Car bucks and jumps forward

moneygreenstang · November 16th, 2010, 02:44 AM

cruise at higher rpms

sharkbait · November 16th, 2010, 02:54 AM

If your cars an auto they all do that....

mine does it..

6Stang99 · November 16th, 2010, 07:00 AM

Try cruising at higher rpm's. I know some cams don't like cruising at low rpm's at all and will buck pretty good until you give it some gas. My old Mustang was like that. If I was trying to cruise in 3rd at about 30 mph and low rpm it would buck like crazy. I'd either give it some gas and bump up to about 35 or go to 2nd gear and just cruise at a higher rpm.

Trick Tuners · November 16th, 2010, 12:47 PM

A mild shuffle could be normal at those low rpms, but if its bucking where the nose of the car will rise or dip, then its probably the tune. There is a lot that you can do in the tune to make the car drive smoother, even with huge cams.

blownstang · November 16th, 2010, 12:53 PM

Originally Posted by sstang02

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?

^This. Have your tuner bump the load a little. Mine would do it in 5th gear on the highway at around 1500rpms. It's cause your foot is just lightly on the pedal and the injectors shut on and off really quickly causing a jerk. Have your tuner bump the load up a little in the tune and see if it corrects the issue.

sstang02 · April 2nd, 2011, 12:28 AM

UPDATE: Hey everyone i took my car out of storage for the winter recently and i changed my fuel filter, cleaned my MAF, cleaned my throttle body, and cleaned the IAC. The car still bucks pretty hard at around 1400rpms. I plugged in my predator handheld and i didnt see an option for load. I noticed though he did change spark advance and fuel. Someone said to me i try changing plugs and injectors but before i do i was wondering if anyone knew how i could bump up the load a little. Thanks

blownstang · April 2nd, 2011, 11:18 AM

Originally Posted by sstang02

UPDATE: Hey everyone i took my car out of storage for the winter recently and i changed my fuel filter, cleaned my MAF, cleaned my throttle body, and cleaned the IAC. The car still bucks pretty hard at around 1400rpms. I plugged in my predator handheld and i didnt see an option for load. I noticed though he did change spark advance and fuel. Someone said to me i try changing plugs and injectors but before i do i was wondering if anyone knew how i could bump up the load a little. Thanks

You can't change the load on the handheld. Your tuner (as in the physical person) has to email you a tune with the adjustment.

November 16th, 2010, 02:44 AM	#21
moneygreenstang Enthusiast 2001 Mustang GT Join Date: Jun 2008 Location: Florida Posts: 722 iTrader: 2 reviews	cruise at higher rpms __________________ 01 GT Vert - Triple Black - 2v 5.4 270/340 00 Lightning - Triple Black - 2v SC 5.4 400/500 Brand New Tubular UCA and LCA set for sale PM me Slightly Used 05-09 Halo Headlights for sale PM me

November 16th, 2010, 02:54 AM	#22
sharkbait Hooo Ha Ha 1997 Mustang GT 11.65 @ 115 Join Date: Apr 2009 Location: Pasadena MD Posts: 9,743 iTrader: 10 reviews	If your cars an auto they all do that.... mine does it.. __________________ 410rwhp 520rwtq @ 12.9 psi

November 16th, 2010, 07:00 AM	#23
6Stang99 Hardcore Enthusiast 2000 Jeep Grand Cherokee Join Date: Apr 2010 Location: West Milford, NJ Posts: 1,202 iTrader: 2 reviews	Try cruising at higher rpm's. I know some cams don't like cruising at low rpm's at all and will buck pretty good until you give it some gas. My old Mustang was like that. If I was trying to cruise in 3rd at about 30 mph and low rpm it would buck like crazy. I'd either give it some gas and bump up to about 35 or go to 2nd gear and just cruise at a higher rpm. __________________ Cammed '99 Mustang V6 -- Sold Supercharged '89 Hatch -- Sold Looking for a project Stang now... MILITARY CREW - TERMINAL LANCE - MARINE CORPS. INFANTRY www.wotmustangs.com

November 16th, 2010, 12:47 PM	#24
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	A mild shuffle could be normal at those low rpms, but if its bucking where the nose of the car will rise or dip, then its probably the tune. There is a lot that you can do in the tune to make the car drive smoother, even with huge cams. __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

April 2nd, 2011, 12:28 AM	#26
sstang02 Regular 2002 Mustang Gt 13.4 Join Date: Sep 2010 Location: Chicago, IL Posts: 264 iTrader: 1 reviews	UPDATE: Hey everyone i took my car out of storage for the winter recently and i changed my fuel filter, cleaned my MAF, cleaned my throttle body, and cleaned the IAC. The car still bucks pretty hard at around 1400rpms. I plugged in my predator handheld and i didnt see an option for load. I noticed though he did change spark advance and fuel. Someone said to me i try changing plugs and injectors but before i do i was wondering if anyone knew how i could bump up the load a little. Thanks __________________ 2002 Mustang Gt Comp Cams XE268H, Accufab Throttle Body, Accufab Upper Plenium, Steeda UP Pullies, K&N Cold Air Intake, 4:10 Gears, HHR Drag Launch Springs, BBK O/R X Pipe to Magnaflow exhaust, Tuned By: Dyno TuneMP. ~274RWHP 296TQ~

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