my truck accelerates when i push in the clutch - The 1947 - Present Chevrolet & GMC Truck Message Board Network

mwilliams5891 · 12-16-2010, 02:19 AM

So yeah my 69 c/10 accels. when i push in my clutch and it will go down MOST of the time if i rev the engine...so any help would be nice.

By the way 250 CID with a Holley 390 CFM 4 barrel on it

mwilliams5891 · 12-16-2010, 04:10 AM

anyone know why?

JimKshortstep4x4 · 12-16-2010, 06:18 AM

It sounds like there is some movement of the engine. Can you have someone watch the engine when you depress the clutch?

Jim

70 shorty · 12-16-2010, 08:52 AM

Could possibly the choke and/or fast idle be not completely releasing?

mwilliams5891 · 12-16-2010, 03:43 PM

Quote:

Originally Posted by 70 shorty

Could possibly the choke and/or fast idle be not completely releasing?

that is what i was thinking. since its an electric choke could it just not have enough power?

mwilliams5891 · 12-16-2010, 03:44 PM

Quote:

Originally Posted by JimKshortstep4x4

It sounds like there is some movement of the engine. Can you have someone watch the engine when you depress the clutch?

Jim

so what should i look for exactly? i dont mean to sound like a smart a** just wondering

splehigh · 12-16-2010, 03:50 PM

Watch and see if your motor is rocking side to side when you press the clutch or rev the motor. If it does, you may need new motor mounts.

I'm not sure why the motor would move when you press the clutch though...

mwilliams5891 · 12-16-2010, 03:53 PM

Quote:

Originally Posted by splehigh

Watch and see if your motor is rocking side to side when you press the clutch or rev the motor. If it does, you may need new motor mounts.

I'm not sure why the motor would move when you press the clutch though...

ok will do

mwilliams5891 · 12-16-2010, 05:12 PM

ttt

PanelDeland · 12-16-2010, 05:44 PM

I would suggest you also look at the linkage/cable for the throttle.It could be hung on the clutch linkage.Or the wiring for the electric choke could be shorting on the linkage.A fast idle solenoid could cause this also if it were shorting or maybe misadjusted.

CCCC · 12-16-2010, 05:45 PM

There is minimal info here - and I am not familiar with the inline 6 lever/linkage setup for clutch and accelerator operation, but the first logical thought seems to be that there is some minor interplay between the two. Just a suggestion - observe the under-hood operation of the clutch linkage and see if in its travel it is in some way touching or engaging the accelerator linkage. Hope this helps.

Gobbles · 12-16-2010, 05:48 PM

Quote:

Originally Posted by splehigh

Watch and see if your motor is rocking side to side when you press the clutch or rev the motor. If it does, you may need new motor mounts.

I'm not sure why the motor would move when you press the clutch though...

What do I do if my whole truck shakes

don t. - 72gmc · 12-16-2010, 06:07 PM

Quote:

Originally Posted by Gobbles

What do I do if my whole truck shakes

Play Chuck Berry music(smart a$$ grin).

Allensracing · 12-16-2010, 06:12 PM

is this happening while parked and in neutral with the foot off the accelerator pedal completely?

mwilliams5891 · 12-16-2010, 07:18 PM

Quote:

Originally Posted by Allensracing

is this happening while parked and in neutral with the foot off the accelerator pedal completely?

yes this will happen if i stop at a stop sign or im slowing down to stop or pretty much anytime i engage the clutch.

mwilliams5891 · 12-16-2010, 07:20 PM

Quote:

Originally Posted by CCCC

There is minimal info here - and I am not familiar with the inline 6 lever/linkage setup for clutch and accelerator operation, but the first logical thought seems to be that there is some minor interplay between the two. Just a suggestion - observe the under-hood operation of the clutch linkage and see if in its travel it is in some way touching or engaging the accelerator linkage. Hope this helps.

I will observe but I am almost 100% nothing is touching or anything like that. i could be wrong but i am pretty sure.

what kind of info do you guys need? I really said everything that happens...so I dont know what else to provide so you guys can help me sort out this problem

mwilliams5891 · 12-16-2010, 07:20 PM

Quote:

Originally Posted by PanelDeland

I would suggest you also look at the linkage/cable for the throttle.It could be hung on the clutch linkage.Or the wiring for the electric choke could be shorting on the linkage.A fast idle solenoid could cause this also if it were shorting or maybe misadjusted.

what does a fast idle solenoid look like?

Allensracing · 12-16-2010, 07:21 PM

here is what I would like you to try. park the truck. hold your foot on the brake. put the truck in neutral. push the clutch in and let it out. does the RPM change when you do this?

mwilliams5891 · 12-16-2010, 07:24 PM

Quote:

Originally Posted by Allensracing

here is what I would like you to try. park the truck. hold your foot on the brake. put the truck in neutral. push the clutch in and let it out. does the RPM change when you do this?

