Outer Limits 4x4 Board

Anyone know what the plug lead resistance is supposed to be? It's not mentioned in the FSM

Thanks,
Jas

If you're trying to diagnose a fault then in my experience using a multimeter to check is a pointless exercise. The lead might measure OK but be breaking down with high voltage.

As murcod says, you still can be getting a good reading, but only in the extremely low current flow from a multimeter.
Best thing to do, is to buy new leads to eliminate them out of youre fault tracing. If it didnt work, then youre old leads are propably still good, so keep them as spares.

Just trying to sort a niggly problem.
The other day it conked out with no warning and rolled to a stop in gear. I checked coil leads and rotor and then it started.
Had an intermittent miss for the rest of the day which wasn't bad enough to stop me but on the way home it died 3 or 4 times. Had to pull over on highway.
It restarted first hit of the key without even opening the bonnet.
I tested the coil resistance and it appears fine, put it in another car and it doesn't show the miss.

So next guess was a cracked or shorted coil lead.
I just went and bought a set of Bosch leads and plugs (which it probably needed anyway), so I'll fit them in the morning and see what happens.

Jas.

From memory, I think the rule of thumb was no greater than 14k ohm per 30 cm's of lead. You're problem to me sounds like the ignition module may be on it's way out. Some model cars tacho's play up when the module is on the way out. I don't know if the Sierra falls into this category, but the old Magna's, Camira's and Telstars were renoun for it.

RockHopper wrote:From memory, I think the rule of thumb was no greater than 40k ohm per 30 cm's of lead. You're problem to me sounds like the ignition module may be on it's way out. Some model cars tacho's play up when the module is on the way out. I don't know if the Sierra falls into this category, but the old Magna's, Camira's and Telstars were renoun for it.

You may have something there... The tacho was bouncing around a bit while it was spluttering.
I'll have to carry a spare.

Jas.

Just remember that inductive leads are different to resistive leads ( which really are obsolete technology - and failure prone ).

If your replacing .... inductive are a much beter option,