01 Svt Cobra help!

svt_01 · January 25th, 2012, 04:51 PM

I have a 01 cobra with 90k miles, take good care of it, i get a feeling around 1900rpms only of the engine acting like its missing, but never throws a code and seems to only do it when its colder out, and the engine isnt warmed up, i also know when i do a pass it will occasionally flash the check engine light saying multiple cylinders have misfired, could this be a coil on plug problem? any help would be greatly helpful.

04MidnightGT · January 25th, 2012, 05:13 PM

Check your cops and plugs before you do anything else.

THE RY4N · January 25th, 2012, 05:16 PM

My parent have a e150 with the 5.4l and it would misfire every once and a while especially when it was humid out and it got worse and worse but never threw a check engine light and when it finally did i pulled the info from my scanner and there was a misfire at 1750rpms replaced the two coil packs that went bad and no more problems sounds a lot like your problem and there were only 76,000 miles on it at the time.

svt_01 · January 25th, 2012, 05:28 PM

i think il just order a set of high performance cops because ive been wanting to do that for awhile and this just helped me descide to do that, i didnt know if it was more serious or not. im sure the 2 step and tune are a bit much for stock cops maybe.

04MidnightGT · January 25th, 2012, 05:53 PM

2 step probably fucked your injectors and or O2's...

termi_GT · January 25th, 2012, 05:58 PM

2-step shouldn't be effecting it. When was the last time you checked the plugs on it?? With it having 4-threaded plug holes I would check the trq on them and make sure none are coming loose.

Be sure to do this with the engine ICE COLD.

svt_01 · January 26th, 2012, 05:38 PM

i didnt think a 2 step would be invloved in causing problems, i did plugs about 5k miles ago. do they have a problem sometimes of coming loose? i think with my tune and higher timing, the stock cops are either worn out or cant keep up at higher rpms. You guys probably know alot more than me about this, shes my first dohc motor haha.

termi_GT · January 27th, 2012, 12:01 AM

Yes mod-motor plugs do have issues with blowing out. Check them.

jivepepper · January 27th, 2012, 01:17 AM

Also check you chassis ground.

Shaun03GT · January 27th, 2012, 02:48 AM

A misfire will tend to go away with more RPM. Unless theres just a connection then youll constintley have a misfire. My guess is a bad COP. Very common on these cars. You could wait til the car throws a code, which seems like these fucking cars take forever to throw the CEL on for a misfire, then switch that COP to a different cylinder, wait til the CEL goes on again and see if the code changed to the cylinder you changed it to.

WickedSnake00 · January 27th, 2012, 08:30 AM

Check the following things:
Spark plugs. Take them out, get a look at them, check the gap, re-install to proper torque.
COP's. Check all connections. Make sure they're installed firmly.
Check your stored codes. Typically misfire codes will tell you what cylinder. Focus on those, possibly switch their coils around and see if the problem follows the coils.

And FWIW, the "performance" coils are no better than OEM. In fact some have had more problems with the aftermarket ones than the OEM. OEM throws plenty of spark and is tough to beat for reliability.

svt_01 · January 27th, 2012, 04:25 PM

Ok thanks for all the help guys! Much appreciated! When i get home from college il give it a shot and let you know what i find out, btw where would the chassis ground be?

jivepepper · February 4th, 2012, 07:03 AM

Originally Posted by WickedSnake00

And FWIW, the "performance" coils are no better than OEM. In fact some have had more problems with the aftermarket ones than the OEM. OEM throws plenty of spark and is tough to beat for reliability.

Plus one. I have had great luck with the oem cops for over 8 years.

January 25th, 2012, 04:51 PM	#1
svt_01 Newbie 2001 Svt Cobra Join Date: Jan 2012 Location: Edwardsville,il Posts: 33 iTrader: 0 reviews	01 Svt Cobra help! I have a 01 cobra with 90k miles, take good care of it, i get a feeling around 1900rpms only of the engine acting like its missing, but never throws a code and seems to only do it when its colder out, and the engine isnt warmed up, i also know when i do a pass it will occasionally flash the check engine light saying multiple cylinders have misfired, could this be a coil on plug problem? any help would be greatly helpful.

January 25th, 2012, 05:13 PM	#2
04MidnightGT Hardcore Enthusiast 2004 Mustang GT 12.9 @ 111.44 Join Date: Jul 2011 Location: Wichita, KS Posts: 1,262 iTrader: 0 reviews	Check your cops and plugs before you do anything else. __________________ l Custom Hotside l TurboSmart l MHS l Hallman l On3 l BBK l Hellion l SCT l Flowmaster l Steeda l AEM l Tial l HPX l Hawk l Trickflow

January 25th, 2012, 05:16 PM	#3
THE RY4N Regular 1994 / 2001 Mustang GT Join Date: Jun 2011 Location: Andover, Minnesota Posts: 174 iTrader: 0 reviews	My parent have a e150 with the 5.4l and it would misfire every once and a while especially when it was humid out and it got worse and worse but never threw a check engine light and when it finally did i pulled the info from my scanner and there was a misfire at 1750rpms replaced the two coil packs that went bad and no more problems sounds a lot like your problem and there were only 76,000 miles on it at the time. __________________ 1994 Mustang GT Black-SOLD 2001 Mustang GT Electric Green 2001 Mazda Protege MP3

