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Gary, Technician
Category: Car
Satisfied Customers: 16862
Experience:  GM master tech for 15 years/ASE master tech for 20 years
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isuzu trooper: I have a 94 isuzu trooper. Its only running

Customer Question

I have a 94 isuzu trooper. It's only running on 4 cylinders. 6&3 not firing. They both are connected to my center coil. First time it happened I switched out 2 coils and it seemed to fix problem. Until yesterday. It happened again. Same cylinders. This time I replaced the coil and nothing changed. Still no spark to 6&3.
Submitted: 3 years ago.
Category: Car
Expert:  Gary replied 3 years ago.
Welcome! My name is XXXXX XXXXX I will do my best to assist you with this problem.
so with a new 3/6 coil BOTH those coil towers show no spark out of them when cranking or the engine running ?
is this correct ?
Customer: replied 3 years ago.

This is correct. Engine runs. But no spark from 3&6

Expert:  Gary replied 3 years ago.
ok the problem is going to be the ignition module that the 3 coils sit on
usually a bad coil will damage the ignition module and cause this problem
since its only 3 / 6 replacing the ignition module should correct you no spark problem to those 2 cylinders
Customer: replied 3 years ago.

Where is module located?


Expert:  Gary replied 3 years ago.
right under the 3 coils
it looks like this
Customer: replied 3 years ago.

How difficult is it to replace? And is it a expensive part?

Expert:  Gary replied 3 years ago.
its @ $ 80 to $ 100
and very easy to change if you changed a coil you did the hard part
you disconnect the electrical connectors to the module then remove the 3 coils swap in new coil and put coils back on then connect the 3 electrical connectors and it should be fine
Customer: replied 3 years ago.

I'm not a mechanic in any way. Out of town , I've got you and my boyfriend giving me directions. More details the better. What and where are the electrical connectors? Wouldn't I remove the 3 coils first to get to module?

Expert:  Gary replied 3 years ago.
the 3 coils actually hold the module down
the 3 electrical connections are on the side of the moduel
once you buy the new module its very visual
like i said if you changed a coil you can handle this job just fine
Customer: replied 3 years ago.

)thanks. I'll put in rating once I see if works. Sounds good. Now have to wait for parts store to open

Expert:  Gary replied 3 years ago.
no problem let me know how it goes