Originally Posted by friendz14
Firstly thank for all expert advice given in the site which has helped me understand my car Much better.
I have 3 year old Wagon R CNG which has been a very good ride barring last 2 month. I have been facing few problem which i have listed down and would like you expert advice on the same.
1) While driving in Petrol, Pick up of car really goes flat as soon as I reduce my speed while driving over speed breaker or slowing down. this was not a case 2 months back.
and While in CNG mode the car is getting stalled.
2) Also found car is vibrating more than usual while I am waiting on traffic signal or is in idle State for few secs Seems to be knocking a lot . This also cause car to stall sometimes.
Now my car has driven a lot i have done around 50k Km till date and also last month,
I had mentioned this issues with the technician in local MASS center while giving my car for servicing, they did some tune up and and for days Car stopped stalling in CNG but PICK issues while driving in petrol mode and vibrating issues remained.
I was advised by my friends to take to bigger servicing center like Automotive in Nerul now which may help me out with my problems.
But before going there i needed some help or advice to understand what could be the problem as My experience withe these large service centers for my earlier car was not great. I have been made to paid for some work which i later realized it was not necessary.
Thanks in advance.
In ecu cars, both cng and petrol treated in same way.
Its the ECU does the job controlling it.
If you have a obd device
Please connect it and
Check the fuel trim data.
If long term fuel is more than 20~
Or less than 20~
There is a issue.
If LTFT (long term fuel trim) is getting near zero ie .if its negative it goes to less Negative or if its plus 20 it gets near 0 by decreasing the value when throttle is pressed and level up to 2500rpm.
Note the value.
Note the idle value
Note the MAF sensor value
And let me know ill find whats the problem in it.
May be sensor like cam or cam may be in last stage.
Keep updating. Ill help you out