Hi All, have read haynes chapter on idle problems, but not getting on to well with
there solution ,, so require help in easy lay mans terms, speed is about 1500 rpm
all the best wittsy
|
How did it get to be 1500?
Which car and what is the engine code?
Edited by Screwloose on 15/08/2008 at 00:33
|
hi, car is a 1989 volvo 2.3 petrol,, the 1500 rpm is arrived at of its own accord,
this is after a slight change in revs when choke goes off, dont know engine details but will find and post later ,, hope this helps your questions Regards to you
|
|
Idle control valve failed or stuck. Have you checked the diagnostics via the LED and selector plug. Leaking hose, failed servo diapham, load to check. Regards Peter
|
>>failed servo diapham
It can't be a failed servo diaphragm. While the brakes are off, the atmosphere valve is closed, and there is vacuum on both sides of the diaphragm.
So, if there were a hole in the diaphragm, you wouldn't know until you pressed the brake. Only then would the two halves of the servo become indpependent, and the atmosphere valve opens, giving a direct path from outside, via the holed diaphragm to the inlet manifold.
|
|
Is this an injection model, or the B230K with a Cisac carburettor and a complicated vacuum-controlled engine management system, EGR and pulse Air? Lots to go wrong there, needs systematic diagnosis. Let us know the engine details.
|
|
Sorry Number Cruncher I should have been clearer. The bottom of these servos rust and the diaphram to outer case seal fails and they suck in air. easily test by turning the engine off and see how long passes before the servo assist fails, Should be house, when I found this it was seconds. Regards Peter
|
Sorry, just read your post more closely, it has a choke therefore presumably carburettor model.
The first point to check would be , does the choke actually close properly?
I think there is a heat-operated bimetalic spring on the choke mechanism or a subsiduary jet, which would also be worth checking to see it really does cut out.
|
|
|
>>these servos rust and the diaphram to outer case seal fails
Yes, that would do it!
|
|
|
|
|
if you go to www.volvoclub.org.uk/faq/FAQSummary1.html you wil find all you need to know about your car. It is amazing...people have had all your problems and more, and this link gives you links to brickboards.com which is the US site with all the info on.
My trusted mechanic told me I needed a new sunroof mechanism, but using this site, I fixed the roof for no outlay, and in 30 minutes (and I am not technical).
From http;//www.rprusa.com/ there are 10 tips to help you or your mechanic when he services the car, most relevant to you will be the flame trap and the throttle body service.
Your car sounds like it is something to do with the Idle Control Valve...you can buy one brand new on ebay for £20.
|
Hi 2 all people that have replied, Many thanks to you all , I am grateful for
the various answers, I will now work through the different suggestions over
the weekend,, if i am able to find one of these solutions work I will post my
sucess,, if not keep watching.. again thanks to you all.wittsy
|
|
You need to establish first off whether it is carburettor (ie with a choke, as you describe) or injection engine. A dirty Idle Air Valve is one likely cause IF it is injection.
|
wittsy
We do need to know the car and the engine code; as there are 4 different 2.3 engines in a 740 in '89 and a 760 adds another two.
At least they're all fuel injected in some form.
|
wittsy At least they're all fuel injected in some form.
No they are not. Some have a carburetor. This one appears to, as the OP refers to the choke.
|
|
|
|
