Joined: Aug 2007
Wednesday September 28, 2016 05:14
Joe theres a guy on a RV forum thats having trouble with his 6V92TA in a 93 foretravel coach Coach has no power here is what he has had done so far.
I mentioned check Air Box drain check valves not closing as per another posters recommendation, Do you have any input?
I've been noticing a loss of power since I had the top end redone last April. Turbo boost seemed to be getting lower and lower but today while climbing a big hill on I-70 in Missouri things really got bad. Now the best I can get is 5 psi. I pulled off into an RV park to work on the old girl. I am afraid to taker her back on the Interstate with the power so low. Does anyone have an idea of what can cause so much loss of boost.
As a little background, the boost measurement is via VMSPC. The turbo has normally had a maximum boost of 20 to 22 psi at 2200 rpm on long hills. Until today it had been running about 14 to 15 psi maximum but I had been doing OK and was going to be back to the mechanic that worked on it in November. Its too hot to take anything apart right now but all of the plumbing connection seem to be tight. The turbo isn't making any unusual noises. I can't hear any air or exhaust leaks. The engine is running very smoothly as normal. The engine temp was in the 170's and oil pressure normal. My guess is the DDEC, electronic engine control, may be the culprit but I would like it to be something mechanical that I can fix myself.
Has anyone had a similar experience or have any ideas of what could be wrong.
Well, still stuck in Danville, MO.
So far we have changed fuel filters, the air filter, checked fuel pressure (20 psi at idle and 70 psi at 2200 rpm), checked fuel restrictor in fuel return fuel line, pulled the boot and checked the turbo, tightened the exhaust manifold bolts and all turbo flanges, checked the DDEC and cleared any codes, also unplugged all electrical 12V and 110 for an hour to clear DDEC, checked the turbo boost sending unit and tightened the hose, checked the blower housing and the air box inspection plates for leaks, checked the accelerator pedal for full throttle and put in a double dose of diesel injector cleaner. My best guess right now is I got bad fuel from Loves in Booneville, MO or the turbo pressure sensor is bad or less likely may be that something is wrong with the super charger or the fuel line has partially collapsed internally but I doubt that I could get 70 psi at the secondary fuel filter if it was collapsed.
Sooo, if anybody else has any idea, please let me know. I'm going to try to get to Granite City, IL tomorrow. I was able to get the coach up to 62 today. Maybe its healing itself.
Edited: Thursday September 29, 2016 at 05:03 by stump