Self Tunning - Khyber G-10 (Plugs, valve clearance, spark gap etc)

[metalhead]

One more thing which I noticed after head gasket replacement is that the heater is working really good now. It wasn't throwing warm air for a month.

Have noticed any change in the temperature needle?

[cracked]

aoa all..i am having some minute problem with my khyber again
its timing has been set on petrol so when i run it on cng,the idle is perfectly stable but on low rmps,car misses too much,so ive to leave clutch paddle slowly..on high rpms it works perfectly fine.the air is blocked to make it run on cng cuz without blockage,car goes off instantlly..on petrol it runs all fine... PS i remove the blockage while running it on petrol and i get 12 kmpl in local and 15-16 on long..on cng i get 140-160 in 50L cylinder.
idle on cn and petrol is smooth.. just on low rpms,cng misses..ive tried all settings on cng kit i can do by myself..mechanic said to increase timing but then on petrol,it might strt dieselling so i dont wana do that..any other way out?

[metalhead]

@ cracked
you need STAP for proper timing on both fuel types.

@ fas133
waiting for results of the STAP you were installing...

[speedster_101]

Have noticed any change in the temperature needle?

Temperature needle is stable during drive now. Earlier it used to rise and fall without any reason during driving.

[smimad]

AoA, everyone. I bought 2008 Alto VXR. I dont know a lot about modifying cars but would love to modify its performance rather than the outer look. So from where should i start??

[ahsanonline]

aoa all..i am having some minute problem with my khyber again
its timing has been set on petrol so when i run it on cng,the idle is perfectly stable but on low rmps,car misses too much,so ive to leave clutch paddle slowly..on high rpms it works perfectly fine.the air is blocked to make it run on cng cuz without blockage,car goes off instantlly..on petrol it runs all fine... PS i remove the blockage while running it on petrol and i get 12 kmpl in local and 15-16 on long..on cng i get 140-160 in 50L cylinder.
idle on cn and petrol is smooth.. just on low rpms,cng misses..ive tried all settings on cng kit i can do by myself..mechanic said to increase timing but then on petrol,it might strt dieselling so i dont wana do that..any other way out?

nope...no way out other than correct timings for cng and no air blockage!

the way you are running cng now is like if you tried to run on petrol 10 degrees retarded.

Get an advancer. It solves all the hassles, all the problems, with complete peace of mind.

[fas133]

I have installed the timing retarder in my khyber and it is working accordingly.Static Timing on petrol is around 5 degree BTDC and on cng is 18 degree BTDC.

[cracked]

ahsan bhai
its a carb and distributor engine..i dont think it can have an advancer in it..farhan bhai has used STAP and seems to be ok with results.
farhan bhai,pictures?
i want a stap too!

[ahsanonline]

STAP = advancer (Timing Advance Processor)

for older cars such as mehran etc it retards timing when on petrol. basic achievement is that cng gets advanced timings.

so get it. and get good results and peace of mind.

[fas133]

@cracked
For STAP pictures check out this link.It also contains the wiring diagram that i followed.
https://www.pakwheels.com/forums/performance-modification-tune-up-preventive-maintenance/137308-self-tunning-khyber-g-10-plugs-valve-clearance-spark-gap-etc-77#post3206355

[metalhead]

I have installed the timing retarder in my khyber and it is working accordingly.Static Timing on petrol is around 5 degree BTDC and on cng is 18 degree BTDC.

Good work...

[cracked]

oh my bad..see thats what can happen when you dont know about car's stuff
anywho,now i know its advance r..
can i find it new? from where if so? and price approx?

[metalhead]

what are the possible reasons of smoke at cold start.

i usually warm up the engine for few minutes at idle rpm (using choke in winter) with no sign of any smoke. if i rev even say upto 2500 during these few minutes, i get smoke from the tail pipe and its too much. i had to take the car out of the porch immediately so found it to be not normal. i can smell that its engine oil. after few minutes it gets ok.

engine oil reduces not more than a quarter below the top level.

Please list the possibilities...

[smijaz]

what are the possible reasons of smoke at cold start.

i usually warm up the engine for few minutes at idle rpm (using choke in winter) with no sign of any smoke. if i rev even say upto 2500 during these few minutes, i get smoke from the tail pipe and its too much. i had to take the car out of the porch immediately so found it to be not normal. i can smell that its engine oil. after few minutes it gets ok.

engine oil reduces not more than a quarter below the top level.

Please list the possibilities...

Exactly the same case with me, no smoke while idling in cold morning start but if reved even a little bit during warmup it will start giving smoke with oil burning smell and i also have to take it out of the porch .
This smoke will clear out in about 5 minutes, later on no smoke the whole day even with high revs.

My diagnosis is weak valve stem seals of cylinder # 1 in my case coz their is little bit of oil around the plug threads only not on the spark tip area. The other two are completely dry the tip and threads everything.

I am just waiting to get some weekend free for the seal replacement.

[Potoharian]

My guess is that in your car radiator fan is in direct mode and electrical load idle up mechanism is not present or maladjusted.

Your engine is running cold most of the time so the oil is retaining crankcase moisture instead of steaming it out, engine is running rich and blow by will be excessive. So Check PCV also.

