Forums
NautiqueParts.comCalendar Photo Submission
  New Posts New Posts RSS Feed - Engine shutting off-stalling
  FAQ FAQ  Forum Search   Register Register  Login Login

Engine shutting off-stalling
 Post Reply Post Reply   
Author
  Topic Search Topic Search  Topic Options Topic Options
Nauti87 View Drop Down
Senior Member
Senior Member
Avatar

Joined: June-05-2012
Location: Central Florida
Status: Offline
Points: 114 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nauti87 Quote  Post ReplyReply Direct Link To This Post Topic: Engine shutting off-stalling
    Posted: July-14-2013 at 10:06pm
'87 351 PCM, EI of some brand (can't tell)fresh rebuild on the carb, runs great!
When the boat is warming up, either on the trailer or in the water, it starts right up, but it will die probably 5 times (even at a high idle 1200rpm).
It's not fuel related, it's like the ignition was shut off. All I've had time to do is have a test light on the coil, never loses 12v. Also had a spark checker on the plug. When I get a chance I'll test the signal to the coil. I've done some searching on here but haven't seen the same "issue".
Just figured I would throw this out there and see if anyone has had the same issue.

Thanks.
Back to Top
backfoot100 View Drop Down
Platinum Member
Platinum Member


Joined: January-03-2007
Location: United States
Status: Offline
Points: 1897 		Post Options Post Options   Thanks (0) Thanks(0)   Quote backfoot100 Quote  Post ReplyReply Direct Link To This Post Posted: July-15-2013 at 12:46pm
How does it run after it's been wormed up?
Back to Top
Nauti87 View Drop Down
Senior Member
Senior Member
Avatar

Joined: June-05-2012
Location: Central Florida
Status: Offline
Points: 114 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nauti87 Quote  Post ReplyReply Direct Link To This Post Posted: July-15-2013 at 2:20pm
Foot,
It runs great after it throws it's temper tantrum. I actualy had a car years ago that had a distributor loose ground occasionally. But I don't think that would do it with an optical pick up.
Back to Top
backfoot100 View Drop Down
Platinum Member
Platinum Member


Joined: January-03-2007
Location: United States
Status: Offline
Points: 1897 		Post Options Post Options   Thanks (0) Thanks(0)   Quote backfoot100 Quote  Post ReplyReply Direct Link To This Post Posted: July-15-2013 at 2:56pm
Have you checked the choke? Sounds like the choke might be too far open when it's cold. Common occurance to have the bimetal spring in the choke just be worn out or not have the full range of motion it should.

When it's cold, remove the flame arrestor and look at the choke plate. It should only have 1/16"-1/8" gap from the choke horn. Any more than that and you'll have a terrible time keeping it running until it's warmed up. If it's not properly adjusted, loosen the three screws around the edge of the black choke housing and rotate the choke housing to adjust the choke plate gap.

Then turn the key on but don't start it. The choke plate should start to open when it gets energized from the ignition switch. It should be completely straight up and down in the choke horn in about a minute. Maybe a little longer.

If the choke doesn't have the full range of motion or can't be properly adjusted, time to replace it.
Back to Top
TRBenj View Drop Down
Grand Poobah
Grand Poobah
Avatar

Joined: June-29-2005
Location: NWCT
Status: Offline
Points: 21172 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: July-15-2013 at 3:08pm
Originally posted by backfoot100 backfoot100 wrote:

When it's cold, remove the flame arrestor and look at the choke plate. It should only have 1/16"-1/8" gap from the choke horn. Any more than that and you'll have a terrible time keeping it running until it's warmed up.

Im not so sure, Eddie... my 2 best starting boats either have the choke disconnected or milled off entirely. Im not convinced theyre good for much at all, at least at the moderate temperatures I tend to boat in. Now HW may appreciate his, since he skis until the water freezes!

I have seen some EI modules do some very strange things, and I would wager a guess that is what he's dealing with. I had one that would lose spark at ~1500rpm... ran great at idle and if you go WOT out of the hole, would go great at 2k rpm on up. Easing the throttle up (or down) would result in an instant shut-down just off idle speed. So these things can be a little glitchy at times.
Back to Top
Nauti87 View Drop Down
Senior Member
Senior Member
Avatar

Joined: June-05-2012
Location: Central Florida
Status: Offline
Points: 114 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nauti87 Quote  Post ReplyReply Direct Link To This Post Posted: July-15-2013 at 4:57pm
I just had the carb rebuilt (first one I've ever sent out, but they sonic cleaned it and that's what it needed) and I set the choke. It seems to be loosing signal or power intermittantly. I'll be checking it out sometime this week.
Back to Top
backfoot100 View Drop Down
Platinum Member
Platinum Member


Joined: January-03-2007
Location: United States
Status: Offline
Points: 1897 		Post Options Post Options   Thanks (0) Thanks(0)   Quote backfoot100 Quote  Post ReplyReply Direct Link To This Post Posted: July-15-2013 at 5:38pm
Originally posted by TRBenj TRBenj wrote:

Originally posted by backfoot100 backfoot100 wrote:

When it's cold, remove the flame arrestor and look at the choke plate. It should only have 1/16"-1/8" gap from the choke horn. Any more than that and you'll have a terrible time keeping it running until it's warmed up.

