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  #1   IP: 99.145.61.19
Old 04-09-2019, 09:13 AM
jsmickey19 jsmickey19 is offline
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Starts and Runs (sort of)

Hi All

Have an A4 that starts and will barely run at idle (just chugs) when the throttle is applied she dies. In the last three years new points, plugs , rotor, and cap have been installed as well as a new electronic fuel pump.

This engine has run flawlessly for the last 30 years (until I sold it to the present owner ). We thought it may be the carb and rebuilt it however the problem still persists.

Thanks
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  #2   IP: 107.77.106.32
Old 04-09-2019, 09:51 AM
tenders tenders is offline
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Clogged exhaust?
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  #3   IP: 98.165.207.17
Old 04-09-2019, 10:24 AM
zellerj zellerj is offline
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Clean and dry fuel?
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  #4   IP: 97.93.70.7
Old 04-09-2019, 12:29 PM
Dave Neptune Dave Neptune is offline
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Exclamation

j-19, how do the plugs look? A few pics of them may be a big help.

If the exhaust has not been done for 5~6 years or longer this would be a big possibility. This scenario "USUALLY but not always" sort of sneaks up over a few months not all of a sudden. Give this some serious thought and it is not to difficult to test in most cases.

Fuel can be an easy test with an aux tank with fresh fuel also an easy test.

One other possibility is the choke not "opening" when you think it is so a visual check will eliminate this possibility.

Clean fuel, properly timed spark and clear exhaust equal good performance.

When cleaning the carb was special care done with the float setting and the sealing of the emulsion well in the center of the fuel bowl? this seal is very important for proper metering.

Dave Neptune
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  #5   IP: 99.145.61.19
Old 04-09-2019, 06:44 PM
jsmickey19 jsmickey19 is offline
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Thanks All!

Didn't think about the exhaust. Will definitely take a look at it. Had the choke problem in the past so that was one of the first things I checked.
This problem began at the very end of last season and they limped into port with the engine just barely running. The new owner rebuilt the carb himself with a kit from Moyer as well as the instructional video and nothing changed. We used the starter to winterize the engine and are now trying to figure things out.
I have a strong suspicion that this is a fuel problem as this boat does way more sitting than sailing.
Will try running off of a jug of fresh fuel and see what happens.
Thanks , will keep you posted!
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  #6   IP: 47.54.60.174
Old 04-14-2019, 04:36 PM
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Check compression, especially if it has been sitting a while. Some will start with partially sticking valves but just have nothing and die on throttle up. Worth a check. Many overlook this until they've tried everything else. Air, fire, fuel and compression.
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  #7   IP: 70.185.132.18
Old 04-15-2019, 03:12 PM
JOHN COOKSON JOHN COOKSON is offline
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Quote:
Originally Posted by jsmickey19 View Post
Thanks All!

This problem began at the very end of last season and they limped into port with the engine just barely running. The new owner rebuilt the carb himself with a kit from Moyer as well as the instructional video and nothing changed.
!
If the problem started suddenly while motoring maybe something wrapped around the prop.
Has the prop been checked for fouling?

TRUE GRIT

Last edited by JOHN COOKSON; 04-15-2019 at 04:30 PM.
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