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Bucking while in low rpm in 1st gear

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15 replies to this topic

#1 icarpejugulum

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Posted 29 February 2012 - 12:54 AM

My Boss has 5,000 miles. Been running it hard to break in. at about 2,500 miles in, the car would buck and surge forward two or three times until I reengage clutch or just get it out of 1st. Some say it's a weird issue that could mean a faulty MAF or some other reason for it running lean. Gas is consistent 91 octane. Others say it's clutch related. My clutch has had issues dropping to floor at high rpms and difficulty getting into a different gear. Feels like I'm locked out. Lockout goes away after rpms lower and I can place into gear, but for a minute or so thereafter the clutch never travels back up to normal position after engagement.

I've been running it hard, clutching properly etc. It happens to infrequently, that my dealer can't help since he can't personally observe it. When I took it in for oil service, neither issue displayed and I just drove home and given promise to fix once a tech can see the issue in action.

I suspected the clutch spring might be off because every once in a while I'll be in 3rd gear (let's say) and it will suddenly feel like the clutch is fully engaged and I seem to have sportier power. Difficult to explain to dealer, but that's the best I got.

Any thoughts on the cause?






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#2 302 Hi Pro

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Posted 29 February 2012 - 07:07 AM

My Boss has 5,000 miles. Been running it hard to break in. at about 2,500 miles in, the car would buck and surge forward two or three times until I reengage clutch or just get it out of 1st. Some say it's a weird issue that could mean a faulty MAF or some other reason for it running lean. Gas is consistent 91 octane. Others say it's clutch related. My clutch has had issues dropping to floor at high rpms and difficulty getting into a different gear. Feels like I'm locked out. Lockout goes away after rpms lower and I can place into gear, but for a minute or so thereafter the clutch never travels back up to normal position after engagement.

I've been running it hard, clutching properly etc. It happens to infrequently, that my dealer can't help since he can't personally observe it. When I took it in for oil service, neither issue displayed and I just drove home and given promise to fix once a tech can see the issue in action.

I suspected the clutch spring might be off because every once in a while I'll be in 3rd gear (let's say) and it will suddenly feel like the clutch is fully engaged and I seem to have sportier power. Difficult to explain to dealer, but that's the best I got.

Any thoughts on the cause?


icarpejugulum: Here is something to think about, from what you have explained, it sounds to me, as though you may have two (3) separate problems. First, you mentioned the Clutch Pedal sticks to the floor, I believe I have read a TSB for this exact problem, and there is a fix documented for this condition. However, there was supposed to be a production fix for this condition in cars built after a certain date, so I am surprised to learn of a 2012 with this condition, as it was first related to 2011 5.0L GT vehicles. You can search for the TSB regarding "Clutch Pedal Sticks To Floor, High RPM Shifts"

Next; is the "feels like I'm locked out of gear" [sic], I have this same problem and I have no suggestions, nor does my dealer. My car is going into the shop tomorrow, so mybe they will find something.

Last: Bucking and surging in first gear: I have not had this problem, perhaps as the weather warms up more forum members will be driving their cars and can share more information. Please keep us all posted as to the progress you make in finding the cause of these items. Thank you, - Hi Pro
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#3 Bad Boss 302

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Posted 04 March 2012 - 01:17 PM

I think I know what the bucking in 1st gear is about. There is a fair amount of gear lash in the rear differential. You can test this yourself by jacking up the rear of the car until you can slide under. With the tranny in neutral and the parking brake engaged, grab hold of the driveshaft and turn it back and forth. It will clunk at each extreme. This clunking noise is amplified through the hollow driveshaft. I mostly hear and feel this clunking when the car is cold when I pull out in the morning. I think you will hear and feel this more under very light acceleration. I rarely use 1st gear anymore. I generally start out in 2nd gear.

Hope this helps,

Dave



 

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#4 SeanL

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Posted 23 May 2012 - 09:10 AM

I have not had consistant bucking in first, but I notice that if I take off too soon after a cold start I get bucking. Once it caused unintented acceleration for a brief moment in a parking lot. That was scary as hell! Now I don't interrupt the raised rpm warmup that the car does. You can get the rpms to settle if you blip the gas after she starts, but it won't run right for a minute if you do.

#5 LSECO

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Posted 23 May 2012 - 05:20 PM

Bucking is just that - like a bronco that's a little out of control. May be a new car thing. Break her in slowly and gently to stop that bucking.

I have not had consistant bucking in first, but I notice that if I take off too soon after a cold start I get bucking. Once it caused unintented acceleration for a brief moment in a parking lot. That was scary as hell! Now I don't interrupt the raised rpm warmup that the car does. You can get the rpms to settle if you blip the gas after she starts, but it won't run right for a minute if you do.


