Does the clutch switch affect fueling?
10-22-2009, 03:10 PM
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Does the clutch switch affect fueling? I'm talking about the upper switch that also deals with cruise control. Does it affect fueling or any other part of the tune? I ask because I pulled the switch apart and switched it so that it's open when the clutch is out. I changed my intake at the same time but the car went stupid lean on my first log so I was wondering if the switch may have something to do with it?
BTW I'm running in OLSD.
BTW I'm running in OLSD.
10-25-2009, 12:17 PM
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I'm talking about the upper switch that also deals with cruise control. Does it affect fueling or any other part of the tune? I ask because I pulled the switch apart and switched it so that it's open when the clutch is out. I changed my intake at the same time but the car went stupid lean on my first log so I was wondering if the switch may have something to do with it?
BTW I'm running in OLSD.
BTW I'm running in OLSD.
10-25-2009, 12:41 PM
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I just switched from a lid to a custom dual 4" ram air w/ no filter, it was in the high 15's at wot. DFCO is disabled but I also posted this on the HPT site and found that there may be a CFCO that I don't think I have access to. Either way, at this point I'm pretty sure it's a fuel system issue causing it to go that lean cause it's fine at part throttle yet goes very lean at WOT even after I tried to correct it. My latest log shows afr in the low 14's yet the injectors are maxed out.
10-25-2009, 01:17 PM
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No the injectors were never maxed out, I don't think they ever even went above 85%. Everything looks good until I go WOT then it leans out as rpm raises. I don't think it's the intake either. I just finished rigging up a fuel pressure gauge so I'm about to go out and see what I've got at WOT, that should narrow things down a bit.
10-25-2009, 04:27 PM
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I just went for a test drive and the fuel pressure is dropping to 30psi at WOT in the higher rpms, so I've found my problem. Thanks for the help.
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10-25-2009, 06:45 PM
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If the fuel pressure is ok at idle and part throttle but drops at WOT/high rpm wouldn't it be the pump? I don't see how the regulator would cause it, but the pump only has a few thousand miles on it.
