I am actually writing on behalf of my neighbor lady who I am trying to help out because her 1998 Taurus 3.0L SOC with 144k miles wont start. She has limited income so I am trying to fix it for her and have her pay for parts only. Last year she had a "mom and pop shop" replace the spark plugs, wires and fuel injectors because they said it needed it because the car started running a little rough.
Pulled a spark plug and wires and they look fairly new but can't vouch for injectors.
I don't work on cars professionally but have worked on all my own vehicles for the past 30 years and have done just about everything on a car aside from tearing down an AT. This one has me stumped
Anyway here's what we have so far. She said that the car started running rough and she could smell some burning. She managed to get the car home but it wouldn't start the following day. It sat for a couple weeks before I asked her if her car was broke down.
I checked under the hood and found that the crank sensor wire had rubbed through the insulation at the corner of the block and caused a short. The wires where exposed and the insulation was melted and charred. I replaced the wire and rewrapped it. There where NO blown fuses. The 3 month old battery was also completely dead assuming from the short.
I am not getting any trouble codes on my ODB2 scanner but then again the battery was dead.
I recharged the battery and tried to start the car. It turns over normal but doesn't fire at all. The Haynes manual says that if the crank sensor is bad then the ignition coil pack won't fire at all. I checked the ignition pack with my ohm meter and it checks out fine and within speck. I also have spark on all 6 cylinders with my ignition spark tester.
The fuel pump runs and the inertia switch is pressed but I don't have a fuel pressure gauge to measure pressure. However, when I press in the stem on the schrader valve on the fuel rail while the car is off, fuel squirts out so there must be some pressure.
There seems to be plenty of air coming out of the tailpipe when we turn the engine over so the catalytic converter isn't clogged.
Sprayed starting fluid in the intake at the throttle body several times and this did NOT make a difference when trying to crank the engine. Figure if it wasn't getting fuel then at least with the spray in the intake it would want to start for a few seconds.
So we have good cranking, spark, air and starting fluid at the intake but the engine doesn't want to fire up even for a second.
Plugs and wires are almost new. Ignition coil pack fires on all cylinders. Assume the injectors are ok since they supposedly where replaced last year. Some fuel pressure on the rail and fuel pump runs. Good airflow. Starting fluid in intake didn't start engine.
I've also removed and reconnected all sensor plugs several times to rule out corrosion on the contacts and the Haynes manual says only the crank sensor failure will keep it from starting.
Don't think the timing chain would fail at 144k miles? Low compression wouldn't happen over night?
Any help will be much appreciated by myself and my neighbor.
Thanks and best regards,