406 2.1td

pavlf · Post by **pavlf** » Mon Mar 05, 2007 11:46 am

yeah, i reckon I should be doing a few miles! Unless I leave it there on the street looking shiny

neildavies · Post by **neildavies** » Mon Mar 05, 2007 1:32 pm

That's great news on the car having a new belt and glow plugs. Should keep you right for a good while. Keep that oil changed every 6k and the air and fuel filter every 18k.

I regularly miss my old 2.1. That's not to say I didn't have any trouble with it, but when it was going well, it really was a lovely car to drive and be driven in.

When I part ex'd it, there was nothing wrong with it at all, and due to the monster mileage on it, someone was going to have a real bargain when that was sold on.

pavlf · Post by **pavlf** » Wed Mar 07, 2007 11:04 am

Oh dear ... I knew it was all too good to be true! I seem to have a slight problem, namely when cold, or at least within the first five mins of operation the engine is doing the pulsing/hunting thing - sometimes up to 3k revs - it only lasts for a few minutes and then settles down but it really isn't good and certainly doesn't feel particularly safe in traffic. I've seen a few other threads about this ... please say it isn't the fuel pump

... I can't afford that. Any ideas what it might be? It's odd because it only happens when the engine is cold, once even just slightly warm it's fine. It's definitely something that needs sorting out anyhow.

Best, Paul

jameslxdt · Post by **jameslxdt** » Wed Mar 07, 2007 6:56 pm

the favorite is unfortuntley the pump on the 2.1, but if its only doing it from cold it could be the coolant temperature sensor or even the throttle pedal sensor

pavlf · Post by **pavlf** » Thu Mar 08, 2007 9:31 am

Hmmm ... I'm not sure that it is the fuel pump. It did the same thing again last night, this time from a cold start with no throttle it revved itself up for maybe a minute, revving up to @2500, and then calmed down and subsequently drove absolutely normally. This morning, another cold start (I was dreading it) but it started fine, no revving, nothing, and then drove here without a hitch. Is this perhaps indicative of air in the fuel supply?

jameslxdt · Post by **jameslxdt** » Thu Mar 08, 2007 7:21 pm

if you have air in the fuel lines then it will run, very badly like its got a permenant misfire, these sympytoms are typical of pump failure, though it could be, your injectors leaking while the engine cools down, and when you start the fuel that has leaked is burned off when you first start from cold, you can get the injectors leak tested to see if this is your problem, it could also be, but unlikely, an internal oil leak, which only occurs when the engine is switched off and cooling down, the oil leaks into the swirl chamber or onto the piston, so that when you start the oil is burned and the engine revs up, does it smoke at all when it revs itself
does the K light come on when the problem occurs?

pavlf · Post by **pavlf** » Thu Mar 08, 2007 8:28 pm

Nope, no smoke, no lights, nothing, just the "auto-revving". I've been driving around in it all today and no repeat performance. It sat around for a while this afternoon and when restarted there was a vague hint that it was about to do it again, most noticeable when decelerating in gear shortly after setting off. The thing is it runs fine - aside from this strange behaviour at start-up - once it's going, the engine isn't erratic, it's very smooth, lots of power, doesn't miss, doesn't seem to be suffering from a fuel problem as such, so I'm hoping this rules out the pump.

Anyhow, I've done some forum research since then and find that perhaps it's the water temperature sensor (how I hope!) - it seems to have been this problem for a few other people. So, I'm going to see how it develops over the next few days before finally going to a garage, I might try out changing the water sensor myself first.

pavlf · Post by **pavlf** » Mon Mar 12, 2007 10:42 am

just a quick post in case anyone else has to sort out a similar problem - put it on a computer this morning and yep, it's the fuel temp sensor. It's no big deal, a small and easy job.

Thanks for all your help everyone. Paul

neildavies · Post by **neildavies** » Mon Mar 12, 2007 12:13 pm

That'll be a sigh of relief for yout then. Glad your on the way to getting it sorted.

pavlf · Post by **pavlf** » Mon Mar 12, 2007 12:22 pm

Yeah, a big sigh! I was s*****g myself that it was the pump. I couldn't go there at all. I didn't really know what I was going to do in that event. Try to return it to the garage from whence it came I suppose ....