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05-06-2013, 06:53 PM
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#1
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Bucking and Hesitating in gear
86 Trans am with a 350 crate motor, and auto trans. Stumbles and hesitated in gear, fine at idle but as soon as you put load on it, it starts running like crap. Started running crappy, and checked the plugs, one of the wires was burnt. Replaced the plugs, cap, and rotor and it didnt fix it. Checked the firing order and made sure all the plugs were seated, also checked the timing all was good. Noticed that that carb gasket didn't completely cover the base of the carb and that some of the passages were exposed near the mixture screws, replaced the carb gasket, same issue. Replaced the carb with a known good one, same issue. So Im at a loss, Im not good with these older cars, the only thing I could think is the cat is clogged since you can smell the cat burning after WOT so thats my next step. Any suggestions since after that I have no clue what the issue could be. I ordered stock plugs and they were colder then the plugs that were in there idk if that makes a difference, they are also gapped at .040. Also it has good vacuum until you put a load on the motor, also with a load on the motor and the primaries blocked (via shirt over the carb) it kept running and pulled 20in of vacuum, even ran beter.
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01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
Last edited by B4C; 05-06-2013 at 06:57 PM.
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05-06-2013, 07:11 PM
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#2
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,896
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Sounds like another car that someone was posting about, I think the PCM and lock up function was to blame? Some one hacked in a lock up switch to remove the PCM functions or something
Hows the trans fluid look like?
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Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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05-06-2013, 07:25 PM
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#3
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Stalker
Join Date: Aug 2004
Posts: 12,077
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ecm still running the carb dizzy and trans? if not, start there.
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05-06-2013, 07:43 PM
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#4
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Quote:
Originally Posted by LTb1ow
Sounds like another car that someone was posting about, I think the PCM and lock up function was to blame? Some one hacked in a lock up switch to remove the PCM functions or something
Hows the trans fluid look like?
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The lockup function was bypassed and is now manually controlled via on off switch. Havnt checked the trans fluid I should probably do that.
Quote:
Originally Posted by V
ecm still running the carb dizzy and trans? if not, start there.
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ECM has been disconnected, non computer controlled carb, and hei dizzy (which is only about a year old). As far as the trans Im unsure.
As soon as you put the car in gear from park it runs like crap.
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01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
Last edited by B4C; 05-06-2013 at 07:44 PM.
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05-06-2013, 07:56 PM
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#5
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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What's the timing amount and curve? Any vacuum advance?
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05-06-2013, 08:38 PM
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#6
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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what brand distributor?
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Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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05-07-2013, 11:42 AM
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#7
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Quote:
Originally Posted by WildBillyT
What's the timing amount and curve? Any vacuum advance?
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I think it was like 16* Advanced, but if you turn the distributor either way it runs alot crappier. Curve idk how to read that, it has a vacuum advance on the distributor idk if it works.
Quote:
Originally Posted by BonzoHansen
what brand distributor?
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I want to say msd because the cap is red but theres no markings on it.
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01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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05-07-2013, 11:49 AM
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#8
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Admin.
Join Date: Aug 2005
Location: Hamilton, NJ
Posts: 20,149
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i bet it's an accel, the one they sell as their hei replacement has a red cap - and it is extreme junk. check the connector from the pickup coil to the module and see if it is loose.
__________________
Vent Windows Forever!
The looser the waistband, the deeper the quicksand. Or so I have read.
Feather-light suspension, Konis just couldn't hold. I'm so glad I took a look inside your showroom doors.
Hey everybody, it's good to have you on the Baba-too-da-ba-too-ba-ba-buh-doo-ga-ga-bop-a-dop
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05-07-2013, 01:07 PM
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#9
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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^ This, if it's an Accel dizzy be wary.
Just to be clear, it doesn't have any PCM/ECM stuff anymore and it's a standard carb/distributor setup?
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05-07-2013, 07:33 PM
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#10
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Quote:
Originally Posted by BonzoHansen
i bet it's an accel, the one they sell as their hei replacement has a red cap - and it is extreme junk. check the connector from the pickup coil to the module and see if it is loose.
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Ive had one sitting new in the box for like 5 years and it has a brown/tan cap. Is that the black sensor under the rotor?
This one was installed by a shop that shall remain nameless, and no recite was given for work done at the time so Im unsure of brand.
Edit, it is an accel, I have a gm unit Ill try swapping in.
Quote:
Originally Posted by WildBillyT
^ This, if it's an Accel dizzy be wary.
Just to be clear, it doesn't have any PCM/ECM stuff anymore and it's a standard carb/distributor setup?
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No pcm/ecm, trans I dont know but motor wise nothing edlebrock (quadrajunk) carb and hei dizzy.
__________________
01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
Last edited by B4C; 05-07-2013 at 07:49 PM.
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05-07-2013, 07:55 PM
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#11
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Join Date: Jun 2011
Location: Voorhees Nj
Posts: 217
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Quote:
Originally Posted by WildBillyT
^ This, if it's an Accel dizzy be wary.
Just to be clear, it doesn't have any PCM/ECM stuff anymore and it's a standard carb/distributor setup?
