Renault Laguna, Y reg. But why, Reg?

[scaryoldcortina]

Yeah, she's paid for the door, my time fitting it and tonight's beer and takeaway and it didn't even come close to her excess amount.

 

Bonus of no paperwork and no "have you been in an accident" calls. No new ones, anyway.

[scaryoldcortina]

Oh yeah, I also took the hazard switch from the scrapper to try and reduce the number of certain MoT fails on the car, but it's worse than the one I have - it doesn't work at all where mine works but won't switch off any more.

[Pillock]

There were about half a dozen variations on silver when my mum was looking at a Megane of around the same age. She got lease cars, she missed the deadline to have the paperwork in so had to order it over the phone and went for "some sort of silvery grey" that the chap in the transport office described. It played on her mind so much she went into a dealer to try and work out what she'd ordered only to find out 50% of the colours could be so described.

 

Only Renault could have two identical cars from similar years with different motors and plugs though. Their P&I department in the factory must have been a headache.

[Burnside]

Glad you got the door sorted so quickly, nothing worse than dealing with insurance companies and filling in all the bloody forms and calls etc. Though you could of probably just waited for one of the AS Laguna's to fail then bagged yourself a door / another free Laguna. 

 

Saying that my Brother booked our Laguna in for the MOT in a few weeks time so maybe I'm tempting fate. 

[SiC]

Oh yeah, I also took the hazard switch from the scrapper to try and reduce the number of certain MoT fails on the car, but it's worse than the one I have - it doesn't work at all where mine works but won't switch off any more.

Does the MOT require a button to be pushed to activate it, or is plugging in a button to activate it acceptable?

[Pillock]

Just wire in any old switch from Maplin, will that pass?

 

[scaryoldcortina]

Don't think I didn't think of that! No, it has to work as a switch.

 

Edit - pillock, I thought of that too. It also has to illuminate to show it's on. A huge incandescent bulb in an open holder right above the knife switch should do.

[SiC]

What about this one?

[SiC]

Does the original switch not still light and continue using that as the tale-tail? Or is the indicators together on the dashboard not sufficient?

[scaryoldcortina]

1.4 in the manual -

The hazard warning lamp ‘tell tale’ may be a separate light or the same as the indicator ‘tell-tale. However, it must be a flashing light.

 

So the indicator warning would do for that. Tbh, my ideal solution is to find a Laguna hazard switch that works (stop lauging at the back! Yes, you!) but I'm resigned to continued use of this car involving juryrigging some broken stuff (like the horn) so I can pass it in July. You never know, it might end up with a kit-car style row of Speedy Spares switches and a megasquirt keeping the engine running. I just hope it doesn't!

[SiC]

What amazed me is that the one in my Grandads 2002 lag 2 has literally only ever been pressed at MOT time has broken. Currently held in with a business card to stop it popping out. Quite literally broken itself.

 

Oh I also at the weekend cleaned up the corrosion on the crank sensor in it and that seems to have fixed the difficult starting. Also pushed the pins slightly outwards as I read somewhere it helps connectivity.

 

You can tell it's been in care* of a Renault dealer - zip ties everywhere replacing broken clips that used to hold wiring looms and pipes. One of them very helpfully ziptied one onto the top engine cover. :/

[garethj]

Is it possible to repair the existing switch?  Have you taken it apart to see what's wrong, they're generally quite simple.

[conkerman]

Pop the switch out ans f soak it in some silicone lube? Worth a try I reckon.

 

Sent from my Vodafone Smart ultra 6 using Tapatalk

[Guest Hooli]

 my ideal solution is to find a Laguna hazard switch that works (stop lauging at the back! Yes, you!)

 

I've got one!

 

You can't have it though, as my goona is still working too.

[scaryoldcortina]

^ It's OK, I'll wait!

[Jim Bell]

It's been five hours, so Either the hazard switch will have died or a spring will have snapped.

