Winnipesaukee Forum - View Single Post

bigdog · 08-01-2009, 06:57 PM

Thanks NoBozo for the info.

I have to agree with you about the Ignition wires ! I have replaced in the 3 yrs I've owned the boat, and don't know when previous owner replaced, or if wire are original?

The stalling and backfiring only starts after running boat for about 15minutes. When I initially start the boat it appears to run smooth, even under acceleration. Doesn't seem to be an issue.

If the Distributor Cap and/or Rotor had corrosion wouldn't the stalling, running rough and back-firing behavior begin as soon as the engine was started ? Cap & Rotor being replaced next week with new parts. Not going to bother attempting to clean, as parts may be original ?

Also, I've been reading that the fuel pump (electric MerCruiser in my case),
can have problems with an internal diaphragm, causing improper flow and pressure of gas to the Carb. Under these circumstances the Carb would run 'lean'. I have been told when Carb runs lean and can cause 'back-fire' !

So we still have several possible issues causing the problem.

Trying to take a one step approach, with the least costly first.
Will let Forum know results.

Oh...... I'll be on Winnie all next week, 8/8, with family and boat.
If I need to get additional parts over vacation, I have heard of M & M Salvage in Meredith. I realize all their parts are used.
Has anyone purchased from these folks ? Comments?

Thanks,
Bigdog

08-01-2009, 06:57 PM	#47
bigdog Senior Member Join Date: Apr 2006 Location: Central MA-Gilford Posts: 1,418 Thanks: 314 Thanked 117 Times in 94 Posts	Engine Stalling Problem Thanks NoBozo for the info. I have to agree with you about the Ignition wires ! I have replaced in the 3 yrs I've owned the boat, and don't know when previous owner replaced, or if wire are original? The stalling and backfiring only starts after running boat for about 15minutes. When I initially start the boat it appears to run smooth, even under acceleration. Doesn't seem to be an issue. If the Distributor Cap and/or Rotor had corrosion wouldn't the stalling, running rough and back-firing behavior begin as soon as the engine was started ? Cap & Rotor being replaced next week with new parts. Not going to bother attempting to clean, as parts may be original ? Also, I've been reading that the fuel pump (electric MerCruiser in my case), can have problems with an internal diaphragm, causing improper flow and pressure of gas to the Carb. Under these circumstances the Carb would run 'lean'. I have been told when Carb runs lean and can cause 'back-fire' ! So we still have several possible issues causing the problem. Trying to take a one step approach, with the least costly first. Will let Forum know results. Oh...... I'll be on Winnie all next week, 8/8, with family and boat. If I need to get additional parts over vacation, I have heard of M & M Salvage in Meredith. I realize all their parts are used. Has anyone purchased from these folks ? Comments? Thanks, Bigdog