Rough idle at startup

[DanBarfknecht]

2006 5.9 Laramie Quad cab short box 118,000 miles. Lately on startup I see blue smoke and a rough idle. It clears up within a minute or so. Any thoughts?

 

[Ozymandias]

Factory injectors?
Factory fuel filter system?

 

[DanBarfknecht]

Yes, stock except for muffler and Detroit tru-trac rear end.

 

[Ozymandias]

I don't want to nail it but your probably in for a set of injectors.
The fuel filter system in our trucks back then was subpar - 7micron instead of 3micron that BOSCH demanded for their CRD System.
Chrysler cheaped out here which lead to high failure rates and wear to the injectors.
Which to weren't gold back then, Bosch did several revisions to the Injectors through the years too.

But a Diesel technician should examine it by the book to rule out every other possibility.
Injectors, and we talk about quality,not the 100$ eBay stuff, are expensive and no one should spend 2000$ without proper diagnostics before.

 

[slowmover]

2006 5.9 Laramie Quad cab short box 118,000 miles. Lately on startup I see blue smoke and a rough idle. It clears up within a minute or so. Any thoughts?

With that ultra-low odometer reading, how are you using it?

Infrequent use isn’t a friend.

What’s the Average MPH? (Engine Hours divided into Odometer Miles).

— Air & Fuel filters aren’t old in time or miles?

— Fuel in tank isn’t that old?

— Engine Sensors are original?

— Any engine oil consumption?

— Go thru Operator Manual Service Schedule and address items on Time not just Miles.

IOW, verify the stuff may be out of date you need to do anyway, first.

Injectors plus connector tubes plus miscellaneous is expensive.

— Proper tests on engine not optional. Just don’t ignore these other things if it just sits a lot.

Blue smoke ain’t good. But it’s cheap — and necessary — to address the lack of use and maybe aged-out components beforehand to keep good end results easier to obtain.

.

 

[p-Bar]

Blue smoke -oil ? Maybe a leakdown test is in order. Have the injectors tested at the same time. I think you need someone with the DRB III tool to do that.

 

[Ozymandias]

Blue smoke -oil ? Maybe a leakdown test is in order. Have the injectors tested at the same time. I think you need someone with the DRB III tool to do that.

AutoEnginuity is the other possibility if a DRBIII isn't in reach.

 

[jghflys]

AutoEnginuity is the other possibility if a DRBIII isn't in reach.

What year models does AutoEnginuity work on?

 

[Ozymandias]

Mid nineties when the OBD2 standard was set and established.
I bought mine in 08 to work on my 98 Grand Cherokee, now I use it with my Ram and I also used it on my buddies 98.5 Ram.

 

[DanBarfknecht]

Took it to diesel specialists of Green Bay wi.
Fuel pump in tank was coming apart, metal shavings in fuel filter. They replaced that tank pump, rail pump and injectors, flushed fuel tank. $7,000 later it runs great. Yikes.

 

[Rowdy Dalton]

Took it to diesel specialists of Green Bay wi.
Fuel pump in tank was coming apart, metal shavings in fuel filter. They replaced that tank pump, rail pump and injectors, flushed fuel tank. $7,000 later it runs great. Yikes.

Ouch.

 

[253]

I had same problem, one injector was leakin after shuting off the engine,, replaced the bad one, now its all good,, have a repair shop isolate the bad injector.