Unplugged Battery, Car Now Stalls On Startup

[xscape237]

Folks.

I unplugged my battery while working on the car, and now it does not start properly when the motor is warm. I have to blip the throttle otherwise it stalls.

Otherwise the car is fine, running better than ever.

I tried the ECU rest, idle resets, etc, but its hard to tell if i was successful.

Any ideas on solutions? Or is it just a matter of time while the ECU relearns?

Cheers

[rs73]

did you leave any O2 sensor or AFM unplugged?

[Touge Kyousou]

You need a new PCV valve methinks..

As an interim solution, remove the PCV valve, thoroughly clean with carby cleaner, reinstall, start and warm up car, then off-start (it may still stall), off, start, off start a few times. Soon after it won't stall anymore.

I did the above process and while straight after cleaning, it stalled after i started it about 3-4 times.. the next time i drove the car a few days later it didn't happen again. Getting a new PCV valve myself..ebay USA have 'em.

GL.

[Blue Arrow]

Folks.

I unplugged my battery while working on the car, and now it does not start properly when the motor is warm. I have to blip the throttle otherwise it stalls.

Otherwise the car is fine, running better than ever.

I tried the ECU rest, idle resets, etc, but its hard to tell if i was successful.

Any ideas on solutions? Or is it just a matter of time while the ECU relearns?

Cheers

i had the same problem a while back when the battery died. it took a while but it looks like the ecu was able to make the adjustment. i was thinking of bringing it in for service because it was annoying (being a manual) but it eventually fixed itself. but like i said, it took a few weeks. have not had the problem since.

[BLISTC]

dont worry about it

all the cars do it

ECU will eventually re-adjust and it will be ok.

[Touge Kyousou]

After your cars fixed itself..do your revs drop below normal idle setting (550rpm) when you clutch in to goto neautral, or also when you goto neautral and brake hard/semi hard ?

[BLISTC]

nope it does not.

its happened to me twice now, when i d/c the battery when i installed something, and when i went overseas and dc the battery. both times the problem went away within 3 days.

[Touge Kyousou]

Interesting!

Good to know thankyou .

Almost certain a couple of NM35 stagea owners also had problems with hot start stalling, but like me they also suffered from revs dropping below idle on clutch in sometimes, especially under semi hard to hard braking. I've got the thread bookmarked but too lazy to open lol. Anyways, when one of them replaced their PCV valve, problem solved. I cleaned mine and the car is definitely running smoother.

I must say sounds like Xscape is having issues with the battery d/c then, not the valve.

[rs73]

Brad, what were you doing with it actually?

[rs73]

and are you coming to the meet this weekend? hope the issue won't affect

[xscape237]

Thanks guys. I will see how it goes over the next couple of weeks then.

Rianto, Saturday is doubtful for me at this stage as I have a date with a dyno. If anything I will make it to the car wash very briefly - it is filthy as hell afterall.

Anyway. The problem occurred after 30 minutes of having the battery disconnected. I was waiting for the motor to cool down before attempting to install my plenum spacer, but got impatient and decided it would be best to tackle it the next day. Hooked up the battery again and it wouldnt start properly.

On that note, I've since installed the spacer (motordyne iso thermal kit) and my review is that yes there appears to be a very slight increase in power. I got the kit with the additional gasket (b/w lower plenum and heads) and the coolant bypass valve - both of which seem to be working as the plenum is much cooler to touch after going for a spirited drive. Worth the money? provided you dont pay for installation - definitely.

Cracked open the plenum, wasnt too surprised to see 70,000 kms worth of caked on oil and carbon.

Carby cleaner FTW

[whtbox]

so you are saying that you disconnect your battery and decided not to do the plenum install? Then plug the battery back in and stall all the time from starting up the engine?

[xscape237]

Thats correct.

It was unplugged for about 30 minutes, maybe a bit longer.. Was getting too late in the afternoon and the motor was still hot so i plugged it back in to move the car.. and it kept stalling on start up unless i blipped the throttle.

I did the plenum install the next morning.

The car starts normallly when cold and drives perfectly fine all the time. Its just hot starts that are giving me trouble.

[whtbox]

that's very abnormal lol. Sorry can't help on what's the causes.

[BLISTC]

its not abnormal

it happens to alot of peoples cars

and yes it only happens on hot starts. cold starts are fine.

dont worry about it, will go away.

[superspit]

its not abnormal

it happens to alot of peoples cars

and yes it only happens on hot starts. cold starts are fine.

dont worry about it, will go away.

EXACT SAME issue here....discon batt (as not using car for a while and GPS sucks power, flattens battery when parked).

PROBLEM IS that that was 3 weeks ago...after some driving, hot starts STILL require acc pedal depress to keep idling, then all's fine.

BUMMMMMMMER!

I need to find the PCV on this car!...anyone got a pic with an arrow pointing to it?...lol.

OR...bring up the idle (how to do how to do?) by 150 rpm and that seems to solve it (simulated by slight pedal depress mimicking 150 rpm increase seems to work).

Cheers.

[ajc300gt]

Having the exact same problems on my vq30dd. I think mine's related to battery, going to give it a good run and charge and see if that cures it.

[ajc300gt]

Having the exact same problems on my vq30dd. I think mine's related to battery, going to give it a good run and charge and see if that cures it.

- Nope didn't fix it, going to try PCV and inspect throttle body next...

[superspit]

- Nope didn't fix it, going to try PCV and inspect throttle body next...

Got mine fixed a few weeks back, during a major service.....(46000 km)

Throttle body had to be removed and cleaned, (it was filthy) some sort of callibration of the throttle had to take place....now all ok. (idles nice and won't stall on warm start!)

I try really hard now not to let the battery go flat!!...(could be just coincidental, but I ain't taking any risks).

Oh, as for PCV valve?,,,,,I couldn't find mine!!!....(nor could the mechanic!)...anyways, car is great now.

[xscape237]

- Nope didn't fix it, going to try PCV and inspect throttle body next...

Did you have the battery unplugged?

If so, give it a few days of regular driving and it will go away.