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09-25-2016, 10:23 PM
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#1 |
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Registered User
Join Date: Feb 2011
Location: OLIVEHURST CA
Posts: 570
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Idles rough in gear
th350 sbc 350 hei, changed plugs wires, cap rotor no change. running carter afb. was running great and then bam. i hit a stop sign and it wants to die. power brakes and parking brake same reaction. idles great in park. again it was running great ,until it didnt.. i wanna believe its someting like a bad tork converter trying to force my tranny to move my rear wheels. any advice is apprecieated
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09-25-2016, 11:28 PM
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#2 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,542
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Re: Idles rough in gear
Check your timing!
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09-26-2016, 12:25 AM
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#3 |
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Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Idles rough in gear
How old is the motor and how many miles on it? It sounds like a vacuum leak, bad carb, or worn out cam. In my case it was a worn out cam.
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09-26-2016, 01:18 AM
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#4 |
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Registered User
Join Date: Oct 2007
Location: Spanaway
Posts: 8,451
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Re: Idles rough in gear
Vacuum leak, timing, air fuel mixture screws, worn out carb. This assumes the compression and cam and timing chain are good. Also if the torque converter is engaging then the idle RPM is too high or possible a bad converter.
Once you can get it to idle, get friend to hold the foot on the brake while in drive and chock the tires, then try and fine tune the air fuel screws to smooth the idle out a bit more.
__________________
Mike. Swamp Rat build thread : http://67-72chevytrucks.com/vboard/s...d.php?t=595019 72 3/4T 4X4 4" BDS Lift 33" BFG's |
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09-26-2016, 04:22 PM
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#5 |
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Registered User
Join Date: Sep 2016
Location: lompoc ca
Posts: 228
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Re: Idles rough in gear
ok guys I DONT KNOW ANYTHING ABOUT AUTOMATIC TRANS. so you might get a chuckle out of this suggestion. Isnt there a vacuum line that goes to tranny modulator or something?I have a sm 465 so i wouldnt know
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09-26-2016, 05:41 PM
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#6 |
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Registered User
Join Date: Apr 2015
Location: East Tn (In the heart of the Smoky Mtns)
Posts: 1,862
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Re: Idles rough in gear
Before you sink a bunch of money into what it might be, get yourself a simple vacuum gauge and hook it up to the right side port on the front of you carb. You'll be amazed how many things you can diagnose with this simple tool. I'm attaching the chart of what the readings will tell you, so good luck.
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09-26-2016, 05:47 PM
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#7 | |
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Registered User
Join Date: Sep 2016
Location: lompoc ca
Posts: 228
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Re: Idles rough in gear
Quote:
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09-26-2016, 05:55 PM
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#8 | |
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Registered User
Join Date: Sep 2016
Location: lompoc ca
Posts: 228
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Re: Idles rough in gear
Quote:
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09-26-2016, 06:04 PM
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#9 |
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Registered User
Join Date: Sep 2016
Location: lompoc ca
Posts: 228
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Re: Idles rough in gear
I am suggesting vacuum leak i always check easy fixes first I have a manual trans so i dont know the answer to this question but isnt there a vacuum line to his tranny? Like i said i wouldnt know because i have a sm 465.
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09-26-2016, 06:08 PM
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#10 |
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Registered User
Join Date: Sep 2016
Location: lompoc ca
Posts: 228
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Re: Idles rough in gear
im sorry about the duplicate posts I have no idea how that happens ill ask one of the kids in the neighborhood
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09-26-2016, 06:18 PM
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#11 | |
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Registered User
 Join Date: Nov 2007
Location: Hermiston, OR
Posts: 947
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Re: Idles rough in gear
Quote:
__________________
Running in place gets you nowhere fast. -me 1968 GTO 4-spd covnvertible 1970 K-20 4-speed, factory AC. |
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