3.0L still cuts out after replacing almost everything all my searching has told me to

[achris]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

My preference is an old needle style dwell meter. Much easier to see fluctuates than on a digital.

 

[tshaw84]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

Lol i got a digital before i read this....im out here now and it stays right at 30...does not move around at all...

 

[achris]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

That tells us 2 things, you got power to the points, and the point dwell is correct.... (Spec is 28 to 34)..
Did you check the timing?

Chris.....

 

[tshaw84]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

That tells us 2 things, you got power to the points, and the point dwell is correct.... (Spec is 28 to 34)..
Did you check the timing?

Chris.....

Yes timing is set to the 6 degree spec...

I am totally lost...sounds like it has a miss every 2-3 seconds...and while looking in my manual i found a receipt from the previous owner for the fuel pump in 1997...

 

[tshaw84]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

Also...just sitting here in the driveway its idling between 530-580 using the digital meter...

 

[achris]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

Sounds like it's 'back to basics' time...

Let's assume nothing... Start with a compression test. Verify everything. Check the spark plugs are gapped correctly, that the plug wires are going to the right plugs and they are plugged into the right holes in the dissy cap....

 

[Fishermark]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

Did you run it on a remote fuel tank yet? Again - this helps narrow down where the problem is coming from.

 

[Don S]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

When you checked your dwell, did you rev the engine to see if it changed? Rev it up to 2500 -3000 rpm and see if you still show 30? dwell.

 

[tshaw84]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

Fishermark- I have yet to have a chance to get it on the remote tank yet, last night was the only time I found to get working on it unfortunately, hopefully today or tomorrow I will have a chance to do that, about that tank, I can just use a regular 5gallon gas tank right? I don't need to go out and buy something fancy do I?

Don- while checking the dwell, I check it at idle, then I put it about 1200, then again at 2000, and it was 30 at all places...

achris- Only thing that you mentioned, that I have done yet, due to lack of tools, is check the compression.


I started looking into carb adjustment last night, Mine has 2 screws, which is not what it shows in my manual. Being familiar with other carbs (not sure how similiar they are) I noticed that the screw to the left, was only a little less than one turn out, and the screw on the right, was probably backed out about 3-4 times, which both seemed a little crazy to me. From past experience with other things, I shut the boat off and turned them both all the way in and backed them both out about 2 1/2 times. boat started right up and idle seemed a little rough, but revved up VERY smooth (but in the driveway). I know I will have to reset the timing, but unfortunately I lent my timing light to a buddy this past weekend. so I will have to do that tonight.

Any Idea if this would have caused the 1900-2000 failure? Seems this definitley could have been the cause of my lower than normal RPMs...


btw, I appreciate all the help you guys have been giving me.

 

[tshaw84]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

One other side note, before I forget. Kind of off the subject, but my fuel gauge hasnt been working, someone told me sending unit, but when I get down there with a meter, I am getting around 7.45v, which I assume should be reading a little over 1/2 tank on the gauge?

I am not entirely sure how they work, but I think the sending unit gives off a different amount of resistance which in turn gives me my reading on the gauge, a full 12v should read full, 6v half and so on? I am sure those numbers are not right, but just to make my point...

which brings me to my questions, is there a better way to check this...Should I post this somewhere else? I dont want to side track from my main problems, I just figured I could kill 2 birds with one stone...


Thanks!

 

[achris]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

One other side note, before I forget. Kind of off the subject, but my fuel gauge hasnt been working, someone told me sending unit, but when I get down there with a meter, I am getting around 7.45v, which I assume should be reading a little over 1/2 tank on the gauge?

I am not entirely sure how they work, but I think the sending unit gives off a different amount of resistance which in turn gives me my reading on the gauge, a full 12v should read full, 6v half and so on? I am sure those numbers are not right, but just to make my point...

which brings me to my questions, is there a better way to check this...Should I post this somewhere else? I dont want to side track from my main problems, I just figured I could kill 2 birds with one stone...


Thanks!

The way to check fuel senders is by resistance, not voltage. You may need to pull the sender out of the tank to do this test. Usually they are 33 to 240 ohms. At full the sender should read 33 ohms, and at empty 240 ohms... Other than that, no other test...

Chris......

 

[achris]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

..I started looking into carb adjustment last night, Mine has 2 screws, which is not what it shows in my manual. Being familiar with other carbs (not sure how similiar they are) I noticed that the screw to the left, was only a little less than one turn out, and the screw on the right, was probably backed out about 3-4 times, which both seemed a little crazy to me. From past experience with other things, I shut the boat off and turned them both all the way in and backed them both out about 2 1/2 times. boat started right up and idle seemed a little rough, but revved up VERY smooth (but in the driveway). I know I will have to reset the timing, but unfortunately I lent my timing light to a buddy this past weekend. so I will have to do that tonight.

Any Idea if this would have caused the 1900-2000 failure? Seems this definitley could have been the cause of my lower than normal RPMs...

Those engines were released with either a Rochester or a Mercarb, the distinguishing difference is the Mercarb has 1 idle mixture screw and the Rochie has 2. But looking in the manual for the 1985-1989 I (like you) only see the Mercarb (but the parts manual shows both... weird), which may indicate that someone has put a Rochie on that engine in the past... See if you can find a number on the carb and I might be able to identify where is came from... (Should start with 13....)

As for the idle mixture screw settings... they should both be set the same, but once the engine (under load) is over about 1500 revs they are no longer part of the fuel system, so have no effect on top end revs... sorry.

Chris........

 

[tshaw84]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

Alright, I am at work now, but might be able to get a number off the pictures I took a while back. I will see what I can find out.

 

[fat fanny]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

My $'s on a fuel delivery issue pickup tube screen,vent or anti siphon valve!

 

[tshaw84]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

My $'s on a fuel delivery issue pickup tube screen,vent or anti siphon valve!

Tank vent is good, not sure what "pickup tube screen" is and I haven't replaced my anti siphon valve yet...

I hate to ask, but does that come right off the sending unit? I have read that I should change that, but have yet to do so.


Also, I forgot to grab the number off my carb, I did go out last night fishing and was back to idling rough again, had a low idle, maybe 350-400 while in the water, I won't be able to do the remote tank until the weekend, but I will stop somewhere and grab an anti-siphon valve this week. Are they typically universal?

 

[hoot]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

I would suggest starting the boat at night and look for stray ignition sparks from the wires or coil. And I would replace the ignition coil, maybe the wires also.

 

[danielw71]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

As a dear friend of mine says, "Everything has something to do with everything."
I don't know if it will solve your immediate problem, but a full tune up is always helpful. Be sure to look at the sticky at the top of the page which describes in detail how to tune up an engine with a points ignition. In addition, be sure to check the total timing - maybe your advance weights in the distributor are binding.

Google is your friend!
Having said that, yesterday someone posted a link showing a tool that combines it all into one tool: Timing light / dwell meter combo.

I ran into this there was some old grease that was tacky and the weights were not moving correctly once I cleaned it up it worked fine.

 

[tshaw84]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

I ran into this there was some old grease that was tacky and the weights were not moving correctly once I cleaned it up it worked fine.

Those are underneath the points/condenser correct? I will check those out tonight.

 

[achris]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

Those are underneath the points/condenser correct?....

Correct.

 

[fat fanny]

Re: 3.0L still cuts out after replacing almost everything all my searching has told m

The pick up tube screen is at the end of the pick up tube that goes into the tank and that hole tube feeds the line that goes to the fuel pump at the top of that tube is generally the anti siphon valve u can remove it and make sure the ball and sometimes spring are moving freely along with not having any blockage from debri .