rustybolt
New Member
- Joined
- Mar 7, 2009
- Messages
- 28
- Reaction score
- 0
- Points
- 0
- Vehicle Year
- 1999
- Make / Model
- Ford
- Engine Size
- 3.0
- Transmission
- Manual
Hi all - I have a 1999 Ranger XLT with a 3.0L V6 Flex Fuel engine. Two weeks ago, for the very first time, the engine would not run. Turns over fine, normal startup sequence, but no spark at the spark plug. I have checked the coil pack for resistance on the primaries of each coil and it still meets specifications (about 2.5 - 5 ohms). I've also confirmed that the PCM is not controlling the coil pack when engine is in this fault mode. Basically, this problem is intermittent. Some days it will start right up and run perfectly. Other days it will turn over but not run. In addition to checking the coil pack, I've also checked and confirmed proper operation of the crankshaft position sensor. Outputs a sine wave like frequency proportional to the engine RPM, everytime. Seems to me that this could be a connector problem in the engine compartment or a flaky ground but so far I haven't found any corrosion problems on the engine wiring harness connectors or the PCM bulkhead connector. I've also checked and tested all the grounds in and around the engine. All looks good. Maybe the PCM is going screwing up? Hard to say at this point. Any help would be greatly appreciated. Thanks...