Car bucks and jumps forward

sstang02 · November 9th, 2010, 05:49 PM

Hey everyone i had a thread on here before but now i cant find it so this is an update. My car recently had cams installed and a custom tune and now from about 35-42mph with the gas be held steadily at any of those MPHs my car jumps and jerks forward it feels like its bucking forward and it shakes and i have no idea what could be wrong. The only thing that i know is wrong is that the CEL light is on and its a cam sensor. Any ideas would be appreciated. Thanks

bandity2k00 · November 9th, 2010, 05:54 PM

Try changing the cam position sensor

sstang02 · November 9th, 2010, 06:03 PM

Originally Posted by bandity2k00

Try changing the cam position sensor

Any idea where the location of the sensor is?

sharkbait · November 9th, 2010, 06:22 PM

driver side of the motor under the power steering resivoir

You need to take that braket off to get to it

sstang02 · November 10th, 2010, 12:01 AM

alright thanks guy, ill try this an update tommorow.

K_Boss01GT · November 10th, 2010, 12:32 AM

not trying to jack his thread but do u need to change out the sensor when you get cams done?? im about to have that happen shortly and i want to have everything done once the right way

1_nice_03_gt · November 10th, 2010, 12:50 AM

see if ur maf is connected right mines wasnt n it did this lol i know im an idiot lol

mrbigjeep · November 10th, 2010, 07:20 AM

if it just happened when you installed the cams then likely that its not back together like it came off...not likely that it would go out RIGHT after you install the cams...possible though...

and if it did it would probably be the actual cam syncro and not the sensor itself...my buddies car just did this and it would almost throw you in the windshield feeling like the engine was about to lock up lol...if its the sncro though, you usually have a very noticeable chirping sound...

sstang02 · November 10th, 2010, 11:08 AM

Originally Posted by 1_nice_03_gt

see if ur maf is connected right mines wasnt n it did this lol i know im an idiot lol

How was it not connected right? because i didnt even take my MAF off i took off the whole intake from the throttle body and didnt take it apart.

sstang02 · November 10th, 2010, 11:09 AM

Originally Posted by mrbigjeep

if it just happened when you installed the cams then likely that its not back together like it came off...not likely that it would go out RIGHT after you install the cams...possible though...

and if it did it would probably be the actual cam syncro and not the sensor itself...my buddies car just did this and it would almost throw you in the windshield feeling like the engine was about to lock up lol...if its the sncro though, you usually have a very noticeable chirping sound...

There is no chirping noise at all though....and mine doesnt feel like that hard of jerk, its just a pretty good shaking at those speeds and idk what it is!!!

sstang02 · November 10th, 2010, 11:09 AM

UPDATE: i changed out the cam position sensor and nothing happened still jerks and shakes around 38-40mph....ughhh.. the only good thing is that the CEL light went off

BakerFX4 · November 10th, 2010, 11:13 AM

what rpms is this happening at and what cams?

sstang02 · November 10th, 2010, 11:17 AM

Originally Posted by BakerFX4

what rpms is this happening at and what cams?

pretty sure around 1200-1500rpms with comp cams xe268h.....someone was telling me maybe in my tune i got done the load is adjusted wrong?

sstang02 · November 10th, 2010, 11:18 AM

ALSO if i turn off overdrive it stops but i think thats just because it eliminates 4th gear and the rpms go up so could this possibly be my 4:10s or tranny problems?

BakerFX4 · November 10th, 2010, 11:19 AM

well, how bad does it buck and jump? thats pretty low rpms to try and cruise at with a cammed car. Mine doesnt like that low of rpms for sure!

sstang02 · November 10th, 2010, 11:20 AM

its pretty noticeable but the weird thing is that at any other speed at that rpms its doesnt do it

blally89 · November 10th, 2010, 11:39 AM

honestly even with stock cams I believe you could experience some sort of bucking and jerking with the 4.10 gears at such low rpms.. I experience it somewhat when im in 1st and 2nd gear if my rpms are very low at around 1100rpms and it probably makes it even worse with the cams you have and also depending on the tune that you got with it. Why don't you try to get another tune?

sstang02 · November 10th, 2010, 12:03 PM

Originally Posted by blally89

honestly even with stock cams I believe you could experience some sort of bucking and jerking with the 4.10 gears at such low rpms.. I experience it somewhat when im in 1st and 2nd gear if my rpms are very low at around 1100rpms and it probably makes it even worse with the cams you have and also depending on the tune that you got with it. Why don't you try to get another tune?

well i just got this tune done about a month ago and im in college so i really dont have an extra 350

BakerFX4 · November 10th, 2010, 12:41 PM

Im thinking its the same for everyone. Mine is noticeable too but i understand that i have cams and cant drive at 1000-1400 rpms and it be too pleasant.

sstang02 · November 15th, 2010, 08:27 PM

bump...any other opinions?

November 9th, 2010, 05:49 PM	#1
sstang02 Regular 2002 Mustang Gt 13.4 Join Date: Sep 2010 Location: Chicago, IL Posts: 264 iTrader: 1 reviews	Car bucks and jumps forward Hey everyone i had a thread on here before but now i cant find it so this is an update. My car recently had cams installed and a custom tune and now from about 35-42mph with the gas be held steadily at any of those MPHs my car jumps and jerks forward it feels like its bucking forward and it shakes and i have no idea what could be wrong. The only thing that i know is wrong is that the CEL light is on and its a cam sensor. Any ideas would be appreciated. Thanks

November 9th, 2010, 05:54 PM	#2
bandity2k00 Baker Jr. 2002 Mustang GT Coming after build!! Join Date: Mar 2008 Location: Gambrills,MD Posts: 2,913 iTrader: 3 reviews	Try changing the cam position sensor __________________ MMR-Modular Mustang Racing Phils Machining-For your ABS Module Delete Manifold! American Muscle-www.Americanmuscle.com HorsePower By Hermonn-TUNER THANKS TO ALL SPONSORS,READY FOR THIS 2012 RACING SEASON!

