Ask Xulfiqar - An Automotive Encyclopedia

[iamadee]

@Xulfiqar

As salaam O Allikum

I have a 05 Toyota SE Saloon (1.6ltr 3zzfe) some 125K driven. CNG was there but i have had it removed for over an year now. My problem is that i can smell raw fuel or unburnt fuel smell from the exhaust. The mileage im getting is pretty low as well.
What I Have done....
1. Complete Tuning (Including Scantool, no MIL BTW)
2. Throttle body service
3. Compression Test
4. New Plugs
5. Injector Service ASNU Tech
6. Checking AFR with Exhaust Analyser ( Final AFR reading was 17, that too after a lot of hit and trials, couldn't get any better then that)

Problems
1. The smell i have mentioned in the begining
2. After all this tuning im facing another issue which was not there earlier that the car accelerates fine when starting from stop, but takes a jerk when i repress gas at slow speed. This issue appears only on cold engine. As soon as the engine temperature reaches its optimal level the problem fades away...

Looking forward for your earliest response......

[Xulfiqar]

Started the vehicle after 1 week got heavy vertical vibrations went to the workshop and imed got the engine mounts changed unfortunately he only had febi mounts for my m112 merc i wanted lemforder ones but for that i had to wait,khair i changed the mounts alongwith the gear mount and fuel filter checked the serpentine belt as well.Now the issue is that i get a slight nudge on idle a very low rhythmic vibration.Mechanic says i have weak plugs on one side i think its the 6th cylinder.Dont know whether to go for a sparkplug change cuz i had them replaced 50k back genuine bosch

if you get a rythmic yank yank type vibration and smooth engine with no oddball light miss in the exhaust - specially on cold start then its most probably the torque converter clutch is dragging due to wear and tear. You will also feel this vibration when put in gear when cold. You wont feel this when the ATF is hot. When this problem gets really ugly in extreme cold the engine stalls when put in gear because the torque converter clutch is applied and stuck on locked. There is a remedy for this but those torque converters are only sold in USA, a local US company made a fix for this issue, and the result is absolutely brilliant.

If the spark plugs were to go bad on the M112 engine and cause a misfire, The ECU will immediately shut down the specific cylinder fuel and spark both - this is done to save the catalytic converter of the respective bank.

[Xulfiqar]

The left dabba a guy imported from abroad the right one is what is available locally whts the diff?

The right one is ATF 134 - which is the 7 speed ATF, the one on the left is not, can you read the part no. on the packaging - it must say what oil spec it is.

[Xulfiqar]

Febi mounts

Febi itself does not manufacture anything, they are reboxers of parts, what brand was stamped on the part itself. I have seen a variety of different parts in a febi box.

[Xulfiqar]

@Xulfiqar

hello plz if u see this can u guide me

vehicle is 78 corolla rwd

i wrote in ur thread also havving problem transmission fluid leak and right rear wheel is locking up (its not rotating! gets stuck then moves on its own will then stuck again!)

mech told me

replace speedometer garari seal

replace rear axel seals

please reply back with any other checks to be done/any other recommendation.

u also said before differential can become dangerous "check the pinion position on the crown wheel." WHat exactly is being checked. whats it called in Urdu? and how do I know its done correctly. every person can say its done perfect how do I know? I hope you can reply some method, other than take it to reliable person, because reliable mechanics have made mistakes causing the issues

any good mechanic recommendation for lhr

replacing the speedo drive seal is easy - wont cause any issues.

replacing the rear wheel seals is easy and does not cause issue - check the diff axle bearings when you remove the axle shafts to change the seals - leaking oil will make the rear brakes jam.

IF for any case the input seal to the diff is leaking and you are to replace it, that is very delicate business as it can change the position on of the pinion on the crown wheel which then can cause extremely fast and rapid wear on the diff.

please read THIS page thoroughly - it gives you an idea what a diffy is and how critical it is to adjust it correctly, Its not to be done without experience. - If just the side axles are being worked on - then it doesnt matter, its just a matter of removing the axles from the tube.

[Xulfiqar]

@Xulfiqar

As salaam O Allikum

I have a 05 Toyota SE Saloon (1.6ltr 3zzfe) some 125K driven. CNG was there but i have had it removed for over an year now. My problem is that i can smell raw fuel or unburnt fuel smell from the exhaust. The mileage im getting is pretty low as well.
What I Have done....
1. Complete Tuning (Including Scantool, no MIL BTW)
2. Throttle body service
3. Compression Test
4. New Plugs
5. Injector Service ASNU Tech
6. Checking AFR with Exhaust Analyser ( Final AFR reading was 17, that too after a lot of hit and trials, couldn't get any better then that)

Problems
1. The smell i have mentioned in the begining
2. After all this tuning im facing another issue which was not there earlier that the car accelerates fine when starting from stop, but takes a jerk when i repress gas at slow speed. This issue appears only on cold engine. As soon as the engine temperature reaches its optimal level the problem fades away...

