- Oct 17, 2012
- 16
- 0
- 1
I have a 91 fox with pro comp 210 heads, comp 35-328-8 cam w/ 1.6 rockers(.512) lift, bbk ssi intake w/ 70 mm throttle body and 24lb injectors and am having one hell of a time trying to get this thing to run without throwing codes. The funny thing is when I first installed the cam with the old lifters of which 3-4 collapsed; the motor ran fine and strong but sounded like a sewing machine due to the collapsed lifters. The eec-iv didn't throw any codes at all. Now that I have installed new lifters I cant get the car to run worth a dime and I keep getting code 41 which shows lean passenger side o2 sensor and the check engine light keeps coming on. The engine idles decent but under acceleration it seems to bog and cut out. What could be my problem? I took it to a mechanic who obviously doesn't have anymore knowledge than me and he is saying that the computer isn't able to keep up with my cam. He didn't install a new o2 sensor either. Comp advertises that this cam is good to go with efi computer so I assumed this would mean eec-iv since it is the computer in my car and this is the cam made for it. But one thing in comps advertisement that I haven't asked them the question on yet is that the say it is good for efi computer using 1.7 rockers, however, when I told them my setup they suggested 1.6 rockers due to piston to valve clearance and didn't state anything about computer compatibility issues which is why I don't think there is one since the car ran fine before the installation of the new lifters. I do hear what sounds like a vacuum leak and I am getting either intake or throttle body whistle but when I spray around the intake the idle isn't changing and I cant find a leak. Mechanic said he checked it too and couldn't find and intake leak either. I am lost and almost discouraged due to this being my first auto build ever. Where should I be looking to solve this issue? I did a plug reading and they are showing lean and the exhaust smells super rich. Could a bad 02 sensor be causing all this headache? The car barely failed emissions with hydrocarbons being 354 limit is 220. Should I start there or is there somewhere else I should be looking I am physically tired of working on this thing and not getting results and I am also tired of throwing parts at it also. The car has a new 255lph fuel pump, new coil, new plugs, wires aren't that old and don't even have 1000 miles on them. I am going to stop rambling now. I need help. So much for driving this thing to NMRA Bowling Green this weekend like I have been working all summer long to do grrr!