Interesting day. Ideas wanted.

[Dirtleg]

Well my wife's truck is in the shop for typical GM related issues (airbag light, TC light ABS light etc. No codes). She's been driving my 06' and I've been driving the 93. Last night we got up hay with the 93' and it was alot of hay. over 200 bales which I had unfortunately packed a little tight so they were heavy. (80 lbs each)Truck did fine last night no issues. Tranny temps stayed below 210*

This morning I got the flashing OD light and my speedo was inoperable. Truck was definitely in limp mode and my first thought was E4ODOA. But then I thought about the speedo issue and perhaps the trans computer was confused by a lack of data. I checked the speedo fuse and it was blown. So I replaced it with a new one and when I drove the truck it acted fine. No flashing OD button and normal shifts.

Could the lack of a speed reference throw the tranny into limp mode?

Next issue. Truck starts instantly and idles great. No smoke or weird smells. But after it's warm on the highway it pours blue smoke to the point of embarrasment. This just started. I am thinking the CDR is not working and crankcase pressure is causing the oil leaking, burning, seeping issue.

Appreciate your input on these issues.

 

[91f2504x4]

The last issue you described sounded like how my truck was acting when the air filter was stopped up. I think that lack of a speed sensor reference would definitely cause the trans to go into limp mode.

I just read that you said blue smoke, nevermind on my first comment, I must have skipped over that word when I was reading.

 

[GenLightening]

Yes on the speed sensor. Likewise if the tach, TPS, FIPL or any of their connections have ANY issues. Now you just need to find out why the fuse blew, or carry a bunch of spares just in case.

 

[DaytonaBill]

X2.

 

[Diesel JD]

Yeah I think 99% of the E4OD issues behind the IDI have to do with it being confused as it is an electronic computer controlled tranny trying to communicate with a mechanical motor. As far as your blue smoke my feeling is its probably fuel system related unless the rings or valve guides are flat out shot on your 93. The air filter and CDR are worth checking though. Are you noticing aggressive blowby and high oil consumption at the same time?

 

[Agnem]

Blue smoke is most likely an injector. See my avatar picture of the Moose Truck? That's what 3 bad injectors look like. An injector has mechanical moving parts, and tolerances change as metals expand or contract, so it is quite possible for one to work fine when cold, and not when hot, and viscaversa.

 

[Dirtleg]

Mel I believe you nailed it.

I was pondering this as I was driving it today. It is possible to drive it almost completely smokeless if you are super easy on the go pedal. If you are caught in the wrong gear or going up a good grade then you are smoking badly. It got me thinking about fuel delivery and specifically volume. I also noticed higher than normal EGT's and decreased mileage. I am thinking I have a bad injector on the drivers bank of the motor as that's where the EGT sensor is mounted.

Oil consumption is negligable. I haven't needed to add oil at all in 300 miles of heavy smoking. This would also point to a fuel issue.

I guess I will have to install the new injectors I was saving for the new 6.9. I have really got to finish that engine or I'll end up using all my new parts on this older one. Maybe I'll find some time this weekend. Been getting up hay or working on haying equipment constantly for 2 weeks. No time for much else.

 

[Diesel JD]

It might be just one bad injector. Time for a pop test! Are they original and all the same age you think?

 

[Dirtleg]

They all have International Grey on them so probably original and certainly due for replacement.

 

[Diesel JD]

They all have International Grey on them so probably original and certainly due for replacement.

I'd say they've done their job, with all the miles you have on that thing.