jasonrs2

A buddy of mine got her supercharger a week ago and has not had any issues. I was giving her rides to and from the dealership while they were installing it since they lend out the reflash to some other dealer and took a few days to get back. I know the mechanic and he has 2 mk4 supras pushing nice hp numbers. This guys knows his stuff, does all the work on his cars. So the car isn't making any noises out of the ordinary chirping and additional vibration. Her car runs like a champ.

Anyway, she told me about some problems she's been having only during morning cold starts. When the key is turned to ignite the engine, it bogs for a second or 2 trying to turn on, then shuts off. The second attempt is always successful and she doesn't have any issues throughout the day turning the car on and off. Is this normal? The weather in the morning, I'd guess, is 60-70 degrees. We usually have 70+ throughout the day. Can someone tell me if this is normal and why? if not, what can be done to fix this and should she take it to the dealer?

thx.

Yankee21

If I leave mine outside for the night, in the morning it bogs and then it starts....

dgHotLava

i know mine does that too (xb issue though)
it is a fuel pressure problem.

the line loses presure over several hours.
the fuel pump only turns on when the motor is turning (cranking). so it takes 2-3 seconds for the pressure to build again.
by this time you think the motor fired up fine, but it still has a lag in pressure and stalls.
thats why on the second go...the pressure has come back up and runs fine now.

jasonrs2

thats good to hear. i mean, i dont know if its good, but it calms me down a bit. i read this and theres a part about cold weather. it basicallys says that when you perform a cold start-up in temperatures below 25 degrees, the supercharger can result in immediate failure. we're nowhere near that here, but i can sorta see how it bogs and turns off.

yankee, when yours bogs, does it shut off all the way or does it just take a little while to come up? thanks in advance.

Yankee21

It takes a little while, but there has been a time or two that it shuts off

jasonrs2

that helps. i want to get as many peoples input as possible. but so far, this seems normal and i appreciate the explanation. im just surprised the dealer didnt tell me anything - actually, im not surprised. lol. if anyone else can add their inpuit, that would be great.

Basstrack17

well, as opposed to the beautiful warm weather you have down there, we get the real cold stuff up here.... and we've never had ours stall when even below zero. I will say that on those colder mornings it popped right away but was "sluggish" for a split second, but my FJ could do the same. I'm assuming it's nothing, but if it ours was doing that and in moderate temps, and you aren't even in your "cold" season, i'd have it checked to make sure all is well.
I'm assuming also that she is running premium in it?

jasonrs2

yea, i'll advise her to have them check it out, just in case.

and yes, the car is being fed miami's finest 93 octane fuel. lol.

jasonrs2

bump! cmon, i need more input! lol.

jrussell98003

Mine has never done that, even when it's sat in the cold (30s) overnight. I've had my s/c for a little over a year.

KiKaZ-tC

iTrader: (1)

I get a slight bog when starting my s/c tc after leaving it outside all night (even over here in CALIF.), but only a bog, then startup; my s/c tc has never bogged and not turn on though... It doesn't happen as much now that i park it in the garage. I also seem to get a better startup by turning the ignition to the 'ON' position for about 5 secs and letting some fuel run through the fuel lines before actually starting the car.

KiKaZ-tC

iTrader: (1)

also, every morning before i BOOST, i will avoid the on ramp near my house and actually drive one or two main streets over with a light foot to the gas pedal, shifting at 2500 rpm until my temp. guage is at normal operating temp. for about 2 minutes before boosting or taking my car above 2500 rpm. I read this from Vortech's superchargers street maintenance guide.

dgHotLava

thats true with any car...

06SuperWhite_SoCal_tC

Unlike Turbo applications we don't need to let our motor cool when we shut it off, but Superchargers do Require a Warm-up period when first starting the car after it has sat. Also you should not let the s/c go into boost untill it has reached full operating temperatures.

Rydrdg

mine choke too, in the morning, then after the second try it starts like a champion.

TongMan

Mine does that too...i guess it's normal...or not?

cessblood

My friend's car does that too. it didn't happen to me yet.

amdforever

There is actually another thread about this running around here somewhere for the tC's. Seems to be common thing for some people and not so common for others. All the temps are different as well. IE it happens to some that live in cold areas and others that live in warm areas. It always happens on the first cold crank of the day after it sits overnight, and now it appears that maybe S/C have the same problem as the N/A guys do. I know they were trying to rule things out b/c no dealership has been able to figure it out yet, as it only happens every now and then and of course can't be replicated by them when you bring it to them. Some suggestions are gas(dif. brands, stations, octane), dif oil weights, electrical system, and my personal opinion, the fuel pressure system. Did your friend ever experience that happening before she got the S/C put on her tC? My car has only done it to me about 3 or 4 times and its just really random and I've had it since july of 06, other people experience atleast once a week, other just every now and then, so it is a weird situation indeed, and hopefully she can figure it out. I believe Scion/Toyota should look into it but I don't think its drawing a big enough crowd yet to worry them. Try having her turn the key to "on" for a few seconds, before she turns to the point to start the cranking of the motor, this may allow the fuel pump to activate and build pressure.

jasonrs2

that seems to fix the problem. can everyone who usually experiences this try turning the key to the "on" position, wait for the beeps to stop, and wait 3-5 seconds before cranking the car? my guess is also the fuel pressure system. thanks to KiKaZ-sC for the suggestion. hopefully we dont get that again.

dgHotLava

i could leave the key in the on position all day and night...it won't do a thing as the pump wont come on untill the motor starts to turn...