Idling Problems

Jesussoldier · May 28th, 2008, 03:37 AM

Hey guys I have a 02 Mustang GT, and the other day I was jump starting another car, with some jumper cables, so I connected everything correctly and the other car started, but then when I disconnected the cable from the other car I accidentally made contact with both cables, and sparks flew. In other word I made a short. All of this happened while the mustang was still connected and the car being on. Then all off the sudden I heard that my car was sounding louder than usual like if I was hitting the gas, but I wasn't. I looked at the RMP gauge and it was at 1 RPM instead of it being at the half RPM that it's suppose to be at when parked. Why is it idling weird? plz help What did I do? Did I mess up the computer?

01GTstang · May 28th, 2008, 03:59 AM

is your check engine light on?

SteviGX · May 28th, 2008, 09:31 AM

may have fried a circuit. have the alternator checked, i've seen an arched battery burn the shit out of the alternator

Jesussoldier · May 28th, 2008, 03:49 PM

Originally Posted by 01GTstang

is your check engine light on?

No check engine like.

Jesussoldier · May 28th, 2008, 03:51 PM

Originally Posted by SteviGX

may have fried a circuit. have the alternator checked, i've seen an arched battery burn the shit out of the alternator

Will do that thanks...Also do you know if maybe that might have affected the computer?

Jesussoldier · May 29th, 2008, 03:14 AM

I have another question, could I have damaged my TPS sensor?

01GTstang · May 29th, 2008, 03:27 AM

i was talkin to a friend of mine last night about that and he said that it could have messed up your tps

SteviGX · May 29th, 2008, 09:06 AM

there's all types of shit you could have fried. but if it's any sensor it should throw a code. tps wouldn't have to do with idle...check your IACV and clean that and check vacuum lines just in case

cliffyk · May 29th, 2008, 09:55 AM

Disconnect the battery for 5-7 minutes, the EMI/RFI glitch from the short could have scrambled the KAM (Keep Alive Memory] where all learned parameters (such as idle air trim, short and long term fuel trims, etc.) are stored. Disconnecting the battery for 5 minutes or more resets this memory and forces the PCM to relearn these values.

The TPS has no active electronics (it's just a potentiometer) and is only connected to the PCM and ground. It is highly unlikely that shorting the battery damaged the TPS without taking out the PCM too. Same is true for the IAC.

In the last--when using jumper cables; connect both positive cables first then both grounds (battery to be jumped last). In this way there is no common ground between the vehicles until the last ground is connected...

When disconnecting do the both grounds first, then the positives. This removes the common ground first. It would also have prevented your faux pas...

Trick Tuners · May 29th, 2008, 04:47 PM

I wouldn't worry. Many times the car will set a high idle just after the ECU is reset (dead battery). Give it a day or 2 and it should go away.

May 28th, 2008, 03:37 AM	#1
Jesussoldier Newbie Join Date: May 2008 Posts: 7 iTrader: 0 reviews	Idling Problems Hey guys I have a 02 Mustang GT, and the other day I was jump starting another car, with some jumper cables, so I connected everything correctly and the other car started, but then when I disconnected the cable from the other car I accidentally made contact with both cables, and sparks flew. In other word I made a short. All of this happened while the mustang was still connected and the car being on. Then all off the sudden I heard that my car was sounding louder than usual like if I was hitting the gas, but I wasn't. I looked at the RMP gauge and it was at 1 RPM instead of it being at the half RPM that it's suppose to be at when parked. Why is it idling weird? plz help What did I do? Did I mess up the computer?

May 28th, 2008, 03:59 AM	#2
01GTstang Regular 2001 MustangGT 2003 Cobra GT-13.079 @ 104.69 Cobra-12.60 @ 111.11 Join Date: Nov 2007 Location: Richmond, VA Posts: 344 iTrader: 0 reviews	is your check engine light on? __________________ 2001 GT: For Sale, low 13s 2003 COBRA: 12.11@116

May 28th, 2008, 09:31 AM	#3
SteviGX Hardcore Enthusiast 2002 Mustang GT 13.538@101.72 before cams&slicks&gears Join Date: May 2007 Location: Indianapolis Posts: 1,545 iTrader: 2 reviews	may have fried a circuit. have the alternator checked, i've seen an arched battery burn the shit out of the alternator __________________ Mineral Gray Club Member #2 Just your average 22 year old dumbass If you didn't build your car, and your bragging about it, STFU

May 29th, 2008, 03:27 AM	#7
01GTstang Regular 2001 MustangGT 2003 Cobra GT-13.079 @ 104.69 Cobra-12.60 @ 111.11 Join Date: Nov 2007 Location: Richmond, VA Posts: 344 iTrader: 0 reviews	i was talkin to a friend of mine last night about that and he said that it could have messed up your tps __________________ 2001 GT: For Sale, low 13s 2003 COBRA: 12.11@116

May 29th, 2008, 09:06 AM	#8
SteviGX Hardcore Enthusiast 2002 Mustang GT 13.538@101.72 before cams&slicks&gears Join Date: May 2007 Location: Indianapolis Posts: 1,545 iTrader: 2 reviews	there's all types of shit you could have fried. but if it's any sensor it should throw a code. tps wouldn't have to do with idle...check your IACV and clean that and check vacuum lines just in case __________________ Mineral Gray Club Member #2 Just your average 22 year old dumbass If you didn't build your car, and your bragging about it, STFU

May 29th, 2008, 03:14 AM	#6
Jesussoldier Newbie Join Date: May 2008 Posts: 7 iTrader: 0 reviews	I have another question, could I have damaged my TPS sensor?

May 29th, 2008, 09:55 AM	#9
cliffyk Hardcore Enthusiast Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 1,362 iTrader: 0 reviews	Disconnect the battery for 5-7 minutes, the EMI/RFI glitch from the short could have scrambled the KAM (Keep Alive Memory] where all learned parameters (such as idle air trim, short and long term fuel trims, etc.) are stored. Disconnecting the battery for 5 minutes or more resets this memory and forces the PCM to relearn these values. The TPS has no active electronics (it's just a potentiometer) and is only connected to the PCM and ground. It is highly unlikely that shorting the battery damaged the TPS without taking out the PCM too. Same is true for the IAC. In the last--when using jumper cables; connect both positive cables first then both grounds (battery to be jumped last). In this way there is no common ground between the vehicles until the last ground is connected... When disconnecting do the both grounds first, then the positives. This removes the common ground first. It would also have prevented your faux pas... __________________ -cliff knight- My Mustang 2003 GT, UPR X, FRPP 24lb/h injectors, Magnaflow, 180° stat, PP 70mm TB & plenum, Delta Force Commando, Steeda UDPs, Ralco RZ_flywheel, RAM HDX clutch 3.73s, 262 rwHP/305 ft.lb. Flex-fuel: burns gas and rubber...

May 29th, 2008, 04:47 PM	#10
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,471 iTrader: 3 reviews	I wouldn't worry. Many times the car will set a high idle just after the ECU is reset (dead battery). Give it a day or 2 and it should go away. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

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