sahara1

Hi i have a ford 1.7 16 v 2001 panther puma when i start this from cold the choke does not come on does anybody no the location of the choke
and where to find this please .if you have pictures of what it looks like it would be most greatfull and how to test this also.

foreigneRS

modern cars don't have chokes on carburettors you know - they have this thing called electronic fuel injection. a sensor tells the ecu that the engine is cold so when starting it puts more fuel in than when starting from hot and when running adds more fuel whilst the temperature is cold and maybe opens up the idle air bypass a little to raise the idle.

what is the problem you have?

sahara1

HELLO thankyou for the reply when i come to start from cold the choke does not kick in it attempts to idle very low almost stalls,where will i find this sensor please and how will i test this please.

I also have an other issue the IAC comes up with the fault code P1504
when i plug this up i have change this for 2 brand new ford IAC and i still keep getting this fault also and ive even check the wiring striaght back
to the ECM and the voltage is reading good. PLEASE COULD YOU HELP

martysmartie

iTrader: (1)

As said a choke is a device on a carburettor, which, when activated provides a richer mixture for startup, as well as increasing the idle speed!

Your problem seems to be the ISCV, basically the ECU opens a valve by a desired amount to increase idle speed, did you reset the ECU after replacing the valve?

Martin

sahara1

Hi thank you for your response , when we replaced the IAC twice and we reset the ecu ,of which it clears this but it still comes up with P1504 fault
after a few miles driving.
Are you saying the throttle position sensor what is attached to the throttle body is causing the fault.??

Reference to the cold start /auto choke it will not idle from cold when first started,i cant find and get the choke to kick in at all we have changed numerous items on the engine even check for air leaks also.the parts changed was cambelt,plugs,coil pack,leads, filter,and we have
taken the battery off for a full night and even the fuse for the ecu to try to re-set this.
When the car warms up it starts and idles fine, apart from
odd stalling when aproaching juctions now and again.

foreigneRS

you're hard work - there is no choke

Chaz888

Test your temp senders

martysmartie

iTrader: (1)

I don't think it's TPS related, as you say that code indicates the ISCV circuit.

Air compensation is provided by the ISCV, hence why you have idle issues and stalling as the ISCV isn't working properly, where did you get the replacement from?

Martin

sahara1

I understand there is no choke it is called a cold/start which put more fuel
into the engine when starting this from cold of which i have 2 issues the one i have just mentioned it wont kick in the cold start allowing the car to idle at slightly higher revs until it warms up then once it is warms it idles fine.

And the other issue is the ford fault code P1504 IAC malfunction we have tested this and replace this for 2 brand new ford ones of which no joy we have checked the wiring from the IAC valve striaght back through to the ecu and the voltage seems to read fine, we have checked all vacume pipes cleaned the carb and tested and cleaned the MAF unit also and even put a second hand working one on from another puma.
we are stuck with both of the above problems and we can't resovle this any help would be most greatfull

sahara1

I understand there is no choke it is called a cold/start which put more fuel
into the engine when starting this from cold of which i have 2 issues the one i have just mentioned it wont kick in the cold start allowing the car to idle at slightly higher revs until it warms up then once it is warms it idles fine.

And the other issue is the ford fault code P1504 IAC malfunction we have tested this and replace this for 2 brand new ford ones of which no joy we have checked the wiring from the IAC valve striaght back through to the ecu and the voltage seems to read fine, we have checked all vacume pipes cleaned the carb and tested and cleaned the MAF unit also and even put a second hand working one on from another puma.
we are stuck with both of the above problems and we can't resovle this any help would be most greatfull

Chaz888

Check the temp sender(s) if they are not right it wont know the correct temp and the cold start system wont work right

sahara1

Hi thank you for that a pressume you mean the air temp sender which is
on the manifold which is near the IAC valve.

martysmartie

iTrader: (1)

No, I don't think you will have a ACT, the sensor for temperature input to the ECU is known known as the CTS (Coolant temperature sensor)

On yours it's actually a CHT sensor, it measures the temperature of the cylinder head itself, it's between plugs 2 and 3 (You see an electrical connector?)

Personally I don't think it's that.

It sounds like your cold start is ok, it's just the idle control circuit that isn't!

Martin

sahara1

But im not sure what to do next, the IAC valve we cant get to work even tho the voltage is okay but saying this would that prevent the cold start from working also

martysmartie

iTrader: (1)

Not really, as the ISCV is just one part of it, the enrichment side sounds like it's working fine.

Tbh it may be worth asking a specialist, as you can carry on throwing money at things that arn't broken. It may even be a faulty PCM.

It's kind of hard to know the voltage is ok as it's controlled by PWM, it's impossible to judge accuratly with just a multi meter, an ocilliscope or NOID light is a better bet.

It's worth removing the valve and blanking the hole with another (If you still have one) or something else, just so long as it's substantial so it dosen't get sucked in, and visually examine the valve operation.

Martin

sahara1

I have got a old one /so if i put this in replace of the new one how would i test the new one because it need to be sealed doesnt it.

martysmartie

iTrader: (1)

No, you could connect it and visually inspect the operation of the valve, so long as the "hole" left by it was blanked off otherwise the engine will rev right up.

Martin

sahara1

Hi we have put a old one over the hole and left the other plugged up to the cable there is power going to this but the is no movement signs on the new IAC vavle when engine is running

martysmartie

iTrader: (1)

Was this on a cold start I presume?

It seems very strange, try putting power directly to the valve, it should open completly when you do so.

Martin

sahara1

Yes ive tried a wire striaght to the positive side of battery with the origanal wires still attached before i taken this off and it worked as i could ear the vavle open and closing when touching the positve side of the battery when i kept touching on and off.