165 hp Merc...Surging question

[capercanuck]

I just rebuilt my 165 hp, 6 cylinder mercruiser. It is "surging". The motor idles perfectly, and it also starts perfectly. When the engine comes under load, its RPM's increase and decrease, someone called it "surging". Up around 3000 RPM's I am on plane, but the tach drops to about 2800 and then up to 3100. This is a constant thing. I changed the two fuel filters. There are three things I have yet to do....first, recheck the timing, second, replace the fuel pump, and third, have the carb cleaned. Anyone have any ideas? Also, I am wondering if the vaccuum advance needs to be hooked up after the point system has been changed to the electronic system. If so, does the vacuum advance port on the base of the distributor housing need to be connected to the port on the top of the manifold, or the one on top of the head. Thanks...

 

[DJ]

Re: 165 hp Merc...Surging question

capercanuck,<br /><br />Use the manifold port.

 

[capercanuck]

Re: 165 hp Merc...Surging question

Ok, I'm using the manifold port, but do I need the vaccuum advance on electronic distributor? Thanks...

 

[kidleini]

Re: 165 hp Merc...Surging question

Hello, first timer here, so bear with me. I am experiancing the exact problem described above. I just tested and machined the head and replaced all gaskets etc. and this problem came up. Starts great, idles great. Thought it was gas, but have since moved on to new gas. Have you made any progress on figuring it out?

 

[Bondo]

Re: 165 hp Merc...Surging question

Ayuh,.....

This post is 6 YEARS OLD......

Welcome aboard Kidleini,...

If youpost Your Own Thread, rather than Hy-jacking this 6 YEAR OLD thread,...
You'll get usable Answers...

 

[kidleini]

Re: 165 hp Merc...Surging question

Bond-o,

Thanks for the heads up. Interestingly enough while making my way to the "6 year old" post I learned quite a bit about potential causes. I am going to trouble shoot some possibilities. If I run out of luck, I will post -a- new

Cheers!
Kid

 

[Bondo]

Re: 165 hp Merc...Surging question

Ayuh,....

No Problem Kid,.... That's Exactly what the archives are For......
But,...
When you get to the point you actually have Questions that you haven't found Answers too,....

That's when you have to start a New thread of your Own,......

Just remember when you Do,....
Include ALL of the Information on your driveline,+ a clear explaination of the Issue you're trying to Fix.....

Good Luck,.....