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

sorry double post

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!

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

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