 car has trouble starting, what could it be? |
 Oct 27, 2006 - 12:05 AM
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 Enthusiast  Joined May 12, '06 From Wilmington, NC Currently Offline Reputation: 45 (100%)  |
yeah, I've pretty much noticed this since a little before I got the car, but when I go to start it up after it's been sitting a few hours, it'll start, and the RPMs will shoot up to where they are supposed to, but when they come back down, they don't stop at 750 or whatever idle is and keep dropping until they reach zero and the car dies... so I'll start it back up, and in order to keep the RPMs up, I'll rev the engine. but as soon as I let go of the gas they drop real low again, so I rev again. usually, once I rev it to ~6000 and let it come back down it'll idle fine and then run fine for the rest of my trip, and if I shut it off for a while and come back, it'll be fine. but if it sits for 6 hours-ish or more before I start it up again it'll do it again...
what could be causing this? --------------------  94 GT - Sold -------- 69 Pontiac Lemans - Sold 88 Alltrac - Sold ---- 04 WRX - Sold 00 GT-S - Sold ------ 91 Miata - project/drift car 95 GT - Sold -------- 96 GT - New Daily Drive |
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Oct 28, 2006 - 8:13 PM
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 Enthusiast Joined Aug 31, '02 From Philadelphia, PA Currently Offline Reputation: 8 (100%) |
you have to have 2 hoses hooked to your intake piping between the turbo and the afm. one is for pcv and one is for the cars idle valve. make sure that one is hooked up and trace it all the way back to the throttle body to make sure there arent any cracks or air leaks along the way.
-------------------- 15PSI - 30MPG - Megasquirt Tuned
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Oct 28, 2006 - 8:36 PM
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Enthusiast Joined May 12, '06 From Wilmington, NC Currently Offline Reputation: 45 (100%) |
QUOTE(lagos @ Oct 28, 2006 - 6:13 PM) [snapback]497158[/snapback] you have to have 2 hoses hooked to your intake piping between the turbo and the afm. one is for pcv and one is for the cars idle valve. make sure that one is hooked up and trace it all the way back to the throttle body to make sure there arent any cracks or air leaks along the way. I don't have a turbo... unfortunately  in any case, the hose that connects from my valce cover (PCV?) to my intake is pretty new. The same hose is split so it can go to the nipple coming off the bottom of the throttle body (idle valve?). the stock hose when from the throttle body to the valve cover, but I split it to go to the intake too, since I thought I was supposed to(see this thread) also, the smoke machine didn't reveal any leaks from any hoses. QUOTE(toyotacrazy @ Oct 28, 2006 - 6:33 PM) [snapback]497163[/snapback] It could be a dirty throttle plate throwing the computer off. Have you cleaned it? Also the IAC motor and the EGR valve are common suspects.  so it could be the EGR valve? because the smoke test did show a pretty decent leak from my EGR. -------------------- 94 GT - Sold -------- 69 Pontiac Lemans - Sold 88 Alltrac - Sold ---- 04 WRX - Sold 00 GT-S - Sold ------ 91 Miata - project/drift car 95 GT - Sold -------- 96 GT - New Daily Drive |
Posts in this topic
6strngs car has trouble starting Oct 27, 2006 - 12:05 AM
LewFX iac=IDLE AIR CONTROL VALVE Oct 27, 2006 - 12:13 AM
6strngs QUOTE(LewFX @ Oct 26, 2006 - 10:13 P... Oct 27, 2006 - 12:24 AM LewFX http://www.lewfx.com/throt0.pdf Oct 27, 2006 - 12:34 AM 6strngs QUOTE(LewFX @ Oct 26, 2006 - 10:34 P... Oct 27, 2006 - 1:07 AM 6strngs ok, took my car to my auto class today. hooked it... Oct 28, 2006 - 7:22 PM toyotacrazy It could be a dirty throttle plate throwing the co... Oct 28, 2006 - 8:33 PM lagos my bad, i got you and 6gsillyca mixed up .
eithe... Oct 28, 2006 - 8:48 PM 6strngs QUOTE(lagos @ Oct 28, 2006 - 6:48 PM... Oct 28, 2006 - 8:49 PM cheeco its not a vacum leak at the IAC thats causing the ... Oct 28, 2006 - 9:05 PM 6strngs QUOTE(cheeco @ Oct 28, 2006 - 7:05 P... Oct 28, 2006 - 9:14 PM cheeco just remove the throttle body, the iac is attached... Oct 29, 2006 - 12:01 AM 6strngs QUOTE(cheeco @ Oct 28, 2006 - 10:01 ... Oct 29, 2006 - 10:32 AM hitcachi QUOTE(6strngs @ Oct 29, 2006 - 10:32... Oct 29, 2006 - 11:00 AM 6strngs QUOTE(hitcachi @ Oct 29, 2006 - 8:00... Oct 29, 2006 - 11:49 AM cheeco you dont have to drain the coolant. some will spil... Oct 29, 2006 - 1:55 PM 6strngs ok, I never did come back to update. I took what ... Dec 5, 2006 - 3:21 AM hitcachi Are you throwing any codes? Dec 5, 2006 - 11:52 AM 6strngs QUOTE(hitcachi @ Dec 5, 2006 - 8:52 ... Dec 6, 2006 - 1:39 AM 6strngs alright, I tried figuring out what was going on a ... Dec 6, 2006 - 6:23 PM LewFX you need a new gasket if its leaking on the sides Dec 6, 2006 - 9:34 PM 6strngs alright, I'm gonna see what I can learn tomorr... Dec 7, 2006 - 3:12 AM Negative The thing you think is your PCV is the spot where ... Dec 8, 2006 - 11:44 AM 6strngs QUOTE(Negative @ Dec 8, 2006 - 8:44 ... Dec 8, 2006 - 7:38 PM 6strngs tomorrow morning will be the ultimate test. if it... Dec 9, 2006 - 3:42 AM Negative Sounds like you got the right idea. hope it works ... Dec 11, 2006 - 7:47 AM 6strngs yeah, I was about to declare that I had fixed the ... Dec 11, 2006 - 11:33 AM hitcachi If you do pull the valve cover off, then yes you h... Dec 11, 2006 - 12:59 PM |
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