[SpdBoss]

I've owned many foxbodies but this will be my first sn95 with the 5.0.

there are a couple issues with the car that maybe ya'll can give me some direction on. the things that are done to the car were done by the original owner. the second owner of the car doesn't know any specs about what is done and i'm now the third owner.

ISSUE 1 - the speedometer is way high off. at 55 its showing about 70. so then i get out on the highway and i'm following traffic at what i think is 70, i'm showing 90 on the speedo and i'm turning about 2400rpms (5 spd). Have no idea of weither its had gears installed. The odomoeter also does not work.

ISSUE 2 - its a bad cold starter. when the engine is cold (not at running temp) i have to feather it till it starts to warm up then its fine. The car does have a cam but i dont know specs, dont know if its been tuned ECU wise. I did clean the TB, MAF, IAC, and adjusted the TPS to 1.000v. After the cleaning it seemed to do better but its still not just right. I wouldn't think this car being EFI would have cold start issues a carb'd car with no choke would. I have also adjusted the timing where it needs to be.

any help would be greatly appreciated.

[95project]

Originally Posted by SpdBoss I've owned many foxbodies but this will be my first sn95 with the 5.0. there are a couple issues with the car that maybe ya'll can give me some direction on. the things that are done to the car were done by the original owner. the second owner of the car doesn't know any specs about what is done and i'm now the third owner. ISSUE 1 - the speedometer is way high off. at 55 its showing about 70. so then i get out on the highway and i'm following traffic at what i think is 70, i'm showing 90 on the speedo and i'm turning about 2400rpms (5 spd). Have no idea of weither its had gears installed. The odomoeter also does not work. ISSUE 2 - its a bad cold starter. when the engine is cold (not at running temp) i have to feather it till it starts to warm up then its fine. The car does have a cam but i dont know specs, dont know if its been tuned ECU wise. I did clean the TB, MAF, IAC, and adjusted the TPS to 1.000v. After the cleaning it seemed to do better but its still not just right. I wouldn't think this car being EFI would have cold start issues a carb'd car with no choke would. I have also adjusted the timing where it needs to be. any help would be greatly appreciated.

Sounds like you need a new speedo gear in the transmission to correct your MPH issue. Problem is you will have to figure out what gear you have the rear to be sure you get the right one. There is a way to remove the diff cover and count the teeth to know what gear you have..search around here and you kind find an old post about it.

Cold start issue could very well be in the tune if youve checked all those other things.. When you change the cam in a 94-95, the computer needs to be retuned. The fuel tables have to be set correctly to allow for added duration.

[SpdBoss]

so on these 94-95's is it a mail order chip tune or is it like the mod motors and it has the handheld style?

[95project]

Originally Posted by SpdBoss so on these 94-95's is it a mail order chip tune or is it like the mod motors and it has the handheld style?

Chips..no programmers with these.

SCT make a nice piggy back system that you can load multiple tunes on. You should be able to buy a tune for it off line, or order a chip pre burned.

I have a Moates Quarter Horse. Its a piggy back piece that hooks into your ECU. You get software (Binary Editor) and can tune it yourself if you have the know how. Several people can work remotely on these as well (Pops Racing, Adam Marrer did mine) The 94-95 ECU's act crazy when you add a cam with more duration...

[mcglsr2]

Another way to figure out if you have a rear end gear in it is pick an RPM, say 2000, have a friend follow you, tell you how fast you are going (ignore your speedo), to go to a site this this: http://www.f-body.org/gears/,
enter in your tire size, T5 gear ratios, and then start picking common rear end gears, putting that in the axle ratio box, and seeing what MPH/RPM you get. When you put in a rear gear that gives you about the same MPH per RPM as what you and your friend measured, most likely that's the gear you have. Not as accurate as counting the teeth on the ring gear of course, but at least you don't have to take anything apart to get an idea. While taking the rear diff cover off is easy, you will have to refill it with fluid, so if you aren't ready for that, this other method might get you pointed in the right direction.

[warrior86]

when it comes to the odometer not working, there is a plastic gear in the cluster that pretty much breaks/melts at some point and stops the trip and odometer from working.

[ReverendDexter]

So, with stock 245/45R17s and stock T5 5th gear, here's your rpm's at 60mph.

2.73s - 1500
3.08s - 1700
3.27s - 1800
3.55s - 1950
3.73s - 2050
4.10s - 2250

To correct the speedo on a 5.0 SN95, you're going to need to get the right speedo gear; a chip or tuner won't help you.

