Jerks on Petrol only. On CNG car ok

gulan17s (gulan17s) 2019-06-18 23:55:08 +0500 #1

Dear brothers,
I have Japanese suzuki Liana 1.6 with Landirenzo CNG kit installed later. On CNG car is OK but when on petrol, it giving jerks when I press or depress gas pedal. What should I do to avoid these jerks?
Car is tuned well (Plugs, filter, sensors like MAP,VSS, throttle body cleaned )
Regards

ahmedstudio (Ahmed) 2019-06-19 04:22:42 +0500 #2

Get the fuel pump checked

sameerulhaq064 (Sameer Ul Haq) 2019-06-19 08:27:26 +0500 #3

Seems like your fuel pump is the culprit. Get it checked.

gulan17s (gulan17s) 2019-06-19 19:06:53 +0500 #4

Dear brothers,
The car run on petrol on highways/motorways fine (Gas pedal at one position). When I press gas pedal at low speeds the car seems to have a high pick/acceleration like jerk not a missing like jerk. and when I depress the gas pedal Its jerk is like suddenly from high pick to normal speed. So I think its not a fuel pump problem.
Any other suggestion plz.

ahmedstudio (Ahmed) 2019-06-19 23:24:08 +0500 #5

Get the fuel pump and fuel injectors checked.

akpakistan2016 (Ak Khan) 2019-08-14 15:43:48 +0500 #6

A.o.A my Honda City Idsi is jerking a little in cng mostly in 2nd and 3rd gear. In petrol it is not jerking but the acceleration time lags very much means as soon as i release clutch in 1st gear the accelerator does not work and the car rpm goes lower than 700 but in second attempt it starts working it does it every time in in lmostly lower gears only in petrol. My mechanic repaired all my ignition coils that were leaking current and the cng jerking problem got resolved for few days while the petrol acceleration problem persists. But after 10 days the car again started jerks in cng. Plz help me the air filter is clean, throttle body cleaned a couple of months ago and the leaking ignition coils were repaired with silicon adhesive, one of the coil was broken which was then repaired with the help of Magic Depoxi Steel.

pwuser151953039981 (Sajjad Ahmad) 2019-08-14 19:25:36 +0500 #7

Ignition timming too advance.

akpakistan2016 (Ak Khan) 2019-08-15 01:28:13 +0500 #8

How can i adjust ignition timing. I searched online about adjusting Ignition timing but all i got was adjusting timing in old cars having distributor while Honda City Idsi have no distributors and their timing is controlled through PCM. How can i adjust ignition timing of my car. Plz guide me