NefMoto

Car was running great until i had new timing belt kit fitted. May just be coincedence , but here is the story.   I have torque running and noticed car felt less responsive and heavier on fuel so did log.  on previous logs timing pull was no more than 6 after 5800 rpm and maf reading was approx 205g/s at 6100 rpm.  My trims were normally -0.8 and -3.9 . Now trims are are both at zero (havent reset them) . Now its pulling up to 9 degrees timing from 5.5k and the corrected load seems to be being pulled too . Now peak airflow is about 191g/s . Have done leak test and no leaks . My two ideas on cause would be a failing maf (a brand new oem one fitted about 16 months ago) or the timing is out after belt change.  I have attached the log i took after belt change. Any pointers would be a great help. Thanks . Oh boost requested is 1.2 bar on map.  No fault codes. I also put stock map on and trims are the same after two days or running (they would normally be 0.8 and -3.1).

Have you checked measuring block 093?

Check it, post results. It's camshaft/crankshaft correlation.

Could it be a lazy or old pre cat lambda ? There is a lambda test or age block i think.

can you explain how its may affect on timing? i have -7 KW in 93. should i bother about this? timing chain was replaced a week ago (with faulty ex hydrolifts), timing belt marks on crank and cam seems ok.. no changes. vvt unit was changed a year ago with the timing belt

as far as i know its how far your cam and crankshaft are out in degrees between each other.  The max tolerence from autodata is  +/- 4

ok can rule out both lambda as they passed vcds tests along with cat

Do You know if whoever did the belt job used the correct tools? Half a tooth off will produce the results You are seeing.

Did I miss something ??  what engine is it ?? 1.8t,2.7t, ?

The belt was incorrectly done..... .  on a 2.7T You need both banks ( left & right ) corralation readings as the crank sensor adaption reading.  On a 1.8T 7kw is way too much for a tuned engine ... Just have the belt redone.The belt is off by one tooth..

Lee

One tooth is usually closer to 20 in my experience.

There are 52 teeth on the cam gear..... follow me on this one  :P 360 deg/52 teeth=6.92 degrees between teeth. The computer reads that as 7 deg. Being a mechanic for 20+ years ... I know this stuff like the back of my hand. I have seen this countless times in my shop.  ;) I hope this helps you.

Lee

Your math is good :)

There was some discussion about that reading not being degrees however.

 :)

i did this job. engine is 1.8t
crank mark and cam mark are matched. after releasing tensioner i made some crank turns and recheck marks, they was ok.

I have carried out all lambda test/cat test and all pass ok . Took another log to check injector time and max is 18ms so its not a weak pump or filter . My bet is MAF as the log recorded max of 180gs . Boost matched requested at 1.2 bar .

MINE IS A 1.8T BAM . So the reading mine gets is acceptable at -2 ?  
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MVB 32 will tell you the fuel adaptations.  The readings should not be over +- 10%. A perfect unexpected and good running engine will be +-5 %.  MVB 32 will tell you if the maf is junk or another problem with the fuel / intake system

Hint of the day :

You cant be in basic settings when checking the corralation on the camshaft. You need to be in MVB for all live data reading. Basic settings will stop all adjustments or cause a test to happen when you are doing logs.

Lee

Normaly you have to drive the car for 10 - 20 minutes for the fuel adaptaions to start and the N75 to adapt as well ( MVB 111 ). I would drive the car for 10-15 miles on the highway. For the fuel adaptations to start the engine coolant has to be above 165deg and be running longer than 4 minutes. When driving you should not give it full throttle.You can give 90% throttle though. Full throttle will stop the fuel adaptations.

Lee 

Have you tried a throttle adaptation

sweet i was just about to post that the vacuum would be all messed up great news :) thats easy

LOL at all teh quote fails lately.

Seems to be a contagious illness going around.