Please Help!!!!!!!!

LS WHAT · 09-09-2002, 07:02 PM

Hello all. I This is my first post and I've come to get help on a serious problem. I just got done doing a H/C/I swap on my 88 lx. I ran it for a couple days on speed density then converted over to mass air using ITS harness, A9P used from MPS, and a 75mm bullet. The car breaks up and stutters anything after half throttle. Also the power is way down. Here is some food for thought: new coil, O2 sensors, ACT & ECT sensors, checked MAP sensor, HEGO ground is connected to block as is the other ground strap to the back of the head, 17 degrees of timing, 12 in of HG at idle, 35 lbs of fuel pressure( tried other settings but really didn't affect it), clocked MAF, swapped MAF with a buddies cal'd for 30#'s, got .68 volts between C&D and 12.5 between A&B on MAF. MAF wiring is OK, got code 66(low MAF signal voltage) KOEO, I have a different computer coming to see if it's that. the plugs sre rich but not on top. I'm completely stumped here.

Any ideas would be greatly appreciated.

Thanks, Matt

LS WHAT · 09-09-2002, 07:07 PM

sorry double post

88fivepointoh · 09-09-2002, 07:38 PM

Hi there.. What size injectors are you running and are they matched to your new mass air meter? I would also check to see if all your connections are correct with the harness splice in. have you run any codes? let me know what you have done so far... thanks!

LS WHAT · 09-09-2002, 07:53 PM

I have 30 lb injectors and a 75mm pro-m calibrated for 30 lb injectors. So they are matched. All the connections are good otherwise I probably wouldn't get the correct voltages at A&B and C&D if the connections were bad. The only code I get is code 66( low mass air signal). This is KOEO.

Thanks, Matt

88fivepointoh · 09-09-2002, 10:14 PM

i would venture a guess that something is wrong with your mass air unit. it seems to be running lean..

09-09-2002, 07:02 PM	#1
LS WHAT Registered Member Join Date: Sep 2002 Posts: 4	Please Help!!!!!!!! Hello all. I This is my first post and I've come to get help on a serious problem. I just got done doing a H/C/I swap on my 88 lx. I ran it for a couple days on speed density then converted over to mass air using ITS harness, A9P used from MPS, and a 75mm bullet. The car breaks up and stutters anything after half throttle. Also the power is way down. Here is some food for thought: new coil, O2 sensors, ACT & ECT sensors, checked MAP sensor, HEGO ground is connected to block as is the other ground strap to the back of the head, 17 degrees of timing, 12 in of HG at idle, 35 lbs of fuel pressure( tried other settings but really didn't affect it), clocked MAF, swapped MAF with a buddies cal'd for 30#'s, got .68 volts between C&D and 12.5 between A&B on MAF. MAF wiring is OK, got code 66(low MAF signal voltage) KOEO, I have a different computer coming to see if it's that. the plugs sre rich but not on top. I'm completely stumped here. Any ideas would be greatly appreciated. Thanks, Matt __________________ 1988 mustang lx 5.0 Trick Flow Twisted Wedge Heads, Trick Flow Street Intake, Crower 15511 Cam, Pro-M 75mm bullet, Mass Air Conversion, Mac 70 mm t-body, 30 # injectors, 255lph fuel pump, NOS stage 1, 1.72 Scorpion Rockers, BBK shorties, Mac offroad h-pipe, 2 chamber Flows, AOD w/Transgo shift kit, 3.73's

09-09-2002, 07:07 PM	#2
LS WHAT Registered Member Join Date: Sep 2002 Posts: 4	sorry double post __________________ 1988 mustang lx 5.0 Trick Flow Twisted Wedge Heads, Trick Flow Street Intake, Crower 15511 Cam, Pro-M 75mm bullet, Mass Air Conversion, Mac 70 mm t-body, 30 # injectors, 255lph fuel pump, NOS stage 1, 1.72 Scorpion Rockers, BBK shorties, Mac offroad h-pipe, 2 chamber Flows, AOD w/Transgo shift kit, 3.73's

09-09-2002, 07:53 PM	#4
LS WHAT Registered Member Join Date: Sep 2002 Posts: 4	I have 30 lb injectors and a 75mm pro-m calibrated for 30 lb injectors. So they are matched. All the connections are good otherwise I probably wouldn't get the correct voltages at A&B and C&D if the connections were bad. The only code I get is code 66( low mass air signal). This is KOEO. Thanks, Matt __________________ 1988 mustang lx 5.0 Trick Flow Twisted Wedge Heads, Trick Flow Street Intake, Crower 15511 Cam, Pro-M 75mm bullet, Mass Air Conversion, Mac 70 mm t-body, 30 # injectors, 255lph fuel pump, NOS stage 1, 1.72 Scorpion Rockers, BBK shorties, Mac offroad h-pipe, 2 chamber Flows, AOD w/Transgo shift kit, 3.73's

09-09-2002, 07:38 PM	#3
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	Hi there.. What size injectors are you running and are they matched to your new mass air meter? I would also check to see if all your connections are correct with the harness splice in. have you run any codes? let me know what you have done so far... thanks!

09-09-2002, 10:14 PM	#5
88fivepointoh Registered Member Join Date: Aug 2002 Location: Rochester Posts: 553	i would venture a guess that something is wrong with your mass air unit. it seems to be running lean..