2004 Mach 1 Hesitating - 2003-04 Mach 1 Registry Owners Club

WhiteMach13 · 08-21-2011, 03:00 PM

A few weeks ago I noticed a slight hesitation under low RPM's while accelerating. The problem slowly started getting worse so I took it to my mechanic. He said he thought one of the cylinders was missing, but since the check engine light was not on, the computer would not tell him which cylinder was misfiring. The problem has gotten much worse and the check engine light is still not coming on. It is now hesitating throughout the RMP range and is very noticeable. Any ideas of what the problem could be?

rich1 · 08-21-2011, 03:39 PM

I like this .

..since the MIL light is not on he does not know what to do? The computer mis -fire count has to get to a certain number of mis -fires before it set off the MIL light. In some cases it may be so random it wont ever trip the MIL at all. However you can take a COP off each plug one at a time while the engine is running or just run Fords cylinder balance test.

Mach1owner · 08-21-2011, 03:54 PM

My problem was the same as yours. I got progressivly worse and started around 15-2500 rpm under light accel.

My issue was the front 02 sensors.

I may have a slight misfire but cant tell right now. Pulled the COP off one at a time and all had the same effect.

Could be a few issues tho. GL

rich1 · 08-21-2011, 04:11 PM

Quote:

Originally Posted by Mach1owner

My problem was the same as yours. I got progressivly worse and started around 15-2500 rpm under light accel.

My issue was the front 02 sensors.

I may have a slight misfire but cant tell right now. Pulled the COP off one at a time and all had the same effect.

Could be a few issues tho. GL

Probably not..

.If it was an O2 sensor the MIL would throw a code , or you could test the sensor using pinpoint test or datalog on a scanner.
A bad or weak injector can cause this , wiring to the PCM or PCM itself.Best to take the car to the Dealer and get them to do an NGS scan on the whole system.

Mach1owner · 08-21-2011, 06:18 PM

how many miles on the car.

really this could be so many things. Maf, COP, Injecor, o2. need to have someone hook up a scanner and take a look.

blown03Mach1 · 08-21-2011, 08:26 PM

When was the last time you changed your fuel filter?

WhiteMach13 · 08-22-2011, 12:49 AM

Has close to 60k miles on it, and never changed the fuel filter which I'm now realizing was probably a huge mistake by me.

jpilone · 08-22-2011, 08:58 AM

Someone on here told me, if you're getting some random misfires, go wide open throttle to about 90mph and you'll get your CEL..

I did that, and sure enough I did, and wound up replacing the #4 cylinder COP

WhiteMach13 · 08-22-2011, 10:32 AM

I'll give that a try today. Thanks for all the help everyone

Monster Mach · 08-22-2011, 10:44 AM

Quote:

Originally Posted by jpilone

Someone on here told me, if you're getting some random misfires, go wide open throttle to about 90mph and you'll get your CEL..

I did that, and sure enough I did, and wound up replacing the #4 cylinder COP

That was me

little trick I did one day.. mine was cylinder 5.. and make sure u look up what cylinder is which.. ford couldn't be easy with 12345678 nooo they gotta do it 56781234

iudelt89 · 08-22-2011, 12:55 PM

This could also be something as simple as changing fouled out spark plugs. My friend has an '02 GT that was having the exact same problems you have been describing. The hesitation he was experiencing was awful. Pulled the plugs out and they actually didn't look too bad. The worst of them were on cylindars 3 and 5. Regardless, after the swap the car is running like new. I hope this is the issue with yours and not something more serious (and expensive). Good luck.

WhiteMach13 · 08-22-2011, 06:16 PM

Tried going 90 today, got it up to about 100 and still no check engine light. However there was only hesitation in 5th gear for about 10 seconds on the highway, other then that it was fine all day. Going to change the fuel filter tomorrow and drive it again and see if that fixes anything. Thanks

WhiteMach13 · 08-24-2011, 01:47 PM

Took it to the dealer service today and found out I need a new spark plug and coil in one of the cylinders. Anyone know of where I can find install info? Also I want to get the motorcraft coil, but am having trouble finding the exact one I need. Found a few that say they fit but not sure which to get. Thanks

jpilone · 08-24-2011, 02:26 PM

They are so easy to change!

Driver's side:

Remove the two 10mm bolts from the cover that says "V8 32 Valve" and lift off cover. The coils are right under there.

