Engine Mechanical problem
1998 Ford F150 V8 Two Wheel Drive Automatic 125k miles
This one is a little strange (aren't they all) My 98 4.6L has a Karr 2040 aftermarket alarm. A month ago, leaving Home Depot it would crank but not start. The alarm has been a little flakey so I reset the alarm (thinking that there might be a fuel pump shut off connection to it) and then engine started. A few weeks later it happened again - same remedy - set then disarm alarm. Happened a week later, then a few days later all with the alarm reset remedy working. Now finally - same symptom - cranks but won't start - but alarm set and disarm no longer solves the problem. The alarm still seems to be working.
Diagnostics so far:
Checked Fuel pump fuse - good
Swapped Fuel pump relay with horn relay (same part number) - no effect
Checked emergency fuel pump cutoff switch - ok
Intentionally triggered alarm and tried to start - engine would not crank - this is actually good - starter disable is exactly what a tripped alarm is supposed to do per the Karr manual. There is no fuel pump connection mentioned.
At this point, don't know if alarm involvement is real or coincidence but for the life of me I don't understand how it could be involved.
I am fairly mechanically proficient - have in the past done drum brake jobs, manual trani fixes & done short-block level engine swaps, but don't have the test equipment for these new electronic beasts - and can't afford a high dollar dealer repair after over a year unemployed. Help!
Friday, December 4th, 2009 AT 12:09 AM