24v cosworth capri stalling problem help!

[69cossie]

can anyone help i bought a mk1 capri with a 24v cosworth boa engine and type 9 box the car is running great starts first time and drives great apart from the fact that every time  i slow down at a junction or even put my foot on the clutch and slow down it cuts out!!! its dring me mad no pun intended ive heard it could be the vss sensor? also it idles fine and i dont know if it would help but i cant afford to upgrade the gearbox to an mt75 hybrid at teh moment i just need a cheap fix is there any way of turing of the sensor?

[cossiemk2]

It has nothing to do with gearbox or vss.

Disconnect the idle speed valve.

Adust the throttle stop  so it runs at 500 rpm.

Then reconnect the idle speed valve.

The ECU would want to run at 650 rpm but adjusting the throttle the ISCV don't have to work as much.

[69cossie]

cheers man ill give it a go it seems to idle at about 600-650 at the moment would the strong smell of fuel have anything to do with the problem?

[TwinTurbo]

My 2.9 4x4 and 2.9 4i both cut out when aproaching junctions if the VSS was not connected.

TT

[TwinTurbo]

My 2.9 4x4 and 2.9 4i both cut out when aproaching junctions if the VSS was not connected.

TT

And according to the book " Ford Fule Injection and Engine Control "

Stratergy 8 Deceleration

"Air bypas open to avoid stall"




The only way to determin deceleration is with a G-Meter or to work out how fast you are going and if its decreasing... Hmmm The VSS perhaps..

TT

[TwinTurbo]

In fact the book gives a good description of the operation and the part played by the VSS.

TT

[capri v8 driver]

connect the VSS, so the ecu knows when you are decelerathing and there is also a cable (black/red) coming from ecu pin 2 to the switched side off the brake switch. when connected, the ecu knows when your are breaking.

[robrs2]

I had to move the throttle stop a long way to stop it stalling. But as said above I don't have the vss connected, lost the cable doh.

TT does the book say what affect the loss of airflow meter signal will do?

[capri v8 driver]

the engine will stall and drive like crap.

ecu pin 3 (yellow/brown) is the vss signal, than you need a 12v feed and a earth.

[TwinTurbo]

I had to move the throttle stop a long way to stop it stalling. But as said above I don't have the vss connected, lost the cable doh.

TT does the book say what affect the loss of airflow meter signal will do?

Don't know what the book says, but the management would go to limp mode using whatever data is left from the PIP, ECT  VSS and whatever else is left like the fuel rail temp...    

The 24V combines the IAT and Air Mass, 12V has the IAT in one of the meters.

TT