davegroves68 Posted September 30, 2010 Share Posted September 30, 2010 Hi Raiders, I have a fairly new (18 months) 350 chev V8 in the back of my Bertie 25. Its been running well until recently but now a problem has cropped up. It runs fine at tickover and fine at high revs but if i try to raise the revs just over tickover speed it splutters and usually cuts out . While spluttering, if i push the throttle wide open, it will rev up and go well. This doesn't seem to be a terminal problem but makes manouvering at slow speed a bit tricky. I'm thinking its a carby problem but would appreciate your thoughts before i coff out $$$$ if its something i can fix. It has a Holley 4 barrel carb fitted. Any advice would be greatly appreciated. Thanks , Dave Link to comment Share on other sites More sharing options...
Anroco Posted September 30, 2010 Share Posted September 30, 2010 (edited) You could try ( as a low cost do it yourself thing ) a can of "Carby Clean" ( in a spray can ) this will clean most of the internals in the carby pretty thouroughly, and get rid of any deposits in it. Simple to use. ( This may sound crazy but i used to pour water into mine slowly whilst running ( giving her a boot full of revs ) to clean the carby and internals.. Was told this by and old mechanic. I never had a problem. Could be the fuel mixture setting has moved/worked its way in/out, don't know what carby it is but if its a larger one like a 650dpp or 850dpp ( Holley ) can be fun setting it but sounds like its flooding a little under low revs and under full throttle when the butterflies fully open, it sucks out all the fuel causing no spluttering. Just my thoughts. CHeeRS Antun Edited September 30, 2010 by Anroco Link to comment Share on other sites More sharing options...
jewieslayer Posted September 30, 2010 Share Posted September 30, 2010 is it vac or mechanical secondarys Link to comment Share on other sites More sharing options...
davegroves68 Posted September 30, 2010 Author Share Posted September 30, 2010 is it vac or mechanical secondarys Not sure what you mean jewieslayer. When i open up the throttle slowly from tickover, i can hear more air being sucked into carby then it splutters and dies. dave Link to comment Share on other sites More sharing options...
Day's Fishin Posted September 30, 2010 Share Posted September 30, 2010 It sounds like a float sticking. Before pouring any sort of carbi cleaner in take the top of and check the fuel in the bowls. The coke cure can work but it contains heap of sugar. I use brake cleaner on my carbi's. Just spray it in while it is idling and then take the rev's to about 3000 for 20secs. It will clean out better then carbi cleaner. Regards Jeff Link to comment Share on other sites More sharing options...
olitay Posted September 30, 2010 Share Posted September 30, 2010 Hey Dave, i had a similar issue with mine. turned out to be the auto choke on the carbie was flooding at low revs.... The mechnaic ended up overriding the auto choke by disconnecting it. Makes it tricky to cold start but definitely better in the long run. Not sure if your problem is the same but its worth checking i guess. Good luck. Link to comment Share on other sites More sharing options...
IVZ350 Posted September 30, 2010 Share Posted September 30, 2010 i used to have this problem in a car of mine as well so i dont see why it would be any different, try using a fuel pressure regulator mate if all else fails. Ivz Link to comment Share on other sites More sharing options...
tuffy Posted October 1, 2010 Share Posted October 1, 2010 (edited) Dave, I used to have a ski boat with a worked 350 Chev and 4 barrel Holley - had never ending problems with it - used to splutter when powering on all the time. Ended up replacing the Holley with a single throat Stromberg carby, simple and reliable - no noticeable reduction in power and never a problem after that. Also reduced fuel consumption substantially. 25 ft Bertie isn't a racing car so may be a viable solution. Just a suggestion. Cheers, Russ. Edited October 1, 2010 by Tuffy Link to comment Share on other sites More sharing options...
davegroves68 Posted October 1, 2010 Author Share Posted October 1, 2010 Thanks for the replies guys. That lot will keep me busy on saturday morning trying a few things out. If anyone is around Taylors Point, come say hi. I'm sure i will have a line out in the hope of a nice flattie I'll let you know how i get on with it. Hopefully an easy fix, but knowing boats,$$$$$$ will be involved. Dave Link to comment Share on other sites More sharing options...
Yarraone Posted October 1, 2010 Share Posted October 1, 2010 if it has a vacume secondry it could be the diapham.. but I think it may be blocked jets Link to comment Share on other sites More sharing options...
davegroves68 Posted October 2, 2010 Author Share Posted October 2, 2010 Well, I have just come back from a few very wet few hours trying to sort the problem out and i can report that with the help of you kind fishraiders i have success Basically, it seems it was just blocked jets. It took a bit of doing with the carb cleaner and a thin piece of wire but she seems to be purring like a kitten now. the carb cleaner took a while to clear it but it seems all good now I even got a legal snapper and flathead while i was working. Thanks again guys Dave Link to comment Share on other sites More sharing options...
davegroves68 Posted October 2, 2010 Author Share Posted October 2, 2010 i suggest you change your fuel filter then have a nice feed tonight and a legal snap well there you go half ya luck Yeah, I have a new inline filter all ready to go in along with a new fuel pump, as the existing one makes too much noise. Thanks again fellas. Link to comment Share on other sites More sharing options...
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