Gdetrailer wrote:
RLS7201 wrote:
Gdetrailer wrote:
TFI is only one part, there is the ECM (Engine Control Module) which is the "computer" or "brain" that controls ignition timing and fuel delivery to the engine. ECM has predefined fuel and ignition maps and uses a variety of external sensors (some which you have replaced) to determine timing and fuel delivery.. ECMs where often mounted in the engine compartment near the windshield, not sure where it is on a Chassis build.. Failing ECMs can affect engine performance..
ECM on OP's chassis is on the inside of the fire wall, just in front of the steering column. Not exposed to engine heat.
Richard
Good to know, however, "heat soak" can still apply to the ECM even if is living a a cooler environment. This is especially true if there is failing components inside the ECM (which may be surrounded with potting material which is supposed to reduce vibration and moisture damage to the ECM). If it is potted, it makes heat dissipation of the internal components much slower. Parts tend to heat up faster and stay hotter than they were designed to be at.
OP has a 26 yr old vehicle, fair chance there are failing capacitors, semiconductors or even "cold solder joints" in the ECM at the least..
Op already has changed pretty much every electronic part within the engine compartment without change to the symptoms. ECM is a common part that controls not only ignition but the fuel delivery which will affect engine operation and performance.
I would also suggest taking a look at all of the wiring harness ground connections, not unusual for vehicles of that age to start having failing ground connections and it only takes one corroded ground to foul up the works.
OP's ECM (EEC-IV, catch code MOO0) is not potted. It sits on a heat shield blanket fastened to the fire wall. Yes the Electrolytic Capacitor do fail over time but their failure is prevalent weather hot or cold. Of my 21 years of owning a 95 F53, I've not seen issues with bad solder joints. The Electrolytic Capacitors are the most common issues.
To the OP. Make sure you have a gray Ignition Module. The black ones are for older EFI Fords. Remove the ECM, open its container and look at the ends of the Electrolytic Capacitors. They will be bulging if going bad.
Richard