Passenger side:

With flatblade screwdriver, loose clamps at MAF sensor and throttle body and remove the intake tube and set aside

Remove the two 10mm bolts from the coil cover and lift off cover. The coils are right under there.

When reinstalling covers, make sure gaskets are straight in cover, and harnesses towards rear do not get pinched by cover.

jpilone · 08-24-2011, 02:27 PM

By the way, I just got one coil from Advance auto, BWD brand I beleive, it was like $45 and has a lifetime warranty...

Monster Mach · 08-24-2011, 02:34 PM

Iv been having the hesitation for a while... coils fixed it completely.. then it came back.. I changed the plugs 2 times now.. its just at low rpm and rowwing through the gears I can feel a slight pause.. barely noticable to a unknown

Bmeagher · 08-24-2011, 02:55 PM

Buy all 8 coils

http://www.cjponyparts.com/ford-raci...10/p/M120294V/

jpilone · 08-24-2011, 03:21 PM

Quote:

Originally Posted by Bmeagher

Buy all 8 coils

http://www.cjponyparts.com/ford-raci...10/p/M120294V/

I couldn't afford to change all 8 personally..

I changed all my plugs, and used dielectric grease on all connections on the remaining coils

Mach351 · 08-25-2011, 11:31 AM

Quote:

Originally Posted by Bmeagher

Buy all 8 coils

http://www.cjponyparts.com/ford-raci...10/p/M120294V/

^ you will likely end up doing this soon anyway

i have to agree here as it is easier to do it all at once rather than one at a time over the next few months

STREET BULLY · 09-23-2011, 05:47 PM

Quote:

Originally Posted by Monster Mach

Iv been having the hesitation for a while... coils fixed it completely.. then it came back.. I changed the plugs 2 times now.. its just at low rpm and rowwing through the gears I can feel a slight pause.. barely noticable to a unknown

TRY some 44k at a 1/4 tank and fill with 93 that should help. How many on the clock?

04dsgMACHONE · 09-23-2011, 06:15 PM

Mine was missing when I first got the car, and after "cleaning" my engine bay a little water from misting it off got in the coil cover and it got worse causing my check engine light to come on. Ended up replacing all my spark plugs and one COP and it was perfect after that.

SilverStang23 · 11-17-2011, 09:10 PM

Quote:

Originally Posted by WhiteMach13

Took it to the dealer service today and found out I need a new spark plug and coil in one of the cylinders. Anyone know of where I can find install info? Also I want to get the motorcraft coil, but am having trouble finding the exact one I need. Found a few that say they fit but not sure which to get. Thanks

Did this end up fixing your problem? I'm having the exact same issue with mine.

08-21-2011, 03:00 PM	#1
WhiteMach13 Registered User Join Date: Jun 2007 Location: Burlington, New Jersey Posts: 15	2004 Mach 1 Hesitating A few weeks ago I noticed a slight hesitation under low RPM's while accelerating. The problem slowly started getting worse so I took it to my mechanic. He said he thought one of the cylinders was missing, but since the check engine light was not on, the computer would not tell him which cylinder was misfiring. The problem has gotten much worse and the check engine light is still not coming on. It is now hesitating throughout the RMP range and is very noticeable. Any ideas of what the problem could be?

08-21-2011, 03:39 PM	#2
rich1 AUTOMACHTIC Join Date: Oct 2007 Location: RTP/ N.C. Posts: 4,813	Re: 2004 Mach 1 Hesitating I like this ...since the MIL light is not on he does not know what to do? The computer mis -fire count has to get to a certain number of mis -fires before it set off the MIL light. In some cases it may be so random it wont ever trip the MIL at all. However you can take a COP off each plug one at a time while the engine is running or just run Fords cylinder balance test. __________________ UPGRADES...Tokico Illuminas Borla SS Catback , Steeda Underdrives , Strut Brace , HPM Lower K Brace , L /C Arms , U /C Arms , HPM PanHard Bar, K&N FRPK 2, GOODYEAR GT1 , MRT- H-Pipe , JLT VaporTraps , SLP-12'" Tips! , FRPP Shorty 1 5/8 Headers , Brembo D/S & PBR D/S Rotors ,FRPP Alum.DS ,Roys 3/8 Spacer , SVT Focus 255 pump SCTsw Chip PRO-DYNOjet NA 300.01hp /315tq (Auto) ,Innovate W/B ,Compucar Wet Kit (90jet) + Heater and E Gauge * 360 hp/385tq 12.5 -1/4 @112 Last edited by rich1; 08-21-2011 at 03:59 PM.

