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12-08-2002, 04:29 PM | #1 |
Registered Member
Join Date: Sep 2002
Location: Boston
Posts: 592
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Mixture seems to lean out while cruising but not acceleration/decel and idle
I'm starting to storngly suspect that the o2 sensors are toast. These are fairly new, bosch units that I got in april. When I did my carb conversion, I just ran some power wires down to them and took the signal wire up to a pair of mixture guages.
At idle, they're up in the "orange zone", but the pass side one is always 2 "bars" lower no matter what. After ...oh....5-7 minutes, the guages suddenly bottom out, them bounce back, then bottom out. Almost like theyre fluctuating. Idle continues without problem and the vacuum reads an unsteady 16 hg's, goes up to a solid 20-22 at fast idle (1200). Now when I accelerate, no problem, tons of power, decel, no problem, no backfire. The guages ride in the orange zone during accel, but when I start cruising, they bottom out to zero consistently. They come back to normal when I put in the clutch. The car does seem to...well....cruise a bit choppy, but just a bit. I'm not running egr and it seems as if the crossover in the exhaust came loose again, I'm welding it tonight. I'm running 70/72 jets and 6.5 powervalve, floats dead on and a mechanical fp. An ideas on why this leans out at cruise? Those jets should be plenty enough. Thanks for any carb advice, you crazy racers!
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91 GT Carb conversion, holley 600 double pumper, edelbrock performer intake, FMS "C" drop springs, march 1000 underdrive pullies, crane 1.7 roller rockers, GT-40P headers, bassani x pipe, american thunder catback, FMS 4.56's, msd aL6, trunkmount battery, A/C eliminator kit, 3000 stall tci streetfighter, AOD with transgo kit, A+ servo, 300M hardened lockup shaft, kevlar bands and 28,000 gvw trans cooler, 3 core radiator, 300 lbs stripped with a full interior |
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