Join Date: Sep 2002
Location: north coast nsw
The problem is a lumpy idle. It's had a lumpy idle for a while but last weekend it got lumpier. It also lacks power on hills... but my previous wagon was an EL, so this baby has always seemed to lack a bit of punch.
Prior to testing the EST, I did all the usual things for a lumpy idle - plugs, leads, filters, dist cap, rotor, checked vac hoses, PVC valve etc. The head was reconditioned 10,000k ago.
The wiring looks very good... can't see any problems there. I am installing new battery terminals and will clean up all connections. It's just had a new battery too.
On the coolant temp sensor side, there's been another development today. I got another thermometer and re-ran the test. On this thermometer, the sensor's resistance is a bit outside the spec range at each temperature on the high side.
That means it's telling the EST the engine isn't warmed up... when it is... so the EST might be trying to advance the timing by 10deg as it usually does when the engine temp is less than 70deg.
The error code was probably generated when the EST wasn't getting a "warmed up" reading from the temp sensor, yet it knew the engine had been running for say 30min... so it says "something's wrong".
I've ordered another sensor and will test it side by side with the current one tomorrow.