Rep Power: 0

Hi all.
Newbie poster, pre-apologize for any forum gaffes.

Elderly friends car, standing for 2 weeks and now a no start.
Have some knowledge and tools.
No spark.
Replaced coil. No help.

Have LED tester and have been probing 8 wire distributor harness in attempt to isolate cause.

According to diagnostic I found on internet, when engine cranked I should get a pulse on 1 or both of the 2 harness wires nearest the firewall.

I'm getting power on LED when ignition in position II but LED goes dead when engine being cranked.

My electrical system experience is a bit limited.

Can I get a confirmation that this behavior is:
1. wrong
2. indicative of PCM/ECM failure
or
3. possibly and ignition key/cylinder short.

TIA.
Dave

 
Rep Power: 209

are you getting a spark at the plugs?

that would be the first thing i would check,

 
Rep Power: 0

Hi Mikey, thanks for reply.
No spark at plugs.
In S. Florida, so no temperature related issues.

I've followed trouble shooting sequence here:
http://easyautodiagnostics.com/honda...system-tests-5

And have reached point 6:
"If the triggering signal is present, the LED Light will light on and off continuously as long as your assistant is cranking the engine."

The LED goes dead when I crank the engine.

Short in ignition cylinder?
Dead ECM/PCM?
Ghosts?

 
Rep Power: 209

my first suspicion would be the ECM on the distributor

 
Rep Power: 0

Certainly a possibility.
But I think I'm upstream of the distributor at the moment and not getting the signal from the PCM that I am supposed to get coming in to the distributor harness:

"If the triggering signal is present, the LED Light will light on and off continuously as long as your assistant is cranking the engine."
"The LED goes dead when I crank the engine."

Dave

 
Rep Power: 0

Hi Mikey,

Thanks for suggestions.
Turned out to be the main relay.

So in case anyone stumbles across this thread:

Symptom - No spark, **No Check Engine Light when ignition turned to on**

Cause - Main relay gone bad.

Dave