Check Engine Light?

97GT4.6 · December 20th, 2007, 01:59 AM

So two days ago, I started my car in the cold, and the check engine light came on immediately. I ( like a dumbass) opened the hood for a visual inspection, but everything seemed fine.

I drive about 20 miles across town to visit my girl, and the temp gauge was still at the C. Then all of a sudden, it pops up to about the R.

Today, i had my heater on, and it started to smell pretty weird, and it was coming from the vents, and then it disappeared.

Then tonight, after it sat all day, and was cold once again, the Check engine light was off when i drove it, and it stayed off the whole way home.

I'm guessing i need a new thermostat, and a new idler pulley for sure, and my IAC is dirty, but none of those things should cause the Check engine light to come on?

Maybe it was the thermostat, and the Engine Coolant temp sensor saw something was wrong.

I didn't get a chance to get the codes read, so im not sure what they say.

And help guys?

Thanks

68 dlxcoupe · December 20th, 2007, 08:45 AM

The IAC will cause a check engine light. it will come up as an Idle Air Speed Control DTC. It happens to me every now and then, but thats just an option. As far as the other stuff, i have no clue man. Good luck

Casper98GT · December 20th, 2007, 08:51 AM

more than likely you have a p0125. the light will come on for a bad thermostat. Get the code checked and i can help more. If you do find you have a p0125, replace the thermostat and gasket.

MustangMatt96GT · December 20th, 2007, 09:41 AM

I just replaced my gasket because mine was leaking, but my heater no longer smells funny. Just food for thought.

icyalkn1 · December 20th, 2007, 11:06 AM

i hate that light

97GT4.6 · December 20th, 2007, 05:00 PM

Thanks guys, I'm gonna get get a new thermostat, because im pretty sure my thermostat is bad. I didn't know if that would throw a light tho.

Thanks for the help.

December 20th, 2007, 01:59 AM	#1
97GT4.6 Hardcore Enthusiast 97 GT 14.2@99.8 @ 4800 ft Join Date: Oct 2007 Location: Fort Collins and Pueblo, Colorado Posts: 2,347 iTrader: 1 reviews	Check Engine Light? So two days ago, I started my car in the cold, and the check engine light came on immediately. I ( like a dumbass) opened the hood for a visual inspection, but everything seemed fine. I drive about 20 miles across town to visit my girl, and the temp gauge was still at the C. Then all of a sudden, it pops up to about the R. Today, i had my heater on, and it started to smell pretty weird, and it was coming from the vents, and then it disappeared. Then tonight, after it sat all day, and was cold once again, the Check engine light was off when i drove it, and it stayed off the whole way home. I'm guessing i need a new thermostat, and a new idler pulley for sure, and my IAC is dirty, but none of those things should cause the Check engine light to come on? Maybe it was the thermostat, and the Engine Coolant temp sensor saw something was wrong. I didn't get a chance to get the codes read, so im not sure what they say. And help guys? Thanks __________________ Cammed 2v Built By MustangMatt More mods than times your daughter has slept around

December 20th, 2007, 08:45 AM	#2
68 dlxcoupe Enthusiast 2004 Mach 1 13.30 @ 104.47 Join Date: Jul 2006 Location: Richmond, Virginia Posts: 916 iTrader: 2 reviews	The IAC will cause a check engine light. it will come up as an Idle Air Speed Control DTC. It happens to me every now and then, but thats just an option. As far as the other stuff, i have no clue man. Good luck __________________ EAGLE SCOUTS OR GTFO MyStangOpens (12:01:05 AM): honey nut for me

December 20th, 2007, 08:51 AM	#3
Casper98GT Hardcore Enthusiast Join Date: Aug 2005 Location: NEW HAMPSHIRE Posts: 2,393 iTrader: 0 reviews	more than likely you have a p0125. the light will come on for a bad thermostat. Get the code checked and i can help more. If you do find you have a p0125, replace the thermostat and gasket. __________________ 91 LX, 5spd. Ex:Toyota/Ford tech Marine Machinery Technician, Department of Defense.

December 20th, 2007, 09:41 AM	#4
MustangMatt96GT Proud American 1996 Mustang GT Join Date: Dec 2006 Location: Lakewood, CO Posts: 10,689 iTrader: 3 reviews	I just replaced my gasket because mine was leaking, but my heater no longer smells funny. Just food for thought. __________________ RIP Travis Billings Special Thanks to: Andrews Racing Transmissions Baseline Suspensions 25.3 SFI Chassis Build Never Lift Racecars

December 20th, 2007, 05:00 PM	#6
97GT4.6 Hardcore Enthusiast 97 GT 14.2@99.8 @ 4800 ft Join Date: Oct 2007 Location: Fort Collins and Pueblo, Colorado Posts: 2,347 iTrader: 1 reviews	Thanks guys, I'm gonna get get a new thermostat, because im pretty sure my thermostat is bad. I didn't know if that would throw a light tho. Thanks for the help. __________________ Cammed 2v Built By MustangMatt More mods than times your daughter has slept around

December 20th, 2007, 11:06 AM	#5
icyalkn1 Newbie Join Date: Dec 2007 Posts: 10 iTrader: 0 reviews	i hate that light

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