Cultus efi jerks when release accelerater

abdullahxsheikh77 (Abdullah Xheikh) 2018-03-28 01:16:43 +0500 #1

Hi.
I am very much fed up from the problem of my cultus efi 2008 it starts jerk when i release the acceleration and when i again accelerate after 3,4 jerks its become smooth. I have almost checked every electrician mechanic i don't know what to do with it. Change many things.
TP sensor
Fuel pump
Fuel filter
Oxygen sensor
Throttle body
Spark plugs
Spark plugs wires
Ignition coil.
Please suggest me any experience man so i can rid of from these jerks.

Hassan1991 (Electrical Engineer ) 2018-03-28 01:31:14 +0500 #2

check map/maf sensor.

abdullahxsheikh77 (Abdullah Xheikh) 2018-03-28 01:36:39 +0500 #3

I have also replaced it. No result.

Hassan1991 (Electrical Engineer ) 2018-03-28 01:40:20 +0500 #4

i got 5afe with bigger throttle body this happens with me when car is cold.
reason is that ecu is mapped with the stock throttle body when is accelerated mixture become unbalance at first but then map sensor helps ecu to cover up and missing gone.

abdullahxsheikh77 (Abdullah Xheikh) 2018-03-28 01:40:25 +0500 #5

As i start the car in the morning, car drives smoothly. As i drive 1,2 km it starts jerking.

Hassan1991 (Electrical Engineer ) 2018-03-28 01:46:44 +0500 #6

have you tried resetting the ecu?

abdullahxsheikh77 (Abdullah Xheikh) 2018-03-28 01:46:49 +0500 #7

Any expert mechanic do you think in lahore. So i will there. The electrician also connect it with scanner only tp sensors values found out. You're saying should i again change the maf sensor? Its normal showing in scanner. I'm very much puzzled. I appreciate your replies. Thanks.

abdullahxsheikh77 (Abdullah Xheikh) 2018-03-28 01:48:31 +0500 #8

Yes and i think there also bi problem at the choke sensor side. Because today mechanic unplug it and plug it, the car drives smooth as 1,2 km but after it again jerking.

Hassan1991 (Electrical Engineer ) 2018-03-28 02:06:15 +0500 #9

then drive the car with unpluged. to check.

Hassan1991 (Electrical Engineer ) 2018-03-28 02:07:33 +0500 #10

your saying that scanner show TPS error?

abdullahxsheikh77 (Abdullah Xheikh) 2018-03-28 02:08:28 +0500 #11

Yes TPS error
I replaced it and error gone away. But problem is still there.

Hassan1991 (Electrical Engineer ) 2018-03-28 02:12:18 +0500 #12

did you get scanned after replacing the sensor?
sorry i never took my car to any mechanic so don't know.

abdullahxsheikh77 (Abdullah Xheikh) 2018-03-28 02:19:31 +0500 #13

Yew again scanned it. It shows everything is normal. Really feel irritating while driving it now.

Hassan1991 (Electrical Engineer ) 2018-03-28 02:26:42 +0500 #14

have you checked the distributor timing?

abdullahxsheikh77 (Abdullah Xheikh) 2018-03-28 03:38:13 +0500 #15

Yes already checked.

nnabeel (nnabeel) 2018-03-28 14:17:48 +0500 #16

can u post the pic of choke sensor.

Hassan1991 (Electrical Engineer ) 2018-03-28 16:15:57 +0500 #17

@hassantahir2

hassantahir2 (Hassan Tahir) 2018-03-28 17:17:19 +0500 #18

@Hassan1991
^^I have never tried to mess with any EFI car.
They go straight to workshop for such work's.

hassantahir2 (Hassan Tahir) 2018-03-28 17:25:00 +0500 #19

Obama car care 0321 4106898 in tipu block garden town, Lahore.
Check this workshop some senior pakwheelers are recommending this.

Hassan1991 (Electrical Engineer ) 2018-03-28 18:09:34 +0500 #20

bhai muja efi cars zeyada easy lagti haien. carbs are much difficult to maintain. efi cars are straight forward.
@abdullahxsheikh77 have you tried driving without IAC?