No Spark, but power to coil???
#1
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I am dead in the water right now. I was cruising and my engine (merc. 502 carbed) sputtered 2-3 times and quit. It felt like the carb was loading up and my plugs were fouled. At first I pulled the plugs because it seemed like they were fouled. My #7 plug was completely fried. I replaced all the plugs and did not fire at all. Pulled one plug and rolled engine over and no spark. Put test light on coil and I have power to coil. Put a used coil I had off another 502 and still no spark. Where do I go from here, and why did this plug burn like it did. All the rest of plugs were fouled but still in good shape.
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Originally Posted by rdoactive
What kind of ignition?
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It is possible the coil to distributor wire is broken or bad.
How are you checking for spark? If you have or can borrow a working timing light it will help diagnose this, you can see if the distributor is feeding the plug wires with it.
Also, I am assuming you are running the stand alone MSD distributor, check to make sure it is still plugged in and properly grounded.
Bad plugs/wires/coils can wipe out the electrical pick-ups in distributors. They don't always do it, but it happens.
How are you checking for spark? If you have or can borrow a working timing light it will help diagnose this, you can see if the distributor is feeding the plug wires with it.
Also, I am assuming you are running the stand alone MSD distributor, check to make sure it is still plugged in and properly grounded.
Bad plugs/wires/coils can wipe out the electrical pick-ups in distributors. They don't always do it, but it happens.
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Originally Posted by jmherbert
It is possible the coil to distributor wire is broken or bad.
How are you checking for spark? If you have or can borrow a working timing light it will help diagnose this, you can see if the distributor is feeding the plug wires with it.
Also, I am assuming you are running the stand alone MSD distributor, check to make sure it is still plugged in and properly grounded.
Bad plugs/wires/coils can wipe out the electrical pick-ups in distributors. They don't always do it, but it happens.
How are you checking for spark? If you have or can borrow a working timing light it will help diagnose this, you can see if the distributor is feeding the plug wires with it.
Also, I am assuming you are running the stand alone MSD distributor, check to make sure it is still plugged in and properly grounded.
Bad plugs/wires/coils can wipe out the electrical pick-ups in distributors. They don't always do it, but it happens.
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check dist have some one crank mtr with cap off make sure rotor is turning you might of ate a dist gear,
take a test light to the - side of the coil attach other end to pos on batt crank mtr the test light should flash to show pulse to coil if not you have a bad pick up
take a test light to the - side of the coil attach other end to pos on batt crank mtr the test light should flash to show pulse to coil if not you have a bad pick up
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What kind of Champion plug is that?
It looks pretty mangled, is it a split fire? If so, I wouldn't use them in a boat. Use a race plug.
It looks pretty mangled, is it a split fire? If so, I wouldn't use them in a boat. Use a race plug.
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If you are running MSD's ready-to-run distributor, it is probably a bad module which is not customer serviceable.
Send the distributor back to them and they will replace it with a 'reman' replacement for around $75.00. Be sure to send in the cap and rotor and they get replaced in the process. BTDT
Send the distributor back to them and they will replace it with a 'reman' replacement for around $75.00. Be sure to send in the cap and rotor and they get replaced in the process. BTDT