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#6 quahogboss

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Posted 28 May 2012 - 04:42 AM

The Boss I was driving at track attack was bucking(surging) like crazy, Had to push in clutch and go to next higher gear, that seemed to correct it.

#7 JeffIsHereToo

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Posted 28 May 2012 - 11:06 AM

Both my 2013 and my friend's 2012 LS do this in first gear. In fact she drove my car just today and when she picked me up also commented on how they hadn't fixed what ever the issue is. There are also other Boss owners who have commented on this annoyance in other forums. I can get the car to do it if in first and then let off the gas and it will start surging as if to get the revs up. It did this before and after the new 12/13 track software so that isn't the cause or the cure. Now that I know what can trigger it I've found I can anticipate and avoid it most of the time.
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#8 Fastoldman

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Posted 05 June 2012 - 04:53 PM

Like Sean L , I have this condition when cold. Once warmed up it seems to disappear. It is a long legged car, and have driven many other models that exhibit a bit of this nature, as they just don't want to go Slowwwww !

#9 sadil

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Posted 05 June 2012 - 06:36 PM

My car bucks in every gear if the rpm is low enough, I usually cruise in 3rd on the highway in traffic, and the car feels like its choking. I don't know if this is the best thing to do, but the first two gears rev up too high for traffic driving at 45-50km/h. The bucking right when the car is on is present in my car too, but when I let the car warm up properly, the gears are smoother.
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#10 bossjz

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Posted 21 June 2012 - 06:02 PM

i have bucking too, more on the track key though

#11 Dvendet

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Posted 22 December 2012 - 06:55 PM

I have experienced this condition on three occasions. It occured when 1) the car was not fully warmed up, 2) I was in 2nd gear and I was approaching a stop sign, and 3) I just lifted my right foot off the accelerator, while at the same time I was just beginning to apply the clutch (so I could coast to the stop sign). All 3 occurences happened under these circumstances. However, I am not able to recreate this surge condition evey time I do this. It was quite unnerving the first time I did this. When I fully depressed the clutch (on my 13 LS), the acceleration subsided. I have not discussed this issue with my Ford dealer as I cannot recreate this condiion when I try too. I have not seen this surge in any other gear and it only occured when the car engine was not fully warmed up. Probably relates to the engine PCM software. dvendet
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#12 Lars

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Posted 22 December 2012 - 08:16 PM

I live on a hill and when the car is cold, and I'm going down the hill without even having my foot on the gas, the car will surge.  It can be a little scary.



#13 mustang_girl

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Posted 22 December 2012 - 09:39 PM

This is definitely a common issue when the car is cold.  Upshifting usually takes care of it for me...



#14 kevin

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Posted 23 December 2012 - 08:44 AM

The  bucking only happens to my car when I first start out. I let it warm up a little more now and try to keep the rpm's up for a block or two then no bucking.I try to prevent it: It can't be good for the drivetrain.



#15 Rich B.

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Posted 25 December 2012 - 08:58 AM

Almost sounds like a fuel enrichment issue bucking when the engine is cold. Corvettes had a 9th fuel injector in the intake plenum for this; don't know if the Boss' do or not. Need the factory manuals for these cars. May have linkage slightly out of sync and starting in a higher gear than thought (have had this issue).

Edited by Rich B., 25 December 2012 - 09:01 AM.


#16 dabossinne

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Posted 25 December 2012 - 08:51 PM

I think I know what the bucking in 1st gear is about. There is a fair amount of gear lash in the rear differential. You can test this yourself by jacking up the rear of the car until you can slide under. With the tranny in neutral and the parking brake engaged, grab hold of the driveshaft and turn it back and forth. It will clunk at each extreme. This clunking noise is amplified through the hollow driveshaft. I mostly hear and feel this clunking when the car is cold when I pull out in the morning. I think you will hear and feel this more under very light acceleration. I rarely use 1st gear anymore. I generally start out in 2nd gear.

Hope this helps,

Dave

BadBoss 302 is right... it's excessive driveline lash caused by a combination of: relatively compliant engine and trans mounts + 2 piece driveshaft w/ DS isolation bearing mounted in a soft rubber donut, which were all done for NVH reduction purposes. My Boss does this too sometimes in 1st gear... shifting to (or starting out in) 2nd gear usually takes care of it.

 

My last car, a '96 Porsche 993, did the same thing in 1st gear, and it was basically the same problem... excessive driveline lash mostly caused by the stock soft rubber engine and trans mounts. When I swapped out the stock mounts to aftermarket hard urethane mounts it went away. Suspect going to a 1 piece DS plus stiffer engine and/or trans mounts, would go a long way toward eliminating this problem in the Boss.


Edited by dabossinne, 25 December 2012 - 09:13 PM.

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