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Username Post: weird problem with my 350        (Topic#360404)
orange82chevy 
Newbie
Posts: 9

Reg: 04-05-20
04-05-20 09:44 AM - Post#2790372    

i have a 1982 chevy c10 with a 350 engine the problem i am having is it runs good but say if i go out in stop and go traffic or if im on the highway for about 20 minutes and come to a stop and go to accelerate the truck sputters and hesitates. lets say i go to my buddys house whitch is 10 minutes away no traffic runs good snappy throttle response. the motor has plenty of power i ran 12.75 in the quarter mile. this is my first post and any help would be appreciated. the work thats been done to the truck is
1970 350 rebuilt 10.25-1 compression
brodix ik180 heads
comp xe256 cam and lifter kit
weiand speed warrior intake manifold
edelbrock 650 avs2 carburetor
summit racing ceramic coated long tube headers
dual 2 1/2 exhaust with cherrybomb extreme mufflers
comp cams 1.52 rato roller tip rockers
stock th350 transmission
stock stall converter
the only thing done to the tranny is i modified the governor to shift at 5500 rpm at wot
gm 10 bolt rear
richmond 3.90 gears
auburn limited slip carrier
the truck weight 3300 pounds with me in it i took alot of stuff off barebone truck no heat no ac no power steering no tailgate short bed truck
timing set at 36 degrees at 3000 rpm
i got 18 inches of mercury at 750 rpm
compression test show 185 psi on all cylinders
give or take 1 psi





 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25138
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-05-20 12:19 PM - Post#2790381    
    In response to orange82chevy

Welcome to the site. One thing not mentioned is cooling. Are there any modifications to the cooling system? What type of fuel filter is installed? Is engine idle higher or lower when it acts up? What is timing at idle?

What kind of governor changes are installed? Are you running a vette governor? Are weights changed or modified from stock? My 700R4 needs a better WOT governor. Shifts are too low.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
orange82chevy 
Newbie
Posts: 9

Reg: 04-05-20
04-05-20 03:54 PM - Post#2790397    
    In response to gchemist

my idle stays normal it idles at 550 rpm in drive
the truck runs at 185 degrees never gets past 195 when driven hard
my timing at idle is 12 degrees initial
i bought a bandm governor recalibration kit and changed the weights and springs to change my shift points. the truck runs good.another example of my problem is if i leave to go to work in the morning i start it up let it warm up for for 15 minutes get in leave my house drive on a mile long back road stop at a stop sign everything is still good.acclerate on to the highway travel 2 miles on the highway stop at a light. light turns green take off still good travel onto another road cruise at 55 still good get to town 25mph speed limit good first stoplight i stop and leave still good. i stom at two more lights still good slow down to go over railroad tracks then accelerate it feels a little off but still ok drive antoher 2 miles at 25mph speed up to 40mph leaving town for 1/2 mile slow down to make a turn and bam when i straighten up the truck to accelerate it has a noticable hesitation and some sputtering the carburetor is also pretty hot to the touch i run 93 octane gas.




 
bobb 
Super Senior Member
Posts: 5611

Loc: paradise
Reg: 09-05-03
04-05-20 10:37 PM - Post#2790433    
    In response to orange82chevy

hot to the touch can be a wide range. can you hold onto it without having to let go? what kind of ignition do you have? can you cool it with a wet rag?

70 L camino, grampa engine, g-force 5 spd, road rage suspension. Pray first before all else fails.


 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25138
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-06-20 03:55 AM - Post#2790439    
    In response to bobb

Is a mechanical fan installed? Or are electric fans controlling temperature? Do you have an intake part number? How is the fuel line routed?

Idle RPMs seem a little low. I like at least 650 or more. My ZZ4 with a loopy cam will idle at 550 RPMs. The 2500 stall is okay with low RPMs. Launching a little to slow from 550 RPMs. Edelbrocks are notorious for heat problems.
Which vacuum port is being used for vac advance?
Which lever hole is being used for fuel pump secondary feed?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
orange82chevy 
Newbie
Posts: 9

Reg: 04-05-20
04-06-20 01:34 PM - Post#2790504    
    In response to gchemist

im using a heavy duty clutch fan
my fuel line is a steel line coming from the mechanicle fuel pump going into about a foot of rubber fuel line.
550rpm was a typo 650 rpm is what im idleing at
my intake manifold is a dual plane high rise intake just like the performer rpm intake
my vaccum advance hose is connected to ported vaccum port
im using the top hole for the accelerator pump for the biggest shot because it helps some with a secondary hesitation i have when i stomp the peddel doing about 60mph it hesitates.






Edited by orange82chevy on 04-06-20 01:38 PM. Reason for edit: No reason given.

 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25138
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-06-20 02:14 PM - Post#2790505    
    In response to orange82chevy

Interesting. My setup is almost the same. Mine has an RPM Air Gap. The fuel line difference is steel. Mine is steel from pump to carburetor. I custom bent it. The fuel filter is only a few inches from the carb and parallel. The filter is metal encased too.

You have the same problem as my ZZ4. Mechanical secondaries. Too much fuel for not enough RPM/vacuum. The best carb acceleration for mine is to ease into it. As RPMs start to climb and vacuum increases, then floor it. Depending on speed, it can actually kick down from 3rd or 4th down to 1st and really take off.

What type of filter housing is mounted? Mine has a dual ram air intake. The 81-82 bumper set up uses the turn signal holes as air intakes. The cooler air helps during the summer.

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
Shepherd 
Frequent Contributor
Posts: 2066

Loc: Lake George, NY
Reg: 11-11-15
04-06-20 02:19 PM - Post#2790507    
    In response to orange82chevy

Ported vacuum is not recommended, should be manifold.



 
orange82chevy 
Newbie
Posts: 9

Reg: 04-05-20
04-07-20 01:41 PM - Post#2790565    
    In response to gchemist

gchemist thanks for the help i got a realy good deal on a quickfuel 650 cfm dual feed carburetor i bolt it on set the mixture screws with a vaccum gauge adjusted the idle took it out for 3 drives problem solved.



 
gchemist 
Member #271 Senior Chevytalk Moderator
Posts: 25138
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
04-07-20 03:09 PM - Post#2790576    
    In response to orange82chevy

Nice! Did you bend a steel line from carb to pump?

'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles


 
orange82chevy 
Newbie
Posts: 9

Reg: 04-05-20
04-08-20 02:33 PM - Post#2790664    
    In response to gchemist

yes i bought a metal fuel line and bent it. its running way better than it did with the edelbrock.
im hoping when the track opens back up i can get my 12.75 time down to 12.50 with this new carb and a better set of tires.i probaly could do better than 12.50 if i practice alot more.this is my first build.my uncle has a 1970 chevelle with a 402 bbc in it it has headers dual exhaust edelbrock rpm intake and holly 750 carburetor.muncie 4 speed and 4.10 gears and i mop the floor with that car from start to finish



 
orange82chevy 
Newbie
Posts: 9

Reg: 04-05-20
04-08-20 02:35 PM - Post#2790666    
    In response to gchemist





Edited by orange82chevy on 04-08-20 02:37 PM. Reason for edit: No reason given.

 
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