Deza3000 Posted July 15, 2012 Share Posted July 15, 2012 Hey guys, as the name suggest i've been having some unusual start up problems when i turn the car on in the morning. Usually what happens is when i start the car, the engine starts, but struggles to keep the revs high and vibrates excessivly (kinda like a lawn mower running out of petrol), then the car suddenly revs to like 2000rpm and then calms down and idles normally. In some cases when the temperature is cold and i havent used the car for like 1 or 2 days, the car starts, vibrates excessivly, and stalls. Then when i try starting it the 2nd time it works fine. I first thought it might be the fuel pump, or spark plugs but i got the spark plugs changed just last year. There is no symptoms of a dodgy fuel pump so ive ruled those 2 out. All i can think of is a dieing battery, but the car starts normally during the 2nd start so not sure what it could be. Additional information: Sometimes when i start the car, and it struggles to start, i tap the accelerator lightly for barley a millisecond and the engine will suddenly start up and everything is normal. Cheers in advance guys Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/ Share on other sites More sharing options...
MatthewT85 Posted July 15, 2012 Share Posted July 15, 2012 its exactly the same sort of problem i have, but for me it has started after i changed my fuel pump to an 040, did a bit of reading and people have said to clean afm and the aac valve i think its called, i havent tried it yet been a bit lazy... Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6444913 Share on other sites More sharing options...
Deza3000 Posted July 15, 2012 Author Share Posted July 15, 2012 (edited) Ill give it a shot tomorrow, hopefully it gets it starting up normal again. But if it is the aac valve, wouldnt the general idling of the car be dodgy as well?? Cause aac valve controls idle's i believe and my car idles fine but starts up bad, i could be wrong though. Ill give it a shot either way. Cheers Edited July 15, 2012 by Deza3000 Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6444953 Share on other sites More sharing options...
dyl33 Posted July 15, 2012 Share Posted July 15, 2012 When you start it (cold start morning) does the rough/lumpy/shit idle sit at 500rpm for a few seonds, Then goes up to 1500-2000rpm and it's fine? Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6444972 Share on other sites More sharing options...
Deza3000 Posted July 15, 2012 Author Share Posted July 15, 2012 When you start it (cold start morning) does the rough/lumpy/shit idle sit at 500rpm for a few seonds, Then goes up to 1500-2000rpm and it's fine? Hey dyl33, Yes what you described is exactly what happens! in some cases it stalls but yes thats pretty much whats happening. Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6444978 Share on other sites More sharing options...
dyl33 Posted July 15, 2012 Share Posted July 15, 2012 I'm not sure what is causing it, I've got brand new fuel pump/filter,afm,coil packs/plugs, So I can rule them out, Going to clean aac valve and go see my mechanic. I think it only started after really cold mornings. Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6444987 Share on other sites More sharing options...
Deza3000 Posted July 15, 2012 Author Share Posted July 15, 2012 Yea must be the aac i guess, ive read some forums and people have seen positive results when cleaning their aac. Maybe its just a r33 problem, my mate who owns a r33 also has dodgy start ups in the morning, mine however seems to be getting worse. Ill try putting in a new battery as well, see if that helps. Cheers for your input =) Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6444995 Share on other sites More sharing options...
dyl33 Posted July 15, 2012 Share Posted July 15, 2012 I'll let you know what my mechanic says this week, Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6445000 Share on other sites More sharing options...
Deza3000 Posted July 15, 2012 Author Share Posted July 15, 2012 That would be really helpful! Thanks heaps mate =) Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6445009 Share on other sites More sharing options...
hamiltonau Posted July 16, 2012 Share Posted July 16, 2012 Happened to mine for ages, went to a mechanic last week (Uas in western Sydney) and he found a few leaks in the rubber hoses around the engine. Lol don't ask me which ones or what they were connected to. He plugged the leaks and now no idle issues at start up or ever! Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6445286 Share on other sites More sharing options...
drunkn snail Posted July 16, 2012 Share Posted July 16, 2012 I get the same problems in the morning if left overnight, think its pretty common, only thing I'm concerned about is not building oil pressure while it struggling Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6445506 Share on other sites More sharing options...