Based on what you're saying, going 55 reads 70, you've got the gear in the tranny for a lower gear. Doing the math, you could have a speedo gear for 3.55s and actually have 2.73s, a speedo gear for 3.90s and actually have 3.08s, or a speedo gear for 4.10s and actually have 3.27s. I'm fudging the numbers a bit to make some of that math work, as I'm assuming that the input numbers aren't super-precise.

[ReverendDexter]

Argh - having posting issues, but I think I did that backwards.... If you're reading 70 but only doing 55, you have lower gears in the diff than your speedo gear is set for. Flip my numbers around.

[97S281]

Get one of these to fix the odometer:

1994-98 Mustang Odometer Gear Repair Kit by Odometer Gears at LRS - Same Day Shipping!

You can also order the appropriate speedo gear for your transmission from lrs as well.

http://www.latemodelrestoration.com/...0speedo%20gear

[SpdBoss]

My rear tires r 315-35-17.

Gonna buy that gear for odometer and once i find out the rear end gears ill get the right one to correct my speedo.

Thanks guys, yall have been a trimendous help!

[Clockman]

One way to fiqure out you rearend gears is to mark both drive shaft and rear wheel spin rear wheel (up on jack Stands) one revolution and count how many times the drive shaft spins it works like a champ

[SpdBoss]

But wont that give me a false figure depending on size of wheel? In other words, a mark on a 16" wheel will give a diferent reading from a mark on a 17"? Or is there a certain spot to mark on the wheel?


EDIT- nevermind, haha one revolution is one revolution, not talking distance traveled. Ill try that tmro and see what i come up with.

[1SICK5.0VERT]

hey spdboss, so how do you like the sn-95 compared to the foxbody? since youve had a few foxbodys like myself, i was just curious which one you would prefer as a daily driver for the summer. what are your pros and cons? sorry to get off the subject but like i said im just curious on what you think. thanks

[SpdBoss]

Well my love has always been for the foxbody. Ive also owned an 03gt as well and ive just come to like the streamline curved body of the one i currently have. The interior also flows alot better in these cars as far as curves and not just straight lines and 90* corners. I wemt with this one because of these reasons and i went with this sn95 model group for the 5.0. Just never cared much for the mod motors. Im always a budget builder with them all and the mod motors are not really budget friendly when trying to accomplish what i want to do with the car. I also like that this style is 5 lugged compared to the 4 on the fox. No other reason then personal preference and wheels are more easily found used. So all in all the 94-95 models have all the pros i want without having to get into doing swapes between years or styles.

[1SICK5.0VERT]

Originally Posted by SpdBoss Well my love has always been for the foxbody. Ive also owned an 03gt as well and ive just come to like the streamline curved body of the one i currently have. The interior also flows alot better in these cars as far as curves and not just straight lines and 90* corners. I wemt with this one because of these reasons and i went with this sn95 model group for the 5.0. Just never cared much for the mod motors. Im always a budget builder with them all and the mod motors are not really budget friendly when trying to accomplish what i want to do with the car. I also like that this style is 5 lugged compared to the 4 on the fox. No other reason then personal preference and wheels are more easily found used. So all in all the 94-95 models have all the pros i want without having to get into doing swapes between years or styles.

i totally agree.i also had a "99" as well but i will always have a soft spot in my heart for the foxbody's i actually still have an 89 gt convertible with a 5 speed but it needs a ton of work (project car)

[SpdBoss]

Ok can someone explain the IAC to me cause with it UNHOOKED it starts, and idles better then when its hooked up haha.

[ryanw]

try cleaning it

[SpdBoss]

Cleaned the old one, no change. Installed a new one, some change but still not right.

Maybe ill just have to break down and get a chip for it. The cam and having a stock ecu may be my whole problem.

Ok thinking about it more, if it was a pcm or iac or something like that, wouldnt it do it no matter if the engine was cold or at operating temp? Its just weird that the ONLY time there is an issue is when the engine has cooled all the way down. Once its warm, i can shut it off and start it back up no problem at all.

[ryanw]

not necessarily, im thinking that certain sensors kick in depending if its hot or cold, so those vairables need to be taken into acount

[furreal302]

check for a vacuum leak downstream of the MAF. I had some idle problems and I found out that the rubber grommet on the IAT sensor was torn up.