check engine light

smott · September 9th, 2008, 10:50 PM

I have a 94 GT basically stock just 2 steps colder on the plugs(for the zex 100 shot) and an offroad x-pipe. So today on my way to school i was in fifth gear at around 1500 rpms going up a hill and my check engine light went on. shortly after going down the hill it went off. the car doesnt seem to have a low rpm misfire or anything but could it possibly be the o2 sensor is just reading the car at full rich or something??? just kinda curious what you guys have to say.

lowp51 · September 9th, 2008, 11:55 PM

mine does the same thing, but I know i have a bad cat thats screwing up my o2, so your on the right track thinking its you o2 sending the check engine code.

WildWill · September 10th, 2008, 02:05 PM

have your computer run for codes... if something is tripping or has tripped you will find out

94silverGT · September 10th, 2008, 11:28 PM

Same thing as lowp51 happens to me. +1 on the o2 sensor reading rich

97mustanggt · September 11th, 2008, 12:20 AM

well u have off road x...off course ur check engine light is gonna be on...

1slo5.0 · September 11th, 2008, 10:13 AM

Why do you have 2 step colder plugs? Just curious....

2002BLGT · September 11th, 2008, 02:31 PM

Originally Posted by 97mustanggt

well u have off road x...off course ur check engine light is gonna be on...

94-95s should not trip a check engine light for off road pipes because they dont have rear 02s reading after the cats

95stroker · September 11th, 2008, 05:29 PM

2002BLGT is right, they won't throw a code with an off road x or h pipe. However I do believe the 02 sensors will - that'd be the first thing I'd check out. Or like someone else mentioned, plug it in and see if the scanner picks anything up.

smott · September 12th, 2008, 01:21 AM

yea 94-95 the o2 sensor is in front of where the cat would be. it reads the mixture before the cat not after like 96 and up. and thanks for the response guys ill def have the codes read.

smott · September 12th, 2008, 01:25 AM

Originally Posted by Darrell

Why do you have 2 step colder plugs? Just curious....

because when you run the dry shot of nitrous it will lean the car out therefor causing a hotter spark. so to keep it from getting super lean/hot ZEX recommends going with colder plugs

97mustanggt · September 12th, 2008, 02:03 AM

Originally Posted by 2002BLGT

94-95s should not trip a check engine light for off road pipes because they dont have rear 02s reading after the cats

oh i c well thanx guys i didnt even know...

1slo5.0 · September 12th, 2008, 10:20 AM

Originally Posted by smott

because when you run the dry shot of nitrous it will lean the car out therefor causing a hotter spark. so to keep it from getting super lean/hot ZEX recommends going with colder plugs

A dry system does not lean the engine out. If you went lean with nitrous you would have a pile of aluminum inside the engine. The heat range of the plug has nothing to do with the temperature of the spark. No matter what heat range the plug is the spark is still the same temperature and voltage. All a colder heat range does is remove heat from the combustion chamber quicker than a hotter plug, basically cools the spark plug quicker. Too cold of a spark plug can cause issues.

I just had to ask because every so often I see people post that they have colder plugs and they are only running a small amount of nitrous. I never understood why...

smott · September 15th, 2008, 12:14 AM

Originally Posted by Darrell

A dry system does not lean the engine out. If you went lean with nitrous you would have a pile of aluminum inside the engine. The heat range of the plug has nothing to do with the temperature of the spark. No matter what heat range the plug is the spark is still the same temperature and voltage. All a colder heat range does is remove heat from the combustion chamber quicker than a hotter plug, basically cools the spark plug quicker. Too cold of a spark plug can cause issues.

I just had to ask because every so often I see people post that they have colder plugs and they are only running a small amount of nitrous. I never understood why...

A dry system does lean the engine.... if you dont have enough fuel to keep the mixture correct because no fuel is added when the nitrous is injected.......

1slo5.0 · September 15th, 2008, 09:34 AM

Originally Posted by smott

A dry system does lean the engine.... if you dont have enough fuel to keep the mixture correct because no fuel is added when the nitrous is injected.......

No a dry system does not lean the engine out. The term "Dry system" doesn't mean no fuel is introduced to the system. Additional fuel is most definitely added to the mixture when using a dry system but its not added with the nitrous mixture, hence the term "Dry". If no additional fuel was added there would be no horsepower gain. It seems that you need to study nitrous systems a bit more because you definitely do not understand a dry system or how it works.

smott · September 17th, 2008, 01:00 AM

No i understand how the systems works, but i was taking it as if you were saying fuel was added with the nitrous. I do know that a dry systems works by increasing the fuel pressure to the injectors which in turn does add more fuel. And i dont see the need to get offensive because i was not trying to insult you i was just reading what u said differently. And i know from expierence that you can lean out your motor because i have blown up a 5.0 from running a 125hp dry shot but the fuel pump didnt keep up and ended up blowing the motor.

1slo5.0 · September 17th, 2008, 09:04 AM

Originally Posted by smott

No i understand how the systems works, but i was taking it as if you were saying fuel was added with the nitrous. I do know that a dry systems works by increasing the fuel pressure to the injectors which in turn does add more fuel. And i dont see the need to get offensive because i was not trying to insult you i was just reading what u said differently. And i know from expierence that you can lean out your motor because i have blown up a 5.0 from running a 125hp dry shot but the fuel pump didnt keep up and ended up blowing the motor.

