I need some desperate help! We are on vacation in , we are in Bayfield right outside of </FONT><?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-com[img] /><st1:State>Colorado</ST1<IMG class=inlineimg title=[/img]la</st1:State><font face=" /><st1:State><ST1<FONT face=Arial>Durango</FONT></ST1</st1:State><FONT face=Arial>. I am pulling a 35' FW. In </FONT><st1:State><FONT face=Arial>New Mexico</FONT></ST1</st1:State><FONT face=Arial>, my truck started acting up. The SES light came on. We pulled into a parking lot and it went off. We went on and it kept doing it, especi</FONT><st1:PersonName><FONT face=Arial>al</FONT></st1:PersonName><FONT face=Arial>ly when pulling up a long grade. It got to where it was de-fueling and would run very rough. When I got a fuse to replace the blown one in the data link circuit, I checked the codes. The only one that was in it was P1211. We went on and it seemed to get worse. I put it back to stock to see if that would help, it didn't. I unplugged the ICP (that is the one screwed into the head right?). At first I thought it did better but it started doing it again. It acts like a fuel filter clogged, when you stop it for a while it will get better until it has to start pulling hard. I pulled the top off the filter and it looked clean as a pin. I changed it before I left. I got up this morning and checked the codes again and it had P0198, P0603, P1211 and P1280. I assume the P1280 was from unplugging the ICP, and maybe the P1211?</FONT>
<FONT face=Arial>Anyone got any ideas?<O</O</FONT>

<O</O

<FONT face="Times New Roman"><FONT size=3>Thanks!</FONT></FONT>

Steve

 

I can't really help you too much but here is a site that lists what the codes are. Hopefully Alan or Kwik will be along today and they can give you a little troubleshooting help.

http://www.freeautoadvice.com/diesel/pscodes.html

 

P0198 EOT Sensor Circuit High Input

Sounds to me like your truck was defueling from this. Most likely the Engine Oil Temp sensor was sending a signal to the PCM which made it seem like it was running VERY hot, at that time which it defueled.

P1280 ICP Circuit Out of Range Low

This was from unplugging your ICP sensor. Plug it back in

P1211 is normal for a chipped truck, and so is P0603.

 

What blew that fuse?
The tin nut on the IPR may be loose.
I see you have fixed your tank pickup so that eliminates a clogged filter.
Does it pull better at lower rpms?
Did you put a pre-filter between the pump and the tank?
There is a screen inside the inlet of the fuel pump that will clog badly (personal experience) and cause a big power loss during high fuel demand like towing.
And again, what blew that fuse?

 

I have plugged the sensor back in. The first code was the P1211, I figured that was because of the program. Will that one cause the SES light to come on?
It does seem that it could be the EOT sensor because when I stop and let it cool it will do good for a while. I checked the oil when I stopped once and it did not seem hotter than normal. Is there any way I can check it? Where exactly is it located?

Kwik, I don't know exactly what blew it, but my wife had the computer plugged into it earlier. And I use it to re-charge my flashlight also. I wouldn't think the computer would draw enough to blow it. The plug on the IPR seemed to move around when I checked it, that may be normal though. No I didn't put a pre filter in. The fuel bowl was full when I checked the filter. How hard is that screen in the inlet of the pump to check?

Thanks Everyone!

 

EOT: A problem but not one that will cause what you are talking about (see the "Detection/Management" Line)
Sounds like the HPOP cant keep up with demand ie 1211 and 1280. Go back to stock tune and see if the problem is still there.

 

I am 99.43% sure that the EOT sensor is the one that is to the lower right of the ICP sensor, circled, in this picture.

 

Go ahead and take that other 0.57% Kris ...............thats it.

 

Alan do you think that's at fault?

 

No, if the sensor is detected out of range the PCM uses a value that will let the truck run (212*F running). I think he is getting a 1211 & 1280 due to the HPOP not being able to keep up with the demand the tuner is calling for.

 

I set it back to stock and it does the same thing. The codes I posted came after I set it back to stock. Only thing the change to stock did was reduce the power when it was running OK. After it sits for a while it will run OK then start acting up again, even when it is not pulling hard.

Thanks Again Guys!

 

Is there any oil in the ICP sensor connector?

You will need to replace the EOT sensor, if it is only marginally bad (biased) it could be reading 10-20 degrees hot but, not out of range. This could cause a change in fuel mapping as the PCM thinks the truck is about to overheat. Also if the PCM starts to defuel because it thinks the truck is overheating the PCM could interpret the drop in ICP pressure as a fault and giving you the 1211 & 1280.

For a test unplug the EOT and see if it still does it. unplugged the PCM will use a default of 212* when running.

 

Remove the quick connect from the rear of the pump and look inside. Borrow your wifes hand-held make up mirror or go buy a cheapo one, you'll need it unless you want to remove the pump altogether. You may need to find a way to get the fuel to drain out. You should see a fine screen. If you see a bunch of sediment, you've found your problem.

 

There is no oil on it. I am thinking the EOT sensor also. I will check on a price tomorrow when thing open up. I wish I had unplugged it when it was running bad.

I may try and check this tomorrow.

Thanks!

 

Update! I replaced the EOT sensor for $30. Thursday we left Bayfield, Co. for Colorado Springs, went over Wolf Creek pass at almost 11,000 ft, no problem. It sailed right over it. Later in the day right outside of Co Springs, I blew the line to the boost gague out and it acted up a little, put it back in and it is doing fine now. I have got to fix that cheap hookup for the gague. It has the little boot that came with it and it doesn't work well. Thanks everyone for all the help! Maybe I will make it back home OK!