Looking forward for your earliest response......

has someone messed with the mixture adjustment which is bolted to the airbox? - AFR 17?? - is this the stoich measurement? or in some other unit?

when the injectors were cleaned - did you get a paper which shows test results? like leakage test, spray pattern, volume etc.

Reason to ask this is because if it was not done then such situation may call for an injector balance test to be carried out.

Please be reminded that cleaning injectors too much does destroy them.

[iamadee]

has someone messed with the mixture adjustment which is bolted to the airbox? - AFR 17?? - is this the stoich measurement? or in some other unit?

when the injectors were cleaned - did you get a paper which shows test results? like leakage test, spray pattern, volume etc.

Reason to ask this is because if it was not done then such situation may call for an injector balance test to be carried out.

Please be reminded that cleaning injectors too much does destroy them.

The AFR data was collected by a device exhaust analyzer from which a pipe went into the exhaust of the vehicle.

As per injectors cleaning I have had it done for the first time. I didn't get a paper of the readings but I saw its pattern while on the machine and all injectors spray pattern was fine. The machine did a leak test too, which was passed. The volume on all of them was also fine as the tubes filled almost the same amount in all four lines. There was although a minute difference in readings but the guy said its OK if it within 3 cc or whatever the unit it displayed.
Please tell more about the mixture you have mentioned bolted on air cleaner box. No mingling done to it BTW.

[Marschall]

if you get a rythmic yank yank type vibration and smooth engine with no oddball light miss in the exhaust - specially on cold start then its most probably the torque converter clutch is dragging due to wear and tear. You will also feel this vibration when put in gear when cold. You wont feel this when the ATF is hot. When this problem gets really ugly in extreme cold the engine stalls when put in gear because the torque converter clutch is applied and stuck on locked. There is a remedy for this but those torque converters are only sold in USA, a local US company made a fix for this issue, and the result is absolutely brilliant.

If the spark plugs were to go bad on the M112 engine and cause a misfire, The ECU will immediately shut down the specific cylinder fuel and spark both - this is done to save the catalytic converter of the respective bank.

What do u recommend then?? its a slight nudge after about 2 sec very low tone sort of a bump only the driver can feel it.Also which atf do u recommend for the 722.6 gearbox

[Xulfiqar]

What do u recommend then?? its a slight nudge after about 2 sec very low tone sort of a bump only the driver can feel it.Also which atf do u recommend for the 722.6 gearbox

is the exhaust smooth? or does it puff when this pulse happens? Any leaks on the breather caps or its pipes, what do the fuel trims look like?

722.6 gearbox factory fill is Shell M3403M115 ATF which is the only ATF mentioned in the 236.10 sheet of MB

it can also take shell or fuchs 3343 ATF which is 236.12 spec and also 3143 ATF which is the ATF for 722.9 - but is back compatible with all gearboxes.

The cheapest out of the bunch is the ATF 134 - shell sells it cheapest but being Pakistan corporate culture where everyone is confused and out to impress gora sb only, you wont be able to find it.

the only other choice is to buy the same ATF in a mercedes container - which jacks up the price exponentially.

You can also choose to use the LM ATF that is specced for a bunch of other cars - it will work perfectly ok too. - Make sure to reset the adaptations when you change the ATF.

[Line2nature]

Xulfiqar bhai i need a help here,
i have to replace spark plugs of my vitz 2009,
i wannt to know that how much tight should i do the newly palced plugs?
i dont have any torque wrench,
thanks in advance,

[Marschall]

is the exhaust smooth? or does it puff when this pulse happens? Any leaks on the breather caps or its pipes, what do the fuel trims look like?

722.6 gearbox factory fill is Shell M3403M115 ATF which is the only ATF mentioned in the 236.10 sheet of MB

it can also take shell or fuchs 3343 ATF which is 236.12 spec and also 3143 ATF which is the ATF for 722.9 - but is back compatible with all gearboxes.

The cheapest out of the bunch is the ATF 134 - shell sells it cheapest but being Pakistan corporate culture where everyone is confused and out to impress gora sb only, you wont be able to find it.

the only other choice is to buy the same ATF in a mercedes container - which jacks up the price exponentially.

