venom
07-22-2012, 06:51 PM
So I'm having major issues with my car. Here is a little history;
93 cobra
AL9 ECM with SCT chip
Vortech S-trim
TFS heads, cam, intake
42# injectors
Pro-M 80mm MAF
I had this setup dyno'd in 2005 and the car ran great until I tore it down for a repaint. (2 years ago)
Fast-forward to 2011. Car was back up and running, but just didn't feel right. I limped it around all summer. Swapped out coolant temperature sensor in the fall, and the car felt much better, but still not 100%.
Two weeks ago I decided to dig into the car a little more and pulled the plugs. 7 plugs were lean and 1 was brand new. Hmm.
After swapping an injector and sparkplug wire at #4 cylinder, Vital brought over a spare ECM. Tossed that in, and the car was back! I came home yanked the old sparkplug wire off, but didnt hook the s/c bypass valve vacuum line back on. Went down the road and noticed a blue smoke screen. Ooops. Came back, plugged line in, then the car started running SUPER rich. Like top-fuel rich. Vital thought I was exaggerating when I said the fuel was pouring out the tailpipes. He came over and freaked out. Fuel is just pouring out at every flange, anywhere it can get out.
So WTF would make the car run that rich during open loop? O2 sensors shouldnt be giving any feedback to the ECM. Even so, I had new ones that I just put in today. That didnt help. The adjustable fuel regulator doesnt seem to be bad (pulled vacuum line off to see if fuel sprayed out), but I didnt check the fuel pressure yet.
Damn Fords!
93 cobra
AL9 ECM with SCT chip
Vortech S-trim
TFS heads, cam, intake
42# injectors
Pro-M 80mm MAF
I had this setup dyno'd in 2005 and the car ran great until I tore it down for a repaint. (2 years ago)
Fast-forward to 2011. Car was back up and running, but just didn't feel right. I limped it around all summer. Swapped out coolant temperature sensor in the fall, and the car felt much better, but still not 100%.
Two weeks ago I decided to dig into the car a little more and pulled the plugs. 7 plugs were lean and 1 was brand new. Hmm.
After swapping an injector and sparkplug wire at #4 cylinder, Vital brought over a spare ECM. Tossed that in, and the car was back! I came home yanked the old sparkplug wire off, but didnt hook the s/c bypass valve vacuum line back on. Went down the road and noticed a blue smoke screen. Ooops. Came back, plugged line in, then the car started running SUPER rich. Like top-fuel rich. Vital thought I was exaggerating when I said the fuel was pouring out the tailpipes. He came over and freaked out. Fuel is just pouring out at every flange, anywhere it can get out.
So WTF would make the car run that rich during open loop? O2 sensors shouldnt be giving any feedback to the ECM. Even so, I had new ones that I just put in today. That didnt help. The adjustable fuel regulator doesnt seem to be bad (pulled vacuum line off to see if fuel sprayed out), but I didnt check the fuel pressure yet.
Damn Fords!