Im not so sure, Eddie... my 2 best starting boats either have the choke disconnected or milled off entirely. Im not convinced theyre good for much at all, at least at the moderate temperatures I tend to boat in. Now HW may appreciate his, since he skis until the water freezes!

I have seen some EI modules do some very strange things, and I would wager a guess that is what he's dealing with. I had one that would lose spark at ~1500rpm... ran great at idle and if you go WOT out of the hole, would go great at 2k rpm on up. Easing the throttle up (or down) would result in an instant shut-down just off idle speed. So these things can be a little glitchy at times.


Interesting. Haven't heard of a good starting carbed engine cold without a choke (at least in standard holley configuration). Not saying they don't exist. I would be verey ineterested knowing if you had to do anything different to them after removing the choke. Could be some good conversation over a couple cold ones sometime.
My boat is terribly cold blooded until it warms up but that's only for a minute. Always has been. Before and after the engine build as well as a couple different carb rebuilds. It was really bad several years ago when I realized the choke was shot and I still lived in WI. Changing it helped immensely.

The EI doing weird stuff I can totally believe.
Back to Top
TRBenj View Drop Down
Grand Poobah
Grand Poobah
Avatar

Joined: June-29-2005
Location: NWCT
Status: Offline
Points: 21172 		Post Options Post Options   Thanks (0) Thanks(0)   Quote TRBenj Quote  Post ReplyReply Direct Link To This Post Posted: July-16-2013 at 8:22am
I wish I could explain why, but I tuned the 2 nice starters (skier and bfn) the same as the one that is cold blooded ('90). The first 2 never had functional chokes, so I can't compare the difference before/after. A few throttle pumps and they'll both about run at idle as soon as they start... The other wont let me run it below 1000rpm until the temp gauge is a bit over 100deg. Very strange.

What I really need is Tom (Gottaski) to give everything a once over!
Back to Top
backfoot100 View Drop Down
Platinum Member
Platinum Member


Joined: January-03-2007
Location: United States
Status: Offline
Points: 1897 		Post Options Post Options   Thanks (0) Thanks(0)   Quote backfoot100 Quote  Post ReplyReply Direct Link To This Post Posted: July-16-2013 at 11:53am
Originally posted by TRBenj TRBenj wrote:

The other wont let me run it below 1000rpm until the temp gauge is a bit over 100deg. Very strange.

What I really need is Tom (Gottaski) to give everything a once over!


Mine isn't quite that bad. A couple pumps and it fires right up and I need to keep it above 1000RPM for about 20-30 sec. Then I can ease it down to idle....and I mean ease it down. The whole process takes 45sec. to a minute. then it's good to go. Certainly don't have to wait until it gets over 100.
When the choke was bad, trying to keep it running for that first minute was a real lesson in futility.

Yes, Tom could make some nice extra cash doing some fine tuning on all our carbs.
When people run down to the lake to see what's making that noise, you've succeeded.



Eddie
Back to Top
Nauti87 View Drop Down
Senior Member
Senior Member
Avatar

Joined: June-05-2012
Location: Central Florida
Status: Offline
Points: 114 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nauti87 Quote  Post ReplyReply Direct Link To This Post Posted: July-20-2013 at 11:19pm
UPDATE,
I put my meter on the + side of the coil and the dist as a ground, 12.4 volts when running, when it dies I still have voltage. 13.4 at the battery when running. I put my meter on the + & - of the coil while running 4.3 volts, when it dies it goes to 0. That tells me that the EI is dying out. I think it would be an old Prestolite. What are your thoughts?
Back to Top
Nauti87 View Drop Down
Senior Member
Senior Member
Avatar

Joined: June-05-2012
Location: Central Florida
Status: Offline
Points: 114 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Nauti87 Quote  Post ReplyReply Direct Link To This Post Posted: August-03-2013 at 9:51pm
I replace the old Prestolite module with a Mallory module, so far so good!
1987 SN 2001 Barn Find aka "Nauti" (sold sadly)
1988 MC Anniversary Prostar 190
Back to Top
 Post Reply Post Reply
  Share Topic   

Forum Jump Forum Permissions View Drop Down

About CCF

Since 2003, CorrectCraftFan.com has been the foremost Correct Craft reference site, and simply provides the best used Correct Craft buying and selling experience anywhere.

Donate

This site is not affiliated with Correct Craft, Inc. Funding for the site comes from members like you. Click on the link below to make a donation.

Partners

Contact

Keith@CorrectCraftFan.com
Alison@CorrectCraftFan.com
www.CorrectCraftFan.com
Copyright 2024 | Bagley Productions, LLC