I never said anything remotely close to fuel was added with the nitrous on a dry system. The original point was that you don't need plugs that are 2 heat ranges cooler and I was questioning whether you actually knew what a colder plug did. One heat range colder is plenty with 125hp jets and even 200hp jets.. but to each his own.

As far as the engine blowing up, yes nitrous causes an extreme lean condition when there is no fuel like I mentioned in a previous post. Your fuel pumped failed and wrecked your engine, the dry nitrous kit had nothing to do with it.

September 9th, 2008, 10:50 PM	#1
smott Regular 1994 GT 11.75@120 Join Date: Mar 2008 Location: Pennsburg Posts: 164 iTrader: 0 reviews	check engine light I have a 94 GT basically stock just 2 steps colder on the plugs(for the zex 100 shot) and an offroad x-pipe. So today on my way to school i was in fifth gear at around 1500 rpms going up a hill and my check engine light went on. shortly after going down the hill it went off. the car doesnt seem to have a low rpm misfire or anything but could it possibly be the o2 sensor is just reading the car at full rich or something??? just kinda curious what you guys have to say. __________________ Ford Racing R block stroked 347. Trickflow stage 1 cam, Trickflow street burner upper and lower, gt40P heads, BBk 75mmTB, 03 cobra MAF, Zex dry kit, Tuned by PSI Motorsports, stock valve covers... E/T: 11.75 @ 120mph 2.0 60foot

September 9th, 2008, 11:55 PM	#2
lowp51 Regular 1995 mustang gt Join Date: Aug 2008 Location: Virginia Posts: 111 iTrader: 0 reviews	mine does the same thing, but I know i have a bad cat thats screwing up my o2, so your on the right track thinking its you o2 sending the check engine code. __________________ If only superchargers grew on tree's

September 10th, 2008, 02:05 PM	#3
WildWill Hardcore Enthusiast 1995 Mustang GT Join Date: Oct 2007 Location: Solomons, MD Posts: 1,112 iTrader: 0 reviews	have your computer run for codes... if something is tripping or has tripped you will find out __________________ GT40p heads, 1.7 crane RR's, GT40 u/l, MAC LTs, MAC o/r h-pipe, Flowmaster 40s, 65mm t/b, '03 Cobra Bilstein Struts, Tokico Bullitt Shocks, MM c/c plates, Eibach Sportlines, B&M shifter, 255lph f/p, RAM p/g clutch, Fidanza alum fly, rebuilt t-5

September 10th, 2008, 11:28 PM	#4
94silverGT Newbie 1994 Mustang GT Join Date: Aug 2008 Location: Florida Posts: 25 iTrader: 0 reviews	Same thing as lowp51 happens to me. +1 on the o2 sensor reading rich __________________ 1994 Mustang GT stock 5.0L K&N Fliter Hurst Pistol Grip Shifter Rear Seat Delete Euro Tail Lights Flowtech O/R H-pipe Flowmaster Glasspacks '99 GT Rims

September 11th, 2008, 10:13 AM	#6
1slo5.0 MM Ninjas! 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: North Fond du Lac, Wisconsin Posts: 11,375 iTrader: 1 reviews	Why do you have 2 step colder plugs? Just curious.... __________________ My daily driver has 16 cylinders and 4400hp @ 1000 rpm.... ***1988 Mustang GT - Stock....almost

September 11th, 2008, 12:20 AM	#5
97mustanggt Hardcore Enthusiast 97GT & 97Snake & 00L T.B.A Join Date: Aug 2008 Location: Richgrove, Ca Posts: 2,183 iTrader: 0 reviews	well u have off road x...off course ur check engine light is gonna be on...

September 11th, 2008, 05:29 PM	#8
95stroker Regular 1995 Mustang GT Join Date: May 2008 Location: Lincoln, NE Posts: 254 iTrader: 0 reviews	2002BLGT is right, they won't throw a code with an off road x or h pipe. However I do believe the 02 sensors will - that'd be the first thing I'd check out. Or like someone else mentioned, plug it in and see if the scanner picks anything up.

September 12th, 2008, 01:21 AM	#9
smott Regular 1994 GT 11.75@120 Join Date: Mar 2008 Location: Pennsburg Posts: 164 iTrader: 0 reviews	yea 94-95 the o2 sensor is in front of where the cat would be. it reads the mixture before the cat not after like 96 and up. and thanks for the response guys ill def have the codes read. __________________ Ford Racing R block stroked 347. Trickflow stage 1 cam, Trickflow street burner upper and lower, gt40P heads, BBk 75mmTB, 03 cobra MAF, Zex dry kit, Tuned by PSI Motorsports, stock valve covers... E/T: 11.75 @ 120mph 2.0 60foot

September 17th, 2008, 01:00 AM	#15
smott Regular 1994 GT 11.75@120 Join Date: Mar 2008 Location: Pennsburg Posts: 164 iTrader: 0 reviews	No i understand how the systems works, but i was taking it as if you were saying fuel was added with the nitrous. I do know that a dry systems works by increasing the fuel pressure to the injectors which in turn does add more fuel. And i dont see the need to get offensive because i was not trying to insult you i was just reading what u said differently. And i know from expierence that you can lean out your motor because i have blown up a 5.0 from running a 125hp dry shot but the fuel pump didnt keep up and ended up blowing the motor. __________________ Ford Racing R block stroked 347. Trickflow stage 1 cam, Trickflow street burner upper and lower, gt40P heads, BBk 75mmTB, 03 cobra MAF, Zex dry kit, Tuned by PSI Motorsports, stock valve covers... E/T: 11.75 @ 120mph 2.0 60foot

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