My 1998 Peugeot 406 TD has begun to over rev on start up although it seems to resolve when the engine has been running.
It will also rev up when, for example, stopped at traffic lights or when stopped with the engine running in a queue of traffic. Has anyone else experienced this and is there a cure. I have an MOT (Northern Ireland style) on the 01/09/2005.
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Is the injector pump Lucas?
This could be a symptom of damaged diaphragm within the pump that controls fuel enrichment under boost. Fuel can travel from the pump back up the pipe to the intercooler - large amount of fuel is then ingested resulting in smoke.
When mine went the pump clatter would be very noisy for a few seconds, then disappeared once excess fuel had been burnt.
You could run the engine, and while running disconnect pipe leading from intercooler to pump at intercooler end. Fuel will drip from the spigot - that was how mine was diagnosed in front of me by diesel specialist.
Do not think you could repair it yourself. The diaphragm is not available separately, so new boost unit is needed. This involves pump removal and disassembly.
If I recall rightly it cost me about £350 including labour, but I took the opportunity of having cam belt done at same time as the pump was coming off anyway.
I was advised no need for new pump which would have been £700?
Now been ok for over 15 months.
Best advice is still to drop into your nearest diesel specialist.
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I have the same trouble with my P reg 406. It has always done it the previous owner used to take it to the dealer while it was under guarantee but it never got cured. The favourite cure was "cleaning the the connection to the camshaft sensor" whereever or whatever that is. Since I have had the car, about two years it happens at intervals, I have been ignoring it and it goes away. It usually cycles between 2000 and 2500rpm for 20 seconds or so which seems an age. It only very occasionally happens when moving but that can be quite disconcerting. But I have become interested in it because it has suddenly started doing it with a vengance, this morning while waiting at a junction it started revving up and down and then shot round (briefly) to 5000rpm!
I wonder if the present high ambient temperatures have any bearing on it. I shall look into the injector pump suggestion and I would be grateful if anyone can tell me where the camshaft sensor might be found.
Any other suggestions gratefully received of course
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Does anyone have any updated views on this problem? the problem with mine has now become embarrassing! I think it will have to go to the local agent (via my wallet) to be looked at. I saw a suggestion on a diesal forum that unlikely as it sounds changing the water temperature sensor on the thermostat housing cures this. Any comments before I try this as a last resort?
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It can't be too bad if you have put up with it for nearly 2 months! Before you go and line your local agent's pockets why not try a diesel injection specialist? They are likely to know the fix as they specialise in the systems. The water temp sensor is a possibility; is it a DIY job with a cheap part?
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My aplogies, I was replying to the wrong post ie the original one and not yours, Cholin
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Try :-www.frenchcarforum.co.uk/
formerly known as Andyspares, and try the Citroen section as this forum is very active ( and the engine in your car is used in Citroens) and there are quite a lot of knowledgeable people on it.
Also I would probably favour a diesel injection specialist over a main dealer.
Reggie
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Thanks for responses. No prob. A.S!
It was from Andyspares where among a variety of other suggestions I picked up the water sensor idea. the trouble seems to be that people seldom seem to provide feedback if an idea works so I don't know if the person it was originally aimed at had any success. Meanwhile I have been round to the local agent and in the back door as it were but the guy who was pointed out as the TD expert hadn't come across the fault and seemed incredulous about the sensor having anything to do with it. The upshot is I have booked it in for a diagnostic check to see if that produces anything positive, that is a week ahead so I will post any comments afterwards. It may agree that a visit to an injector specialist is called for in which case I'll bet they suggest their own.
Cheers.
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When people refer to a Lucas pump it may also say CAV or Rotodiesel on the pump,they're all the same.
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Update on this if anyone still listening! Diagnostic test revealed that the "water temperature thermister was faulty". Idid get a trifle cynical about this as I'd mentioned it to them in the first, especially as the new one I fitted made not a whit of difference. Anyway as far as I can see this only controls the temperature guage, they gave me the part number so I wouldn't be confused! but could they have been confused and meant the "bitron" sensor? Haven't looked at the pump yet.
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I'm still listening and interested!
So what are you going to do now? A diesel specialist, or replace the part again with their part?
Reggie
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Srry Reggie don't think I made myself clear it was with their part that I made the replacement so I was thinking of going back and saying "That didn't work, now what?" As far as I can judge looking at previous threads and on the Frenchcars pages this isn't an uncommon fault with these engines I would have thought that Peugeot was aware of it and had a definitive answer which would have been passed on to their agents. Or am I being naive?
Contrary to what I said earlier one person did say that the thermistor replacement definitely worked but I couldn't contact him for more information.
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I understand now.
Reggie.
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Second diagnostic revealed "engine" temp thermister as faulty!
Why the first one didn't reveal this wasn't forthcoming however since new thermister fitted no further problems. But very early days yet. Not overly thrilled with pug agent.
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