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97 Merc 90elpto Weak Spark all plugs

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pyrodenis

Member
On my spark plug tester, I get an orange spark with al spot of white in the center. I think I've read that it should be white (even blue white.) It is stronger than it was. How should the sparks it look?
I've replaced:
trigger (with CDI 134-4512-3)
3 CDMs (with CDI 114-7509)
stator (with CDI 174-2075K2) (old one was CDI 174-832075K1) It's measuring 462ohms. Is this right?
Flywheel replaced last summer.
I have a voltage regulator (CDI 194-5279), but I don't think that affects the spark; does it?
Also, my kill wire is shutting down the engine, disconnected from the harness.
Voices of experience please?
THanks,
Denis
 
Why did you replace all this? Have you tested DVA output as ohms test is not trusted in my book. Seen to many parts pass OHM spec and still be bad...
 
faztbullet said:
Why did you replace all this? Have you tested DVA output as ohms test is not trusted in my book. Seen to many parts pass OHM spec and still be bad...
Click to expand...
Good question Faztbullet.
I replaced the trigger because of blk and wht wires looked melted at or near touching block. Did the stator at same time because of low ohms and 20 year age. I know so little about the history of this engine, but it's at least 23 years old, multiple owners, and alot of evidence it's not been loved. Flywheel had broken magnets. It starts right up, but only with the BLK/YEL unplugged near the CDMs. (The in-line bullet plug) The in-line plug tester is a Lisle and shows orange on all 3 plugs. I do get a blue-white spark across outside insulation to metal though.
I have the wiring harness unplugged, at the engine, so that the remote control is out of consideration. With engine running, I reconnect the BLK/YEL bullet plug, and the engine kills. So, I must have a short in the harness plug; right? Assumed short to something else; no joy.
But, I just disconnected the PPL bullet connector in-line from the disconnected harness to what I believe is the Oil Warning Module. NOW the BLK/YEL line does NOT kill the engine. Do I assume that the Oil Module is providing some sort of ground through the disconnected harness?
Thanks for your help.
Denis
 
I can't find a rev limiter anywhere. THough the parts list for my year, model and serial # does show one, I can't find a spot for it on the block.
 
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