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New Carb, still hard starting and now hesitating.
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1StopJeff View Drop Down
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Points: 43 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1StopJeff Quote  Post ReplyReply Direct Link To This Post Topic: New Carb, still hard starting and now hesitating.
    Posted: April-24-2013 at 8:00pm
Need some help. I took the stock carb apart and it didn't look too good so I just bought a new marine 4160 part# 0-80364 from Summit for my PCM 5.8. I installed it and it is still somewhat hard to start and now I have a hesitation coming out of the hole. Can someone point me to a tuning guide for this carb or give some advice? I used to be able to tune the heck out of a Quadrajet but that was 25 years ago and haven't done much with Holleys.
1991 Nautique Excel
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cphase View Drop Down
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Points: 795 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cphase Quote  Post ReplyReply Direct Link To This Post Posted: April-24-2013 at 8:03pm
Have you checked the timing? If so what was it?
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Jeff
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TRBenj View Drop Down
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Have you checked your timing?
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cphase View Drop Down
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Points: 795 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cphase Quote  Post ReplyReply Direct Link To This Post Posted: April-24-2013 at 8:03pm
Great minds!!
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Jeff
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1StopJeff View Drop Down
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Points: 43 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1StopJeff Quote  Post ReplyReply Direct Link To This Post Posted: April-24-2013 at 8:32pm
Yes, timing is at 10 degrees per spec.
1991 Nautique Excel
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cphase View Drop Down
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Points: 795 		Post Options Post Options   Thanks (0) Thanks(0)   Quote cphase Quote  Post ReplyReply Direct Link To This Post Posted: April-24-2013 at 8:57pm
80364 is 450 cfm for a 5.0/302, you nee a 600 cfm 80319 for a 5.8/351.

I doubt though that has any bearing on you hard starts.
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Jeff
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wwchevy View Drop Down
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Points: 369 		Post Options Post Options   Thanks (0) Thanks(0)   Quote wwchevy Quote  Post ReplyReply Direct Link To This Post Posted: April-25-2013 at 10:26am
Was there a problem other than the hard starting that prompted you to remove the carb and take it apart? Is the carb the only component you changed? Did you confirm you are getting a good shot of fuel when you push the throttle wide open?
wwchevy
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1StopJeff View Drop Down
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Points: 43 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1StopJeff Quote  Post ReplyReply Direct Link To This Post Posted: April-25-2013 at 7:32pm
The boat had been sitting for a while before I purchased it. It was very hard starting and I was going to rebuild the carb but when I took it about it didnt look so good so I decided to replace it. I did confirm that it is getting a good shot of fuel down the primaries.
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1StopJeff View Drop Down
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Points: 43 		Post Options Post Options   Thanks (0) Thanks(0)   Quote 1StopJeff Quote  Post ReplyReply Direct Link To This Post Posted: April-25-2013 at 8:48pm
That is interesting that it is the wrong CFM for the 351. Besides the hesitation is sure runs out nice.
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JasonR View Drop Down
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Points: 37 		Post Options Post Options   Thanks (0) Thanks(0)   Quote JasonR Quote  Post ReplyReply Direct Link To This Post Posted: April-26-2013 at 1:21am
Points, plugs, cap and rotor. Check the ballast resister.
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Bri892001 View Drop Down
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Points: 4945 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Bri892001 Quote  Post ReplyReply Direct Link To This Post Posted: April-26-2013 at 6:12pm
Originally posted by 1StopJeff 1StopJeff wrote:

...I did confirm that it is getting a good shot of fuel down the primaries.


Are you getting that shot right away?

Take up any slack in the accelerator pump adjustment screw. If the throttles are opening without that shot coming immediately, you can get a hesitation.
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