having trouble starting 6.2 diesel

[gold84gmc]

what do you mean crack open? you mean loosen them to see if fuel leaks out?

[Captkaos]

Lets start at the beginning:
When the Glow plugs come on does the voltage drop?
Have you metered all the glow to see they are getting 12V?
If necessary, pull the glows out and ground the threaded section and then let it cycle.  They should turn dull red when power is applied.
If all this is ok, then loosen an injector fitting and crank at full throttle for 10-30 seconds.  Fuel should come out the loosened fitting.

Check all this out and report.

[gold84gmc]

im not gonna bother doing anything to it...im just gonna sell it...but thanks everyone for the help

[Irish_Alley]

don't give up man, its probably something real simple as much work and money you put into it all ready your all ready dedicated to it.

[gold84gmc]

i already know that its just going to be problems down the road and since i dont know anything about diesels i probably wouldnt be able to fix it and i dont have the money to bring it to a garage....i know now that the only diesel ill get is a duramax, or cummins

[fitz]

What kind of shape is the truck in? You could always get a $300 parts truck off Craigslist and put a gas motor in it.   

[gold84gmc]

its got quite a bit of rust....and i dont have the money to get a parts truck and i kinda need a truck now

[Whitfield]

Not trying to direct you from here as these guys are great  

But for diesel tech you should visit Steelsoldiers.com and check out the CUCV section.  All 6.2L Diesel tech all the time / parts too! .  Very knowledgeable 6.2L diesel tech in their.  They dumb it down enough where even I can follow along.  

I seem to recall something about a check ball that gets trash in it and sticks when the pump begins to fail.  But I am no diesel tech ~ Just a 6.2L CUCV wann~be!

Cutting off after start sounds to me like a fuel issue ~ because the 6.2L diesel can kill the alt and drop the batteries out but will still keep on running once started.

That 6.2L is a nice truck with great MPG.  Is yours 4wd / x-military / 1-ton?

[gold84gmc]

if i wasnt in a hurry to get this going then i would deffinatly keep it and fix it, but it was supposed to be my daily drivers

if it was a fuel problem then i thought it would never start because it wasnt getting fuel?

and mine is a 1500 4wd

[Whitfield]

Seems to me your hard start could be fuel related too. 

Trouble getting proper fuel psi,  Crank engine until it builds enough PSI to start, then loose it while running.

I am no diesel tech and am darned near mechanical pump illiterate ~ just a laymans logic.

Lines / Pump / Check valve  ~ ~ ~ ~ ~

[Irish_Alley]

if you haven't gave up on it yet try a couple things i have found from a web site

http://www.dieseldoctor.com/messageboard/data/231.html
Message:

If you are having a hard starting problem with a 6.2, and you have a mechanical lift pump, replace it. It is cheap, and is very often the problem. I replaced mine with a $40 autozone electric pump, and it solved a couple of my problems.

Also, if you suspect your glow plugs, let them cycle on and off several times BEFORE cranking. Did it start any easier...even a little? Then replace them.

If you are going to replace your glow plugs, do yourself a favor, and make a special removing tool out of nut that is the same metric size and pitch. I can email the simple instructions. Do not break the tips unless you are really sure you won't drop it in there.

steliz1 at hotmail dot com





Message:
I agree about the electrical. Just because it's turning over does not necessarily mean it's turning over fast enough to fire. These babies have huge starters that are very prone to being cranced too long and then getting fried. I have learned this the hard way. I made the ever fatal mistake of running out of fuel and in the process of trying to get it started again, I fired the started. And I NEVER crank longer than 10 second. Usually only about 6 seconds. Anyhow, it would turn over and my brother-in-law was sure the starter wasn't the problem, but I took the starter off anyhow and had it tested and it would spin, but the load would bury the needle! So charge the batteries to 100%, clean and replace terminals as necessary and if it still won't start, pull the starter and have it tested. I SERIOUSY doubt there is anything wrong with your valve train. When you bled the injectors, you had help turning it over and closing it when it began to weep? All 8? Also, The timing line that is stamped on your timing cover was set for the original injector pump. It is not a true indicator of timing. Also, I just recently performed a similar operation on one of my trucks (replaced timing chain.) When I put it back together, I of course alighned all the timing marks on everything, but the timing none the less was VERY, VERY retarded. So much so that I had to open it all up again and move injector pump timing gear ahead tooth by tooth until it was in time. I have never seen this before...

[fitz]

WD40 yes
Starting fluid/Ether NEVER!

  Unless your about to sell it to someone who calls you a friend but instead of helping you fix the truck offers to buy it(for cheap money I assume). Ya, in that case I would break the cardinal rule of diesels and load it up with ether and give it a shot.
  What he doesn't know won't hurt you.
  Hopefully you haven't given up yet. Others have given you some good advice,hopefully some of it pays off. Like others said, it may be a simple solution.
  I had a camaro years ago that I could not get to start. I went over all of the basics.
  Fuel (brand new Holley carb and fuel pump)
  Air (new edlebrock air cleaner)
  Spark (new accell plugs, wires,cap and rotor)
  I worked on it every night and it just would not go. It was getting a spark, but a more experienced eye noticed it was a weak spark.
  A $20 pick up coil had me burning rubber all over town.
 

[Irish_Alley]

im kind of leaning to the starter

[Whitfield]

Agreeded ~ Starter / connection / high amp draw / low battery CCA issue, but the starter wouldn't make it cut off after 10 - 15 sec.

I think he has multiple issues that are muddying the waters.

[Irish_Alley]

eather way your "friend" i bet he knows what the problem is, think about it like this would you buy a pos from a "friend" that doesn't even run??? tell you what rec a vid of you trying to start it so we can at least hear whats going on