Mehran speed lost in 4th gear

tassaddaq.sultan8 (Tassaddaq) 2021-07-05 23:37:39 +0500 #1

Hi
Mehran 13 VX (aftermarket AC) (Petrol Only)
Mehran motorway pe 120 se sahi chalty chalty 60 pe aa jati ha, phi jitna marzi accelerator de do oper nhi jati speed na RPM barhati ha kuch der bar bad sai b ho jati phr 120 130 aram se chali jati ha. Kia masla ho skta ha?
Clutch plates bilkul new hain.

xzap042 (xzap042) 2021-07-06 00:12:37 +0500 #2

It could be overheating. Mehran is not supposed to be driven constantly at 120km/h with its 4 speed gearbox

tassaddaq.sultan8 (Tassaddaq) 2021-07-06 00:23:50 +0500 #3

Is se pehly kafi dafa 135 pe constant chalai ha kbi problem nhi i.

uzeemujeeb (MUZ) 2021-07-06 10:05:02 +0500 #4

sir what is odo meter reading & maintenance history as oil change interval transmission oil change interval clutch plate pressure plate thrust bearing change etc etc . All these require replacment after certain no of kms running.

tassaddaq.sultan8 (Tassaddaq) 2021-07-06 18:25:04 +0500 #5

every thing is fresh,
Engine Oil is good (changed every 4000Kms)
Transmission oil is new
PressurePlate/clutchPlate/Bearing are New
Filter is little old but not blocked.

ZainMahdi 2021-07-06 20:36:58 +0500 #6

Low initial ignition timing can cause this. Did someone fiddle with the distributor?

Stock timing is 7 degrees BTDC.

tassaddaq.sultan8 (Tassaddaq) 2021-07-06 23:13:55 +0500 #7

No one fiddled ,
I was travelling from Islamabad to sargodha. it worked fine 110-130 normal speed smoothly.
It was working fine on return i stopped at bhera rest area due to rain and strong wind when i started again since then its showing this problem.
Can dust or rain cause this?

uzeemujeeb (MUZ) 2021-07-09 09:44:31 +0500 #8

you shall check the air cleaner box it may have some debris or a badly choked air filter