Vanos Rebuild Start Hesitation

[sapote]

Only because of the Y axis scale, the actual values are the same.

Not the same: expected should be 12 degrees for some time but actually only get to 3 degrees

[jamesfoley]

Not the same: expected should be 12 degrees for some time but actually only get to 3 degrees

Not sure I understand what you mean. I was just saying that the exhaust actual and expected deviation is the same both cold and warm start.

Do you mean the exhaust cam expected should hold 12 degrees for longer than it does?

Is it possible to cross reference these values with a table from the MSS54 XDF?

I've tried checking the partial I pulled from my DME using TunerPro and the 1301 XDF, though a lot of the data is just jumbled so assumed there is something up with the 1301 XDF

[sapote]

Not sure I understand what you mean. I was just saying that the exhaust actual and expected deviation is the same both cold and warm start.

Do you mean the exhaust cam expected should hold 12 degrees for longer than it does?

Is

On the graph you posted I see the cold start ex cam issue as I posted earlier: expected 15 degrees but actual is only 3, for a short duration but enough to be different than warm starting.

[jamesfoley]

On the graph you posted I see the cold start ex cam issue as I posted earlier: expected 15 degrees but actual is only 3, for a short duration but enough to be different than warm starting.

Both cold and warm start seem to be around the same, if you look at the Google Sheets spreadsheet of the values from that graph pretty sure line 8467 is where the engine is turned off with actual being set to 0 but expected being set to -10. Then line 9268 is warm start where actual is now -4.2 and expected is 9.5. Cold start has an actual of -1 and an expected of 12, you can see from my other cold start logs further up that I've also has -5 actual, 11 expected.

The numbers feel weird but can't tell if its normal or not. I figured there would have been a VANOS tables somewhere in the DME.

[jamesfoley]

It has been a while, car still has its quirky start now and then, but it has never failed to start, and once started it runs and drives without an issue.

However every now and then the car throws codes even though there is no fault present. The main concern is “10 [015] Signal, cranksheft sensor” that keeps popping up on the DME as a shadow code.

Is the car trying to tell me there is actually something wrong with the crankshaft sensor / crankshaft signal wire, or is it possible for these to just appear and disappear at random?

Think I’ve mentioned this code before, and I have had the sensor swapped. Would be good just to understand if there is a problem there or not.

[BL92]

Someone on E46 Fanatics was having starting issues
He changed the ICV and it was all sorted

[jamesfoley]

Someone on E46 Fanatics was having starting issues
He changed the ICV and it was all sorted

As far as I know the ICV is good. I did pull it out and clean it which made it move more freely. I'm not having any other drivability issues either, I know the car uses the ICV for low engine load intake which I would have thought would be jerky and horrible if the ICV was dead. Only time the car is kinda jerky is when the secondary air pump is active and engine cold, but have been told this is normal.

Only other thing I did want to note, and it sounds kind of stupid and unrelated, but when the car has its weird start, the steering wheel controls (volume and skip track) stop working. I have an aftermarket radio, so it might just be the canbus decoder thats getting upset, but did also think what if the canbus box is throwing junk down the k-line bus making other things upset? I don't actually know if there is anything vital to the car starting on k-line though, pretty sure it was just all entertainment / interior stuff.

[BL92]

My Money is on ICV, See if you can borrow one to try before you buy
Also check the return line to sump is connected under the air box ( can mess up fuel trims )
Check your PCV isn't blocked, and crossover hose isn't cracked

By the way have you logged your AFRs? Windband gauges are a must for trouble shooting