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Author Topic: Help ! Issues after belt change  (Read 14853 times)
aaronritchie
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« on: November 13, 2014, 01:15:17 AM »

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).
« Last Edit: November 13, 2014, 06:26:50 AM by aaronritchie » Logged
ddillenger
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« Reply #1 on: November 13, 2014, 02:53:26 AM »

Have you checked measuring block 093?
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aaronritchie
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« Reply #2 on: November 13, 2014, 03:12:07 AM »

Have you checked measuring block 093?

No i have not. Whats on block 093 ?    Thanks
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ddillenger
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« Reply #3 on: November 13, 2014, 03:19:12 AM »

Check it, post results. It's camshaft/crankshaft correlation.
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aaronritchie
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« Reply #4 on: November 13, 2014, 03:38:51 AM »

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

ok i see what block 093 is for . Ok i will check it and post up results. Thanks

Could it be a lazy or old pre cat lambda ? There is a lambda test or age block i think.
« Last Edit: November 13, 2014, 05:41:15 AM by aaronritchie » Logged
fknbrkn
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« Reply #5 on: November 13, 2014, 06:29:28 AM »

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

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
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aaronritchie
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« Reply #6 on: November 13, 2014, 06:54:49 AM »

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
« Last Edit: November 13, 2014, 12:05:12 PM by aaronritchie » Logged
hopsis
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« Reply #7 on: November 13, 2014, 12:44:33 PM »

Do You know if whoever did the belt job used the correct tools? Half a tooth off will produce the results You are seeing.
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10101011
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« Reply #8 on: November 13, 2014, 12:53:24 PM »

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
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
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ddillenger
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« Reply #9 on: November 13, 2014, 02:17:05 PM »

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.
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10101011
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« Reply #10 on: November 13, 2014, 03:34:28 PM »

One tooth is usually closer to 20 in my experience.


There are 52 teeth on the cam gear..... follow me on this one  Tongue 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.  Wink I hope this helps you.

Lee
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ddillenger
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« Reply #11 on: November 13, 2014, 03:59:16 PM »


There are 52 teeth on the cam gear..... follow me on this one  Tongue 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.  Wink I hope this helps you.

Lee

Your math is good Smiley

There was some discussion about that reading not being degrees however.
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vwaudiguy
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« Reply #12 on: November 13, 2014, 04:42:42 PM »

 Smiley
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fknbrkn
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« Reply #13 on: November 13, 2014, 06:55:14 PM »

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.
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aaronritchie
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« Reply #14 on: November 14, 2014, 12:57:38 AM »

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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« Last Edit: November 14, 2014, 01:01:28 AM by aaronritchie » Logged
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