I will go do that right now

I love laptops

BAGNDRAGIT · 12-16-2010, 07:28 PM

what is the most recent repair right BEFORE this issue started?

is your carb adjusted properly, possibly when you release the load of the drivetrain via the clutch you are letting the motor return to its set idle speed... just a thought.

cleszkie · 12-16-2010, 08:42 PM

I had a similar problem in an old jeep I had. Every time the engine was under and increased load (rolled up to a rock or log), the engine rpm would go up. Push in the clutch and rpms would drop off. Turned out to be wasted engine mounts. When the engine was under load, it twisted in the mounts. This would stretch the throttle cable between the carb and firewall, opening the throttle plates and stroking the accelerator pump. Check your mounts.

splehigh · 12-17-2010, 08:15 AM

Quote:

Originally Posted by don t. - 72gmc

Play Chuck Berry music(smart a$$ grin).

LOL

dadsworktruck · 12-17-2010, 10:54 AM

Check the bellhousing bolts, make sure all of them are tight so that the engine don't move foward as the clucth is being depressed, wouldnt take much to affect the 69's rod style throttle arrangement..just a thought...

12-16-2010, 02:19 AM	#1
mwilliams5891 Registered User Join Date: Aug 2010 Location: Springfield, Oregon Posts: 164	my truck accelerates when i push in the clutch So yeah my 69 c/10 accels. when i push in my clutch and it will go down MOST of the time if i rev the engine...so any help would be nice. By the way 250 CID with a Holley 390 CFM 4 barrel on it __________________ -1969 C/10 Short Step soon to be Brand NEW Ls6/T56 -03 Mazda Protege 5 -WTB 1970 Chevelle project Last edited by mwilliams5891; 12-16-2010 at 02:19 AM.

12-16-2010, 04:10 AM	#2
mwilliams5891 Registered User Join Date: Aug 2010 Location: Springfield, Oregon Posts: 164	Re: my truck accelerates when i push in the clutch anyone know why? __________________ -1969 C/10 Short Step soon to be Brand NEW Ls6/T56 -03 Mazda Protege 5 -WTB 1970 Chevelle project

12-16-2010, 06:18 AM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	Re: my truck accelerates when i push in the clutch It sounds like there is some movement of the engine. Can you have someone watch the engine when you depress the clutch? Jim __________________ 1971 Shortbox step side 4x4, 350 sbc, 3:07 rear end 1965 Impala SS 400 sbc, Muncie rock crusher 1966 Impala SS 396 bbc, TH 400 1969 El Camino, 350 sbc, TH 350 1971 Snowplow built on a Blazer frame 1972 GMC Short bed, stepside, TH 400, 427 BBC

12-16-2010, 08:52 AM	#4
70 shorty Where's my beer? Join Date: Oct 2004 Location: Glen Allen, VA Posts: 1,772	Re: my truck accelerates when i push in the clutch Could possibly the choke and/or fast idle be not completely releasing? __________________ 70 C10, shortstep, .30 over 250,Hurst shifted 3 spd parts hauler. Holley 390, Clifford Intake, Header, ported cylinder head, unknown bigger cam. 79 Corvette L82, 4 spd, black, red interior, headers, flowmasters, and unkown bigger cam. '03 Grand Cherokee Laredo, 4.0 4x4 daily driver. 165K miles, and runs great '08 Tahoe LTZ 4x4 155K

12-16-2010, 03:50 PM	#7
splehigh Registered User Join Date: Nov 2008 Location: Glenville, Pa Posts: 445	Re: my truck accelerates when i push in the clutch Watch and see if your motor is rocking side to side when you press the clutch or rev the motor. If it does, you may need new motor mounts. I'm not sure why the motor would move when you press the clutch though... __________________ http://67-72chevytrucks.com/vboard/s...d.php?t=355153

12-16-2010, 05:12 PM	#9
mwilliams5891 Registered User Join Date: Aug 2010 Location: Springfield, Oregon Posts: 164	Re: my truck accelerates when i push in the clutch ttt __________________ -1969 C/10 Short Step soon to be Brand NEW Ls6/T56 -03 Mazda Protege 5 -WTB 1970 Chevelle project