Deza3000 Posted July 18, 2012 Author Share Posted July 18, 2012 Yea thats my problem, but there should be a valid reason why they struggle so much every morning on start up =[ Mine is really bad now, it just stalls. Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6449007 Share on other sites More sharing options...
dyl33 Posted July 19, 2012 Share Posted July 19, 2012 mine stalls first time, unless I push the throttle before Havn't been to the mechanic yet. Have you had any new findings Deza Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6451095 Share on other sites More sharing options...
OEM_as_f*ck Posted July 20, 2012 Share Posted July 20, 2012 Hey guys 90% of the time these problems are the idle control valve. When you first start it in the morning, the ECU runs the motor a little rich for a few minutes, like a choke on a carburetted engine. This improves cold starting and idles the motor a little higher to help build oil pressure and warm the motor quickly. If the idle control valve is blocked or not opening correctly, less air will enter the engine. Not enough air combined with the already rich fuel mixtures means that the engine is simply going to run like shit until the choke is cancelled either by you blipping the throttle or by restarting the engine. Hope this helps Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6451628 Share on other sites More sharing options...
Deza3000 Posted July 22, 2012 Author Share Posted July 22, 2012 mine stalls first time, unless I push the throttle before Havn't been to the mechanic yet. Have you had any new findings Deza Its better than it was before, i did the same thing you did and pushed the pedal before it stalls. Seems to start up fine that way. Still would be better if i could start it up normally without any problems. Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6454392 Share on other sites More sharing options...
Deza3000 Posted July 22, 2012 Author Share Posted July 22, 2012 Hey guys 90% of the time these problems are the idle control valve. When you first start it in the morning, the ECU runs the motor a little rich for a few minutes, like a choke on a carburetted engine. This improves cold starting and idles the motor a little higher to help build oil pressure and warm the motor quickly. If the idle control valve is blocked or not opening correctly, less air will enter the engine. Not enough air combined with the already rich fuel mixtures means that the engine is simply going to run like shit until the choke is cancelled either by you blipping the throttle or by restarting the engine. Hope this helps Cheers, ill try cleaning it, i wasn't very keen on doing it myself, might just pay a mechanic to clean it for me. Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6454395 Share on other sites More sharing options...
dyl33 Posted July 23, 2012 Share Posted July 23, 2012 I'm awaiting my new AAC valve gasket, Then ill give it a clean. See how that goes Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6454813 Share on other sites More sharing options...
Deza3000 Posted July 24, 2012 Author Share Posted July 24, 2012 I'm awaiting my new AAC valve gasket, Then ill give it a clean. See how that goes Hopefully that cures the problem, if not then it really is a mystery. Ill give it a shot as well, Might have to purchase a aac gasket from ebay. Ill try find a walk-through of how to remove the aac valve. Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6457964 Share on other sites More sharing options...
Deza3000 Posted July 24, 2012 Author Share Posted July 24, 2012 Found a DIY on cleaning the AAC valve. Hopefully this does the trick http://www.skylinesaustralia.com/forums/topic/110431-diy-aac-valve-cleaning-idle-reset/ Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6457970 Share on other sites More sharing options...
tripsteady Posted July 24, 2012 Share Posted July 24, 2012 Hey guys 90% of the time these problems are the idle control valve. When you first start it in the morning, the ECU runs the motor a little rich for a few minutes, like a choke on a carburetted engine. This improves cold starting and idles the motor a little higher to help build oil pressure and warm the motor quickly. If the idle control valve is blocked or not opening correctly, less air will enter the engine. Not enough air combined with the already rich fuel mixtures means that the engine is simply going to run like shit until the choke is cancelled either by you blipping the throttle or by restarting the engine. Hope this helps so is this the definitive cause? would it also be leaks as suggested? Link to comment https://www.sau.com.au/forums/topic/404800-r33-skyline-start-up-problems-in-the-morning/#findComment-6458175 Share on other sites More sharing options...
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