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01-20-2014, 05:01 PM
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#31
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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I cleaned the injectors and installed new screens and seals. It helped but it still has the light stumble. I also took a look at the lower intake gaskets but they looked fine. I even pressurized the crankcase to see if they would leak but they didn't.
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01-26-2014, 09:23 AM
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#32
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Super Moderator
Join Date: Dec 2007
Posts: 6,850
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Quote:
Originally Posted by 94cobra69ss396
I'm only making 10psi which is the same as I was before with the 302. I'm also running the same heads and intake as before and I never had an issue with it blowing intake gaskets. I highly doubt that's the issue but I'll take a look at them when I pull the upper intake off.
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PSI, I know your perception is skewed, but 10 psi is a lot on a street V8. Its not an Evo 
__________________
I <3 forced induction.
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01-26-2014, 07:04 PM
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#33
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Internet Tough Guy
Join Date: Jun 2008
Posts: 1,545
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Quote:
Originally Posted by enkeivette
PSI, I know your perception is skewed, but 10 psi is a lot on a street V8. Its not an Evo |
not really.
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2007 C6 z51 416ci, KW variant III, Wilwood WS6, Traqmate.
2005 F-350 PSD 4x4 DRW Lariat
2013 Mustang GT Grabber Blue, track pack, Brembo, Recaro, 3.73s
2009 Jetta Auto 2.5 liter
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01-27-2014, 09:21 AM
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#34
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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Doesn't really matter as the intake gaskets aren't leaking and I've never had an issue blowing them. When I was cleaning them number 8 injector was the only one that didn't have a nice stream at first. I thought it was going to have an issue only because when I changed the spark plugs a while ago cylinder 8 plug just looked a little lean compared to the others.
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01-27-2014, 03:29 PM
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#35
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Quote:
Originally Posted by 94cobra69ss396
Doesn't really matter as the intake gaskets aren't leaking and I've never had an issue blowing them. When I was cleaning them number 8 injector was the only one that didn't have a nice stream at first. I thought it was going to have an issue only because when I changed the spark plugs a while ago cylinder 8 plug just looked a little lean compared to the others.
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I know on LS motors builders will sometimes specifically compensate flow rate for cylinder 8. I think mine is 35#, while the others are 32#, something like that.
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01-27-2014, 05:29 PM
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#36
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Internet Tough Guy
Join Date: Jun 2008
Posts: 1,545
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One of the PSCA guys that works on base has a turbo SIlverado. I was talking to him about tuning and he stated that when he tunes he uses high temp tape to hold thermocouples on each exhaust primary. The EGT of each cylinder is an indicator on how lean / rich it's running. He then add impedance inline with the fuel injector to balance out the flow.
Formula ford guys use a surface pyrometer and insert baffles into the plenum to balance out EGTs since with the carb motors fuel doesn't flow evenly to all four cylinders.
Get a A/I inventor and catalog that shit. I have one from Traqmate if you want to borrow it.
__________________
2007 C6 z51 416ci, KW variant III, Wilwood WS6, Traqmate.
2005 F-350 PSD 4x4 DRW Lariat
2013 Mustang GT Grabber Blue, track pack, Brembo, Recaro, 3.73s
2009 Jetta Auto 2.5 liter
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02-18-2014, 02:52 PM
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#37
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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I finally have this issue resolved. There were two causes. The first was the wiring harness to the O2 sensors had three wires that the insulation was cracked and bare wires were touching each other and the oil pan. I called Ford to see if they still carried it but they didn't. So I tried Pick-A-Part and lucked out. Usually they only have V6 SN95 cars but this time they had two '94 5.0's so I pulled the better looking harness. The other issue was that the idle stop screw and IAC bleed screw needed to be adjusted. The car now idles at around 950rpms and no longer has the light throttle surge.
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02-18-2014, 03:02 PM
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#38
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Senior Member
Join Date: Jan 2010
Posts: 1,255
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Congrats of finding the issue.
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2006 CTS-V
1993 Trooper
1991 Impulse RS
1988 Trooper II SAS
1986 TrooperII (No Rear)
1988 Impulse (dead)
1983 K20
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02-18-2014, 06:07 PM
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#39
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I, Vettezuki
Join Date: Feb 2006
Posts: 14,754
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Awesome! Electrical related problems are some of the worst.
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02-18-2014, 06:24 PM
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#40
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Fast & Filthy
Join Date: Jun 2008
Posts: 3,840
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Thanks. Back when Steve tuned the car he mentioned that one of the O2 sensors was acting slow. This explains that too.
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