January 25th, 2012, 05:53 PM	#5
04MidnightGT Hardcore Enthusiast 2004 Mustang GT 12.9 @ 111.44 Join Date: Jul 2011 Location: Wichita, KS Posts: 1,262 iTrader: 0 reviews	2 step probably fucked your injectors and or O2's... __________________ l Custom Hotside l TurboSmart l MHS l Hallman l On3 l BBK l Hellion l SCT l Flowmaster l Steeda l AEM l Tial l HPX l Hawk l Trickflow

January 25th, 2012, 05:58 PM	#6
termi_GT Hardcore Enthusiast 12.41@114 Join Date: Dec 2011 Location: Joplin, MO Posts: 1,320 iTrader: 1 reviews	2-step shouldn't be effecting it. When was the last time you checked the plugs on it?? With it having 4-threaded plug holes I would check the trq on them and make sure none are coming loose. Be sure to do this with the engine ICE COLD. __________________ MM FOBRA CLUB CO-FOUNDER Last edited by termi_GT; January 25th, 2012 at 11:10 PM. Reason: Poor spelling.

January 25th, 2012, 05:28 PM	#4
svt_01 Newbie 2001 Svt Cobra Join Date: Jan 2012 Location: Edwardsville,il Posts: 33 iTrader: 0 reviews	i think il just order a set of high performance cops because ive been wanting to do that for awhile and this just helped me descide to do that, i didnt know if it was more serious or not. im sure the 2 step and tune are a bit much for stock cops maybe.

January 26th, 2012, 05:38 PM	#7
svt_01 Newbie 2001 Svt Cobra Join Date: Jan 2012 Location: Edwardsville,il Posts: 33 iTrader: 0 reviews	i didnt think a 2 step would be invloved in causing problems, i did plugs about 5k miles ago. do they have a problem sometimes of coming loose? i think with my tune and higher timing, the stock cops are either worn out or cant keep up at higher rpms. You guys probably know alot more than me about this, shes my first dohc motor haha.

January 27th, 2012, 12:01 AM	#8
termi_GT Hardcore Enthusiast 12.41@114 Join Date: Dec 2011 Location: Joplin, MO Posts: 1,320 iTrader: 1 reviews	Yes mod-motor plugs do have issues with blowing out. Check them. __________________ MM FOBRA CLUB CO-FOUNDER

January 27th, 2012, 01:17 AM	#9
jivepepper I Post Entirely Way Too Much Join Date: Mar 2006 Location: Under a sombrero Posts: 5,025 iTrader: 1 reviews	Also check you chassis ground. __________________ 665/541 WHP/WTQ 4.6L SOHC 2V ON 93 OCTANE PUMP GAS. NO METH INJ., NO E85, NO RACE GAS, N2O BABY BOTTLES! TRAP=POWER: 11.01 @135, IN SUMMER HEAT, 1350' TRACK, 315/35/17 DR'S

January 27th, 2012, 02:48 AM	#10
Shaun03GT I Post Entirely Way Too Much 2003 Mustang GT 1/8 - 7.92 @ 91.13mph 1/4 - 12.21 @ 115.84mph Join Date: Sep 2009 Location: Weymouth, MA Posts: 13,447 iTrader: 12 reviews	A misfire will tend to go away with more RPM. Unless theres just a connection then youll constintley have a misfire. My guess is a bad COP. Very common on these cars. You could wait til the car throws a code, which seems like these fucking cars take forever to throw the CEL on for a misfire, then switch that COP to a different cylinder, wait til the CEL goes on again and see if the code changed to the cylinder you changed it to. __________________ Vortech V1 Intercooled @ 11psi 394rwhp/392rwtq @ 9.5psi 415rwhp/400rwtq @ 11psi on Methanol Tuned By: Pete @ Performance Dyno Affordable Supercharger Build Guide Supercharger Info for Noobs

January 27th, 2012, 08:30 AM	#11
WickedSnake00 MM's king of Neon's 404 - car not found 17.81@87 Join Date: Aug 2010 Location: Diesel Engine Capital of the World, Columbus, IN Posts: 7,374 iTrader: 0 reviews	Check the following things: Spark plugs. Take them out, get a look at them, check the gap, re-install to proper torque. COP's. Check all connections. Make sure they're installed firmly. Check your stored codes. Typically misfire codes will tell you what cylinder. Focus on those, possibly switch their coils around and see if the problem follows the coils. And FWIW, the "performance" coils are no better than OEM. In fact some have had more problems with the aftermarket ones than the OEM. OEM throws plenty of spark and is tough to beat for reliability. __________________ Official Secondhand Snake Build Thread Here Looks Like a Cobra, Sounds Like a Cobra, Tastes Like a Cobra, Not a Cobra. For Sale: P71 Interceptor motor

January 27th, 2012, 04:25 PM	#12
svt_01 Newbie 2001 Svt Cobra Join Date: Jan 2012 Location: Edwardsville,il Posts: 33 iTrader: 0 reviews	Ok thanks for all the help guys! Much appreciated! When i get home from college il give it a shot and let you know what i find out, btw where would the chassis ground be?

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