Installed fast 90 90 setup, have a few problems now :(
12-26-2010, 09:30 PM
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Installed fast 90 90 setup, have a few problems now :( FIXED! lol
2001 corvette auto, stock motor with intake/full exhaust and a tune. havent had it tuned for the 90-90 yet
things i changed since the LS6 intake-
Fast 90mm intake and 90mm TB, also put my stock fuel rail with 28# injectors (used to be on my trans am) no fuel leaks anywhere
#1 The car is idling like it has a cam in it, rather rough, but when i rev it, its plenty responsive. definately more responsive than before
#2 wideband is pegged at 16.0 afr at idle. before it was at 14.7
codes- P0300 Random/multiple cyl misfire
i used the special panhead bolts on the valley cover, i torqued the intake down properly with the whole tightening/tq sequence.
i rtv'd my map sensor.
all vaccum lines are on. -HVAC, Power brake booster line, pcv line and that evap line up front.
here's a short clip of the idle. hopefully this link works. what do you all think?
2001 corvette auto, stock motor with intake/full exhaust and a tune. havent had it tuned for the 90-90 yet
things i changed since the LS6 intake-
Fast 90mm intake and 90mm TB, also put my stock fuel rail with 28# injectors (used to be on my trans am) no fuel leaks anywhere
#1 The car is idling like it has a cam in it, rather rough, but when i rev it, its plenty responsive. definately more responsive than before
#2 wideband is pegged at 16.0 afr at idle. before it was at 14.7
codes- P0300 Random/multiple cyl misfire
i used the special panhead bolts on the valley cover, i torqued the intake down properly with the whole tightening/tq sequence.
i rtv'd my map sensor.
all vaccum lines are on. -HVAC, Power brake booster line, pcv line and that evap line up front.
here's a short clip of the idle. hopefully this link works. what do you all think?
Last edited by 98TADRIVER; 01-04-2011 at 12:03 PM.
12-26-2010, 09:46 PM
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I have had that issue with using injectors that have been sitting awhile. They need to be cleaned. Since it runs you might get buy with going and getting a bottle of Chevron Techron injector cleaner and put it in the tank and drive around. On some I have taken the injector rail off and pressureized the rail with cleaner and had to tap on each injector with a screw driver handle to make them spray. I have a Snap-on injector testor to individually fire each injector. Almost a must if the injectors are that dirty. Try the cleaner in the tank first. I have cured them from that before.
12-26-2010, 11:59 PM
#5
This might sound odd, but did you use the FAST stainless allen-headed intake bolts instead of the stock hex intake bolts? I initially used the stainless allen bolts, but developed a vacuum leak. Chased it down and couldn't find the culprit, but a friend suggested switching back to the stock intake bolts.
I did, and problem solved. Obviously the above doesn't apply if you used the stock intake bolts to begin with...
I did, and problem solved. Obviously the above doesn't apply if you used the stock intake bolts to begin with...
12-27-2010, 01:43 AM
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thanks for all the input fellas, i greatly appreciate all of it. Ill go over everything again tomorrow. i need to get some carb/tb cleaner, im all out. And theres a blizzard going on up here in nj, so im not sure when ill be driving in it for a can of that stuff lol
Squirts11- im using the stock intake manifold bolts. tightened them in sequence and torqued them to 44in lbs first pass, then 89in lbs on the final pass. i
Squirts11- im using the stock intake manifold bolts. tightened them in sequence and torqued them to 44in lbs first pass, then 89in lbs on the final pass. i
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12-27-2010, 03:51 PM
#10
In closed loop shouldn't the computer be pulling fuel out to maintain 14.7:1 despite the injectors being larger and the computer no knowing it. If anything I could see it running rich not lean.
I could see it go either way.
x2 on the vacuum leak, I think that's why it's at 16:1
I could see it go either way.
x2 on the vacuum leak, I think that's why it's at 16:1
12-30-2010, 03:34 PM
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figured it out today 
sprayed some carb cleaner where i thought the problem might be.
change in idle was noticeable.
apparently, rtv gasket maker isnt a good substitute for the O ring gasket.. i went down the street to the local machine shop and lucky me, he had exactly what i needed! put it back together, fired her up and what do ya know, smooth idle and runs even better!! thanks for all the troubleshooting help fellas! No retune yet. however, driveability is fine and the afr is at 14.7-15.0@ part throttle and cruise, and 12.6-12.7:1 @ WOT. Should have it re tuned on sunday
sprayed some carb cleaner where i thought the problem might be.change in idle was noticeable.
apparently, rtv gasket maker isnt a good substitute for the O ring gasket.. i went down the street to the local machine shop and lucky me, he had exactly what i needed! put it back together, fired her up and what do ya know, smooth idle and runs even better!!
thanks for all the troubleshooting help fellas! No retune yet. however, driveability is fine and the afr is at 14.7-15.0@ part throttle and cruise, and 12.6-12.7:1 @ WOT. Should have it re tuned on sunday 
12-31-2010, 10:44 AM
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I RTV'd it between the intake manifold and TB. I wouldnt recommend it, as the seal was not good enough. The the new gasket i used looked like a regular rubber O-ring and works great
01-02-2011, 08:43 AM
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01-04-2011, 12:05 PM
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Me 2!! lol
i was told that the TB is a nickwilliams ported, and the intake manifold is unported.
cant wait til' theres a track rental or the new season begins. whichever comes first lol