Cold start issue

when I go to start the gti in the morning it turns and fires straight away but will die straight away.  If i plant the throttle pedal right down when it fires then it will really struggle only doing a couple of hundred rpm for around 5 sec then will rev.  As soon as its revved i can take my foot off the pedal and its running fine idling around 1000rpm.

I was thinking this might be the 5th injector making it far to rich, perhaps even pouring fuel in instead of spraying - as putting your foot down leans the mixture doesnt it?

What does everyone think?

cheers

Leaky injectors? Search for prowlers injector test and give it a go.

Let us know how you get on.

ok will try that....jusy got to buy 4 things that come in bottles...mmm....good excuse to buy beer!!

I would pull the 5th injector and test that first. From cold it should fire for upto 12 seconds while cranking then stop. Anything else and there could be a fault with it or with the thermotime switch. Easier to do than the full injector test is all.

not hijacking your thread or anything but i am having the same problem. its like you were describing my cold starting.  i disconnected the coolant temp sender which effectively kept the 5th injector from coming on and it acted differently but not right.

i too am thinking that the spray pattern on the 5th may not be good, maybe its just pouring fuel into cylinder 1.

keep us posted and i will do the same!

lateral_G said

 i disconnected the coolant temp sender which effectively kept the 5th injector from coming on and it acted differently but not right

It's the thermotime switch which controls the cold start injector, not the temperature sensor…

woZa said

lateral_G said

 i disconnected the coolant temp sender which effectively kept the 5th injector from coming on and it acted differently but not right

It's the thermotime switch which controls the cold start injector, not the temperature sensor…

on the transmission side of the block, up near the head, 2 wires connecting right?

Check your warm up reg, and your auxillary air valve.

hi i had the same problem with mine it was leaky injectors brought 4 new ones from gsf car runs fine now

i pulled the 5th injector today and watched its spray pattern as a friend fired up the car.  the patter was very good.  it shot about 20" and atomized into a super fine mist.

that seems to kill the theory that the fifth wasnt spraying well and just dumping or pouring fuel into no 1 cylinder.

what next?

rossirvine, have you done any more troubleshooting?
thx

not yet mate, been v busy at work on nightshifts (who would have thought it would be so busy at a car factory at the mo - lol!)  so aint had much time or energy!!  Hopefully get out over the next few days - if it ever warms up a bit!

hmm - things have taken a turn for the worse - see my next post in this section