Tuning the computer?

03-02-2002, 04:45 PM

Well i just found out that the guy i bought my 95 GT had the computer "tuned" for a richer mixture so he could make some later mods (that he never did) to turn this car into a Saleen. This explains my Missfire at idle and the VERY black tail pipes. What im wondering is is there a way to tune the computer or does a person have to have a chip burned. Im assuming theres a burned chip in it. If thats the case were can i get a stock chip so i can get my mileage back until i have the money to do some mods to this car. Or is there a way to tune the computer with a scanner or PC? I know hypertech doesnt make a scanner for 95s. Would it be cheaper for me to just go ahead and make the mods (headers, exhaust etc) to lean out this rich mix?

gtsr515 · 03-02-2002, 06:54 PM

Well, the only way the former mentioned could have "tuned" the computer is as you mentioned, with a chip or piggyback unit, the only way to de-tune it is remove the custom chip. I'm pretty sure that if it was tuned with a piggyback unit the second that unit was removed and the car restarted, that info would no longer effect the car. Disconnect the battery overnight and see what it feels like after that.

03-02-2002, 11:21 PM

The engine computer is located behind the right hand kick panel right? If it is i looked at it and theres no piggyback chip such as a jet chip or anything like that on there. Only thing i could figure is that the guy put a saleen comp in there. If its not the computer than what could be causing the rich mix. There are no codes in the computer i checked it with a scanner. I have no idea what the fuel pressure is ill have to check it. Could the o2 sensor(s) be messed up or would it set a code if it was?

gtsr515 · 03-02-2002, 11:34 PM

Yes, the 02's could be "out of range" which is FORDspeak for bad, but, they would 100% code bad if they were. I'm with ya bud, waiting.........

DRASTiK · 03-03-2002, 01:56 AM

This is just a thought, but what MAF is in your car? If he put a MAF or tube in it that is calibrated for different size injectors than you currently have, it would make it run kinda screwy.

Capri306 · 03-03-2002, 11:31 AM

That's a good point, D&R Stang, especially if he has the stock MAF and bigger-than-stock injectors.

03-04-2002, 05:21 PM

The MAF looks stock but i have no clue as what to look for in differences between stock GT and Saleen. Does the saleen MAF use a huge black covering around it? The injectors are stock. They have the Yellow tops on them. Im going to call a shop today that can tune computers and see what they charge. If its more than upgrading the ignition system ill do that. Anyone ever heard of/used Performance distributor's Screamin Deamon coil, Dynamod, livewires? I figure ill get some more spark and burn all the extra fuel and get a few more ponies too.

MiracleMax · 03-04-2002, 10:40 PM

Run the dog pee out of a 5.0 and the pipes will be black anyway. A bigger spark won't burn more fuel (you'll need more air for that). My fox car had a slight mis-fire at idle, I would tune up the ignition and it would go away for about a day and be right back.

I don't think the old EEC-IV's could be flash programed? So it seems odd to me unless he put a chip.If you've got no chip, injectors or mass-air and everything is bone stock, then I think its hip wadder time on that.

03-08-2002, 04:19 PM

well as it turns out the thing is running lean and not rich. Fuel pressure test shows that with the key on engine off 20 psi (supposed to be 35-45 psi) and key on engine running shows 30 (supposed to be 30-45 psi) my auto teacher thinks that the lean condition could be caused by an exhaust leak thats letting air get to the O2 sensor. This doesnt make sense to me because i would figure the computer would richin the mixture, right? I put the car on a 5 gas emission tester and it showed an O2 reading of like 9.04 and Co2 reading of 8.01. There are no codes in the computer on either KOEO or KOER. any suggestions?

03-02-2002, 04:45 PM	#1
Mustang Cain Guest Posts: n/a	Tuning the computer? Well i just found out that the guy i bought my 95 GT had the computer "tuned" for a richer mixture so he could make some later mods (that he never did) to turn this car into a Saleen. This explains my Missfire at idle and the VERY black tail pipes. What im wondering is is there a way to tune the computer or does a person have to have a chip burned. Im assuming theres a burned chip in it. If thats the case were can i get a stock chip so i can get my mileage back until i have the money to do some mods to this car. Or is there a way to tune the computer with a scanner or PC? I know hypertech doesnt make a scanner for 95s. Would it be cheaper for me to just go ahead and make the mods (headers, exhaust etc) to lean out this rich mix?

