Peterdroy66
Registered User
92 5Spd
symptom: intermittent poor idle, failing timing advance
When: CAN BE CAUSED by idling too low - ie letting clutch out too slow, but will also cause randomly sitting at idle, or coasting to a stop.
CAN be cleared 80% of the time by taking RPMS up over 1600 rpm.
The above observations are very consistent and repeatable.
I can see on diagnostics interface (EASE COMPUTER), the timing is clearly loosing its 'commanded' advance.
For example at idle it is normallly 20-21degrees fluctuating normally, when the condition is brought on, it clearly drops to a rock solid 10degrees.
Last night, against my gut but running out of tricks to try, I replaced the DIS with a new FORD part.
I cannot bring this on by any wire wiggling under the hood.
Battery voltage, and 5V logic voltage are remaining stable under all conditions.
I tried some additional ground wires at various places to the battery/body with no improvement.
I would consider fuel pressure/pump, however watching the ignition timing really points to an ignition issue.
Again, it is too regular to be an intermittent or bad wire somewhere.
My main thought is that SOMETHING is CAUSING the EEC to stop sending timing information, but I do not know what or why?
Looking of experienced suggestions/input.
Pete in Toronto
symptom: intermittent poor idle, failing timing advance
When: CAN BE CAUSED by idling too low - ie letting clutch out too slow, but will also cause randomly sitting at idle, or coasting to a stop.
CAN be cleared 80% of the time by taking RPMS up over 1600 rpm.
The above observations are very consistent and repeatable.
I can see on diagnostics interface (EASE COMPUTER), the timing is clearly loosing its 'commanded' advance.
For example at idle it is normallly 20-21degrees fluctuating normally, when the condition is brought on, it clearly drops to a rock solid 10degrees.
Last night, against my gut but running out of tricks to try, I replaced the DIS with a new FORD part.
I cannot bring this on by any wire wiggling under the hood.
Battery voltage, and 5V logic voltage are remaining stable under all conditions.
I tried some additional ground wires at various places to the battery/body with no improvement.
I would consider fuel pressure/pump, however watching the ignition timing really points to an ignition issue.
Again, it is too regular to be an intermittent or bad wire somewhere.
My main thought is that SOMETHING is CAUSING the EEC to stop sending timing information, but I do not know what or why?
Looking of experienced suggestions/input.
Pete in Toronto