I;m asking this for a friend, he's got a 03 4x4 6 speed, stock. It was not starting at all when the temp was below 0C , so it went to the dealer and they said it was the lift pump, so that got fixed and then it was starting fine. Then when he goes on the highway it won't go over 110KM/H and on a hill it will drop down to 80km/h with the pedal to the floor it 5th and 6th and has no power at all, any ideas?

 

When was the last time he changed the fuel filter?

MikeyB

 

about one week ago, had the whole fuel system checked and cleaned to see if thats why it wasn't starting, could it be the injector pump.

 

Let's assume that dealer did verify that the fuel was not gelling/waxing at low temps and merely plugging the fuel system as a result. And lets assume that the dealer truely did confirm that the old lift pump had failed before replacing it. If so, then the following might help.

If dealer did not check fuel condition, replace fuel filter, service fuel system and confirm low pressure fuel flow & pressure at time lift pump was diagnosed & replaced that's where I'd start. Lift pump failures are often closely associated with clogged fuel pick-up screens, poor fuel quality, and/or dirty fuel filters. Any and all such conditions just make the lift pump work too hard moving the required fuel from tank to injection pump and, in the case of debris making it through the fuel pick-up screens, provide the pump with an unhealthy diet of dirt and debris to wear out and/or damage pump internals. Restrictions in the low pressure fuel system will almost always show up as low power from lack of fuel pressure/quantity and those conditions alone frequently damage the high pressure injection pump. Immediate use of a reputable fuel conditioner (cleaner-winterizer) and frequent fuel filter changes (as future fuel filter replacement inspections dictate) for the next several thousand miles might completely solve the problem assuming power is restored immediately following the fuel filter change and the addition of the fuel treatment.

However, if bad fuel quality is discovered and/or power is not fully retored after changing the fuel filter, drop and clean the fuel tank and carefully inspect/clean/replace fuel pick-up screens as the screens could be quite obstructed with all kinds of nasty stuff from dirt to microbes.

Many CTD owners install low and high pressure fuel pressure gauges or digital read-outs to allow constant monitoring of the fuel system and provide advance warning of many fuel system problems before they leave them stranded on the side of a lonely road some dark night in the midst of a blizzard. This might be an approach your friend would like to consider in order to avoid trouble in the future.

Best of luck!

 

I was checking with him and he said that he has these codes, 0630, 0633, 0628, anybody know what these are or where to look them up? thanks.

 

https://www.dieseltruckresource.com/...n&onlynewfaq=1


Here are the common codes.