03-02-2002, 06:54 PM	#2
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	Well, the only way the former mentioned could have "tuned" the computer is as you mentioned, with a chip or piggyback unit, the only way to de-tune it is remove the custom chip. I'm pretty sure that if it was tuned with a piggyback unit the second that unit was removed and the car restarted, that info would no longer effect the car. Disconnect the battery overnight and see what it feels like after that. __________________ Remember...2nd place is 1st place for losers!

03-02-2002, 11:34 PM	#4
gtsr515 Registered Member Join Date: Nov 2001 Location: Sunny, Hot, Sebring, Florida Posts: 725	Yes, the 02's could be "out of range" which is FORDspeak for bad, but, they would 100% code bad if they were. I'm with ya bud, waiting......... __________________ Remember...2nd place is 1st place for losers!

03-03-2002, 11:31 AM	#6
Capri306 Moderator Join Date: Sep 1998 Location: Grand Rapids, Michigan, USA Posts: 1,001	That's a good point, D&R Stang, especially if he has the stock MAF and bigger-than-stock injectors. __________________ Capri306, Moderator The Mustang Works Online 1979 Mercury Capri 1987 5.0L Mustang LX Notchback 1993 5.8L Eddie Bauer Bronco

03-04-2002, 10:40 PM	#8
MiracleMax Registered Member Join Date: Apr 1999 Location: Hayes, Va, USA Posts: 798	Run the dog pee out of a 5.0 and the pipes will be black anyway. A bigger spark won't burn more fuel (you'll need more air for that). My fox car had a slight mis-fire at idle, I would tune up the ignition and it would go away for about a day and be right back. I don't think the old EEC-IV's could be flash programed? So it seems odd to me unless he put a chip.If you've got no chip, injectors or mass-air and everything is bone stock, then I think its hip wadder time on that. __________________ 2002 5M GT (99% stock) 1991 5M LX (30% stock) patiently awaiting my satin silver 07 Mach 1, and don't forget the shaker

03-02-2002, 11:21 PM	#3
Mustang Cain Guest Posts: n/a	The engine computer is located behind the right hand kick panel right? If it is i looked at it and theres no piggyback chip such as a jet chip or anything like that on there. Only thing i could figure is that the guy put a saleen comp in there. If its not the computer than what could be causing the rich mix. There are no codes in the computer i checked it with a scanner. I have no idea what the fuel pressure is ill have to check it. Could the o2 sensor(s) be messed up or would it set a code if it was?

03-03-2002, 01:56 AM	#5
DRASTiK Registered Member Join Date: May 2001 Location: Yuma, AZ Posts: 536	This is just a thought, but what MAF is in your car? If he put a MAF or tube in it that is calibrated for different size injectors than you currently have, it would make it run kinda screwy.

03-04-2002, 05:21 PM	#7
Mustang Cain Guest Posts: n/a	The MAF looks stock but i have no clue as what to look for in differences between stock GT and Saleen. Does the saleen MAF use a huge black covering around it? The injectors are stock. They have the Yellow tops on them. Im going to call a shop today that can tune computers and see what they charge. If its more than upgrading the ignition system ill do that. Anyone ever heard of/used Performance distributor's Screamin Deamon coil, Dynamod, livewires? I figure ill get some more spark and burn all the extra fuel and get a few more ponies too.

03-08-2002, 04:19 PM	#9
Mustang Cain Guest Posts: n/a	well as it turns out the thing is running lean and not rich. Fuel pressure test shows that with the key on engine off 20 psi (supposed to be 35-45 psi) and key on engine running shows 30 (supposed to be 30-45 psi) my auto teacher thinks that the lean condition could be caused by an exhaust leak thats letting air get to the O2 sensor. This doesnt make sense to me because i would figure the computer would richin the mixture, right? I put the car on a 5 gas emission tester and it showed an O2 reading of like 9.04 and Co2 reading of 8.01. There are no codes in the computer on either KOEO or KOER. any suggestions?

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