406oc.co.uk

I have a 1998 406 Estate 1.8 16v that I have been having idles issues with.

I already tried changing the idle control valve and that did not solve the problem.

I figured I would purchase a haynes manual to assist me with trouble shooting this problem however I have noticed that there are 2 editions of the red covered one.

one covers 96 - 97 and was printed in august 97

the other covers 96 - 99

are there really any major differences between these two manuals or is the other one just a second printing with new dates to reflect years released since the first printing?

the reason I ask is because the first print is about a 3rd of the cost

Would guess that the 2nd one covers the HDI's and possibly some altered electronics. The petrol engine is the same.

Edit: what is you idle issue?

When we start the car the revs can spike all the way up to 3000 rpm and stay there.

Usually once we start driving the revs will drop back to around 1000 rpm however they do this with a delay, meaning if you pull away and let the car rev to around 3000 and then clutch to shift the revs will hover for about a second, then they will drop to around 2000, then drop to 1500 and finally drop to 900 - 1000, this stepped drop takes about 4 or 5 seconds. (it's this stepping that made me first think of the idle control valve)

Sometimes on start they will drop back down and sit around 1000 rpm before driving but as soon as we start driving it acts as described above.

If we have to do a lot of off on driving, as in going to half a dozen different places with only short stops in between the revs can then go really silly.

If they do this then they will climb to around 3500 rpm and then start to bounce between 2500 and 3500, the only way to stop this once it reaches this point is to pull over and to the 10 second on, 10 second off reset on the system.

After the reset it will go back to acting like described in paragraph 2

There is no stuttering hesitation or loss of power while actually driving the car, the problem only seems to effect idle.

My 306 went iffy after changing the icv.
I took the lead off the battery and left it off 10mins,

And That sorted it,
There suposed to reset them selves but it didnt on mine,

that's what the key off for 10 seconds, key on for 10 seconds cycle 6 times does, it resets the system.

But that being said the battery has been off for considerably more than an 11 minute stretch