QuestionI have a 1997 4.6 that will not start. While driving down the road one day it just stopped working. Fuel and spark seem to be fine. After letting it sit for a few days with the battery undone, I tried to restart it only to find that the EMS fuse(27) blows after running for just a few seconds or not at all, just turning over. I dont think its the immobilization kicking in and Im really not sure what else to try, anything will help. I thank you for your time and info.....
David M. Currey
AnswerHi David,
sounds like it could be the Engine Control Module. Do you have a Check Engine Light?
Here's some notes I found:
Relay module
The engine management system employs a relay module, which houses the main relay and the fuel pump relay.
Main relay
The main relay supplies the power feed to the ECM with a tap off to feed the fuel injectors (8 amps) and air flow sensor (4 amps). This relay is controlled by the engine management ECM. This enables the ECM to remain powered up after ignition is switched off. During this ’ECM power down routine’ the ECM records all temperature readings and powers the stepper motor to the fully open position. Failure of this relay will result in the engine management ECM not being switched on resulting in engine not starting due to absence of fuel and ignition.
<also>
The system is controlled by the ENGINE CONTROL MODULE (ECM) which receives data from sensors located on and around the engine. From this information it provides the correct fuel requirements and ignition timing at all engine loads and speeds.
The ignition system does not use a distributor. It is a direct ignition system (DIS), using four double ended coils. The circuit to each coil is completed by switching inside the ECM.
For Series I, the ECM is located on the firewall.
LR mechanic could bench test to see if faulted.
Best of luck,
JohnMc
