Ask Xulfiqar - An Automotive Encyclopedia

[Xulfiqar]

Thank you for the reply

One more thing, while the car is on (not the engine, when the key is at position 2) it does not turn on the headlights at all. It does turn on "parking lights" but the low, high beams nor the fog lamps. Can that be attributed to the battery being down? When the car turns on, the lights do fluctuate for a second though.
I know how to reset the service indicator; press call receive and OK button at same time for 5 seconds and it displays a hidden menu to enable dyno mode, Assyst etc.... Go to service and just press OK on the service you want to reset the indicator for. I'm not gonna tell him that though; if he finds that out, he's literally gonna destroy the car.

The brakes work fine though, how can one tell if the ABS is module is shot?

Thank you.

the headlamps will only illuminate when the engine has started, this is done to prevent the battery from draining out as the headlamps do suck a lot of amps.

to test the ABS module, any good scanner can see if an error was thrown, meanwhile an SDS, autologic (high end two way tool) can command the ABS motor to work and you can individually test each wheel.

you should have the ESP error checked - e.g. if the brake pedal travel sensor is malfunctioning - it may cause the gear shifter stick to lock in park - its really an irritating moment.

[Xulfiqar]

Kindly let me know which obd scanner to get for the 99 w202 chassis is it obd2 compatible?
Also i have decided to get the whole tranny conductor plate with the filter changedI am planning to even get the selonoids changed maybe that will get that 1st to 2nd jerk sorted out what do u say

first - please check the adaptations of the clutches on a SDS, if the adaptations are showing a number higher than 5 - the clutches are worn down). After experience of rebuilding these boxes I can tell you that MB did dial in some shift shock when transitioning from 1-2 gear in S mode of the transmission. There is minimal slip. It can be greatly reduced by a rebuilt torque converter. The clutch plates inside the converter wear out and can cause drag which gives a feeling of "bump shift" - this is felt more when the ATF is a bit cold and thicker.

If you connect the SDS tool and then command the torque converter clutch to permanently deactivate - you can conclude if the problem is in the converter or the valve body or the clutches.

Even after all that - do not expect it to shift like a General Motors transmission. If you are concered about the shift then select the W program, it starts in 2nd gear and has really lazy shift pattern like a GM transmission.

The solenoids in the unit are pretty heavy duty and usually dont wear out. You can swap the 2-3 with the 1-2/4-5 shift solenoid - the 2-3 gets used the most.

If you do plan to replace the solenoids then carefully measure the old and new ones. the new ones are a bit taller, ergo if you fit the old filter screens on them - they will crush and cover the exhaust ports of the solenoid and you will be scratching your head on what happened.

the conductor plate is replaced when either of the 2 speed sensors die or someone broke the connector which locks the wiring plug. I have found that adding an external cooler to these gearboxes really do relax the plate as a bit more gentle ATF is dousing it rather than searing 100C+ ATF

[Marschall]

i doubt somebody here can do a torque converter rebuilt and you r right about the issue of cold Atf.Never knew about the shift shock thats new for me.Lets see if i can convince the guys at Shahnawaz to do this job for me.

P.S In terms of reliability how would you compare a M112 vs bmw m54b25 i6

[Xulfiqar]

i doubt somebody here can do a torque converter rebuilt and you r right about the issue of cold Atf.Never knew about the shift shock thats new for me.Lets see if i can convince the guys at Shahnawaz to do this job for me.

P.S In terms of reliability how would you compare a M112 vs bmw m54b25 i6

rebuilding a torque converter requires special tooling like a cutting lathe, a rotating welder, depth tools and a dyno to test it. There is no facility in Pakistan that can do it. and putting in a new conductor plate on the valve body is not rocket science. The valve body on the 722.6 gearbox is not hard to remove, just be sensible with cleanliness and torque requirements of the mounting bolts as it uses no gasket between the transmission case and itself. If for some reason you need to clear the transmission computer fault codes, you need a bit expensive scan tool. a reader wont touch it.

IMO - the M112 engine is really a long runner, its not the smoothest engine, but has a boatload of torque in the mid rpm range (where you actually use it) the BMW M54b25 is also nice, but on a different scale - its a peaky engine like the old mercedes M104, smooth as refined whipped cream and sound like a hand made machine.

[wasim625]

If u are in lhr then I can suggest u a good person having exp on carby..

Yes, i am I'm Lahore, go ahead.

[ehhaq]

Yes, i am I'm Lahore, go ahead.

Bro. This was not for u. The guy who was disscussing carby problem of his cultus was on my focus.

