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86 Coal Burner ...

Next time it wont start, check for 12v at the fss (big wire on top of pump). if there is 12v there, remove and install the wire and listen for a heavy click.
 
does the fss click when power is put to it? Seen way more crappy fss than metering valves sticking shut. The fss holds the metering valve shut to kill the engine, so the metering valve could be sticking, just not real likely.
 
I don't know ... there is power there, but hard to hear the clicking by myself , while I'm in the burb cranking it, or do you mean just turn the key on , get out and listen ?
 
with key on, remove and install wire, you should hear/feel a heavy click from inside the top cover of the pump.
 
I didnt read your testing closely enough, if a small squirt of starting fluid made it start quickly and easily, it sounds like you are dealing with a glow problem.

When it wont start, do you have smoke at the tailpipes? It cranking speed is good, there will be a fair amount of smoke within 10 seconds cranking.
 
onedaatmc said:
yes theirs smoking at the tail pipe... 4 of the glows work ... I had heard you don't need all of them ?
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No. 4 is not enough, even in the summer time. Dropping down to even 6 plugs has a noticeable effect on startability (summer or winter).

What is the ambient temperature when you're struggling? That is the largest factor in how much plug heat you need.

If you're able to keep it running afterwards I don't think you have a fuel delivery problem. A stuck valve (at any point in the fuel circuit) would not enable you to continue running after you did the ether start. Sorry if I didn't express that clearly enough earlier.

Smoke at the tailpipe, hard starting...sounds like a plug issue to me, too.


Are you confident that the plugs are (always) getting 12V?

FWIW, I have 3 of these trucks. All of them have had glow plug controller failures. The one I'm dealing with today has gotten to a point where the controller no longer clicks the GP relay. So it acts like it's cycling, but no power gets to the plugs. And it started off as an intermittent problem (like yours). It will soon be using a manual switch for glow plugs. Like the other 2 now are.

I share this to point out that a pesky GP controller can cause the symptoms that you are dealing with. Even the intermittentness.
 
onedaatmc said:
yes the problem is it won't start.... when we cracked open the turbo pipe and squirted either in there, we disconnected the plug for the glowplugs so it wouldn't "explode" ... before the squirt. once it started and very rapidly , meaning it didn't cough, cough cough , it was running right now, then that told my friend its not a glowplug problem... so I guess it had run enough and warmed enough to then reconnect the glowplug connector to then turn the key again and let it cycle with the glowplug light on ... and it fired right up ...
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Upon re-reading this, I'm pretty confident that your friend is wrong. That behavior is exactly what I would expect if the GPs were non functional. Engine works when running, starts when warmed (even a little is enough), but no fire when cold. I don't think a metering valve can cause that, nor do I think the engine would have been able to run normally with it stuck shut. I think you would have had noticeable responsiveness issues if it was acting up or sticking.

The metering valve is what sets the amount of fuel going into the engine (diesel equivalent of a throttle valve...kinda), so any malfunction there would either prevent operation or at least affect operability. I presume you would have mentioned if you were having either of those conditions.
 
well low and behold ... I went out this morning around 10 am , just to see it it would start , I hit the manual glow plug controller for 10 sec, then turned the key and let the factory one cycle once ... since I've owned it , it would still take 4 or 5 cranks before it would kick over ... today it started immediately !!! so it must have had some gunk that got dislodged the 2 days I ran it with the standadyne in it ... cause now it started immediately like said. as far as the temp it started at , it was about 40 degrees...
 
Fix all your glow plugs. You wouldn't put in 3 new spark plugs in your Toyota. I suspect I have one bad glow plug and it makes a noticeable difference. When they are all good I have had it start at -2 and setting for weeks with just the glow plugs.
 
blazinzuk said:
Mine would start with 3 glow plugs working anything over about 45.

It's got over 350k on it:dunno:
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Interesting. I have tried less ambitious goals with my engines and failed. :dunno:

You did say you have a higher cranking speed than my stock (little wire) setup. That probably helps.

I might hafta try this again just to see what it can do. :thinking:
 
Yah my cranking speed is very good. It makes a huge difference. Newer starter batteries solid and #0 wire
 
blazinzuk said:
Yah my cranking speed is very good. It makes a huge difference. Newer starter batteries solid and #0 wire
Click to expand...

I'm kinda getting a taste of that with the 24V CUCV starter. It's not even the MT28-style starter, but it's a noticeable improvement over the stock setup.
 
black dawg said:
I didnt read your testing closely enough, if a small squirt of starting fluid made it start quickly and easily, it sounds like you are dealing with a glow problem.

When it wont start, do you have smoke at the tailpipes? It cranking speed is good, there will be a fair amount of smoke within 10 seconds cranking.
Click to expand...

yes smoke in the pipes and cranking speed is fast ... seems like its the glow plugs issue ... or lack there of ! So the other day , It wouldn't start, so I tuned the key on and let it cycle through the glow plug sequence, 3 times before starting ... it started right up ... so I assume it's just doesn't have the fuel warm enough to pop and start ....I almost took my heat gun to the engine near the injection pump and the then the glows to prewarm the engine .... which may be dumb ... but just trying to figure out .... I know your thinking just replace the glows ... well ok , when I have the time, but also I'd bet they've mushroomed the tips and have broken off inside on the ones that don't work ... I just have to find the time to get to it ... 12 hrs working every day for work makes fixin' the burb , low on the list ... but do want to ... anyway thanks for all your suggestions, folks !
 
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