Help please!!! I have a 91Z28 350, flowmaster exhaust, tes headers, crane hi-6s ignition and boost retard, Paxton S/C running 8lbs of boost, Ford 24lb SVO injectors, and comp cams 1.6 roller rockers. My car just started running like crap, high idle = 1500-1700rpms caughing and droping rpms down to 800, then back up to 1500 area. Changed the iac no change in how the car runs. No vacume leaks...solid 20in of vacume. When i get on the throttle at all a bunch of black soupy crap comes out of the tail pipe. Im runnig 41psi and have a 8/1 FMU. I dropped my fuel pressure from 52psi to 41 today and i still get the black crap out of the tail pipes?? I do not even get into the boost and the black stuff is a commin. I have no idea why i am running so rich????? I have not have had any sort of problem untill 3days ago???
PLEASE HELP

CRAIGER

 

One more thing... I am not throwing any codes???

craiger

 

MAybe your ECM has craped out on you in some of its functions. Other than idle how does it drive? Thats the only thing I can think of that would read real lean to add enough fuel to make you that rich without throwing a code. Don't depend on you ECM to through a code to tell you its bad though.

------------------
FOR SALE!!!!!!!!!!!!!!!
86 Trans Am 355 TPI Rebuilt 700R4 with Corvette servo, modified valve body, and a B&M Torque Converter (2000 rpm stall w/ lock up), 87 350 block bored .30 with new crank. Reworked 305 heads with 3-angle valve job. Added in the rebuild was an SLP TPI cam, BBK 58mm Throttle Body,MSD 6A, Hypertech Power Coil,MSD Wires, 1.5 Crane roller tipped rocker arms, SLP Intake Runners and Port matching in upper intake including fully ported plenum, TPIS adjustable fuel pressure regulator @ 46psi, Hooker shorty style headers w/ Thermotech heat wrapping, Custom 3” exhaust with Flowmaster muffler and chrome quad tips, Hypertech Thermomaster Computer chip, K&N open element cone filter on modified MAF per TPIS specs, removal of A/C hardware and added a 1LE firewall cover installed. Also there has been a PST front suspension kit with Hotchkis strut tower brace added.
Stereo has 2 Clairion Pro Audio dash plates, 2 Sony 6X9s, 2 Kicker 12's in a custom Carpeted box with a custom amp rack Holding 3 MTX 280 Amps, and a MTX electronic Crossover all wired with EFX cable.
Asking $4200 with all extra Parts that are needed to fix most apearance flaws. ie Complete hatch and wing from a 91 GTA
http://geocities.com/feltsb/kyle.html
Kills:
95 Talon TSI, 96 Probe GT, 91 T/A L98, 89 RS, 86 Mustang GT, 88 Mustang LX 5.0, 92 Thunderbird V8. couple or ricers that I think were Civics or Preludes not sure what year, 95 Celica GT-S, 94 Chevy 1/2 ton 350, one of those NASCAR F150's

The Third Gen Will Never be Forgotten

 

Mine started doing that and I changed the plugs and plug wires. Fine now!

[This message has been edited by 72LT1VETTE (edited March 31, 2001).]

 

Possibly the extra psi from the fmu popped the press reg and it pumping raw gas through the vacuum line?