[scaryoldcortina]

Must remember to change the crank sensor. I said that to myself this morning while the car was refusing to start. Seeing as I was in a hurry to go rescue someone else whose car would not start I tried to leave in the focus instead, and that wouldn't start either (flat battery from lack of use).

 

April Fools day. Bah.

 

Unplugged and replugged the crank sensor, it runs again but half the airbox is on the back seat for now.

[SiC]

Unplugged and replugged the crank sensor, it runs again but half the airbox is on the back seat for now.

Try splaying out the pins on the crank sensor ever so slightly - that appeared to work on my Grandads one just fine. Or just replace the damn thing!

 

I was surprised how easy it was to get to ... for a Renault.

[scaryoldcortina]

That trick only seems to work until the next time it fails!

[scaryoldcortina]

This week I've plugged and unplugged the crank sensor at least five times.

 

Friday afternoon though...

 

 

Here we go. I wanted to get a before and after scope trace because I'm curious about how exactly crank sensors fail. I know they do, I've changed plenty, but how is a mystery because they usually look clean and report the correct resistance when probed. Coils though, resistance isn't even half the story.

 

Enough waffle. This is the trace for the old one.

 

 

At first glance, it looks ok. The waveform seems fairly well defined, the notch for TDC is very obvious. If I'm going to be picky I'd say it was a little raggy and doesn't always peak (or trough) in the same place. I was a bit nonplussed because it seems fine. Certainly good enough for the car to start and run most of the time anyway.

 

 

New one. Peaks reliably at 4.0v and 1.0v every single time, looks a good deal smoother and less stretched. Yay! Well, I say "Yay" but lets see if it starts all next week before calling it fixed.

 

The eagle eyed among you probably noticed I'm running the scope through a windows XP virtual machine. This is because windows 10 is more broken than the laguna.

[SiC]

I dunno man. That top waveform looks perfectly acceptable to me from a SNR point of view. Nothing a bit of LPF on the ADC front end of the ECU won't smoothen out completely. Was that in its FTP failure state?

 

 

The eagle eyed among you probably noticed I'm running the scope through a windows XP virtual machine. This is because windows 10 is more broken than the laguna.

Is the host OS win 10 with a custom theme? Looks a lot like a Linux distro.

[scaryoldcortina]

Not a FTP, that's the wave with the engine running at tickover. Unsurprisingly I didn't have a laptop or a scope to hand all the times it failed. My guess is that while cranking the wave degrades to the point where the ECU can't determine TDC anymore. Scrolling through the scope output, the old sensor is raggier, and stretched P-P compared to the new one.

 

Host os is Debian. I have win 10 on a dual boot but it keeps throwing up USB connection errors and disconnecting the scope for absolutely no reason.

 

I also found the bit encoded failure list

 

[michael1703]

Lest we forget, sound the bugle

[scaryoldcortina]

 

Also, while on a bit of a fixing things roll, I took the hazard switch to bits. It's a SPST latching switch so easy to replace if this doesn't work, but I bent the contacts back out and silicone greased the latching mech (the spiral pattern on the white bit) then put it back together and fitted it.

 

It works. Remains to see if it still pops itself out randomly and flattens the battery though.

 

One other thing from today, I need to sort out the self cancelling not doing its job. I went to tescos, and just after I turn left out of the industrial estate there is another left turn on a right hand bend. Even though I was obviously following the bend and not turning off a taxi shot out in front of me. After I braked and he swerved honked and swore at me I noticed I was still signalling left.

[beko1987]

Eh?

[scaryoldcortina]

which part?

[beko1987]

Ah, didnt realise you had posted again, the first part, with the speedo

[Slartibartfast]

Please, sir, it's Mint, surely? That's KDE and I'm pretty sure I see the mint logo on the K menu

[scaryoldcortina]

LMDE

[twosmoke300]

What scope set up is that ? Looking to get a scope but like everything it's a minefield