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05-25-2014, 12:32 AM
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#1 |
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Registered User
Join Date: Feb 2014
Location: Evansville
Posts: 121
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Jerking while at cruise speed
No matter what gear I am in the truck wont stay at a constant cruise just jerks like I am goosing the throttle. Any ideas as to what may be causing this?
As always thanks everyone for the feedback. Not sure of exact tranny but has granny 4 speed in it. |
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05-25-2014, 08:29 AM
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#2 |
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Registered User
Join Date: Mar 2012
Location: US
Posts: 446
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Re: Jerking while at cruise speed
Oh, you mean the TRUCK is jerking........
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05-25-2014, 08:34 AM
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#3 | |
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Registered User
Join Date: Jul 2013
Location: Livermore, CO
Posts: 136
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Re: Jerking while at cruise speed
Quote:
By the way, your thread title should win you a POTD award. (post of the day) Good luck...ned.
__________________
'63 C10 long wide; '61 Corvair Lakewood; '74 BMW 2002tii; '89 BMW 325i, '49 Ford 8N |
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05-25-2014, 10:50 AM
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#4 | |
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Registered User
Join Date: Feb 2008
Location: texas gulf coast
Posts: 211
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Re: Jerking while at cruise speed
Quote:
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05-25-2014, 10:59 AM
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#5 |
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Registered User
Join Date: Jul 2013
Location: Portland, Maine
Posts: 219
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Re: Jerking while at cruise speed
It may be too lean at low load.
What it your air fuel ratio? My 350 won't do a light cruise much leaner than 15:1. Any leaner and it jerks. Maybe you have a small vac leak or the floats are too low?
__________________
Daily Driver '66 C10 Fleetside Short Bed - LS swap - 4L80E - Accuair eLevel |
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05-25-2014, 05:41 PM
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#6 |
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meowMEOWmeowMEOW
Join Date: Sep 2009
Location: MKE WI
Posts: 7,128
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Re: Jerking while at cruise speed
Didn't California pass a law against on-road jerking? ..... as well as Assisted On Road Jerking?
__________________
'66 Short Step / SD Tuned / Big Cam LQ4 / Backhalfed /Built 4l80e / #REBUILDEVERYTHING  |
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05-25-2014, 10:51 PM
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#7 |
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Chevy addict
Join Date: May 2012
Location: Iron Ridge, WI
Posts: 1,085
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Re: Jerking while at cruise speed
Possible water in the gas
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05-26-2014, 10:38 AM
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#8 |
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Registered User
 Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,194
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Re: Jerking while at cruise speed
Some engines will run rough at part throttle because of excessive timing. Try driving with the vacuum advance disconnected. If it helps you may have to get an adjustable vacuum chamber & limit the advance.
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05-26-2014, 10:49 AM
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#9 |
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Registered User
 
Join Date: Sep 2006
Location: San Francisco
Posts: 4,779
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Re: Jerking while at cruise speed
Check the fuel filter also. or just replace it.
__________________
"A man and his truck, what a beautiful thing" 65 Short Fleetside BBC 65 Long Fleetside 283 3 on the tree for now. my build thread http://www.67-72chevytrucks.com/vboa...d.php?t=259536 |
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