FIXED! 06 Nissan Altima 2.5L Cold Start Random No Coil/Injector Control

Very well put Juergen. Thank you

juergen.scholl wrote: Graywave,

i am glad seeing you making progress not only in this case...

The art of diagnostics in which u are so interested is a learnable skill. In most of the cases it includes thinking "inside " the box.... In many cases it really comes down to observe, gather data and analyze it.

As a diagnostician you must learn to see or sense whatever data is given to you, no matter if scanner, scope, test light, ears, nose etc.
Once you recognize the data as what it is - raw data - you can analyze and relate it to more data and start to enter the diagnostic part of the game. But before you really have to "SEE WHAT YOU'RE SEEING". Once again, this means to recognize the collected data as what it is and as what it can tell you.

Another very important part, especially with scope and scan diagnostics, is don't let become experience become to hinder you in the diagnostic process: EVERY car is a different car, EVERY problem is a NEW problem. Use your experience, don't let it mislead you.

Took some pictures in the early stages. Looking like a loose chain to me. Tensioner seems fully extended. Tomorrow I"ll finish the job. I have to check on AllData / Mitchel to see exactly what marks on the crank shaft to look at but the "dot" on the crank shaft doesn't seem to line up 100% with the orange link. Almost looks one tooth off. Didn't have a picture of that.

In case anyone in the future is looking to do this. Eric the Car Guy has great two part video replacing the timing chain on this exact engine in a sentra.

Part 1


Part 2

Holy crap, that tensioner is WAY extended. :ohmy: For fun and games, compare the chain to the new one when you get it apart. The old one will probably be a foot longer. :lol:

EDIT: Also, is that the Fixing it Forward Sentra with the famous welded control arm/ball joint? :silly:

It is the Fixing it forward sentra but I had no clue about the welded control arm ball joint haha. I need to find that hahaha

That top timing cover is fairly easy to get too as well. I wanted to take that off a long time ago but as always, I'm at the mercy of the big boss calling the shots telling me it was not a timing chain problem. I would have found the tension issue long time ago.

I will certainly make a side by side comparison of the chains!

Thanks for the update and yes, the tensioner looks quite extended...

Big Difference.


Comparisons.

!!CONFIRMED FIX!!
TIMING CHAIN and COMPONENTS

CONFIRMED ISSUE
WARN TIMING CHAIN and GEARS (EXCESSIVE SLACK)

INT/V TIM DEG PID is now 0 to -3 (Verse -24 to -36)
No Loss of Coil or Injector Control
Cam and Crank Correlation Waveform looks great

Could someone change the title to [FIXED] please? I can't seem to edit my original post and change the title.

Nice work, thanks for keeping the post up to date for us.
Gotcha on the fixed label.

Glad to see this one taken care of. Way to stick with it.

Sent from my Moto G Play using Tapatalk

Your welcome guys and THANK YOU. I'm sure I'll come across another odd job again. I appreciate all the tips and suggestions all of you put up.

Hopefully this will help others in the future.

Thanks for fixing the title Noah!

I am just curious, did you replace the variable timing phaser on the left side as well?

No I left that alone along with the sprocket associated with it. That doesn't come with the time chain kits though I will say that it is not a bad idea to replace it. I think the sprocket and the phaser are one peace? I can't remember exactly. If not, it would be wise to change the gear as well. The one on this engine was just as chewed up as the on in the comparison picture for the exhaust cam. Even without replacing that though, the timing fell right into place.

There are various O-Rings to replace on the timing cover and engine block that don't come in the timing chain kits either.

Great to hear, sir! That chain isn't as stretched as I guessed, but you can definitely see the wear in the sprockets. Maybe THAT'S the real issue? :huh:

Whatever, a fix is a fix.

I think its just a combination of everything that wears. The chain was stretched and the gears were warn, probably everything contributed to the slack in the chain system.