lraffe1 Posted August 3, 2010 Share Posted August 3, 2010 I have a customer blow the head gaskets on his 6.0 in oklahome. His brother went out with 6.7 and a 6.0 on a trailer to haul his truck back and pull his trailer back. when they were coming back the cel light came on in 6.7 and it could not not keep up with 06 6.0. they both were grossing around 23,000. the 6.7 was only getting 5.8 mpg, which i understand there is many variables in mpgs. I found p2459, p24a2 in memory, and on-demands all pass. freeze frame data showed truck was going into regen every 58 miles but averge is 185 now. I contacted hotline and checked several things. I verfied maf is same as like truck, power balance is good, relative comp is okay, and fuel trims are okay. I then verfied dpf reads 0 koeo and does not rise above .8 psi at idle. I then preformed manual regen. After regen i used maf to verfy egr is shutting. this was proceder from hotline (Disable the DFCM using IDS and monitor the MAF_A during cranking. A reading of 8.5-9g/s indicated no concerns. A reading of 5-6g/s indicates a possible leaking EGR poppet valve. A reading of 2-3g/s indicated a base engine concern). I got a reaing of 11 g/s. I then reset scr and dpf and test drove. I feel truck seems to hestate compared to a pickup, but this is only chasis cab i have driven. I not sure if the trucks using two different turbos could be causing this. Hotline thinks customer got dpf plugged from short drives and idle time. Which I have encontered many times with 6.4. However, if that is tha case i find it hard to understand why it didn,t act up sooner. It seemas old that truck made it from ohio to oklahome and then started acting up on way back. has any one else ran into this problem. Quote Link to comment Share on other sites More sharing options...
Aaron Posted August 3, 2010 Share Posted August 3, 2010 2274 - 6.7L DIESEL - TURBO PERFORMANCE CHARACTERISTIC DIFFERENCES BETWEEN F250/F350 AND F450/F550 SOME CUSTOMERS WITH MULTIPLE 2011 F-SUPER DUTIES MAY REPORT THAT F450 AND F550 CHASSIS CAB 6.7L DIESEL EQUIPPED VEHICLES MAY EXHIBIT A CHARACTERISTIC TURBO LAG WHEN ACCELERATING FROM A LOW ENGINE SPEED WHEN COMPARED TO A F250 AND F350 PICKUP VEHICLE EQUIPPED WITH THE 6.7L DIESEL ENGINE. THIS IS PRIMARILY DUE TO THE DESIGN DIFFERENCES OF THE TURBOCHARGER AND AIR INTAKE SYSTEM. CHASSIS CAB VEHICLES USE A STANDARD VARIABLE GEOMETRY TURBOCHARGER WHILE PICKUP VEHICLES USE A DUALBOOST TURBOCHARGER AND HAVE DIFFERENT HP AND TORQUE CURVES. REFER TO THE 2011 F-SERIES SUPER DUTY 6.7L POWER STROKE DIESEL ENGINE 'COFFEE TABLE' BOOK, LOCATED ON THE PTS WEBSITE, FOR ADDITIONAL ENGINE SPECIFIC INFORMATION AS NECESSARY AND COMPARE TO A LIKE UNIT, AS THIS MAY BE CONSIDERED 'NORMAL', PRIOR TO PERFORMING ANY DIAGNOSTICS. Hope this helps some! Quote Link to comment Share on other sites More sharing options...
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