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Person Is Selling A 1985 Silverado 3500 4 Door Dually With A 6.2 Diesel. It TurnsOver but No Start?

I understand where some of the above replies are coming from about being a lemon........but we are talking about a $900 30 year old truck here. Even if the engine and trans are complete junk there isn't a whole lot of risk involved here. Regarding it having a "new" engine and trans you just never know. A lot of people get a junkyard engine, slap it in a vehicle, and say it is "new". On the other hand I have seen people spend a lot of money on new crate engines and stuff for a project, get tired of it, let it sit around for a few years, and then sell the stuff for pennies on the dollar.

Back to the 6.2, as mentioned below it is really easy to diagnose a no-start condition on one of these. The problem is that most people, even experienced mechanics, simply don't know the basics of a diesel. While simple it is a lot different than a gas engine.

Fuel - if the thing has been sitting for awhile a very good chance there is air in the lines. Without bleeding the system the truck will take a very, very long time...I'm talking draining the batteries several times....to start, if it even will. Also, old diesel tends to grow stuff and clog up the filters and such.

Glow plugs - my 6.2 doesn't like starting without the glow plugs working even if it is warm outside, never has even when it was only 4 years old with 49k on the odometer

Battery - these things have to have enough battery oomph to spin over the engine a certain speed, and why they came with dual batteries. Ran into a starting issue many years ago in which the thing would crank over for a decent period of time but never start. Checked a bunch of things out at first but finally figured out one battery was good and one was going bad. It had enough reserve capacity to crank the engine over long enough where it didn't really seem like a bad battery, but wasn't getting enough amps to spin the engine fast enough. New batteries and the thing would fire within seconds of hitting the key.
 
6.2Blazer said:
I understand where some of the above replies are coming from about being a lemon........but we are talking about a $900 30 year old truck here. Even if the engine and trans are complete junk there isn't a whole lot of risk involved here. Regarding it having a "new" engine and trans you just never know. A lot of people get a junkyard engine, slap it in a vehicle, and say it is "new". On the other hand I have seen people spend a lot of money on new crate engines and stuff for a project, get tired of it, let it sit around for a few years, and then sell the stuff for pennies on the dollar.

Back to the 6.2, as mentioned below it is really easy to diagnose a no-start condition on one of these. The problem is that most people, even experienced mechanics, simply don't know the basics of a diesel. While simple it is a lot different than a gas engine.

Fuel - if the thing has been sitting for awhile a very good chance there is air in the lines. Without bleeding the system the truck will take a very, very long time...I'm talking draining the batteries several times....to start, if it even will. Also, old diesel tends to grow stuff and clog up the filters and such.

Glow plugs - my 6.2 doesn't like starting without the glow plugs working even if it is warm outside, never has even when it was only 4 years old with 49k on the odometer

Battery - these things have to have enough battery oomph to spin over the engine a certain speed, and why they came with dual batteries. Ran into a starting issue many years ago in which the thing would crank over for a decent period of time but never start. Checked a bunch of things out at first but finally figured out one battery was good and one was going bad. It had enough reserve capacity to crank the engine over long enough where it didn't really seem like a bad battery, but wasn't getting enough amps to spin the engine fast enough. New batteries and the thing would fire within seconds of hitting the key.
Click to expand...

All good points. :waytogo:
 
rjfguitar said:
It probably just has a dirty cap and rotor from sitting. Either that or the float is stuck closed in the carburetor and won't let diesel flow into the bowls. Might also be a programming issue with the TCM.
Click to expand...

:what: We're back to canooter valves and blinker fluid?
 
hell, you can part it out and make $$ with it...
 
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