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The Joy Of 240's, with issues...

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Old Jan 9th, 2020, 20:58   #1
CosmicBike
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Last Online: Mar 4th, 2024 22:29
Join Date: Dec 2019
Location: Surrey
Default The Joy Of 240's, with issues...

After an uneventful drive from collecting the new 1993 240 estate, it's time to get stuck into the various little (I hope) niggles prior to the MOT which is due in a couple of weeks time.

Aside from consumables like windscreen wipers, I need to

1. Repair the tailgate brake light. Suspect the hinge wiring or earth, it 'glows' all the time the car is running, no idea if it lights up on the brake pedal.

2. Repair the rear light clusters. Both are held together with tape, but all the bits are there. 20+ years of building RC aircraft will help with that bit.

3. The biggie. Engine light on.....Fault codes are 113 (injector fault), 221 (compensating for extremely rich or lean at cruise) & 231 (compensating for rich or lean at cruise). The first 2 codes result in the engine warning light being lit, the 3rd does not.

I have reset the codes, they return along with the warning light as soon as the car is started. Things checked so far in limited available time.

MAF resistance measured at 3.1 Ohms, within range for the LH2.4 system, so presumed OK. No error codes for MAF either.

Checked inlet hoses for damage, all OK.

Lambda sensor (3 wire type) resistance measured at 3 Ohms cold, 6 Ohms just after starting so will check that it's 13 Ohms hot tomorrow. Need to check voltage output when running also to ensure it is signalling the ECU correctly.

Injectors. Listened to all 4, they are clicking nicely. Resistance on all is the same and pretty much at spec at 15.6 Ohms (book says 16). Not sure if there is a value in a noid test since they are all clicking so assume getting a signal.

Hopefully going in the right direction. No smoke on idle or under load. Got a bit of time the next few days so hopefully nail the engine light issue, the rest is just good old fashioned mechanics.
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