Problem near Albuquerque. Need help.
Fire doc.... (FL chassis, Cat 3126). For what it's worth, I had a similar type occurrence about six weeks ago when the engine derated but then cleared itself. We were able to pull codes with help from FL. We continued a few hundred miles with no problem, but stopped at a shop when we got to one. They called HEUI pump failure based on fault codes. We made an appt the next week for the expensive replacement, but then cancelled after I did some research and talking on my own. We are now in KY, another 1000 miles on, running smooth as a sewing machine.
The HEUI pump is a high power gear driven pump that pressurizes engine oil up to about 25-30000 psi, (yes, 30,000) and then uses that ultra high oil pressure to raise fuel injector pressure up to about 7000psi. Apparently there are several fairly innocuous circumstances that will cause symptoms similar to pump failure, thus generating fault codes and sometimes derating relating to fuel pressure. In our case we had been parked for several months, and I think the engine oil was somehow the culprit.
Now, if you're on a FL chassis, there is a way you can pull fault codes yourself. With key on (but engine off), and cruise control switch off, press and hold the CC Set button on the end of your directional signal lever. After several seconds the Check Engine light will start blinking in a numerical sequence representing the Cat engine fault codes. For example, 3 blinks, pause, 5 blinks, longer pause, 1 blink, pause, 7 blinks, end, would indicate fault codes 35 and 17. You can easily find a fault code listing online. Mine is a 2002, so may be different than yours, but if you call the FL Help Line (800 385-4357) they can tell you exactly.
John & Diane, fulltiming since '12
'02 DS, FL, 3126, '04 Element
John & Diane, Fulltimers. RVM103 NHSO
On the road since June '12 with Lincoln, the guard cat.
2002 Dutch Star 40, Freightliner, Cat 3126, 2004 Element