[Awais_jan]

Need help
After alignment , air bag light start blinking , I disconnect the battery for whole night but problem is still there , what to do with this
Car is nissan march 1999 , 1000cc

[avaiz84]

@xulfiqar bro its my humble request to guide me a mechanic which is best in your knowledge in Karachi for Charade

[Fahad.Ayub]

Xulfiqar bhai would flushing/replacing the power steering fluid get rid of the groaning/whinning noise ? or should i just get the pump replaced ?

[argtr65]

Xulfiqar bhai would flushing/replacing the power steering fluid get rid of the groaning/whinning noise ? or should i just get the pump replaced ?

Cleaning of power steering pump could resolve this issue,otherwise you will have to replace the p.s.pump.Just only replacing fluid will do nothing.

[searchingeyez]

@xulfiqar kindly reply me for poor mileage

i have replaced air filter, original spark plugs, throttle cleaning,no cel, vaccum is also fine(when i place hand on throttle body engine shut down)

but still bad mileage ..i m getting almost 6-7 km/litre but no deposits on spark plugs no black smoke..

i have d14z2 engine with it's default injectors on ecu of city 99 and old engine was d15b2.i think old engine also uses the same injector size of 180cc. its obd1 no oxygen sensor is there.
kindly let me know what could be the issue of bad mileage

[MatapatapAAA]

Question.

Topic = general engine function.

I have a suzuki swift DX.

Scenario=
Driving along a large empty road at 80 kmph , with a left turn about 300m ahead.

Rolling start

car is in 5th gear, going at 80kmph.

driver applies brakes, car slows to 60kmph. Brakes are released.
clutch is engaged, driver switches to 3rd gear and revs up the engine to 6k rpm and then disengages clutch. Gear change is successful and there is no jerking etc. ( rev-matching )

The car starts to turn, and the brakes are not applied. accelerator is not applied from here on forward.

the car slows down via engine braking during the turn and midway the brakes are slightly used to fine tune the speed/deceleration .( engine braking )

While the car is slowing down via engine braking, is there any fuel input to the engine? Is the engine burning any fuel? the movement of the wheels themselves is enough to keep the engine revolving, so hence is there any more fuel being shot into the cylinders?

[argtr65]

[QUOTE=MatapatapAAA;4947925]Question.

Topic = general engine function.

I have a suzuki swift DX.

Scenario=
Driving along a large empty road at 80 kmph , with a left turn about 300m ahead.

Rolling start

car is in 5th gear, going at 80kmph.

driver applies brakes, car slows to 60kmph. Brakes are released.
clutch is engaged, driver switches to 3rd gear and revs up the engine to 6k rpm and then disengages clutch. Gear change is successful and there is no jerking etc. ( rev-matching )

The car starts to turn, and the brakes are not applied. accelerator is not applied from here on forward.

the car slows down via engine braking during the turn and midway the brakes are slightly used to fine tune the speed/deceleration .( engine braking )

While the car is slowing down via engine braking, is there any fuel input to the engine? Is the engine burning any fuel? the movement of the wheels themselves is enough to keep the engine revolving, so hence is there any more fuel being shot into the cylinders?[/QUOT

How is it possible that an engine can run without fuel?ofcourse it is consuming fuel.

[MatapatapAAA]

[QUOTE=MatapatapAAA;4947925]Question.

Topic = general engine function.

I have a suzuki swift DX.

Scenario=
Driving along a large empty road at 80 kmph , with a left turn about 300m ahead.

Rolling start

car is in 5th gear, going at 80kmph.

driver applies brakes, car slows to 60kmph. Brakes are released.
clutch is engaged, driver switches to 3rd gear and revs up the engine to 6k rpm and then disengages clutch. Gear change is successful and there is no jerking etc. ( rev-matching )

The car starts to turn, and the brakes are not applied. accelerator is not applied from here on forward.

the car slows down via engine braking during the turn and midway the brakes are slightly used to fine tune the speed/deceleration .( engine braking )

While the car is slowing down via engine braking, is there any fuel input to the engine? Is the engine burning any fuel? the movement of the wheels themselves is enough to keep the engine revolving, so hence is there any more fuel being shot into the cylinders?[/QUOT

How is it possible that an engine can run without fuel?ofcourse it is consuming fuel.

Normally, the fuel goes into the cylinders and is burnt to push the cylinder head downward, resulting in revolution of the crankshaft.