Check ground connection, plug wires and ignition timing. (For missing problem)

Connect thermo switch with radiator fan and if possible install thermostat valve. Dont forget to use coolant otherwise just forget whatever i have said. (H)

Thanks Ijaz bhai,
I have tons of questions for you
My radiator fan is automatic. But I am not sure if the radiator fan starts at the right time. I have noticed that when the temperature needle reaches the middle of the meter, it starts the fan.Is there a way to check if thermo switch is working correctly ?
Can you please let me know what is "electrical load idle up mechanism", and how to check if its working properly or its malfunctioned ?
Can I repair PCV my self ? Is there any thread explaining more about it, I have searched but couldn't find something good enough.
What diameter of wire is suitable to be used for ground connections, any specific brand ? How do i adjust the Ignition timing of my car ??
Last Questions, What is thermastat valve, how to install it ?

Looking for a positive response from you.

[harisiqbal1]

hello, i am new in pw but me pehle se is thread ko visit krta raha hn. i have a problem with my khyber me ne jab dashpot ka vacume pipe connect kya to wo badly idle krne lge both on petrol as well as on cng but jab me us ko remove krta hn to woh properly idle krne lagte h
what is the problem? kya dashpot faulty h

[smijaz]

Thanks Ijaz bhai,
I have tons of questions for you
My radiator fan is automatic. But I am not sure if the radiator fan starts at the right time. I have noticed that when the temperature needle reaches the middle of the meter, it starts the fan.Is there a way to check if thermo switch is working correctly ?
Can you please let me know what is "electrical load idle up mechanism", and how to check if its working properly or its malfunctioned ?
Can I repair PCV my self ? Is there any thread explaining more about it, I have searched but couldn't find something good enough.
What diameter of wire is suitable to be used for ground connections, any specific brand ? How do i adjust the Ignition timing of my car ??
Last Questions, What is thermastat valve, how to install it ?

Looking for a positive response from you.

1: Thermo switch for radiator: I think the thermo switch is working ok, as they rarely fall bad. But you can check it by running the engine with radiator cap removed. Use normal mercury thermometer or electronic one and put it (incase of electronic one its probe) in the mouth of the radiator. Note the reading when the fan kicks in. It should be around 90C to 95C.

2: E load idle up: There is an electric solenoid valve (2 ports connection) near the upper engine mount alongside timing belt cover. One port is connected to vacuum hub on the intake manifold and the other is connected to a diaphram on the upper right corner of the carb (near brake booster). When ever any of the following are turned on
1. head lights
2. parking lights
3. rear defogger
4. a/c , heater blower
5. radiator fan
The solenoid allows the vacuum to pass and to actuate the diaphram on carburetor which in turn slightly increases (stabilizes) the engine speed (rpm) to compensate for the electrical load on alternator.

1. PCV: I dont think the PCV unit in khyber is repairable. You can spray in carburetor cleaner while the engine is running (with rubber pipes removed along with air cleaner container). You should feel vacuum when you place finger on it while engine running. You may also hear a minor metallic click when you place and remove finger from over it. Other wise replace it. estimated cost of used unit is around 150 and if by chance you find a new OEM one it will be around 800.

4: Ground: Use good quality 60A load capacity copper wire. No specific brand i know of.

5. Ignition Timing: Ignition is set with the help of timing gun. 10-12 BTDC for petrol and 18-20BTDC for CNG. Timing gun is available starting from rs. 1400 in Lahore.

6: Thermostat valve: Is a mechanical valve with a mechanism which allows it to open when the coolant temp reaches a certain limit and makes way for the coolant to pass through the radiator. In closed position it forces the coolant to bypass radiator. It helps in regulating engine temperature with in optimal range and also provide essential resistance in flow which causes a pressure effect making the coolant to properly collect heat from around the combustion camber.

I will explain the installation process in detail later.

[smijaz]

hello, i am new in pw but me pehle se is thread ko visit krta raha hn. i have a problem with my khyber me ne jab dashpot ka vacume pipe connect kya to wo badly idle krne lge both on petrol as well as on cng but jab me us ko remove krta hn to woh properly idle krne lagte h
what is the problem? kya dashpot faulty h

The function of dashpot is to eliminate the jerk between shifts in manual transmission vehicle by briefly holding the the throttle and slowly release it to idle. This function is controlled by a slow release valve in between.

My guess is that the daskpot diaphram is leaking. You can check it by connecting a longer pipe to it and suck it to see whether it works or not.

If its leaking then replace it and in the mean while plug the vacuum pipe.

[metalhead]

hello, i am new in pw but me pehle se is thread ko visit krta raha hn. i have a problem with my khyber me ne jab dashpot ka vacume pipe connect kya to wo badly idle krne lge both on petrol as well as on cng but jab me us ko remove krta hn to woh properly idle krne lagte h
what is the problem? kya dashpot faulty h

IMO your dashpot plunger was pressing the throttle a little when disconnected. and the idle rpm was set by this dashpot instead of throttle idle set screw. when you connected the dashpot, the dashpot plunger retracted and the idle rpm went down.
Simply set the idle rpm on petrol from the carb idle set screw and then do the gas setting from the cng regulator.

Also check the dashpot and slow release valve for proper working. Mine valve was clogged.

[harisiqbal1]

The function of dashpot is to eliminate the jerk between shifts in manual transmission vehicle by briefly holding the the throttle and slowly release it to idle. This function is controlled by a slow release valve in between.

My guess is that the daskpot diaphram is leaking. You can check it by connecting a longer pipe to it and suck it to see whether it works or not.

If its leaking then replace it and in the mean while plug the vacuum pipe.

ok thanks, inshaallah i will check it today
and by the way is dashpot diaphram available in the market?
if yes then what we call it in local mechanic terms