Woah Watch out for my Five-O! September 05, 2008, 12:19:00 AM heh, All kidding aside. Its been a couple weeks since I posted last. Since I bought the mustang a bunch has been put in.I'll just start the listFirst off its an 88 Stang, Speed Density Automatic ConvertibleBBK CAIPerformance Products 70MM TBCobra Upper/LowerHeat/Smog/AC all removedEGR deleted, the sensor I left plugged in the but valve assembly removed and port on the intake was blocked off with a piece of aluminum and gasket makerAdj fuel pressure regulator set at 43psi at the momentStocker 19lbsStock E7s and lower endBBK Shorty unequals/offroad H pipe/Flow40sBBK Underdrive pulleysMSD Cap/RotorStrut brace/Subframe connectors3.73 gearsThe last owner had a shiftkit installed the AOD or so he says.I busted the original TV cable, which sure is a bitch getting a new one, but I got a replacement and its installed, I think I need a slight adjustment yet.Anyhow, Heres the problems. I started throwing a AMP(Battery) light, was on and off here and there at first, its staying around more often now. I've replaced the battery, Voltage regulator, and reinstalled the stock alt pully and the light is still on, before the bat/volt reg I read low to mid 12v at the batt, now I got 13-14v. Ground looks good to the block, cables are good. My last guess is the alternator itself but I'd rather another option. or trick to check something? The alt itself is less than 2 years old and looks pretty new. the other problem, not really a problem but at idle after she warms up a bit she starts to whistle through the TB, pretty loud and high pitched, the car pulls hard and runs awesome, idles great, TPS is at .99, I'm curious as to the vacuum should be though. lines are all good but I got the MAP off the vacuum tree on the firewall, only shared to the brake booster, and one line to the PCV valve, if anyone knows, the cobra intake has a line off just at the TB, I've used that one for the fuel pressure regulator. should I change how this is all hooked up? Oh, And I blow a little oil out the backside of the lower intake, I think my gasket maker didn't seal good, and my pressure sending unit and filter area drip all the time. I've also found a new puddle of coolant but not sure where thats coming from yet.Wow, anyhow thats a really long post but its been a while. I know some 5.0 guru in here has an idea for me. All is apprecitated. Any questions please ask. Quote Selected
Woah Watch out for my Five-O! Reply #1 – September 05, 2008, 01:45:37 AM The voltage regulator has three inputs labeled I, S and AThe Y/W wire on "A" should be hot at all times.The ignition switch in run puts 12volts on one side of the AMP light. The other side of the light is the LG/R wire on the "I". This causes the voltage regulator to energize the field of the alternator, turning it on. The regulator also provides the ground on the LG/R wire to turn on the light.When the alternator starts generating an output there will be a voltage on the W/BK wire from the stator output of the alternator to the "S" of the regulator. This voltage should be 1/2 of the alternator output or about 7 volts.This voltage on the "S" should cause the regulator to open the ground for the light, turning it off. Quote Selected
Woah Watch out for my Five-O! Reply #2 – September 05, 2008, 08:27:14 PM Well, Problem solved, the issue is coming from the harness that plugs into the regulator. $8 later and I still haven't changed it but, I wiggled it for now and at least I know where the problem is. Thanks for the tip, it really helped to figure it all out. Now if only I could figure out why the TB whistles so loud Quote Selected
Woah Watch out for my Five-O! Reply #3 – September 05, 2008, 10:23:23 PM QuoteTPS is at .99Any tps setting between .6 to 1.1v is acceptable. (numbers vary slightly depending on who you ask, but if you aren't throwing a tps code, then you're ok) There is no performance gain from adjusting the tps voltage between .99999v to 1.00000v A voltage of 4.6 to 4.8v is not required to reach WOT... WOT/OL is triggered when the TPS voltage is 2.7v above the base/idle voltage. The ECU checks base voltage EVERY TIME YOU TURN THE CAR ON!For example, If your idle tps voltage is .8v, then you will hit WOT/OL at 3.5v If your idle tps voltage is 1.05v, then you will hit WOT/OL at 3.75v QuoteI blow a little oil out the backside of the lower intake, I think my gasket maker didn't seal good, and my pressure sending unit and filter area drip all the time. I've also found a new puddle of coolant but not sure where thats coming from yet.Fix your leaks. The intake one could affect vacuum if it's bad enough. You should pull about 20" Hg @ idle with a stock cam and E7's. Quote Selected
Woah Watch out for my Five-O! Reply #4 – September 06, 2008, 01:56:35 PM Yeah, I gottta get a vacuum gauge and see.I was just stating my tps for those that usually say "Check yer tps"I'm trying to poop in some gasket maker where the leak is coming from, I dont want to have to pull the lower manifold again. Its just a small blowing leak between the block and manifold, that small valley area at the rear of the block, it blows in there, fills the small valley and then drips down the passenger side of the block along the bellhousing. I just got done cleaning it up down there and pooping the seam up, we'll see how it goes. Does anyone know where I can find a vacuum diagram for a 93 cobra? a lot of shiznit was deleted from the car and only things left are the FPR, Brake booster, and MAP sensor. Quote Selected
Woah Watch out for my Five-O! Reply #5 – September 06, 2008, 02:48:53 PM QuoteI'm trying to poop in some gasket maker where the leak is coming from, I dont want to have to pull the lower manifold again.You'll never get rid of it completely unless you pull the manifold....As far as a vacuum diagram I couldn't find one that said it was "Cobra specific"Hope this one helps. Quote Selected
Woah Watch out for my Five-O! Reply #6 – September 10, 2008, 03:33:14 PM Too much doubt, I solved the oil issue, was a problem with the PCV, I cleaned it all out and put it back in, pooped on a ton of RTV Sealer where the leak was coming from, all gone, haven't seen another drip yet. Quote Selected
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