[humyum]

Guys since this is related to idling problem i ll put forward my query.My mamas zen which is a 2005 mpfi 996 cc model.
It has done 20000 km was serviced for the 20000 km service a week back.During which it was decarbonised/injector cleaned/throttle body cleaned/spark plugs replaced/engine oil changed.Everything is perfect with the car and when we had been for a trip to mahabaleshwar i noticed the idling to be too high.In 5th gear the car would easily reach 40 to 50 kmph without even touchin the accelerator with the A/C compressor kicked in.
And as doubted it was high.
It was 900 rpm without AC
and 1200 Rpm with Ac.
And the sah and sanghi guys at lower parel said that its perfect and idling rpm below this will cause the car to vibrate/shudder while releasing the clutch bla bla.I told him should it not be in the region of 800 without ac and around 900 with AC ..he said ' sir that is for carburated cars and not mpfi'
I have seen a friends baleno/indigo all having their idling rpms in the region of less than 1000 even with ac and around 800 without ac.So how is that different from a zen??
How much should the ideal idling rpm be for a mpfi zen with and without the ac?
And how to get it rectified?

[DirtyDan]

Originally Posted by humyum

Guys since this is related to idling problem i ll put forward my query.My mamas zen which is a 2005 mpfi 996 cc model.
It has done 20000 km was serviced for the 20000 km service a week back.During which it was decarbonised/injector cleaned/throttle body cleaned/spark plugs replaced/engine oil changed.Everything is perfect with the car and when we had been for a trip to mahabaleshwar i noticed the idling to be too high.In 5th gear the car would easily reach 40 to 50 kmph without even touchin the accelerator with the A/C compressor kicked in.
And as doubted it was high.
It was 900 rpm without AC
and 1200 Rpm with Ac.
And the sah and sanghi guys at lower parel said that its perfect and idling rpm below this will cause the car to vibrate/shudder while releasing the clutch bla bla.I told him should it not be in the region of 800 without ac and around 900 with AC ..he said ' sir that is for carburated cars and not mpfi'
I have seen a friends baleno/indigo all having their idling rpms in the region of less than 1000 even with ac and around 800 without ac.So how is that different from a zen??
How much should the ideal idling rpm be for a mpfi zen with and without the ac?
And how to get it rectified?

You are right, it is idling too fast. You might try just stabbing at the accerator pedal with your foot to see if the motor kicks down. And/or crawl under the dashboard and try to do a few quick on/off surges to the accelerator with your hand to see if that makes the motor kick down. Then see if you can pull the accelerator pedal up away from the floor with your hand and see if that slows down the idle. If these attempts lower your idle then you have a sticking accelerator linkage or pedal. You will have to get someone to lube it or replace the linkage.

If it is not a sticking linkage then you will have to get a mechanic to adjust the idle under the hood. Take it to different mechanics, the ones you mention obviously are not interested in solving your problem.

[Jaggu]

check owners manual for idle rpm, i guess it used to be mentioned there??

[kpzen]

Originally Posted by Jaggu

check owners manual for idle rpm, i guess it used to be mentioned there??

I don't think so. Even if its there, without a tacho its of no use isn't it ?

[breezydrive]

I somehow feel that this is happening due to engine De-carb.process done in last service.This was done for the first time, till now MASS was doing injector cleaning at 20k intervals.
I have read some views that HONDA does not recommend decarbonisation of engine as the process makes the piston rings brittle.Does MARUTI/ SUZUKI recommends the same?
I am feeling some roughness in engine after this process.
The system used was LIQUI MOLI engine cleaner (as per the bill) & it costed me Rs.1250
I am feeling cheated as the engine was smoother before the service.
Earlier the car was being serviced by MOTORCRAFT, i shifted to ROHAN MOTORS due to some reasons.
Can somebody suggest me some real good workshop in NOIDA/ DELHI for getting rid of my problem. Sadly, some of the MASS dealers just want to count the no.of cars serviced & total billing per day.

[wolfinstein]

Checkout Maruti Service Masters in Okhla, since its a company owned and operated enterprise,I'm sure service levels are by far much higher.

[breezydrive]

Thanks everybody for all the good advice!

As quoted by autopsyche in one of the threads upon De-carb. of engines

The Carbon Clean System works essentially this way: The fuel lines are removed from the engine and is hooked up to the machine which is sortof an alternative fuel pump and pushes the cleaner solvent and pterol mixture into the running engine, the car is kept running for about 15 mins, then a 15mins stop then another 15 mins of pumping, settinng and refitting takes another 15 mins so the whole process is an hour.

During the time the engine is running in the solvent is decarbonizing the deposits from the car right from the beginning of the fuel lines and into the (carbeurettor or injectors) and into the cylinder walls, being burnt like ur regular fuel and leaving the car as a normal exhaust fume. you can very well see the burnt carbon which has been extracted from the engine in the tailpipe which ends up with a smooth black coat of soot. The car should be run for about 5kms after that and then the spark plugs opened and cleaned once (to remove the desposits from the solvent). The engine actualy gets a thorough inside cleaning without doing an overhaul. It is not going to avoid u an overhaul since its still an external procedure, but regular use can definitely help u keep the engines health in good condition, as recommended, every 20k. The main advanadvantages are smoother running of the engine and original compression being restored.

Just thought after reading this that MASS ( Rohan Motors) might have not done the decarb. process properly hence the car was running with a chocked fuel supply leading to vibrations/ engine shrudder!

Took the car to a garage, got injectors, throttle body cleaned & spark plugs removed / cleaned, things are fine now!

Thanks autopsyche!