Stalling out and loading up
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=43297
Printed Date: October-06-2024 at 12:24pm
Topic: Stalling out and loading up
Posted By: Maxdog154
Subject: Stalling out and loading up
Date Posted: August-01-2018 at 1:06am
| Hello and new to the forum. I have a 1988 Martinique with a 351 which I bought during the winter. Have had a lot of problems getting it sorted out. When running at wide open it will start to stall out and sputter.I back off on the throttle and it will start running again and will stay constant at 3/4 throttle. Had the fuel tank out and checked it out and it was clean.looked at the one way check valve and it looked okay. The boat shows 570hrs and the motor looks like it or it’s been changed. It has 125lbs compression in each cylinder . It also looks like it has a new carb but it is loading up bad as there is black soot and gas smoke when idling . |
Replies:
Posted By: GottaSki
Date Posted: August-01-2018 at 10:40am
|
Yeah you have carb issues, power valve, or boogared float valves or idle fuel orifices. but thats not why its failing at wot You describe a fuel flow issue and although you had the antisiphon valve out once so far... I suggest take the fuel pickup back out and disassemble the dip tube from the elbow, and see if they snuck a conical screen filter into the dip tube. that likes to clog first and show itself in high flow conditions first.. ------------- "There is nothing, absolutely nothing, half so much worthwhile as messing around with boats...simply messing." River Rat to Mole |
Posted By: TRBenj
Date Posted: August-01-2018 at 11:00am
| I would check the filter at the carb inlet (if so equipped) first, as opposed to pulling the tank/pickup. Have seen that cause the bowl to run dry at wot, and like tom said you’ve got some boogered up passages in there too... I’d be looking for fine sediment throughout. |
Posted By: andrewmarani
Date Posted: August-09-2018 at 11:14am
|
I had a similar issue and thought it was the anti-siphon valve. I replaced it and the issue went away for a bit but the problem came back yesterday. Turns out the gasket between the vacuum secondary housing and the carb had disintegrated for some reason and was clogging the hole, causing the secondary throttle plates not to open. Just posted about it here this morning. Andrew ------------- Builder |
Posted By: Maxdog154
Date Posted: August-17-2018 at 5:12am
| Quit stalling out by changing power valve, all fuel lines and reset timing to 10 degrees. Talked to a tech at Holley and he told me to check vacuum at idle which was 16. He said put a power valve in 1/2 what the vacuum is but I could only find a 6.5 locally. Took out a 2.5 which the 4160 Holley marine carb came with But still will not run above 3300rpms but does not stall out of fuel at WOT. ( So any ideas why it will not run above 3300 ) |
Posted By: 8122pbrainard
Date Posted: August-17-2018 at 7:40am
Bob, What prop is on the boat? ------------- /diaries/details.asp?ID=1622" rel="nofollow - 54 Atom /diaries/details.asp?ID=2179" rel="nofollow - 77 Tique 64 X55 Dunphy Keep it original, Pete < |
Maxdog154 wrote:Posted By: SNobsessed
Date Posted: August-17-2018 at 10:38am
|
Have you verified secondaries are opening? ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: Maxdog154
Date Posted: August-17-2018 at 2:38pm
| 13-13 prop which I put on last night but would not turn up with a 13-12 which I went from. It just seems like it’s lacking on power because it will not turn up. Someone put a lot of new parts on this boat like carb ,starter,alt,and the motor still has the paint on heads like the motor could have been changed. It runs smooth but will not turn up. The boat shows 570hrs and I bought it from a estate auction and had to put a floor in it over the winter so it’s had bugs which I am pulling my hair out . The boat is in great shape now but a lot of time has been spent on it |