Edd's Nova Sport

[Edd]

I suspect so, I would squish the pipe and prove the theory first though...........

Will do mate, garage not being opened for a few days tho, might smash it up if i do

thanks for your help

[Novasport]

It was good to catch up with you yesterday Edd. I hope the diagnostic kit is of help to you with the injection issue.
I was having a read up of how the LE Jetronic works and as you have ruled out any air leaks I think the Auxilliary Air Valve(ICV) is the likely suspect.
You are right in saying the valve is electronically operated but it is also operated by radiated heat from the engine as Royston has pointed out.
The unit needs to be mounted on the engine for heat soak for it to operate and close. I think when the fault occurs you need to clamp off the hose between the AAV and plenum to cut off any possible air supply that would allow the revs to increase. If the revs drop down then the AAV position or the unit itself is at fault.

Some info I found about the AAV...

AAV
The AAV is used in vehicles that do not have any form of idle speed regulation. A thermal valve or mechanical gate control valve is used to increase the idle speed during cold engine operation. The AAV is mounted in a hose that by-passes the throttle plate.
The valve responds to temperature and allows extra air to by-pass the throttle when the engine is cold. Extra air entering the inlet manifold causes the idle speed to increase which prevents low idle speed and stalling with a cold or semi-cold engine.
During cold engine operation, the valve is open and so engine idle speed is increased. As the engine warms-up, the valve gradually closes until it is fully closed at normal operating temperature.
Essentially, there are two methods by which the AAV is opened: The valve may be opened by the rise in temperature of the coolant as the engine is warmed to operating temperature or the valve may be electrically opened.
coolant heated operation
The AAV is mounted in a by-pass hose carrying engine coolant. Once the engine has been started the thermal valve is heated by the rise in temperature of the coolant and slowly closes so that it is totally closed once the engine attains normal operating temperature. Radiated heat from the engine will affect valve operation, and allow the valve to remain closed when the engine is hot and is not being operated.
Electrical operation
The AAV resistance is connected to the relay output terminal. Once the engine has been started voltage is applied to the AAV resistance. The resistance is heated by voltage and the gate valve slowly closes so that it is totally closed once the engine attains normal operating temperature. Radiated heat from the engine will affect valve operation, and allow the valve to remain closed when the engine is hot and is not being operated.

[Edd]

Yeah good to catch up with you yesterday mate

Thanks for the diagnostic kit, put it to use Wednesday

Hopefully get it sorted once and for all

[Andy]

It plugs into the ECU and loom. There is a test relay etc. Looks a good bit of kit.
Saw one on ebay recently really cheap. I thought of you but then I thought you had fixed the issue so never contacted you about it.

Do these work with the bosch/siemens gte/gsi management too?

[Edd]

Small update

Put the injection test kit to use that Rich lent me
Found the wiring to the TPS was fcuked and that the reading from the CTS was constantly hot.

Bit more investigation and came to the conclusion that a 30 odd year old loom is no good

More help from Rich and ended up with this



Brand new Irmscher injection kit loom

Hopefully get it fitted over next few days and test again

I'm hoping this is going to solve the running issues

So still slowly getting there

Big thanks to Rich for all the help as well

[Andy]

will it work on gsi/gte then?
what loom do them injections run? they look a similar setup to gte/gsi

[Novasport]

The Irmscher injection is a Bosch LE2 system based loosely on the Mk1 Astra GTE/Mk2 Cavalier SRi 18e setup.
Irmscher built their own custom loom. I have a contact in Irmscher Germany and they managed to find me some new old stock looms for me and Edd.

[Novasport]

The tester will not work on the E16SE or C16SE management

[Andy]

Thanks for clarifying that rich.
Its just iv heard of a basic one like that specific to the gsi/gte and wondered if this was said diagnostic tool.

[Benn]

Brand new loom. Very impressive.