Explorer intake on modded '87 5.0 SO? February 25, 2009, 01:32:12 AM My engine tends to run a little rich and idles rough, so I'm wondering if moving to an Explorer intake might help matters a bit. Currently I have the following:19# injectors65mm TB + EGR spacerAFPRaftermarket cam (don't know what...maybe '86 HO cam?)Stock 5.0 upper ground out to match TB inner diameterI don't think I should need one, but who knows what the inside of my upper intake looks like, I figure it can't be flowing nearly as well as one made for the TB would. My mechanic neighbor is playing with it, he thinks there's a vacuum leak somewhere (which would make it run rich anyway) so the first order of business is to nail that down, but I figure it doesn't hurt to ask in case that doesn't resolve the problem. Everything else is stock (heads, lower intake, exhaust, etc.). Plugs, cap, rotor, coil are all new, 9mm wires are in good shape, etc. Quote Selected
Explorer intake on modded '87 5.0 SO? Reply #1 – February 25, 2009, 01:42:10 AM Are you sure that it isn't the 19# injectors with a stock SO computer? Stock injectors on a SO motor are 14#'s and this would make a difference. Maybe if you were using the 5.0 HO speed density mustang computer.....Plus with a cam that you have no idea what it is. What firing order does the camshaft have? there is a difference between the HO and the SO cams. If you have all the HO stuff on the motor, try an HO speed density computer. That may fix all the issues.If it was running fine for years with this combination and then all the sudden now it's running like , check for vacuum leaks, if none are found, check the fuel pressure, check for codes, check the MAP sensor, check the computer....kinda in that order.Hope this helps Quote Selected
Explorer intake on modded '87 5.0 SO? Reply #2 – February 25, 2009, 09:08:29 AM If you do decide to go with an Explorer intake, I happen to have one laying around that I'd like to get rid of...and you know I offer installation services...lol.Good luck,Don Quote Selected
Explorer intake on modded '87 5.0 SO? Reply #3 – February 25, 2009, 11:46:33 AM The intake will not cause a rough idle, and isn't going to cause a rich condition at cruse... If you had good aftermarket heads, exahust etc, maybe could cause a rich condition at WOT... Quote Selected
Explorer intake on modded '87 5.0 SO? Reply #4 – February 25, 2009, 08:06:09 PM Does the cam you are running have a 1-3-7-2-6-5-4-8 firing order? If so it has a HO/351 firing order and is causing a twofold problem with the stock T-bird SO EEC:1. The injectors are firing at the wrong time as they are set to fire to the SO cam's 1-5-4-2-6-3-7-8 firing order.2. The SO computer can't handle the 19 lb/hr injectors so the car is running rich.I bet if you change to a HO SD computer from a 87-88 Mustang or 87-92 Mark VII I bet that your problems will go away Quote Selected
Explorer intake on modded '87 5.0 SO? Reply #5 – February 26, 2009, 10:43:14 PM I don't know about the firing order, but would the car even run if the injectors were firing at the wrong time? When the RPM's get up to 900 or so everything smooths out and the car runs fine. Quote Selected
Explorer intake on modded '87 5.0 SO? Reply #6 – February 27, 2009, 01:36:01 AM Quote from: Quietleaf;258773I don't know about the firing order, but would the car even run if the injectors were firing at the wrong time? When the RPM's get up to 900 or so everything smooths out and the car runs fine.It'll run but it will idle funky and run py at high rpms. Are you running 19s with the stock T-bird computer? If so that is what's causing the rich condition. Quote Selected
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