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car originally was a computer controlled carb car..when the engine swap was done..the previous owner put a manual carb on it. I was told it was 30 degrees advanced when i got it. It has since been been having charging issues under load..and it seems it starts to lose power..lights dim and such while under load..and the car is idling rather low at about 300-400 rpm. Car ran ok unless i had the ac on..but recently its really running awful, to almost undrive-able condition..
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
1989 Formula
1986 T/A
Attempting to race old junk since 2009 
~Jamie
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05-07-2013, 10:10 PM
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#12
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Mongo the Meet Coordinator
Join Date: May 2008
Posts: 16,896
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Whose car is this thread about..?
__________________
Quote:
Originally Posted by KirkEvil
repo bigals turd gen and part it out to a loving home
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05-07-2013, 10:14 PM
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#13
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Quote:
Originally Posted by LTb1ow
Whose car is this thread about..?
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Hers, Im working on it.
__________________
01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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05-08-2013, 07:56 AM
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#14
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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Quote:
Originally Posted by B4C
I think it was like 16* Advanced, but if you turn the distributor either way it runs alot crappier. Curve idk how to read that, it has a vacuum advance on the distributor idk if it works.
I want to say msd because the cap is red but theres no markings on it.
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The first place to start is the distributor.
Find out exactly how much initial timing is set. Do not forget to disconnect the vacuum advance when you do so. Then rev the motor and find out how much total timing you have, also with the vacuum advance disconnected. Make note of the RPM where full mechanical advance comes in.
You need to figure out where you are at before you can attempt to fix anything. Change one thing at a time.
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05-08-2013, 11:04 AM
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#15
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BadMod
Join Date: Aug 2004
Location: hamilton, nj
Posts: 8,889
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How many threads does one broken car need?
__________________
So much stupid, so little time.
Quote:
Originally Posted by 79CamaroDiva
It started before I drove your car. I just have to look at it the wrong way and your car poops parts.
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Mercerville MotorSports, LLC
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05-08-2013, 12:43 PM
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#16
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Quote:
Originally Posted by Mike
How many threads does one broken car need?
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Theres only one for the current issue?
__________________
01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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05-08-2013, 12:57 PM
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#17
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BadMod
Join Date: Aug 2004
Location: hamilton, nj
Posts: 8,889
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So one of the old ones can't be updated? When it needs another engine will that be another thread?
__________________
So much stupid, so little time.
Quote:
Originally Posted by 79CamaroDiva
It started before I drove your car. I just have to look at it the wrong way and your car poops parts.
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Mercerville MotorSports, LLC
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05-08-2013, 01:46 PM
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#18
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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That wasnt for this car.
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01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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05-08-2013, 01:49 PM
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#19
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BadMod
Join Date: Aug 2004
Location: hamilton, nj
Posts: 8,889
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Wow. Didn't realize they were both so full of gremlins
__________________
So much stupid, so little time.
Quote:
Originally Posted by 79CamaroDiva
It started before I drove your car. I just have to look at it the wrong way and your car poops parts.
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Mercerville MotorSports, LLC
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05-08-2013, 03:32 PM
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#20
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BadMod
Join Date: Aug 2004
Location: hamilton, nj
Posts: 8,889
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Has either car been professionally diagnosed or looked at? Kind of seems like they are both at a point of diminishing returns and losses should be cut and ge them into a shop just to stop the bleeding of money
__________________
So much stupid, so little time.
Quote:
Originally Posted by 79CamaroDiva
It started before I drove your car. I just have to look at it the wrong way and your car poops parts.
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Mercerville MotorSports, LLC
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05-08-2013, 04:16 PM
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#21
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Quote:
Originally Posted by Mike
Has either car been professionally diagnosed or looked at? Kind of seems like they are both at a point of diminishing returns and losses should be cut and ge them into a shop just to stop the bleeding of money
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I havnt really been throwing any money at them. Cap, rotor, plugs, wires, and carb gasket are all ive put on it. It was about due for a tuneup anyways and had a melted plug wire. The rest of the parts I have laying around the garage.
__________________
01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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05-08-2013, 05:08 PM
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#22
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BadMod
Join Date: Aug 2004
Location: hamilton, nj
Posts: 8,889
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There is a finite number of things it can be. Have you changed the things so mundane as the fuel filter?
__________________
So much stupid, so little time.
Quote:
Originally Posted by 79CamaroDiva
It started before I drove your car. I just have to look at it the wrong way and your car poops parts.
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Mercerville MotorSports, LLC
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05-08-2013, 05:20 PM
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#23
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Quote:
Originally Posted by Mike
There is a finite number of things it can be. Have you changed the things so mundane as the fuel filter?
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When I used the other carb I removed the fuel filter and ran it, no change.
__________________
01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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05-08-2013, 05:31 PM
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#24
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Ayatollah of Rock N Rolla / Admin
Join Date: Mar 2006
Location: Parts Unknown
Posts: 12,573
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What was the other carb?
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05-08-2013, 06:05 PM
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#25
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Join Date: May 2007
Location: Jim Thorpe PA
Posts: 2,132
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Quote:
Originally Posted by WildBillyT
What was the other carb?
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Same thing qudrajet just a gm one not edelbrock
__________________
01 SS 383 stroker, Magnum F, 9in.
86 Trans-Am 355 t56
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