I just had my motor built and running recently. I drove and put over 100 miles trying to break it in. While cruising on the interstate, my car suddenly started sounding weird. I put it in neutral to coast down but the car shut off. I've checked timing, which is good. Did a compression check, which is good and even across. Got fuel, got oil, got air. Checked all the couplers and vacuum lines, good. Everything seems good, except spark. Seems like 1 and 4 is sparking, but 2 and 3 isn't sparking. I've changed spark plugs, and coils, but same thing. 1 and 4 still spark, 2 and 3 still no spark. Anybody have any idea's??

 

Is your check engine light on? Can you get a scan tool and read the engine codes?

 

There's no check engine light on. Oh, it's an Evo 9. I used a friends coils from his Evo 8 if that mattered.

 

Is there a way to check if the ecu it is going bad? People are thinking it's my ecu.

 

try different coils? im no expert but if it were me i wouldnt be using evo Vlll coils in a IX


SpoolinUP has a good COP system to use! im about to order one this week!

 

Exhaust cam sensor. This just happened to me. I had fuel all over, spark on 2, it would not fire over. Most times it would start a bit, but die pretty much immediately.

Everyone thought it was my ECU as well. Turned out the immobilizer had tripped, and after I fixed that with ECUflash and got fuel/spark back, realized I only had spark on 2 cyl. I tried swapping coil packs, I had an evo 9 and put an evo 8 coil pack in that I bought used, made no difference, still only spark on 2. Swapped exh cam sensor, car fired right up.

I'm still driving around with 1 evo 9 pack and 1 evo 8 pack...

 

I sure hope your right. Now, i need to find my evo friends and see if they can swing by to let me test.

 

good luck on that

 

changed out the exhaust cam sensor. But it didn't fix the problem. The motor is running smoother though. But still not firing on 2 and 3. Any more ideas?

 

most likely its your ECU man

 

I'm not good with electrical stuff but this is what I did. I cranked the car and let it idle. I used a test light and touched the ecu pin for ign coil 1 and 4. The motor sounded like it wanted to shut off. I touched the ecu pin for ign coil 2 and 3. Nothing happen. Does this confirms that the ecu is bad?

 

problem solved. Had a short in the wire harness. The wire went to the coil for 2 and 3. It's all covered and motor is running good again.

Ecu wasn't the problem.

 

I would upgrade to a spark tech system, havent driven on mine yet but my tuner tells my my car is doing much better with it on .

 

I want to. But i spent a good bit on an AEM EMS already. lol