|
this is on my new motor, still in the break in period, only have like 400 miles on her. everything was normal and then this happened. she'll crank really fine, but in order to get her to start i have to push the gas pedal. after she starts she runs fine. i can shut the car off and imediately start it up again normally when its hot.
any suggestions? i was thinking maybe the plugs have fouled since the car isn't tuned yet. but the plugs were pretty new right before the rebuild so i didn't change them. it does the same thing whether Idle Control is plugged in or not. i'm single, with a big port and PFC. motor has only 400 miles, haven't taken it above 3000 rpms. previously the motor was stock port and i'm still running that map. car runs fine when started (up to 3000 rpm anyway, actually it is a bit jerky...) thanks, harrison |
Originally Posted by vspecpgt' date='Feb 3 2005, 08:16 AM
this is on my new motor, still in the break in period, only have like 400 miles on her. everything was normal and then this happened. she'll crank really fine, but in order to get her to start i have to push the gas pedal. after she starts she runs fine. i can shut the car off and imediately start it up again normally when its hot.
any suggestions? i was thinking maybe the plugs have fouled since the car isn't tuned yet. but the plugs were pretty new right before the rebuild so i didn't change them. it does the same thing whether Idle Control is plugged in or not. i'm single, with a big port and PFC. motor has only 400 miles, haven't taken it above 3000 rpms. previously the motor was stock port and i'm still running that map. car runs fine when started (up to 3000 rpm anyway, actually it is a bit jerky...) thanks, harrison Did you make the adjustments in the pfc for the injectors? |
i didn't make any new adjustments, i'm using the same injectors and map as before. the only new thing is that the motor is new and has a big port.
same turbo, same injectors, same map, ect..... i asked a friend about retuning just for vaccum but he said it should be fine, and we'll just retune when its broken in. |
I'd expect a change in starting ability with a 'big port'..
|
i can see that, but the first ~12 times i started it to drive, it would just start right up.... it doesn't seem to catch now unless i give it gas. why the sudden change?
|
Honestly, my guess is that a rich idle is causing this.. I had an identical problem on a stock-port, stock turbo motor, when I screwed around with my idle maps (which were totally rich) I was able to start it quickly. And I'm kinda thinking the plugs are a little coked.
|
what color should the tips of my spark plugs be? i just checked and they are very black, i would guess i'm just running rich, they should be a toasty brown color right?
i checked both T and L harrison |
i have the same problem with my car and hot starts... starting it when its cold... actually below 70deg F is pretty easy, and around 40 deg, it actually starts instantly. i have a feeling its more of a tuning problem rather than mechanical. it has to do with the temperature correction map, and a/f ratio i think
|
Brown to dark brown.. black is rich, black with lotsa grainy crap is way too rich.
|
Like I said it on the other thread, I think your plugs are the cause. I meant to ask you that last night. I guess I just figured you wouldn't put your old plugs back in if you had just rebuilt the entire motor anyways.
|
i only put the old plugs back in because they were "like new" i put them in one weekend, at pettit, drove home, drove to HIN and then drove to Fort Myers to take the car apart, almost all highway miles.... anyway i just bought some new bur9eq's.... another guy mentioned to just get 7's for breakin, but i already bought them.....
hopefully this will fix it, thanks so much for all your help everyone. harrison |
well i don't think its the plugs. I put brand new ones in and it still wouldn't catch on its own, i had to give it some gas..... maybe it will miraculously go away.
dunno if this is related, or just part of the map, but say if i'm driving a constant 50mph, it will be nice and smooth and then sometime it will just "burp". it'll skip a beat and then go back to normal.... its not a constant thing, and has no pattern, just happens every now and then. harrison |
yeah i think its tuning.... before my car was somewhat tuned, it drove like that... any change on my position on the map would cause it to hickup a little, but if i stay on one block on the map it drove fine
|
Try leaving the key in ignition 2 for a couple of seconds before cranking the motor. Maybe the fuel isn't primed enough.
Give it a try... what i like to do when trouble shooting this type of issue is by putting key in ignition two.. hear the fuel pump prime... key off... put key in ignition two again (hear fuel pump prime), then try starting the car. if this solves it .. we can at least narrow it down a bit. |
I think the fact that he has to 'give it gas' makes it a too-much-fuel problem. He's really not giving it 'gas' so much as opening up the throttle body butterfly valve and letting more air through - enough to get a good mixture.
I think if he had to pump the gas it'd be a different story.. |
well here's an update.... it decided to fix itself. for the time being, its working just like normal... i don't know if its something electrical or what, hopefully it will continue to work well, but since it fixed itself, at least for now, i can narrow down what its not.
thanks for all the help, i'll let you guys know if it messes up again. harrison |
so how did you fix it yourself?
|
| All times are GMT -5. The time now is 11:50 PM. |
© 2024 MH Sub I, LLC dba Internet Brands