November 9th, 2010, 06:22 PM	#4
sharkbait Hooo Ha Ha 1997 Mustang GT 11.65 @ 115 Join Date: Apr 2009 Location: Pasadena MD Posts: 9,743 iTrader: 10 reviews	driver side of the motor under the power steering resivoir You need to take that braket off to get to it __________________ 410rwhp 520rwtq @ 12.9 psi

November 10th, 2010, 12:32 AM	#6
K_Boss01GT Regular 2012 5.0 N/A Join Date: Oct 2010 Location: Tucson, AZ Posts: 386 iTrader: 0 reviews	not trying to jack his thread but do u need to change out the sensor when you get cams done?? im about to have that happen shortly and i want to have everything done once the right way __________________ 2012 Black GT, 3.73, bassani axel backs, MGW shifter ordered!!! MFE - If Engines can't fix it, your're f#@ked

November 10th, 2010, 12:50 AM	#7
1_nice_03_gt Hardcore Enthusiast 2003 ford mustang gt 13.9 stock Join Date: Sep 2010 Location: bay area Posts: 1,473 iTrader: 1 reviews	see if ur maf is connected right mines wasnt n it did this lol i know im an idiot lol __________________ k&n cai, mangaflows exhaust, summit udp's, 24lb injectors, 78mm bbk plenun, tri-ax s/s, a/c delete,3.73's, aluminum drive shaft, upr upper/lower control arms, solid motor mounts, bbk heades, upr xpipe,bbk cc plates, camber bolts.bama tune

November 10th, 2010, 12:01 AM	#5
sstang02 Regular 2002 Mustang Gt 13.4 Join Date: Sep 2010 Location: Chicago, IL Posts: 264 iTrader: 1 reviews	alright thanks guy, ill try this an update tommorow.

November 10th, 2010, 07:20 AM	#8
mrbigjeep I Post Entirely Way Too Much 04 mustang gt 7.21 @ 98 Join Date: Apr 2008 Location: upstate sc Posts: 5,923 iTrader: 1 reviews	if it just happened when you installed the cams then likely that its not back together like it came off...not likely that it would go out RIGHT after you install the cams...possible though... and if it did it would probably be the actual cam syncro and not the sensor itself...my buddies car just did this and it would almost throw you in the windshield feeling like the engine was about to lock up lol...if its the sncro though, you usually have a very noticeable chirping sound... __________________ cams + 150 shot

November 10th, 2010, 11:09 AM	#11
sstang02 Regular 2002 Mustang Gt 13.4 Join Date: Sep 2010 Location: Chicago, IL Posts: 264 iTrader: 1 reviews	UPDATE: i changed out the cam position sensor and nothing happened still jerks and shakes around 38-40mph....ughhh.. the only good thing is that the CEL light went off

November 10th, 2010, 11:13 AM	#12
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	what rpms is this happening at and what cams? __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

November 10th, 2010, 11:18 AM	#14
sstang02 Regular 2002 Mustang Gt 13.4 Join Date: Sep 2010 Location: Chicago, IL Posts: 264 iTrader: 1 reviews	ALSO if i turn off overdrive it stops but i think thats just because it eliminates 4th gear and the rpms go up so could this possibly be my 4:10s or tranny problems?

November 10th, 2010, 11:19 AM	#15
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	well, how bad does it buck and jump? thats pretty low rpms to try and cruise at with a cammed car. Mine doesnt like that low of rpms for sure! __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

November 10th, 2010, 11:20 AM	#16
sstang02 Regular 2002 Mustang Gt 13.4 Join Date: Sep 2010 Location: Chicago, IL Posts: 264 iTrader: 1 reviews	its pretty noticeable but the weird thing is that at any other speed at that rpms its doesnt do it

November 10th, 2010, 11:39 AM	#17
blally89 Regular 2005 Mustang GT Join Date: Jan 2010 Location: MD Posts: 102 iTrader: 0 reviews	honestly even with stock cams I believe you could experience some sort of bucking and jerking with the 4.10 gears at such low rpms.. I experience it somewhat when im in 1st and 2nd gear if my rpms are very low at around 1100rpms and it probably makes it even worse with the cams you have and also depending on the tune that you got with it. Why don't you try to get another tune?

November 10th, 2010, 12:41 PM	#19
BakerFX4 I Post Entirely Way Too Much Join Date: Dec 2007 Location: Louisiana Posts: 16,250 iTrader: 14 reviews	Im thinking its the same for everyone. Mine is noticeable too but i understand that i have cams and cant drive at 1000-1400 rpms and it be too pleasant. __________________ 4.75 MMR 900se Livernois ported heads HP 292s blower cams Procharger D1sc at 20+ psi IW 15% OD pulley (and more bolt ons) E85 Tune/numbers coming shortly!!

November 15th, 2010, 08:27 PM	#20
sstang02 Regular 2002 Mustang Gt 13.4 Join Date: Sep 2010 Location: Chicago, IL Posts: 264 iTrader: 1 reviews	bump...any other opinions?

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