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Battery and stop lights, occasional misfiring

#1
Car: 2005 Clio 16v Mk2

I've had the Stop and battery warning lights illuminate when turning the ignition on consistently since I first took it for a run on the motorway. The car was sat on a driveway for 6 months before I bought it and only did short trips before then.

The battery measures 12.5v with the battery off and 14.4v with the engine idling. So I think the alternator is charging the battery okay? The aux belt does look old though.

The last few days I have had an occasional misfire return also which may or may not be related. The coil pack and spark plugs are two weeks old.

Does anyone have any ideas?

Cheers
 
#2
Car: 2005 Clio 16v Mk2

I've had the Stop and battery warning lights illuminate when turning the ignition on consistently since I first took it for a run on the motorway. The car was sat on a driveway for 6 months before I bought it and only did short trips before then.

The battery measures 12.5v with the battery off and 14.4v with the engine idling. So I think the alternator is charging the battery okay? The aux belt does look old though.

The last few days I have had an occasional misfire return also which may or may not be related. The coil pack and spark plugs are two weeks old.

Does anyone have any ideas?

Cheers
This fault does sound like the symptoms of a faulty alternator, have you tried measuring the running voltage with lights, heated screen etc on? Worth leaving your meter on there for a while to see if the voltage drops intermittently. Check your main earth connections/cables also 👍🏾
 
#3
This fault does sound like the symptoms of a faulty alternator, have you tried measuring the running voltage with lights, heated screen etc on? Worth leaving your meter on there for a while to see if the voltage drops intermittently. Check your main earth connections/cables also 👍🏾
I had the clutch changed recently and the mechanic said there was some play in the alt belt. In the last few weeks though the battery voltage hasn't decreased when the engine is off and when it's idling. I haven't tried it with lights and heater on though. I'll try that in the morning.

The misfiring has appeared more recently and id like to sort that before I get the belts changed (cam belt needs changing also).
 

STEVE.M

ClioSport Club Member
#4
I had the clutch changed recently).
Instrument loom earth on back of the box connected?

If recently was when you collected, it was to divert your attention away from the fact that he/she/it has fucked up, but is playing for time, and can charge as a new job.

This one is broken.
Instrument  earth located on the rear of the gearbox.jpg
 
#5
Instrument loom earth on back of the box connected?

If recently was when you collected, it was to divert your attention away from the fact that he/she/it has fucked up, but is playing for time, and can charge as a new job.

This one is broken.
View attachment 1395942
I'll check this in the morning also. The stop and battery warning light was on before I had the clutch done but the misfiring has returned shortly afterward I got it back (after previously being remedied by new coil pack and sparks)
 
#8
This fault does sound like the symptoms of a faulty alternator, have you tried measuring the running voltage with lights, heated screen etc on? Worth leaving your meter on there for a while to see if the voltage drops intermittently. Check your main earth connections/cables also 👍🏾
I did an 85 mile trip on the motorway today. When I got home I checked battery voltages again:

Engine off: 12.7v
Engine on: 14.2v
Engine/radio/lights/heaters on: 14.0v

I couldn't see any broken connections from a visual inspection but the connections onto the alternator look rather rusty.

The alternator belt has about 10mm of play which I believe to be too much?
 

Attachments

#9
I did an 85 mile trip on the motorway today. When I got home I checked battery voltages again:

Engine off: 12.7v
Engine on: 14.2v
Engine/radio/lights/heaters on: 14.0v

I couldn't see any broken connections from a visual inspection but the connections onto the alternator look rather rusty.

The alternator belt has about 10mm of play which I believe to be too much?
I forgot to mention also that I've noticed that the engine seems to misfire when idling when the battery is under load. When the lights and heater are off it fires fine. Any ideas?

Thanks
 
#11
Do you think it is actually a misfire or just rough running? Have you plugged it in to check what faults you have?
I think it's misfiring as the idle speed noticably dips and I've heard it from the exhaust end. It does seem to come and go though.

I don't have a code reader so no I don't know what faults are logging. Can you recommend a code reader to buy? I bought this car for £350 so one on the budget side would be appreciated if possible.
 
#13
So i cleaned up the code reader connector on the car with contact cleaner and actually got a reading. No errors!

The car still is rough when pulling off when the heaters/lights are on though, does anyone have any ideas?
 

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