08-21-2011, 03:54 PM	#3
Mach1owner Registered User Join Date: Jun 2009 Location: Toronto, Ontario Posts: 232	Re: 2004 Mach 1 Hesitating My problem was the same as yours. I got progressivly worse and started around 15-2500 rpm under light accel. My issue was the front 02 sensors. I may have a slight misfire but cant tell right now. Pulled the COP off one at a time and all had the same effect. Could be a few issues tho. GL __________________ 03 Mach Kooks LT Catted Bassani X Magnaflow CB Ford Racing Aluminum Driveshaft FRPP 4.30 31 spline Cobra diff and Moser Axles K&N drop in 10.5 DD wrapped with 315 35 17 NT05 SCT tuned 308/314

08-21-2011, 06:18 PM	#5
Mach1owner Registered User Join Date: Jun 2009 Location: Toronto, Ontario Posts: 232	Re: 2004 Mach 1 Hesitating how many miles on the car. really this could be so many things. Maf, COP, Injecor, o2. need to have someone hook up a scanner and take a look. __________________ 03 Mach Kooks LT Catted Bassani X Magnaflow CB Ford Racing Aluminum Driveshaft FRPP 4.30 31 spline Cobra diff and Moser Axles K&N drop in 10.5 DD wrapped with 315 35 17 NT05 SCT tuned 308/314

08-21-2011, 08:26 PM	#6
blown03Mach1 8LB YNER Join Date: Mar 2005 Location: Tampa Posts: 5,661	Re: 2004 Mach 1 Hesitating When was the last time you changed your fuel filter? __________________ Just because you're winnin' Don't mean you're the lucky ones TR 2003 (Jezebel) sold Mar 12...

08-22-2011, 12:49 AM	#7
WhiteMach13 Registered User Join Date: Jun 2007 Location: Burlington, New Jersey Posts: 15	Re: 2004 Mach 1 Hesitating Has close to 60k miles on it, and never changed the fuel filter which I'm now realizing was probably a huge mistake by me.

08-22-2011, 08:58 AM	#8
jpilone Uncertified Gynocologist Join Date: Jun 2011 Location: Boca Raton, FL Posts: 738	Re: 2004 Mach 1 Hesitating Someone on here told me, if you're getting some random misfires, go wide open throttle to about 90mph and you'll get your CEL.. I did that, and sure enough I did, and wound up replacing the #4 cylinder COP __________________ '04 Mach 1/5-Speed/CO SOLD 10/31/15! '16 S550 GT 5.0 Traded 7/28/16 '16 Shelby GT350 Track Package/White/Blue Stripes!

08-22-2011, 10:32 AM	#9
WhiteMach13 Registered User Join Date: Jun 2007 Location: Burlington, New Jersey Posts: 15	Re: 2004 Mach 1 Hesitating I'll give that a try today. Thanks for all the help everyone

08-22-2011, 12:55 PM	#11
iudelt89 United We Stang Join Date: Jun 2011 Location: Libertyvile, IL Posts: 985	Re: 2004 Mach 1 Hesitating This could also be something as simple as changing fouled out spark plugs. My friend has an '02 GT that was having the exact same problems you have been describing. The hesitation he was experiencing was awful. Pulled the plugs out and they actually didn't look too bad. The worst of them were on cylindars 3 and 5. Regardless, after the swap the car is running like new. I hope this is the issue with yours and not something more serious (and expensive). Good luck. __________________ Black Staggered FR500's, SSS Adrenaline Cat-Back, JBA o/r h-pipe, MGW Short Throw Shifter, H&R SS Springs, Bilstein HD's, MM Bumpsteer, MM CC Plates, Kenny Brown Extreme Subframe Matrix, FRPP Alum Driveshaft, 2000 Cobra R front brake kit, MM pan hard bar, MM LCA's, K&N FIPK Intake, Bama Tune, Shaker Diverter, FRPP 3.73s, Moser 31 spline axles, FRPP diff cover, FRPP Traction-Lok diff, Kenny Brown Brake Ducts '04 Black 5-Speed Mach 1, 2000 Jeep Grand Cherokee

