Hello and Welcome to justanswer..
Kind Rgds, MIKE
Feedback and any Bonuses are always appreciated too. Thank you.
Many thanks for your thorough and quick answer. My apologies for not reacting sooner but the emails have been going into my "spam" folder and I only checked it just now by chance....sorry!
This car actually belongs to my daughter but I have it at the moment to try and resolve the problems. As well as the dash fault, the engine isn't completely happy and has stalled on idle and also surged on idle. I think, but at this minute am not certain, that when I was in the car yesterday, at the instant the rev counter etc came back, the engine surged momentarily and the airbag and service warning lights flashed. I'm using the car myself at the moment to see if I am correct in this.
I'm not trying to get "two for the price of one" here........but I'm just thinking that this info about the idle speed (if I'm correct) may just change your answer. I've actually been thinking it's an ECU problem and am a little surprised at your answer (but please don't take that as an insult-modern car electrics are a mystery to me).
I'd like to defer accepting your answer for the moment while I try and see whether the idle speed does jump actually at the moment that the instruments come back....as I think that if so, you might re-assess your diagnosis. It does seem strange to me that this dash problem seems to have come about at about the same time as the engine starts misbehaving. I have by the way just changed the plugs and the coils (the coils have been dying one by one over the last year or so).
Mike, I hope that you are not too unhappy at me holding off accepting your answer at this time, but I would appreciate your waiting a little longer while I try to satisfy myself as to whether there is a connection between the engine idle and the dash problem.
Hi again Mike,
I appreciate your help and the info you've provided. I've not used this site before, so was wary of pressing the 'accept' button when I felt that things weren't quite finished...but have now accepted your answer.
I would however appreciate a little more help.......
I have now confirmed that when the dash fault clears itself whilst the car is parked and idling, at the instant that the rev counter and temp gauge come back to life, the engine judders, almost stalling, then momentarily surges and the airbag and Service warning lights illuminate for a second or two. I have now experienced this happening 3 times.
Thumping the dash, around the fusebox and waggling the wiring underneath the dash all had no effect on the non-working gauges. And the HRW doesn't work when the gauges aren't working.
Two other bits of (probably useless) info......my very cheap OBDII scanner is showing no faults (I don't think it will pick up Renault specific codes) and the rear fog warning light flickers when the brake pedal is pressed or the reversing lights come on (I don't believe there's an earth fault on the rear light units).
So, summing up, I'm certain that the dash fault caused the engine to hiccup when it cleared itself...or the engine hiccup caused the dash fault to clear....Is it your opinion that a faulty instrument cluster could have such an effect on the engine?
Sorry to trouble you further on this but I'd just like to be sure before I go to the expense of getting the instrument cluster repaired or replaced.
Many thanks for your further help. That should keep me busy for the rest of the weekend!
When, or if, I finally find the problem, I'll let you know what caused it!
After a couple of weeks, I finally figured out what was causing all these symptoms!!
It was the new spark plugs I fitted! The shop had supplied me with plugs that have no resistor and the electrical noise from the ignition was causing all these faults. Because they were a different make to the old ones and not one of the makes shown in my Haynes manual, I couldn't easily check that they were the right ones. And because it was my daughters car, I didn't get to know about the faults for a few days and didn't connect the faults with the change of plugs.
From now on, I'm only ever going to buy plugs with an "R" in their type number!!