Subject	Same issue here - 2 different cars.
Posted by	Mongoose on October 16, 2013 at 11:41 PM
	This message has been viewed 192 times.
In Reply To	Small Cold Start Issue posted by baggar11 on October 14, 2013 at 05:22 PM
Message	My car would do this, but I never figured out why. I had an ECUtalk setup connected, and could watch the engine temperature and dymanic spark timing, and this is what I saw: With coolant temperature below 130 deg F (right before your stock coolant temp gauge starts to move up), the car would seemingly randomly pull spark timing back to 15 deg, and sometimes it would be up around 40 degrees. The pull to 15 degrees is the bog you feel, and when it jumps up to ~40, you get a surge. It also seemed to happen (sometimes) when I lightly pressed on the gas pedal. After the coolant temperature passed above 130 deg F, this _never_ occured. This is why it doesn't happen with a "warm" start. I've noticed these symptoms on 2 different Zs, both in stock form and then later with intake/exhaust/ECUs. It's much more noticeable on a modified car, but it was still present in both cars in stock form. Anyone have any more info? I've been scratching my head over this one for years. -Jason
Follow Ups	Small Cold Start Issue - baggar11 17:22:08 10/14/13 might be worth checking TPS voltage and ecu temp sender - Medallion Man 08:48:36 10/15/13 Read through the sheet... - baggar11 10:26:28 10/15/13 My car used to do that at any temp - -Grimm- 10:01:32 10/15/13 Any chance a TPS could be bad but still give - baggar11 10:24:41 10/15/13 I wouldn't be able to say about the Z TPS itself - -Grimm- 11:06:36 10/15/13 Thanks. Looks like new TPS's are $80. - baggar11 11:42:05 10/15/13 Same issue here - 2 different cars. - Mongoose 23:41:45 10/16/13 ever change coolant temp sensor? (n/m) - 300ZMang 19:46:43 10/18/13
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