08-22-2011, 06:16 PM	#12
WhiteMach13 Registered User Join Date: Jun 2007 Location: Burlington, New Jersey Posts: 15	Re: 2004 Mach 1 Hesitating Tried going 90 today, got it up to about 100 and still no check engine light. However there was only hesitation in 5th gear for about 10 seconds on the highway, other then that it was fine all day. Going to change the fuel filter tomorrow and drive it again and see if that fixes anything. Thanks

08-24-2011, 01:47 PM	#13
WhiteMach13 Registered User Join Date: Jun 2007 Location: Burlington, New Jersey Posts: 15	Re: 2004 Mach 1 Hesitating Took it to the dealer service today and found out I need a new spark plug and coil in one of the cylinders. Anyone know of where I can find install info? Also I want to get the motorcraft coil, but am having trouble finding the exact one I need. Found a few that say they fit but not sure which to get. Thanks

08-24-2011, 02:26 PM	#14
jpilone Uncertified Gynocologist Join Date: Jun 2011 Location: Boca Raton, FL Posts: 738	Re: 2004 Mach 1 Hesitating They are so easy to change! Driver's side: Remove the two 10mm bolts from the cover that says "V8 32 Valve" and lift off cover. The coils are right under there. Passenger side: With flatblade screwdriver, loose clamps at MAF sensor and throttle body and remove the intake tube and set aside Remove the two 10mm bolts from the coil cover and lift off cover. The coils are right under there. When reinstalling covers, make sure gaskets are straight in cover, and harnesses towards rear do not get pinched by cover. __________________ '04 Mach 1/5-Speed/CO SOLD 10/31/15! '16 S550 GT 5.0 Traded 7/28/16 '16 Shelby GT350 Track Package/White/Blue Stripes!

08-24-2011, 02:27 PM	#15
jpilone Uncertified Gynocologist Join Date: Jun 2011 Location: Boca Raton, FL Posts: 738	Re: 2004 Mach 1 Hesitating By the way, I just got one coil from Advance auto, BWD brand I beleive, it was like $45 and has a lifetime warranty... __________________ '04 Mach 1/5-Speed/CO SOLD 10/31/15! '16 S550 GT 5.0 Traded 7/28/16 '16 Shelby GT350 Track Package/White/Blue Stripes!

08-24-2011, 02:34 PM	#16
Monster Mach Registered User Join Date: Oct 2009 Location: Endicott New York now maryland ft wash for work Posts: 1,123	Iv been having the hesitation for a while... coils fixed it completely.. then it came back.. I changed the plugs 2 times now.. its just at low rpm and rowwing through the gears I can feel a slight pause.. barely noticable to a unknown __________________ 04 mach 1 Oxford white For h.i.d's dont buy ddm or hid guy.. buy vvme.com they are the best and by far the cheapest

08-24-2011, 02:55 PM	#17
Bmeagher Registered User Join Date: Feb 2008 Location: Cowtown, Alberta Posts: 1,261	Re: 2004 Mach 1 Hesitating Buy all 8 coils http://www.cjponyparts.com/ford-raci...10/p/M120294V/ __________________ Maximum Motorsports race series shocks/struts, coilovers front and rear, K member, bump steer kit, solid steering shaft, Panhard bar. Built Rear End with 4.30's, Hooker longtubes, Comp 106100's, Fidanza Aluminum Flywheel, Centerforce DF, *FR500 intaked 1/2" Spacer, Livernois Springs, Ford GT Followers in the works.* *SAE 378RWHP ,302 ft/lbs* 70-120mph run http://www.youtube.com/watch?v=1hqjiOeYWAE

09-23-2011, 06:15 PM	#21
04dsgMACHONE Registered User Join Date: Apr 2010 Location: Winston-Salem, NC Posts: 494	Re: 2004 Mach 1 Hesitating Mine was missing when I first got the car, and after "cleaning" my engine bay a little water from misting it off got in the coil cover and it got worse causing my check engine light to come on. Ended up replacing all my spark plugs and one COP and it was perfect after that. __________________ 2004 DSG Mach 1 MGW STS, JLT RAI, PHP 3/8" Intake spacer, Bassani catted x-pipe, Magnaflow Magnapacks, FRPP (Motive) 4.30s, 31 Spline Cobra Differential, 31 Spline Moser Axles, GMS Girdle, H&R Super Sports, Koni Yellow Adjustable shocks/struts, MM caster/camber plates

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