
  • MEMBER
  • 1996 MITSUBISHI 3000GT
  • 148,000 MILES
I have a 96 mistubishi 3000gt that misfires and backfires, it started with a hesitation and then It developed a miss on cylinder 2 I replaced the sparkplugs and wires that didn't solve it so I swaped the injector and ran a compression test, all cylinders are in spec, flushed the oil, replaced fuel filter, and checked the coil and its still good, so I have compression fuel and spark but cylinder 2 is still dead can anyone help me? And my fuel trim is +12% on both banks
Monday, October 22nd, 2012 AT 11:30 PM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I have compression fuel and spark but cylinder 2 is still dead-Compression readings are they all within 10 from highest-I'm thinking burned exhaust valve at no.2-

You might want to inspect/test the camshaft/crankshaft position sensors and wiring back to the computer

Camshaft Position Sensor (SOHC) (1996 ) Inside distributor assembly.
Crankshaft Position Sensor (DOHC )On vibration damper.
Crankshaft Position Sensor (SOHC) (1996)On vibration damper
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Tuesday, October 23rd, 2012 AT 12:09 AM
Tiny
JEREME. L
  • MEMBER
  • 3 POSTS
The valves do have some more carbon buildup then the rest of them, how do u test the crank sensor I have the DOHC 3.0 non-turbo, and what are the little port holes in the lower intake runner tubes all have a clean spot around this little port except cylinder 2?
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Tuesday, October 23rd, 2012 AT 1:10 AM
Tiny
RASMATAZ
  • MECHANIC
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Inspect/Test no.2 cylinder injector solenoid resistance
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Tuesday, October 23rd, 2012 AT 2:02 AM
Tiny
JEREME. L
  • MEMBER
  • 3 POSTS
Tested the injector all have 15 Ohms of resistance. Spec is 15-17 Ohms and also just checked timing and it's still In time
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Tuesday, October 23rd, 2012 AT 2:58 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What are the little port holes in the lower intake runner tubes all have a clean spot around this little port except cylinder 2- investigate why? And also inspect the CPS
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Tuesday, October 23rd, 2012 AT 3:41 AM

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