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Subject I had a similar issue which I solved, but my answer may not
     
Posted by treese88 on June 05, 2012 at 8:02 AM
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In Reply To Cold start timing advance issue? posted by beanz on June 04, 2012 at 12:27 PM
     
Message be helpful. I utilized Nistune and do not remember the specifics of the maps I changed to make the car run properly and not bog when it is cold. I to had replaced basically everyone sensor and tried testing all of the common problems.

My car was almost undrivable until it hit that magic temp ~130 where the timing changed and it then ran like a top. I believe what I did was change the cold timing maps where it changes timing so they barely did anything. A bandaid, but it worked (and this was the biggest headache of my car for a long time).

Now here is the kicker...I have since gone to normal timing maps and the cold issue is gone. I do not know what in particular fixed it so I will list some things I did between then.

Things done that may have fixed issue without band-aiding maps:
-Changed timing belt (had already been done 2k miles earlier, cogs count was normal)
-Tried a different timing light which resulted in a different timing (CAS no longer centered for 15, this is definitely worth checking. Previous light was ~20 years old)
-Changed fuel filter (was practically clogged)
-Changed spark plugs (spec Z heat 7 from oem tt)
-Cleaned out fuel tank
-Swapped injectors from Deatschwerks to Nismo
-Synced TB's (don't think this was the solution as I did it recently, but it is very easy to do)
-Changed o2 sensors
-Used a different base .bin in Nistune (had already tried, but whatever changed works now)

I can't think of anything else I did that could have made this go away. This was the single most frustrating thing with my car. Any issues I've had since then have been purely tuning related, I think (don't trust wideband sensor anymore). Runs fine cold though.

Tried to give a lot of information so maybe something will click for you. I wish I knew what solved it. Until then, maybe SZ can modify some maps for you, though it is best to solve the problem instead of bandaid.

Good luck!


     
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