Help! Isuzu broken down (again)

[IGBT]

We fixed our injector problem in North Dakota by having two injectors replaced, but now our 2006 Isuzu NRR 5.2L 4cyl diesel has an engine light again.

It is throwing code P238, which has to do with turbo high pressure sensing. It does this right when you crank the engine and erasing the code has it pop back up immediately.

The truck runs, we drove it 120 miles, but the top speed is now about 50mph and it can barely go up hills. Admittedly it was never speedy with our 18,500 pound load but it was able to do 65 or 70 on a flat.

We are near a truck shop in Dothan, Alabama which does work on Isuzu but this would involve removing both pods from the flatbed, which takes a couple of hours, then a couple hours to re-pod. If this is just a boost sensor, loose cable, or something that I can get to myself, it would save us a ton of work.

Any ideas?

 

[kerry]

This lists 7 possible causes, one of which is a loose connection in the wiring. I'd at least check that.

http://www.autocodes.com/p0238.html

 

[IGBT]

This lists 7 possible causes, one of which is a loose connection in the wiring. I'd at least check that.

http://www.autocodes.com/p0238.html

I had seen that link but I am not sure of the specifics to the Isuzu 4cyl engine. I was hoping someone might have had a similar problem and would know the location and voltages to check?

 

[SkiFreak]

Computer controlled equipment is arguably superior to manual systems, but when it goes wrong it can be a royal PITA!!!
Sadly, automotive technology will likely never go back to the simplistic systems they once were.

 

[kerry]

In thinking about it, it can't really be high turbo boost if it happens right when the engine starts so it points to a bad sensor or bad connection.

 

[fluffyprinceton]

In thinking about it, it can't really be high turbo boost if it happens right when the engine starts so it points to a bad sensor or bad connection.

This

 

[IGBT]

FIXED! (Help! Isuzu broken down)

We fixed the problem ourselves (it was quite easy).

Instead of removing the pods from the flatbed, we decided to try raising the living pod high enough to tilt forward the cab. It worked great and only took a few minutes (mostly to dig out the jacks from the truck boxes and plug them into the pod sockets). It seems that raising the pod about 10 inches off the flatbed was just right for tilting the cab and it not hitting the overhang.

Once the engine was exposed the problem was extremely obvious. The boost sensor wires were all frazzled (the red and white totally torn through, ground was nicked). Squirrel or mouse or just vibration? Anyway, I broke out the soldering iron and heat shrink, performed some surgery and she seems to be running fine now with no codes. $0 spent. When does *THAT* ever happen?

Truck kind of looks like a transformer here:

 

[SkiFreak]

Anyway, I broke out the soldering iron and heat shrink, performed some surgery and she seems to be running fine now with no codes. $0 spent. When does *THAT* ever happen?

It happens when people make an effort to do maintenance or repairs themselves, opposed to taking their truck to someone else.
The bonus of this approach is that you know exactly what work has and has not been done.
Good job!

 

[kerry]

Great news. Almost always better to do it yourself if you can, if for no other reason than educational ones.

 

[kerry]

Are you towing a sailboat?

 

[IGBT]

Yes, a Montgomery 17.

We just finished sailing it off the coast of Florida.

 

[Saharafire]

I live close to Dothan. Small world haha.

 

[kerry]

Did you sail with the West Coast Trailer Sailing Squadron? They do a lot of nice trips on the west coast of Florida. We're considering towing our Sea Pearl 21 Tri down to the Gulf Coast of Texas in late January.

 

[IGBT]

We sailed out of Carabelle, FL on the gulf side and Saint Augustine on the Atlantic. Solo though, not with any group.

We will also be heading to Texas gulf area to sail this January. Have not picked an area yet, but maybe Rockport?

 

[kerry]

Rockport is nice. We have our eye on Port O connor. There's a state park out on the barrier island only accessible by water. Army Hole is the name of the anchorage there.