Running problem

11th September 2013, 19:39

I've had an idle problem with my VTS for a while (ive never driven the thing since buying it over 18 months ago)

when it starts i have to hold the revs to keep the engine running, i have to keep it at 1000 rpm for a short while before i can let off and it will idle. if i rev it and let it drop back to idle it will cut out. the engine revs clear no problem

i've changed the coil pack pack, MAP sensor and cleaned out the ICV and no change found

any other ideas people?

11th September 2013, 19:50

If you have only cleaned the ICV and not changed it then its probably the ICV at fault but not due to being dirty, just plain old knackered

the ICV is responsible for controlling the Engine rpm when coming off the throttle ensuring it returns smoothly to its idle speed. Start by replacing that

11th September 2013, 19:53

To the op is the problem only on cold start?

11th September 2013, 23:43

Quote:

Originally Posted by stevo67

To the op is the problem only on cold start?

no, when i run it for a good ten mins, fans cut in and out etc as should, turn off, turn on, same problem

i originally thought fuel filter but ignored this as the engine rev'd fine

11th September 2013, 23:44

Quote:

Originally Posted by SnakeVTR

If you have only cleaned the ICV and not changed it then its probably the ICV at fault but not due to being dirty, just plain old knackered

the ICV is responsible for controlling the Engine rpm when coming off the throttle ensuring it returns smoothly to its idle speed. Start by replacing that

should the ICV move at all? when i removed it and was cleaning it there is no movement at all all in the 'probe'

12th September 2013, 19:33

anybody any advice?

i'm ready to torch the cunt

12th September 2013, 20:06

The ICV will move when its plugged in, and it should move/adjust when the ignition is switched on, and while the engine is running it will adjust its self to suit the needs of the engine. Idle control valves aren't too expensive iirc , I got one from euro car parts for cheap.

12th September 2013, 20:20

Quote:

Originally Posted by SnakeVTR

The ICV will move when its plugged in, and it should move/adjust when the ignition is switched on, and while the engine is running it will adjust its self to suit the needs of the engine. Idle control valves aren't too expensive iirc , I got one from euro car parts for cheap.

should i be able to move it in my hand when i've removed it from the throttle body? i think it may well be seized which is why its not idling.

12th September 2013, 20:30

From personal experience when the icv goes its usually that the plastic threads are shredded off so it does not pull the cylinder in causing the engine to rev to around 1500rpm , which usually comes down to 1000 when you momentarily block off the throttle body.
Have you checked that your maf sensor is working properly?

12th September 2013, 20:48

The issues you describe for the ICV arent what im having, i basically cant get mine to idle

you mean the MAP sensor? i've took this out and cleaned it but havent replaced it for new

12th September 2013, 21:24

I know! These are the problems that i have seen with damaged icv's ,
for years my saxo will not idle and stall when cold but when warm it is fine ?!?! Still haven't found what could be the problem, yep MAP is what i ment

12th September 2013, 21:39

ah jesus, ill just change the map sensor and ICV for new tomorow and see what happens

is it possible this could be an electrical issue? bad earth, fuse issue etc something like that? im not clued up on electrics

14th September 2013, 00:31

Quote:

Originally Posted by deano_123

ah jesus, ill just change the map sensor and ICV for new tomorow and see what happens

is it possible this could be an electrical issue? bad earth, fuse issue etc something like that? im not clued up on electrics

It sounds more like a fault with a sensor rather than an electrical fault tbh. You wont be able to move the ICV by hand without forcing it, as its a stepper motor it has hundreds of different positions and has to adjust itself accordingly. If the motor becomes faulty then it can no longer control the idle speed causing stalling and other problems

14th September 2013, 18:36

sorted, new map sensor and ICV and it runs like a peach again

14th September 2013, 18:38

good you've sorted it, I was going to suggest a bad battery or terminals.

My GTI used to do exactly what you described, I had loads of stuff swapped and changed which cost a lot lol

6th November 2013, 16:49

Quote:

Originally Posted by deano_123

sorted, new map sensor and ICV and it runs like a peach again

started the car up today for the first time since this, flat battery again, ergh

anyway, ran the car for 15 mins at idle no problem, began to give it some revs, at high revs after left to drop back to idle the revs drop below 500 or the engine cuts out, it then starts again easy enough

what the bloody hell could this be now?!?!??!

6th November 2013, 19:47

Quote:

Originally Posted by deano_123

started the car up today for the first time since this, flat battery again, ergh

anyway, ran the car for 15 mins at idle no problem, began to give it some revs, at high revs after left to drop back to idle the revs drop below 500 or the engine cuts out, it then starts again easy enough

what the bloody hell could this be now?!?!??!

Are you actually driving the car? if you're sitting revving it and it's not been driven and had a flat battery previously that's what you'd expect

6th November 2013, 21:20

Quote:

Originally Posted by MartinObviously

Are you actually driving the car? if you're sitting revving it and it's not been driven and had a flat battery previously that's what you'd expect

erm how? i wouldnt expect any car to do that

the car hasnt left the garage in 18 months

7th November 2013, 20:16

Quote:

Originally Posted by deano_123

erm how? i wouldnt expect any car to do that

the car hasnt left the garage in 18 months

It's not any car, it's a french car.

8th November 2013, 07:20

http://www.saxperience.com/forum/sho...d.php?t=452130

try this mate might solve you problem obvioulsly u might have to push your icv in a bit instead of out because ures aint idling, mines was the oposite ot was idling to high, mines hasnt skipped a beat since doing that stuff in my thread

8th November 2013, 09:09

Quote:

Originally Posted by MartinObviously

It's not any car, it's a french car.

thanks for your useless input

8th November 2013, 09:18

I had the exact same issues as you, changed absolutely everything. In the end it just needed using lol, ran like an absolute dog until I started using it everyday, used to cut out at every opportunity.

8th November 2013, 09:37

Make sure firstly that the throttle Cable is not pulled tight which causes the throttle to 'open' a little. Then ensure that the throttle butterfly is returning to a closed-enough position.

If the throttle butterfly is being held a tiny bit open by the cable, or the adjustment, then the voltage from the TPS to the ECU won't go below the prescribed voltage to put the car into 'idle' mode and you will get issues. I think it's 0.6 or 0.7 volts you can check on a multimeter with the engine running by poking a sewing pin into the signal wire and measureing the voltage. speak to John at GMC for more info, he knows more about the stock ECU, but ironically the throttle may be set a tiny bit too far 'open'

8th November 2013, 18:29

Quote:

Originally Posted by luthor1

Make sure firstly that the throttle Cable is not pulled tight which causes the throttle to 'open' a little. Then ensure that the throttle butterfly is returning to a closed-enough position.

If the throttle butterfly is being held a tiny bit open by the cable, or the adjustment, then the voltage from the TPS to the ECU won't go below the prescribed voltage to put the car into 'idle' mode and you will get issues. I think it's 0.6 or 0.7 volts you can check on a multimeter with the engine running by poking a sewing pin into the signal wire and measureing the voltage. speak to John at GMC for more info, he knows more about the stock ECU, but ironically the throttle may be set a tiny bit too far 'open'

checked this, no issues with the throttle cable position or the butterfly being slightly open (i've had it apart again for cleaning)

i then ran the thing, again, for 15 mins at idle, then sat in revving it at varying levels for different lengths of time and then took it for a short few laps of the street (no tax)

still the fucking same!?!?!?!?!?!

8th November 2013, 19:16

Hi Deano, just to be as helpful as I can - the TPS isn't opened by the adjuster a little too much is it? It need to be below, I believe, 0.6volts when closed has that been tested too??