i have a corolla 2.0D saloon, 2003 which has started to create problems when i took it to Pakistan tour in January 2015, before that engine had no issue whatsoever and used to start normally in single glow time and single self.
few things to notice before i mention the problems are, CSD is operational and pump and nozzles are calibrated from Cummins PK and it is timed with dial gauge, fans are auto, valve clearances as per manual i.e. 0.28-0.30mm.
1 - Cold Starting problem with missing, knocking and white smoke - [SOLVED post#25] - does not start when engine is cold and if push started it produces a lot of white smoke and knocking, before the tour i changed its glow plugs as old plugs were taking about 8,9 seconds to fully glow up while new ones were glowing in 6 seconds, cold start issue was initially because of a weak wire from battery to glow plugs, after changing the wire problem was slightly resolved and engine used to start after 3 glow timers but later on it totally refused to start irrespective of the glow timers.
my electrician took out the glow plugs for checking purpose and found oil on the 1st and 3rd glow plug from the pulley, i also feel that knocking sound i also from the 3rd cylinder or somewhere near it.
yesterday i checked the resistance of glow plugs and it was found to be 0.4-0.5 ohm of all four plugs so i again installed old glow plugs whose resistance was varying from 0.9-1.8 ohm and today morning i gave 3 glow timers and it started with 4,5 self and knocking was there but much reduced on old glow plugs.
2 - Starter motor - [SOLVED post#11] - Mechanics say that the starter motor is taking load and not rotating the engine at the speed it should to start it that's why the engine does not start in cold, i do agree with them to the extent that starter motor is somehow slow but it was starting the engine without any knocking n missing and still it starts the hot engine perfectly, now even if i push start it, engine misses and knocks on cold.
- while i was on the tour, car's 5th gear suddenly came to the position between reverse and 5th just as i left accelerator, when engaged it again into 5th and left clutch there was some sound from the gear it again came between 5th and reverse so without taking any risk i drove it in 4th gear all the way to Karachi. now showed it to a gear mechanic n he said 'faag kat gai hai isski' and if i forcefully keep it in 5th while leaving clutch it'll work fine and the same happened, now i have to hold the gear while leaving clutch in 5th gear.
-speedometer sensor is installed in gear and its not working properly because original 'garari' of #32-27 is not available. when i cold start it the speedometer doesn't work, after a drive of around 5-7kms speedometer slowly starts working but does not show accurate speed like if i am driving on 60 speedometer will show 50 and if i keep the accelerator pressed speed needle stays constant on wrong speed while if i leave the accelerator the needle starts dancing between 10-20 when actual speed is 30, between 50-60 when actual speed is 70, etc
-gear gets hard if the ambient temperature is high or if driven with ac or the car is continuously driven on high rpm like when 5th gear wasn't being engaged so while driving on 4th gear rpm was above 3000 rpm n gear got hard, and it is not only hard it gets extremely hard to shift it, however its perfect when cold or driven without ac or on low rpm.
last year i thought that my car had starting issue when its hot because the starter acted as if battery is down when starting on engine's optimum temperature but i was wrong and found that if i start the car with clutch pressed the starter would act normal so it means the hard gear also makes the starter motor work slow.
-considering the above problems shall i replace the gear or get it repaired ? and idea of its cost ?
@Xulfiqar bhai and other senior members kindly help.