LOW-SPEED MISS

Diesel Power - - Top Tech Questions - C.W. Baines via In­ter­net

QUES­TION: My ’06 Ford’s 6.0L Power Stroke diesel en­gine mis­fires on nor­mal ac­cel­er­a­tion and when cruis­ing along at lower rpm and up to 40 mph. Run it hard and all seems fine. There are no di­ag­nos­tic trou­ble codes ac­cord­ing to the ser­vice tech­ni­cian at the Ford deal­er­ship I take it to for ser­vice. I bought the truck used with 64,000 miles on it be­cause it “had just been bul­let­proofed,” ac­cord­ing to the Ford pa­per­work. The prob­lem is con­cern­ing, as I thought I was get­ting a trou­ble-free truck. AN­SWER: If your truck’s en­gine has a mis­fire un­der light throt­tle or steady cruise at lower rpm, it should be easy to de­tect by a scan tool, us­ing the Power Bal­ance test that mon­i­tors each cylin­der. This ap­plies to just about any diesel. The best tool for a Power Stroke, of course, is the Ford In­te­grated Di­ag­nos­tic Sys­tem. It’s ex­pen­sive, but worth the price for a diesel re­pair shop.

“Mon­i­tor­ing Power Bal­ance us­ing IDS is very ac­cu­rate and never mis­di­ag­noses a prob­lem in my ex­pe­ri­ence,” says Ken­neth Tripp, a for­mer Ford en­gi­neer and owner of Tripp Trucks in Rock Hill, South Carolina, a highly re­spected diesel-re­pair shop. “If you can make the truck re­peat the con­cern con­sis­tently, have the tech­ni­cian ride with you while he mon­i­tors the Power Bal­ance, and that should iden­tify which cylin­der is mis­fir­ing. Just be­cause there are no trou­ble codes doesn’t mean any­thing, and frankly, I never go off of those codes any­way.”

Ken also says just be­cause a 6.0L has been up­graded with cylin­der-head studs, new oil and EGR cool­ers, a wa­ter pump, and fuel-in­jec­tion-con­trol mod­ule doesn’t mean ev­ery­thing re­lated to the en­gine is trou­ble-free. “The process doesn’t re­ally in­volve any­thing to do with the fuel-in­jec­tion side of things, aside from the high-pres­sure oil sys­tem and fuel-pres­sure-reg­u­la­tor up­grades,” Ken says. “But if all the up­dates are done and studs are torqued cor­rectly when the work is done, you should have a re­li­able en­gine for many years.” We rec­om­mend per­form­ing a full ser­vice re­gard­less of what a seller says has been done. “Proper oil changes and ad­e­quate fuel qual­ity and pres­sure are the life­line of the fuel in­jec­tors on the 6.0L Power Stroke,” Ken adds.

Done prop­erly (by only us­ing the up­grade parts man­u­fac­tured and of­fered by Bul­let Proof Diesel), “bul­let­proof­ing” 6.0L Ford Power Stroke en­gines cor­rects the well-known short­com­ings of stock pow­er­plants. How­ever, own­ers should also be vig­i­lant about up­grad­ing and main­tain­ing the in­jec­tion sys­tem with af­ter­mar­ket lift pumps and fil­ters to en­sure a long en­gine life.

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