Ask Xulfiqar - An Automotive Encyclopedia

[Xulfiqar]

[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?

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 . 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.[/QUOTE]

do you have access to a toyota techstream or similar scan tool? and someone qualified to work on it, if Im assuming the AFR was 17:1 - that means the system is running ultra lean - which is exactly opposite of excessive fuel consumption.

I can point you to a place in Lahore if you are interested

[ziyad.ahmad.391]

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?

I only have access to mechanics at honda 3s..which claim 'haigh aactane' to be the solution to all the mechanical and technical problems in any car..they im sure dont knw anything about fuel trims as well!

[ziyad.ahmad.391]

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.

One engine mount is located at the bottom of the car known as the torque rod? Culd that be causing all this? @xulfiqar

[Xulfiqar]

I only have access to mechanics at honda 3s..which claim 'haigh aactane' to be the solution to all the mechanical and technical problems in any car..they im sure dont knw anything about fuel trims as well!

I would like to use gaaliyan on such dealerships. the fuel trims are used as diagnosis tools all over the world. - find better mechanics - the ones you are visiting are morons.

A car showing -14% at idle is a red flag for any smart technician that the engine is not seeing correct fuel mixture.

[overspeed111]

bro my daewoo racer runs fine do i still need to get it checked on scanner? which one works with it, althrouh it had bad TPS on some point of the throttle the TPS stops working and CEL comes on and when i release throttle the CEL goes off, but im guessing which sensor it could be?
when a O2 sensor should be changed? any indications of bad o2?
nowadays rpm falls back very slowly as i release the throttle.

[Marschall]

Got it!!!! will get it diagnosed btw i did get the MAF changed to oem spec but yes o2 i didnt change currently mileage is 120k

[ahmed2396]

This one heck of car of its time 1971 i doubt any single car in Pakistan. @xulfiqar

[mir.azam]

@xulfiqar can Crank bearings be replaced without taking of the engine, i mean just by accessing via oil pan side ?
Issue whining noise low oil pressure. Engine Honda D15

[Xulfiqar]

This one heck of car of its time 1971 i doubt any single car in Pakistan. @Xulfiqar

Only saw one or two skylines, but Pakistan had a lot of bluebirds. I have a picture somewhere where my eldest uncle had one.

[Xulfiqar]

@Xulfiqar can Crank bearings be replaced without taking of the engine, i mean just by accessing via oil pan side ?
Issue whining noise low oil pressure. Engine Honda D15

it can be done - but never do that as you need to measure the clearance and also make sure the journals are not ovalled out.

[iamadee]

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 . 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.

do you have access to a toyota techstream or similar scan tool? and someone qualified to work on it, if Im assuming the AFR was 17:1 - that means the system is running ultra lean - which is exactly opposite of excessive fuel consumption.

I can point you to a place in Lahore if you are interested[/QUOTE]

Sure. That would be great.

[Maverickiz3d]

This is from Mercedes Sprinter. Please explain what "A" is for; and can we call this Tiptronic?

[mypakistan]

I have a spongy breaks pedal and there is no leaks or break fluid losing in bottle, I changed master cylinder, front brake pads, rear cylinder seals and rear soft line. When we pry the boot of rear cylinder there is a brake fluid coming out, after changing the rear seals my mechanic bleed system properly. Spongy Breaks occur when I drive for 3 to 4 hour constantly then slowly after few days the breaks get spongy, after that I go to my mechanic and he bleed trapped air form rear one wheel only and then the breaks going fine. As last option my mechanic advice to change the both rear cylinders, Pl advice.

[Xulfiqar]

Sure. That would be great.

contact @syncview for details.

[Xulfiqar]

This is from Mercedes Sprinter. Please explain what "A" is for; and can we call this Tiptronic?

A = automatic

the rest is manual shift (aka tiptronic, manual select, hold - whichever term you like best)

[Maverickiz3d]

A = automatic

the rest is manual shift (aka tiptronic, manual select, hold - whichever term you like best)

Oh so basically A = D.

Thanks for the info.

[Xulfiqar]

I have a spongy breaks pedal and there is no leaks or break fluid losing in bottle, I changed master cylinder, front brake pads, rear cylinder seals and rear soft line. When we pry the boot of rear cylinder there is a brake fluid coming out, after changing the rear seals my mechanic bleed system properly. Spongy Breaks occur when I drive for 3 to 4 hour constantly then slowly after few days the breaks get spongy, after that I go to my mechanic and he bleed trapped air form rear one wheel only and then the breaks going fine. As last option my mechanic advice to change the both rear cylinders, Pl advice.

if you see liquid under the boots of the rear slave cylinder - its leaking and requires replacement.

[ahmed2396]

@xulfiqar E55 AMG W210 MAF again gone. MAF is really cheap on these mercs, heck man on toyota's it was still solid after 250k kms.

[Xulfiqar]

@Xulfiqar E55 AMG W210 MAF again gone. MAF is really cheap on these mercs, heck man on toyota's it was still solid after 250k kms.

genuine or aftermarket MAF?

toyota use dheet MAF and the biggest factor of it not failing is that the ECU does not give a damn about a few units here and there on some input parameter.

[ahmed2396]

genuine or aftermarket MAF?

toyota use dheet MAF and the biggest factor of it not failing is that the ECU does not give a damn about a few units here and there on some input parameter.

Genuine MB MAF, replaced 40k kms ago.