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Doug
Doug, ASE Certified Technician
Category: Car
Satisfied Customers: 8538
Experience:  16 years automotive and OTR repair including specialized training from Toyota and Mitsubishi
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1999 mitsubishi galant: shaft belts, new coils..No check engine

Resolved Question:

1999 mitsubishi galant 2.4 4cyl no fire on #1and #4 cyl. Has new crank and cam sensors, new timing and balancer shaft belts, new coils and plugwires.Car starts but only runs on #2 and #3 cyl.No check engine on.Please help before I set this #$^##@#$^&$ on FIRE.
Submitted: 7 years ago.
Category: Car
Expert:  Doug replied 7 years ago.
Hi,
Knowing that one coil is firing fine, you can eliminate the cam and crank position sensors.
Having new coils, we can assume the coils are good as well.

You will need a digital multimeter to proceed.
Inspect coil conectors for corrosion.
At the coil connectors, you should have 12v at pin 1 (black/red wire), ground at pin 2 (black wire), and pulsing ground while cranking at pin 3 (black/blue on one coil and white/green wire on other coil)

If you have this at both coils, verify your non-firing coil is delivering spark.
If you do NOT have this at both coils, you need to test for pulse at the PCM output.
Check for ground pulse at PCM pin 12 (white/green wire) and pin 11 (black/blue wire).
The PCM is located on the firewall on the passenger side, behind the ac work.

If you DO have pulse during crank at both pins, you have a break in the wiring between the PCM and the coils.
If you do NOT have pulse on one pin, your power transistor inside the PCM has failed, and will need rebuild/replacement.
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