2000 GM v6 Volvo Penta Backfire Problems

[cbcmarine]

Hey all I am stumped I have this V6 Carb model GM and I am getting backfireing ?? I have had the boat since new and it has done it before but not very often but this year it seems worse any suggestions would be grewatly appreciated.

Shaun

 

[cbcmarine]

Re: 2000 GM v6 Volvo Penta Backfire Problems

Just some side notes it doesn't seem to matter if I am running for long periods or cold it does it at random times. I could be running good for half hour then a couple of backfire's ??

 

[chiefalen]

Re: 2000 GM v6 Volvo Penta Backfire Problems

Try some seafoam, could be water in the fuel. When was your last tune up timing off a little?

 

[cbcmarine]

Re: 2000 GM v6 Volvo Penta Backfire Problems

I thought about the water problem and have replaced filter and running iso in the fuel. Does timming go out on electronic ignition ??

 

[chiefalen]

Re: 2000 GM v6 Volvo Penta Backfire Problems

Ok heres a link; After you try this post the results.

Timing chain have known to stretch. Dist. have known to get worn.

Have you cleaned out the fuel filters in the fitting at the carb, fuel pump, and fuel pickup. Check anti-syphon valve,vent to tank.

http://www.secondchancegarage.com/public/186.cfm

 

[MikDee]

Re: 2000 GM v6 Volvo Penta Backfire Problems

Usually an occasional backfire will indicate a lean condition, check out your carburetor, did you check, or replace the in-carb filter, behind the large nut?

 

[MikDee]

Re: 2000 GM v6 Volvo Penta Backfire Problems

Backfiring is the result of improper ignition timing, a poor fuel mixture, or a combination of the two. I would start by checking timing and dwell (full RPM range) and then check for a lean fuel/air mixture.

You didn't say, what carb is on the engine?

IMO Backfiring through the carb can be caused by retarded ignition timing as well, but it isn't usually sporadic, it's repeated. Point gap or improper dwell due to wear, and neglect, can cause this. A lean condition would cause sporadic backfiring, as was mentioned.

 

[cbcmarine]

Re: 2000 GM v6 Volvo Penta Backfire Problems

Sorry Guys I have been at the job that pays the bills !!! I will check the carb tomorrow to see what type it is, I do know it is a two barrel but will get back to you I will also look at replacing the filter behind the big Nut as I did not know there was one !
Thanks for the help

It does not do it often but the other day it did do it more often

The Boat does not get many hours a year on it maybe 20 per year, Yeah I know not enough but the bills must be paid

till tomorrow

 

[cbcmarine]

Re: 2000 GM v6 Volvo Penta Backfire Problems

So I checked the filter behind the Large nut and does not seem dirty but I will change just to be on the safe side. It is a Holly 2 barrel carb.