No start, Have spark fuel and compression. 140 mercruiser

[Steve8686]

Fuel to carb, spark on all 4 cylinders. Just ran fine a week ago. Compression 110-115 on all cylinders. I know thats getting a little on the low side but that shouldnt be the issue. No fuel on plugs after cranking. Pour a cap or two of fuel in each cylinder and still wont fire. This is a tough one, never seen anything so wierd. Thanks.

1972 Mercruiser 140.

 

[Bondo]

Re: No start, Have spark fuel and compression. 140 mercruiser

Fuel to carb, spark on all 4 cylinders. Just ran fine a week ago. Compression 110-115 on all cylinders. I know thats getting a little on the low side but that shouldnt be the issue. No fuel on plugs after cranking. Pour a cap or two of fuel in each cylinder and still wont fire. This is a tough one, never seen anything so wierd. Thanks.

1972 Mercruiser 140.

Ayuh,... Pour a 1/2 oz. down the carb throat, while yer crankin' it...

If it don't light, it ain't firin'... check the points...

 

[Steve8686]

Re: No start, Have spark fuel and compression. 140 mercruiser

Timing has been set just recently. Still no fire every once in a while a backfire, maybe every 6-7 rotations of engine.

 

[Steve8686]

Re: No start, Have spark fuel and compression. 140 mercruiser

Unbelievable, it was the spark plugs. they were sparking outside the block but not inside the cylinder. Wow that I have never seen, and caused me about 5 days of grief for something so simple.

 

[jimbo1229]

Re: No start, Have spark fuel and compression. 140 mercruiser

how the hell is that possible, unless the plug wire boots were not snug?!

 

[Don S]

Re: No start, Have spark fuel and compression. 140 mercruiser

What did you do to the ignition system or the engine, since the last time it ran, don't try to cover things up, it's your engine not running.