After swapping engines on this truck twice, we got it running. It was running well for abut 3 weeks, then just died while driving along happily at 35mph.
Since then it will only start very occassionally, and when it does, it runs very badly. It dies if you open the throttle. It won't restart once the engine is the slightest bit warm, and there is the smell of gas in the engine bay. It also sputters to life for about 2 seconds when cranked at WOT. Maybe gets to 2K then dies. Again, strong smell of gas from the engine bay.
There are no obvious fuel leaks. I've replaced the CPS, Cam PS, coil pack. I've verified consistent spark, even when just cranking through use of an inductive timing light. Spark appears regular etc.
I am kind of at a loss as to where to look next. The engine cranks as though it has good compression. There was one code in the ECU - forget the number but it was reduced efficiency of one cat.
Some background... the original engine was badly overheated and the head warped. It was such a mess that a used engine purchased and installed. That engine was a dog and never really ran at all. Another was provided by the vendor of the first and it was put in and ran perfectly for about 3 weeks. Now here we are... I have 2 used, non working engines on the garage floor - a ready source of sensors and so forth.
BTW - 03 Explorer 4.0V6
Any help and advice gratefully accepted
Dave
Since then it will only start very occassionally, and when it does, it runs very badly. It dies if you open the throttle. It won't restart once the engine is the slightest bit warm, and there is the smell of gas in the engine bay. It also sputters to life for about 2 seconds when cranked at WOT. Maybe gets to 2K then dies. Again, strong smell of gas from the engine bay.
There are no obvious fuel leaks. I've replaced the CPS, Cam PS, coil pack. I've verified consistent spark, even when just cranking through use of an inductive timing light. Spark appears regular etc.
I am kind of at a loss as to where to look next. The engine cranks as though it has good compression. There was one code in the ECU - forget the number but it was reduced efficiency of one cat.
Some background... the original engine was badly overheated and the head warped. It was such a mess that a used engine purchased and installed. That engine was a dog and never really ran at all. Another was provided by the vendor of the first and it was put in and ran perfectly for about 3 weeks. Now here we are... I have 2 used, non working engines on the garage floor - a ready source of sensors and so forth.
BTW - 03 Explorer 4.0V6
Any help and advice gratefully accepted
Dave
