Very rich on Startup only??
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Very rich on Startup only?? Since I got the new motor in and using the 30# SVO inj. and the TR230 cam, my car runs pig rich on start up's. The PCM was tuned and my only problem besides 3.9* KR at WOT is when I start the car cold it dies right away, so I start again with slight throttle and it smokes quite a bit a runs a little ruff for about 10 seconds then it runs fine on it's own, it does this when it's hot too, but not as bad, but it also suges more when hot. When I had it tuned, I was getting a MAP reading of 55-60 KPA on start up, I believe it's normally in the 35-40 KPA range. I don't know much about tuning, but can there be a mechanical problem causing this (broken valve spring)? or the removal of the AIR system? Any ideas?
TIA,
Dan
TIA,
Dan
Re: Very rich on Startup only?? I had this exact same problem also; infact, there are two black sooty patches on my garage floor made from start-ups. I cured it by scaling down the Open Loop Fuel Air Multiplier by 75%, and the Main Volumetric Effeciency by 80%.
Thread Starter
10 Second Club
iTrader: (5)
Joined: Nov 2001
Posts: 3,412
Likes: 0
From: Cali/Bay Area
Re: Very rich on Startup only??
I had this exact same problem also; infact, there are two black sooty patches on my garage floor made from start-ups. I cured it by scaling down the Open Loop Fuel Air Multiplier by 75%, and the Main Volumetric Effeciency by 80%.
Thanks,
Dan
Re: Very rich on Startup only?? I don't understand why you would need to change the open loop fuel/air table when you are adjusting the VE table. The VE table is more of a global setting, not just open loop like that table. Kinda seems unnecessary.
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Re: Very rich on Startup only??
I changed the VE table for a different reason actually, my car was idling rich even after going into closed loop.
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Verdad Gallardo Re: Very rich on Startup only?? I adjusted the VE down because my car was idling very rich on both hot and cold start-ups; no problems getting it to start, though. Well once I did that, hot idle was good, but any other time it was still rich and had an erratic idle until it went closed loop. So I cut back the VE some more, but got stumbling and bogging. So I put the VE back to 80%, and tried a few different settings on the Open Loop mixture until I got something that worked. It's still a little out of whack in open loop(rich I think,) but much better than before.
