NefMoto

1.8T 20V seat ibiza fr stock egine with gt28rs turbocharger, siemens deka 630cc and 80mm maf.
Program: lamda requests 11.4 AFR and 12^o ignition timing.
I think something is wrong with the engine...
Wot box is removed and cables are soldered together. 3 old ignition coils one new beru at 2nd cylinder.
New spark plugs.

Up looking for opinions  :)

vcds logs? no other logger works on your car?

Yes those are vcds logs. What logger you d like to use? thats not a problem and not my car  :)

A new log the problem looks more clear. I mean can the car works with 3 degrees ignition?
Your opinion is very welcome  :)

use me7 logger naturally and log a standard set of variables. VCDS logs tell us exactly nothing except that the car is cutting RPMs like crazy?

New ME7logger logs are attached.
3rd 4th & 5th gears.
Please your opinions.

edit: Just came home and look more closely the logs.
On those logs the problem look to be on 3rd cylinder.
[ .ecu file was reviewed again and fzabg_w pointers { fzabg_w_0       , {CountMisfireCyl1}, fzabg_w_2   {CountMisfireCyl2},  fzabg_w_3       , {CountMisfireCyl3},  fzabg_w_1       , {CountMisfireCyl4} } are ok on cfg file {
dwkrz_0         IgnitionRetardCyl1       
dwkrz_2         IgnitionRetardCyl2             
dwkrz_3         IgnitionRetardCyl3             
dwkrz_1         IgnitionRetardCyl4             
fzabg_w_0       MisfireCyl1                     
fzabg_w_2       MisfireCyl2                     
fzabg_w_3       MisfireCyl3                     
fzabg_w_1       MisfireCyl4     } ].

VCDS logs are pointing cylinder 2. Cant understand! (perhaps the programs maps differently cylinder's position?)

12 degrees at what rpm?
it does not move with the rpm?
the log shows way to late ignition in the upper revs.

KFZW at 180% engine load or more:
10.50 @ 4000
10.50 @ 4520
11.25 @ 5000
11.25 @ 5520
12.00 @ 6000
13.50 @ 6520 and upper

KFZW2 is 2 degrees more at same rpms.

Know that there is a late ignition problem but why? Cylinder 3 knock voltage is too high. Probably that cause the ignition drop but why?
Spark plug? Changed, same behavior.
Ignition coil? Just changed haven't measured it yet.
Knock sensor? Values of knock sensors are defaults, never touched.

Forgot to mention that DTCs were stored after log for:
Knock sensor G61 signal too high
Oxygen sensor B1 S1 something wrong dont remember it
N249 malfunction.

log knock voltage at idle etc. From the looks of it though the sensor is reading too high for that cylinder. Do you have one or two sensors? What car is that? If you have only one sensor and it is reading high on one cylinder... you might have mechanical problems with cylinder slap hence the knock-like readouts on it.

Two knock sensors. First, G61, is for cylinders 1 & 2, second ,G66, is for cylinders 3 & 4.
Seat ibiza MK4 1.8T 20V.

Meaning the piston moves side to side? Compression ratio is almost the same to all cylinders. No oil or water burn.
Also any explanation why VCDS reveals retards on cylinder 2 and me7logger on cylinder 3?

I have some idle logs attached.

it is a matter of labeling, the cylinder #.

Move injectors around, lazy injector will cause less fuel coming to its cylinder and increase knock due to leaner AFRs.

I ll do it and post.

But injectors were measured and were ok before 1000-1500km.

So on which cylinder is the problem located? 2 or 3 ?

ME7 might list cylinder firing order while VCDS usually shows cylinder order in the block. You'll have to find out mapping for your engine yourself.

I did injectors repositioning and new log attached.
All logs and those logs are with NLS funtion.

Wrong log's format reattached.

Up and good morning looking for some opinions  :)

Compression ratio was measured again and problem revealed:
1st cylinder 11.8
2nd cylinder 9.8
3rd cylinder 11.2
4th cylinder 11.4

After feed cylinder 2 with oil, compression, measured again and reached 15. Cant be sure for the reason of the problem, but car doesn't burn oil or water so i guess should be a valve (probably exhaust one) problem.
Any thoughts?

leak down test next then to try and determin where from..
cyl head off tho sound inevitable

No leaks, vacuum system and ic were tested in every detail.
I ll check the bolts of the cyl head to see if all are tighten evenly.
More when done this.

A leakdown test has absolutely nothing to do with your intake and IC.
Also, you got it the wrong way around. If you add oil and the Compression goes up, then it's usually the rings/bores.

Correct, but we add much oil, 10-15ml so whenever the problem is wasn't revealed that way.
Now compression is ok, after using brand name engine cleaner, 11.8, 11.3, 11.6, 11.5 but knock volts on 2nd cyl are too much. More than 65V, varied from 40V to 72V, at WOT no matter pressure level (1bar, 1.7bar).

So problem is now solved.

The root of the problem was loosen exhaust valve guides and 6 (a bit) bended exhaust valves too. Also intake valves had some deposits on its edges.

After machinery car works now very good.

Cheers.

thankyou for confirming and letting us know