GTM Stage 2 TT: Engine Start Issues?
 

I see this happening every once in awhile. Sometimes the car takes longer to crank, and it sputters for a little bit before fully starting. Perhaps I released the clutch pedal too soon after pressing the button?

give it a lil love on startup ;)

Is this something new you just start experiencing or it has been happening sense day one of the TT install, Any changes made to the car recently ?

Sam

ive had the same issues recently and it only happens when the car is really hot at the track and I turn it off and on multiple times. Same exact desciption as you OP and doesn't happen all the time either.

It MAY be fuel related?? If you give it a little throttle it'll fire right up. No SES (CEL) and readings are all good on OBD2 (cipher) interested to see what comes out of this.

Hmm sounds like a posiable "hot start issuse",. I had on also. Different kit but had the same thing.

im not boosted but i noticed my car would have a hard time starting when hot with just res TP's..... i removed them and went back to stock now that hot start studder doesnt happen.

could this be something similar to yalls issue?

I'm not sure I do not have Tp's or HFC's. Maybe it's something with the temp of the 02 Sensors in the cats, or TP's in the case above,

exactly!

Mines the same I just feather it a bit on startup

I used to have hot start issue, but my tunner fixed that vai Uprev.

The only new addition is the manual boost controller, but I've experience this sputtering at least twice the past few months. This past week it happened 2-3 times. When it happens it cranks, the engine barely turns and dies for a brief second, sputters up like an old muscle car, and then idles like normal with no hiccup. The starter doesn't struggle or run continuously, so it sounds normal. Basically it's a rough start.

I tried to reproduce it tonight since it's pretty warm today, but it was fine. Car just starts up and idles around 700 RPM. Since the turbo install I don't notice the car briefly revving up on a cold start.

This is what I've been noticing. When the engine starts, the idle drops close to 0 RPM mark (sometimes almost dies), and then it crawls back up to normal idle speed. So there are times it'll hang close to the 0 RPM mark too long and "dies" for a half a second.

It's getting worse. This is the first time the engine died trying to startup. It starts up on the second try, but it's rough. Then I shut it off and start it, and it's fine. I guess I have to let it sit for awhile. It happened twice today.

So this is the hot start issue some owners have described? If it's a new tune, I'd need to upgrade to the tuner license and get it tuned somewhere. Not so high on the priority list at the moment.

Maybe a bad spark plug?

It idles and runs fine, though. Quiet and smooth (for the most part haha).

Checkout this post from another owner:
http://www.the370z.com/1678591-post81.html

Well, you meet Chad when you came up to KC and he's gonna solve my hot start issues. Even though I don't have the GTM system, I'm sure it's all caused by the same issues.

The engine start problem is coming back. This time it doesn't feel rough at all. I start it up 3 times. It starts as usual, gets to idle range, and then drops down to 0 RPM and dies as if I manually shut off the engine. I wait a bit and then try to give it some gas as it revs up and it's able to fire up and not die.

It doesn't happen all the time. I'll drive somewhere, park for a bit, then come back and it starts up fine.

I've not seen the car idle rough, and it drives fine. Would a vacuum leak cause this issue?

Funny cause mine just started acting up also , Last week,

Have you checked for leaks?

A vacuum leak wouldn't cause it to only happen at start up though. It would cause the idle to run higher than normal and most likely throw a code.

Phuong,

I just went back and checked and I don't think I ever received any logs back on your car after the install. If nothing has changed on the car and you are still running on our tune, I'm pretty confident I can get it resolved for you. Just go ahead and e-mail me your ROM ID and I'll track back your tune.

Sam

I'll try to get a hold of a laptop and pull the ID in a few days. The car hasn't died on me from running errands all day other than his morning. I've never seen it throw a code or idle rough either. Everyone comments how smooth the car is to drive.

Is there anything else you want me to log besides getting the ROM ID?

Right now I have the boost set close to 9 PSI, and I plan to get your 3" down pipe, external wastegates, and recirculation kit along with Fast Intentions 3" TDX exhaust in a few months. That pretty much finalizes the setup.

[EDIT] I got a hold of a laptop and installed the software, and I also found the installation manual. I'll follow the steps and send you the data this weekend.

[EDIT] I sent you the ECU part number and data logs.

Here's the dyno plot from March:
http://www.the370z.com/members/digit...t-lb-9-psi.jpg