2G 420A No Spark

[UCF201101]

I have searched for hours trying to find a topic that discusses the issue about having no spark. I have rebuilt 5 420a's and never had a problem. I am highly familiar with these engines. However, this issue has me truely stumped. The car had spark previously. However, the spark was delayed towards the end of the starting. Next thing I know it, the car isn't having any spark. The list below is what I have already done. Please feel free to give me advise or point me towards the right direction.

1. Cam sensor
2. Crank Sensor
3. Spark plugs
4. Coil pack
5. Spark plug wires
6. ECU
7. Every other sensors in the engine bay

All the sensors have power and the correct voltage. What causes the car to recieve spark?

 

[93laser1g]

Did you test the plugs? What plugs are you using? Did you open The ECU and see if it was bad? Did it smell like smoke?

 

[UCF201101]

Thanks for the response. I swapped the ecu out with a known working eclipse (have ten of them ) and I have bosch platinum.

 

[93laser1g]

Thanks for the response. I swapped the ecu out with a known working eclipse (have ten of them ) and I have bosch platinum.

Im not exactly sure but i think you should be running ngk's. Is your car still having problems?

 

[UCF201101]

I changed out the spark plugs too. This isn't the turbo engine. THis is bone stock 420a that im trying to get running.

 

[93laser1g]

I changed out the spark plugs too. This isn't the turbo engine. THis is bone stock 420a that im trying to get running.

Did you check the coils, ISC, CAS? Did you do a spark test?

 

[UCF201101]

I changed out the coil, plugs, spark plugs, ecu, pcm, ALL sensors, and there is no spark. I did do a spark test on all plugs. Spark plugs 1 and 4 does NOT get spark. HOwever, spark plug 2 and 3 does. It does it only when the relays kick towards the end of the starting cycle. To my understanding, it should be getting spark as you turn the key over. THis does not occur. The only time the spark happens is when you get done turning the key on and the relays kick and thats when spark occurs. Im stumped...

 

[93laser1g]

I changed out the coil, plugs, spark plugs, ecu, pcm, ALL sensors, and there is no spark. I did do a spark test on all plugs. Spark plugs 1 and 4 does NOT get spark. HOwever, spark plug 2 and 3 does. It does it only when the relays kick towards the end of the starting cycle. To my understanding, it should be getting spark as you turn the key over. THis does not occur. The only time the spark happens is when you get done turning the key on and the relays kick and thats when spark occurs. Im stumped...[/QUOTe
I really dont know then maybe its a gas problem or air have you checked your timing?

 

[UCF201101]

I rechecked the timing about 8 times and redid it 5 times. I am confident that it's not the timing. The alignment marks are in correct position. The cams spin over. The dowl pins are not broke. Would an alarm cause this problem? If so how do I get rid of the alarm and get it running?

 

[stars]

All your parts you have been swapping out are O.k. so don't throw anymore parts at it because as you know it is not going to fix it. I have been trying to help allot of people with this issue, you are not alone. So far I have came across about 12 people not having a spark on atleast 2 cylinders. This is just within the past 2 weeks so it is a common problem that's happening.

What you have is a particular wire not getting power to the ignition module thru the coils. Nothing is exciting that coil to fire on those 2 dead cylinders. That's why you have 2 cylinders sparking and 2 cylinders that are dead. Like I mentioned, I have it narrowed down to that location, but just have to isolate that circuit and continuity check it, and check for ground/voltage. There must be a break somewhere in the wiring harness close to that point somewhere, that's about as much information as you are going to get from anyone at this point, I have tried. Your parts are all good you see, if they wasn't then you would have no spark on all 4 cylinders, instead you have no spark to 2 cylinders so that means the system is working halfway atleast, so can rule out a defective part there, now that leaves only the wiring that connects those parts into the ignition circuitry. Any break in wiring continuity can disable half or the entire electrical circuit.

Check wire from ecu going to coil wire #1and #4 for continuity, if you are sure you have ruled out the CAS and ICM.

Update"
One person so far has fixed the problem by replacing the ignition transistor. Check it over really good because that would be the only location besides the ecu for "break" in the circuit to occur and cause that particular problem.

 

[UCF201101]

Thank you for the response. I appreciate it a lot. I have one quick question. Why does the spark occur after the key is relased as oppose to cranking and getting spark? It use to have an alarm system on it (factory and aftermarket antitheft alarm). WHat is a anti-theft controller? Could this be a problem?

 

[stars]

Anti theft controller disables the starting circuit or ignition circuit depending on how it's wired. Is it a factor alarm or aftermarket? Yes, they can be a problem if the alarm circuit fails and shuts down the systems attached to it. They can either disable the starter or the fuel pump. Some disable the ignition to where it will not allow any spark or the car will start up and run for a few seconds and shuts off. It all depends on what circuits was wired into it.