[santhoshx]

I have a LPG fitted 99 Zen. My mechanic advised me to use choke to start the car in petrol since it is giving me starting trouble in the morning. Usually I prefer to start engine on petrol and switch over to LPG. I am not pretty sure how to use choke. Once I pull the choke and start my car, am I suppose to drive with choke on for sometime or should I push it back immediately after starting.

How exactly choke is used and is there any issues in using it

[IndigoXLGrandDi]

How to check whether the Choke is operating or not in case of vehicles fitted with Auto Choke Mechanism?

We have a Scooty Pep (75cc- Not Plus) of July-2003. It has covered more than 60-70KKms. (Cannot specify exact because the Speedo was not working for some months).
The minimum temp. in our city goes @ 20 Deg. C during the night.

When it is started first time in early morning (before 9-10am), it gets started with 1st kick but gets Turned-Off if a little bit accelerator (Little Bit here means 4-5 mm of accelerator) is given. I have to wait around 30 seconds in that idle rpm and then the vehicle does not give any trouble thereafter throughout the day.

If the Pep is started after 11 am, the above problem does not show its face.

I have cleaned the Carburettor, but still the problem persists. Also even after disconnecting the Choke Connector, this problem is there.

How to check if the Choke that is fitted on the carburettor is faulty? I have enquired its price which is Rs.636/-

There is no voltage across the terminals of Female Connector of Choke after disconnecting the Male Connector from it.

I am confused. Please help.

[a4anurag]

Originally Posted by IndigoXLGrandDi

How to check whether the Choke is operating or not in case of vehicles fitted with Auto Choke Mechanism?

There is no voltage across the terminals of Female Connector of Choke after disconnecting the Male Connector from it.

I am confused. Please help.

Look at this link below. It may be of some help.

http://www.vw-resource.com/automatic_choke.html#trouble

Anurag.

[IndigoXLGrandDi]

Anurag, its too technical for me but one point given is To check for the Voltage across the Choke. Currently there is no voltage in our pep's case. I will check the wiring and see if I can sort out the problem.

[a4anurag]

Originally Posted by IndigoXLGrandDi

Anurag, its too technical for me but one point given is To check for the Voltage across the Choke. Currently there is no voltage in our pep's case. I will check the wiring and see if I can sort out the problem.

Apologies for the technical article but seeing your issue and reading the article that I posted, I feel you need to get the wiring checked first after which the further checking can be done.

Anurag.

[IndigoXLGrandDi]

Sorry for late update.

I switched On the Ignition and checked the voltage between the orange wire coming towards the Choke and Carburettor Body. The voltage came to around 12 V.

So does it mean that Choke is getting Supply but the former is faulty and need replacement?


Some more points I want to add-
1) I have to "pump" the accelerator (but very slowly and in very small proportions to avoid stalling the engine) and I have to wait for minimum 60-90 secs. before I can move.
The Cost of Choke Mechanism shown by Black outline in above picture is Rs.636/-.

[a4anurag]

Originally Posted by IndigoXLGrandDi

I switched On the Ignition and checked the voltage between the orange wire coming towards the Choke and Carburettor Body. The voltage came to around 12 V.

So does it mean that Choke is getting Supply but the former is faulty and need replacement?

The Cost of Choke Mechanism shown by Black outline in above picture is Rs.636/-

If your are getting 12V then the wiring is fine. IIRC there should be an element in the choke, so to check it:

1) First remove the power cable from the coil;

2) Then set a low value like 8-10 ohms (it must be in ohms);

3) Touch one probe to the element connector and the other to body of the Carb.

4) If you get any reading the element is intact; if you get no reading it's broken.

Even if the element is fine and the voltage obtained is 12V but the choke isn't working as it should, then do change it.

Rs 636 is a single time investment but it will get you peace of mind.

Anurag.

[IndigoXLGrandDi]

Originally Posted by a4anurag

1) First remove the power cable from the coil

If you mean disconnect the green connector of the Choke, then that is what I did and checked the voltage which came 12 V.

Originally Posted by a4anurag

3) Touch one probe to the element connector...

Could you please guide me as to which part are you referring? Is it the wire coming from Choke towards the Green Connector?

[IndigoXLGrandDi]

Yesterday I replaced the Choke Mechanism with New.

Still the problem of "The Engine feels suffocating" persists. Now what to do next?

[a4anurag]

Originally Posted by IndigoXLGrandDi

Yesterday I replaced the Choke Mechanism with New.

Still the problem of "The Engine feels suffocating" persists. Now what to do next?

Check the air filter and clean the carburettor once. Do it at an FNG rather than at ASC.

Anurag.

[IndigoXLGrandDi]

I have cleaned the Carburettor myself to eliminate the carburettor issue and then only I posted the query here. Sorry I should have mentioned it before.

Also I had cleaned the Air Filter not long ago. May be Max 1500 kms ago.

[a4anurag]

Originally Posted by IndigoXLGrandDi

I have cleaned the Carburettor myself to eliminate the carburettor issue and then only I posted the query here. Sorry I should have mentioned it before.

Also I had cleaned the Air Filter not long ago. May be Max 1500 kms ago.

Since you have cleaned it by yourself, hope you set the AFR screw in the correct position.

Do look at Spark plugs, if they haven't been changed.

Anurag.

[IndigoXLGrandDi]

AFR has been set to 1.75 Turns and the Spark Plug have been replaced around 2000kms ago. I have inspected and cleaned the Spark Plug around 500-600 kms ago.

[a4anurag]

Originally Posted by IndigoXLGrandDi

AFR has been set to 1.75 Turns and the Spark Plug have been replaced around 2000kms ago. I have inspected and cleaned the Spark Plug around 500-600 kms ago.

All seems to be fine then. What about fuel quality?

"Engine Suffocating" - Do you mean that, when you twist the throttle there is no response? Like Sluggish?

Anurag.

[IndigoXLGrandDi]

Originally Posted by a4anurag

What about fuel quality?
"Engine Suffocating" - Do you mean that, when you twist the throttle there is no response? Like Sluggish?

I fill petrol from the same bunk since past few years.
When the throttle was twisted more than 3-4 mm the engine would die. The engine needed some time to be stable. I would give throttle 2-3 mm (Approx) and gradually increase it depending on the behaviour of engine. If I feel that the Engine would be remain alive if the throttle is increased to 5-6mm, then I would slowly do the same. Then if I feel that engine has really awaken (this would take around 1min), then I would set off.
I think this problem has got solved. But still keep watch on this and update.