Please help if you can!
My car is a 2003 1.8 Vectra SRI
For a while now, on occasions i have had a problem with the revs dropping and rising again, at tickover or pulling up to traffic lights the revs would go down to 650 rpm and rise and fall from around 400 rpm to 1200 rpm.
So i thought i'd give it a go. I thought i would first of all clean the throttle body, it was really gunged up.
So i cleaned it and put it back together. I noticed straight away that the revs were higher so i thought it might be an air leak i replace the large hose type clip which holds the air pipe onto thge throttle body and i tightened up the bolts holding the throttle body into the maniflod, i broke one snapped it off b****r!
After trying several main dealers i went to Allvox, a scrapyard at Derby, got the bolts but when i got home they were about 5mm too big, i went to Halfords and bought 4 new bolts put them in and got the car running again. The revs are still too high at 1050/1100 rpm but at least i can drive it.
Does anyone have any ideas as to why please?
There is a metal cylindrical shaped thing on the right hand side of the cyl head (when viewed standing in front of the car) there is a multiplug connected to it, would that be a egr valve?
Does this engine have an idle control valve?
Could it be the thermostat causing the high tickover? I ask because the temp rose to 90 when i was in traffic yesterday, i never noticed it do that before, or could it be that the multiplug from the thermostat is not working properly and i need the hard wire fix to do with the multiplug going from that thermostat?.
Confused and a little outta my depth!
The car accelerates really well and the economy is good. I have unplugged tha maf and the car will not start when i try it.
Phew, if you managed to read it all thanks and i'm sorry if i've missed something out.