Leeiswho2b

88 GT vert. Getting ready to do H/C/I or carb, haven't decided yet. I went w/ mass airflow with the last SD I had built, but could never get it running quite right. Was always running extremely rich and had idling probs. WOT was amazing, but besides that it was an aggravation. It had all the bolt ons. Anyways thought about trying to build this w/ sd. Has anyone tried using a vacuum pump to offset the lack of? Just trying to find a way to trick the map sensor. (From what I understand that's what the real prob is w/ sd, but then I have been wrong many times!) Just don't want to go through the probs I had with the last. That's wht I was thinking about just going w/ a carb setup.

Last5.0

1988 LX T-tops 98k on clock....<5k on build

Mods:

306
Trickflow upper and lower intake
B303 Cam
Eldebrock RMS Aluminum heads
TRW forged pistons
1.7 roller rockers
C&L 76mm MAF
Trickflow 70mm TB
Holley adjustable fuel pressure regulator
24# injectors
Cervini's functioning RAM AIR kit
MSD distributor
MSD 6AL ignition
MSD Masterblaster coil
MSD 8.8 wires
Electric fan setup
A/C and smog delete
underdrive pullies
190 lph fuel pump
3 core aluminum radiator
Pete Jackson gear drive
Trickflow Aluminum valve covers
BBK Shorty headers
Off road H pipe
40 series flows
Ford racing clutch
B&M short throw shifter
8.8 Rear 3.73 gears
Tremac 5 speed

The fun and expense of starting over again!!!!!!!! Sux!!!!!!

mattdel

yah its related to the MAP, because alot of aftermarket cams create much less vacuum then stock, it screws it all up. it must be tuned professionally, or if you got the grapes to try it yourself, buy a Tweecer.

AdderMk2

"tricking" the map sensor isnt really all that hard, You can use a restriction in the hose that runs to the MAP to smooth out the "pulses" that a long duration cam would make, you can also use a small carb fuel filter in the line to help dampen the pulses... HOWEVER, If you wanna stick with speed density, I would recommend a system like Megasquirt.

I'll be running it in my car if I ever get around to building my interconnect harness

Leeiswho2b

Would rather go with maf, but just don't want the headaches of the last time around. Thought about putting it up for trade for a 90-93 b/c of it.

mattdel

converting to MAF is easy, and should just work right away. your problems last time are an easy find for techs, an hours diag time woulda found your problem. not to mention a plethera of people here including me could help you along the way.

Leeiswho2b

Had the last one scanned several times by a ASE Master tech that taught for a local school, never threw out any codes.

mattdel

IAC's don't throw codes half the time. IAC won't make it run rich though. hard to say without more info on its behavior. convert it MAF again man, i'll guarantee you, it will run right.