However when a manual car is push started , the wheels rotating are suddenly connected to the crankshaft after the clutch is disengaged, and this rotates the crankshaft, and starts the engine. Even though the engine is not "running" at that time( through the use of fuel ) , but due to the wheels force rotating the crankshaft is still causing the cylinders to move up and down.

When the car has rev matched correctly and the engine rpm is high, ( but decreasing as engine braking is slowing down the car ) is there any input of fuel? The cylinders are still going up and down, and since the accelerator has not been pressed there is no demand for more power via the fuel. So does the engine decide to

1.) stop sending fuel completely untill the revs are low enough that without fuel the engine will stall ( When the rpms have dropped below 1.5k or so )

2.) Keep inputting and com-busting the amount of fuel equivalent as to the amount used while the engine is idling even though the engine will not stall because the rotation of the wheels is still keeping the crankshaft going.

Note= Note this question only applies to a engine with a ECU controlled EFi system.

[Xulfiqar]

Question.

Topic = general engine function.

I have a suzuki swift DX.

Scenario=
Driving along a large empty road at 80 kmph , with a left turn about 300m ahead.

Rolling start

car is in 5th gear, going at 80kmph.

driver applies brakes, car slows to 60kmph. Brakes are released.
clutch is engaged, driver switches to 3rd gear and revs up the engine to 6k rpm and then disengages clutch. Gear change is successful and there is no jerking etc. ( rev-matching )

The car starts to turn, and the brakes are not applied. accelerator is not applied from here on forward.

the car slows down via engine braking during the turn and midway the brakes are slightly used to fine tune the speed/deceleration .( engine braking )

While the car is slowing down via engine braking, is there any fuel input to the engine? Is the engine burning any fuel? the movement of the wheels themselves is enough to keep the engine revolving, so hence is there any more fuel being shot into the cylinders?

if the engine is on overrun above fast idle speed, and movement being registered from the vehicle speed sensor, the fuel will be cut off uptil the time the ECU sees the engine is about to balk out.

[Marschall]

Update So i came back and started the merc after 2 weeks and took it to mighty Papu Ustaad, we ran the star diagnostic and the top most error was "Cylinder 5 misfire" rest we had ASR,BAS and transmission module fault.Anyways he diagnosed them and then we had none.Now he advised me not to change the conductor plate as it is not required he just told me to get the transmission oil changed.After the removal of these errors i have felt a difference.
1.Gear shifts are smooth as all gears are shifting around 2100-2200 rpm which i know is not right that is why when i am driving in my lane very slowly as soon as the rpm reaches around 2200 it shifts to 2nd with a slight jerk.
2.Vibrations SOMETIMES come during startup i switch off then start again and they are gone.Also if i get these vibrations during startup they go after 5 sec or so.
Whats your analysis faulty coils or sparkplugs???

[hassaaniqbal92]

Salaam fellow pakwheelers. My mehran's oil and air filter change was due today. i went to my mechanic, he started draining the old oil. In the meantime I removed the air filter housing to replace the air filter inside. After replacing the air filter and pouring the oil, I started the engine and turned on the ac. I noticed that the car's rpm had dropped on idle engine with the ac turned on. When I switched off the ac, the rpm was restored to normal. Then again when I had turned on the ac, the rpm level dropped again. The vacuum tubes were properly connected. I thought that maybe something was stuck, so i started loosening the bolt of the air filter housing and surprisingly, the rpm started increasing as i loosened the bolts. I switched the ac off, and the rpm was restored again. Finally, I had noticed that the loosening or tightening of the air filter housing bolt had no impact on the rpm of the idle engine without ac, but with the ac switched on the rpm drops if i keep tightening the bolt and it rises if I start loosening the bolt.
Please help asap in this regard. My car is a carburetor mehran 1996 on petrol only.

[DUDE007]

Which oil and oil filter were used now and before this one? Have you checked oil level from dip stick?

Do air filter pipes have any blockage?
Enviado desde mi GT-I9500 usando Tapatalk

[zwk641]

Xulfiqar Bhai. should hybrid cars get oil sprayed on downside from service station.
I hear sometimes sound while crossing bump, Mechanic says get your car Oil sprayed from downside. Pls. advice how can I get Shocks/Speings/Suspension lubricated.

[arsalankhan321]

Xulfiqar Bhai. should hybrid cars get oil sprayed on downside from service station.
I hear sometimes sound while crossing bump, Mechanic says get your car Oil sprayed from downside. Pls. advice how can I get Shocks/Speings/Suspension lubricated.

Never ever spray oil underside.first of all completely diagnose about the sound you hear.And also wait for @xulfiqar suggestion.