cold start valve not working

hi guys, my golf still not running and the problem i found today is that the cold start valve isnt working, i ran a test on this by running a jumper across the fuel pump relay to run that without craking the engine, then took out the CSV and left the fuel line attached and connect bypass wiring one from the positive of the coil and the other to ground, turn on the ignition and it worked fine, but when i put it all back and cranked the engine nothing. i know thw valve works and that theres pressure there, so i could only assume that its the wiring to the CSV. even if u bridge the thermo-time switch, still nothing,

anyone have and ideas, or able to tell me more about the wring to this from the starter.

Bridging the thermo time switch is a very bad idea !!
I hope that you didn't crank the starter with it bridged ?

When the starter is running, 12v is placed on one pin on the CSV, however it will not fire unless the other pin in grounded, it is the job of the TTS to pull this pin down to ground.

The TTS will disconnect its W pin from ground and hence stop the CSV from firing when:
(1) The coolent is temperature is greater than 35 degrees C
(2) The other pin (G) has had 12v applied to it for greater than 8 seconds. This stops flooding when cranking and the engine has not started, the 8 seconds will vary on coolent temperature as it is a bimettalic strip the governs it. The G pin only has 12v when the starter is running.

As I found out last week (thanks rubjonny), later kjets also have a cold enrichment circuit that also makes use of the TTS and CSV.
There is a throttle switch and Vacuum Time Switch added to the circuit. The throttle switch has 12v applied to it at start and when the engine is running, when the throttle is open by more than .2 to .6 mm the 12v is applied to the other side of the switch and to the Vacuum Time Switch. When you blip the throttle the Plenum chamber experiences negative pressure momentarily which causes the Vacuum Time Switch to place 12v on to the CSV for about 0.4 second. So if the TTS is less than 35 degrees C, the CSV will run for a short period and richen the mixture.

hi, thanks for the reply, has made me think. If there isn't 12v going to the CSV where would the problem lie, would it be the relay or wiring from the starter to the fuse box?

have a look around the starter motor and see if you have any wires not conected,your starter should have two small terminals, 1 to power the cold start,the power to the cold start is only there when the starter is crankin and only when the tts say it cold enough,i have more info if you need, :dontknow:

anymore info would be great, having trouble getting the car going, ill check the connections on the starter. i need to get this going before i can moveon to anymore problems, if the CSV isn't working on cranking would that be the cause of the engine not firing and starting?

cheers

it wouldnt help it, but should evently start without the help of the cold start, i take it that you keep crankin and the battery goes flat??

The CSV can cause two problems:
(1) Always running which causes a flooding of the engine and poor starting - this is usually caused by the TTS failing.
(2) Not firing at all, which means that the engine will take slightly longer to start as the mechanical injectors take longer to open than the electrical CSV.

The CSV is not critical to starting the car, it just helps to start it faster from cold.

could i be having these problems because of the Fuel Relay, does the cold start circuit run through this. i still do need to a fuel pressure test which im banking on is the trouble i can't get it going, althrough i did a fuel delivery test at week end and enough fuel is getting up there. need to get this fixed and running before show session starts! ahhhh

if you turn the key as far as it goes without cranking,you should hear the fuel pump prime,if not then it could be the relay,it could also be a non working pump,if you serch for prowlers fuel injector test that should point as wot to do to with regaurd's the pump relay,how to by pass it,this will tell you if you just need to replace the relay,,if pump and your relay work  you need to start looking for a spark as to why a not start,hope this helps,