The engine runs too rich on idle and I've got the 'high idle speed while moving' problem which I think is related to the first problem.
I'm using the AutoXray 6000 EZ-Scan tool to read out the ECU data.
I know the VHPD engine reacts quite sensible to faults like buggy sensor, vacuum leaks, etc. That's what I did already:
- - new temperature, cranking and manifold temperature sensor
- new MAP sensor which reads the same values so the old one was fine
- new wheel speed sensor and the ECU does shows the correct speed
- all new vacuum lines
- new iridium spark plugs + coil pack + high tension leads
- throttle position sensor has been renewed before and shows plausible readings between 0% and 100%
- new idle air control valve (IACV) and hoses
- new lambda sensor which shows the typical 'narrow band' voltage jumps
- balanced the throttle bodies
The following things are ongoing:
- - renew the manifold gasket as I suspect the old one to be faulty. Spraying brake cleaner on the joint did affect the idle speed.
- letting the injectors be refurbished by a local ASNU service
- 1. which manifold pressure do you see during idle? Mine reads 65 to 70kPa which I think is to high.
2. which short term fuel trim do you see while idling. I see -7.5% to -15% on my car which indicates rich running. The car does run in 'closed loop' after warming up.
3. does anybody know a source for the fuel pressure regulator? It reads MKW10016 on its housing and it should be a Rover part.
4. is anybody running the 190hp ECU together with a cat? The cat and the exhaust are getting really hot (500 to 600°C easily on the outside of the cat and still 250°C at the entry of the exhaust). The high temperatures are probably related with the rich-running problem and might disappear if that is solved.
5. Which air flow do you see when balancing the throttle bodies using a 'air flow meter' (idling at 1250rpm)? Either when running with or without IACV connected.
6. I couldn't find any torque setting or the tightening order for the manifold screws in the workshop manual.
Any input is highly appreciated.