12-16-2010, 05:44 PM	#10
PanelDeland I am a Referee of life. Join Date: Jun 2000 Location: Greensboro N.C. Posts: 13,992	Re: my truck accelerates when i push in the clutch I would suggest you also look at the linkage/cable for the throttle.It could be hung on the clutch linkage.Or the wiring for the electric choke could be shorting on the linkage.A fast idle solenoid could cause this also if it were shorting or maybe misadjusted. __________________ The 47-present Chevrolet and GMC Truck Message Board Network,it's owners,moderators,members,and associates of any type should not be held responsible for my opinion. You can't fix stupid,not even with duct tape. "My appearance is due to the fact that "GOD" does punish you for having too much fun!" Barrett-Jackson has perfected alchemy,they make rust into gold! "You can lead a horse to water but you can't saddle a duck" "Cleverly disguised as a 'Responsible Adult' "Sometimes your Knight in shining armor is just a retard in tinfoil"

12-16-2010, 05:45 PM	#11
CCCC Registered User Join Date: Mar 2007 Location: San Pedro River, SE Arizona Posts: 734	Re: my truck accelerates when i push in the clutch There is minimal info here - and I am not familiar with the inline 6 lever/linkage setup for clutch and accelerator operation, but the first logical thought seems to be that there is some minor interplay between the two. Just a suggestion - observe the under-hood operation of the clutch linkage and see if in its travel it is in some way touching or engaging the accelerator linkage. Hope this helps. __________________ CCCC 67 Sting Ray Coupe 327 4sp; 68 K10 Suburban 327 4sp; 69 K20 Lifted 383 4sp; 69 C80 Fire Truck 478 V6 5sp/2sp; 69 C20 Longhorn 327 4sp; 70 C30 Wrecker 350 4sp; 70 C30 Flat Bed 350 4sp; 71 C20 LWB 350 4sp; 72 K5 Blazer 350 4sp; 72 C30 Flat Bed Gooseneck Hauler with sleeper 350/TH400; 72 C20 Longhorn 402 4sp; 52 Mack LTL Supercharged Cummins 5sp x 3sp; 01 Dodge 5.9 HO Cummins 6spd; 02 Safari Trek 2430 8.1 Vortec on Workhorse Chassis; 03 Silverado 2500 HD 4wd Duramax/Allison Moved but still in the family 70 C20 Custom Camper 350/TH350; 72 K5 Blazer CST Highlander 350/TH350 Recently sent to new homes 72 C30 MoHome 402 4sp; 72 K5 Blazer Conv 350 4sp; 75 GMC 6000 Aerial 350 w Allison; 72 GMC 3500 Utility 350 4sp; 70 GMC 3500, 350 4sp

12-16-2010, 06:12 PM	#14
Allensracing Registered User Join Date: Dec 2010 Location: Paradise, ca Posts: 295	Re: my truck accelerates when i push in the clutch is this happening while parked and in neutral with the foot off the accelerator pedal completely? __________________

12-16-2010, 07:21 PM	#18
Allensracing Registered User Join Date: Dec 2010 Location: Paradise, ca Posts: 295	Re: my truck accelerates when i push in the clutch here is what I would like you to try. park the truck. hold your foot on the brake. put the truck in neutral. push the clutch in and let it out. does the RPM change when you do this? __________________

12-16-2010, 07:28 PM	#20
BAGNDRAGIT Just Not Low Enough! Join Date: Mar 2009 Location: Phoenix, AZ Posts: 525	Re: my truck accelerates when i push in the clutch what is the most recent repair right BEFORE this issue started? is your carb adjusted properly, possibly when you release the load of the drivetrain via the clutch you are letting the motor return to its set idle speed... just a thought. __________________ NEED ELECTRICAL HELP? ASK ME! 67-72 Full Wiring Diagrams Lots Of Info, TAKE A LOOK 1967 Chevy C-10 Shortbox Bagged 327 4spd Previous: 1971 Chevy C-10 Short Sep I6 Auto (Traded) 1973 Chevy C-20 THE REDNECK BATTLE TRUCK 2001 Chevy Silverado 2Dr 5.3L Shortbox. R.I.P. 1969 Volkswagen Bug This is my first meeting, I have a horsepower problem.

12-16-2010, 08:42 PM	#21
cleszkie Registered User Join Date: Feb 2003 Location: Santa Ana, CA Posts: 2,191	Re: my truck accelerates when i push in the clutch I had a similar problem in an old jeep I had. Every time the engine was under and increased load (rolled up to a rock or log), the engine rpm would go up. Push in the clutch and rpms would drop off. Turned out to be wasted engine mounts. When the engine was under load, it twisted in the mounts. This would stretch the throttle cable between the carb and firewall, opening the throttle plates and stroking the accelerator pump. Check your mounts.

12-17-2010, 10:54 AM	#23
dadsworktruck Registered User Join Date: Jul 2009 Location: blacksburg,s.c. Posts: 155	Re: my truck accelerates when i push in the clutch Check the bellhousing bolts, make sure all of them are tight so that the engine don't move foward as the clucth is being depressed, wouldnt take much to affect the 69's rod style throttle arrangement..just a thought...



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