You can also choose to use the LM ATF that is specced for a bunch of other cars - it will work perfectly ok too. - Make sure to reset the adaptations when you change the ATF.

Exhaust is smooth no puffs no smoke no leaks ......didnt get what u meant by fuel trim??

[searchingeyez]

Exhaust is smooth no puffs no smoke no leaks ......didnt get what u meant by fuel trim??

same issue of fuel i feel exhaust smell in garage when idle for 1 minute or two mileage is very poor...
@xulfiqar what do you guess when exhaust become hotter on idle screw adjustment ..... is there any relation of combustion to exhaust pattern . do you have any exhaust inspection without equipment i mean by using senses

[accord786]

@xulfiqar

Salaam

Please could you suggest which fuel Honda Accord 2.4l CL9 should be run on

Should it be run on Unleaded, Hi-Octane or a Mixture of the two?

Thanks for your help in advance

[Xulfiqar]

Exhaust is smooth no puffs no smoke no leaks ......didnt get what u meant by fuel trim??

fuel trim are the learned and immediate values that the ECU uses to adjust fuelling. aka long term fuel trim and short term fuel trim - the long term is learned over time and is used to adjust fuelling (it compensates for worn parts like MAF or O2 sensors)

the short term is immediate and changes at every start - the long term is stored in keep alive memory.

In my experience - MB 112 use a very sensitive MAF and it does wear out in about 125,000 kms - replacing it with a pattern part is not a good idea, only a replacement MB item or exact item from pierburg or Bosch works - they are not cheap. Same with the o2 sensors, they go weak and lazy after 125,000 kms. (shorter if they are poisoned)

If your fuel trims show a consistent addition of fuel at nearly all rpm range, your MAF is highly suspect, test the O2 sensor too.

the trims can be checked with SDS, autologic or even any good scan tool like a launch X431 etc. My little handy bluetooth can check them too.

[ziyad.ahmad.391]

@xulfiqar bhai..Sir im an owner of an 8th gen prosmatic..From last few days im noticing increased engine sound inside cabin and also vibration in the steering wheel and whole cabin when the car is reved and kept at 1000rpm even while standing in the garage.There isnt any vibration at idle..it smoothes a bit after raising rpms..The drivers side mount was changed a while ago from honda as a recall..the other mounts are still oem..car has 94k on the odo..plugs replaced wid oem and injectors cleaned and throttle body cleaned from honda..Also the engine seems to have vibrations when i put my hand on the valve cover i mean its not smooth..Can u please guide me how to make this problem go away and how to smoothen up this engine and make its noise less noticeable in the cabin..

[ziyad.ahmad.391]

Fuel trims are a constant -11 or -12 in the long term and idling..short term fuel trim changes when the car is driven varies from -6 to -8 on parth throttle but comes back to -14 at idle!

[Xulfiqar]

your engine mountings are bad - check all of them.

and why the love for "thrattal baady cleaning"??

no 4 cyl engine is smooth, the firing pulses are too far apart.

[iamadee]

[quote name="Xulfiqar" post=4940219]has someone messed with the mixture adjustment which is bolted to the airbox? - AFR 17?? - is this the stoich measurement? or in some other unit?<br />
<br />
when the injectors were cleaned - did you get a paper which shows test results? like leakage test, spray pattern, volume etc.<br />
<br />
Reason to ask this is because if it was not done then such situation may call for an injector balance test to be carried out.<br />
<br />
Please be reminded that cleaning injectors too much does destroy them.[/QUOTE]<br />
The AFR data was collected by a device exhaust analyzer from which a pipe went into the exhaust of the vehicle. <br />
<br />
As per injectors cleaning I have had it done for the first time. I didn't get a paper of the readings but I saw its pattern while on the machine and all injectors spray pattern was fine. The machine did a leak test too, which was passed. The volume on all of them was also fine as the tubes filled almost the same amount in all four . There was although a minute difference in readings but the guy said its OK if it within 3 cc or whatever the unit it displayed.<br />
Please tell more about the mixture you have mentioned bolted on air cleaner box. No mingling done to it BTW.

[iamadee]

Please look into the info provided and advice accordingly.

[Xulfiqar]

Fuel trims are a constant -11 or -12 in the long term and idling..short term fuel trim changes when the car is driven varies from -6 to -8 on parth throttle but comes back to -14 at idle!

short term to be -14% at idle means that the engine is seeing too much fuel being used, Do you have access to someone with smart brains and good tools?