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#1
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400 dies out when coming to idle
74 400 bored .030 over, 62 cast heads with the horrible eight relief pistons. Just rebuilt the 700 Holley double pumper at the begining of spring. Plugs are tan. has been running really well till last night. No bogs or hesitation, idled at 800 rpm's in gear. On the way home last night I had to two foot it to keep it running when not on the gas. Seems like it's loading up on me. at a red light the idle would drop from 800 to 600 and then start to stall unless I feathered the pedal to keep it running. Fuel pressure stayed a constant 6.75 lbs. Needle never moved till I shut it off. Sitting in park in my driveway it did the same thing. 6.75 lbs fuel pressure, idle 800 to 600 to stall. All within twenty seconds. pulled both float bowl sight screws, and fuel was just trickling out, both bowls full. Checked all vacumn fittings and lines/plugs. Still intact. Did not check spark , but does not instantly cut out like spark. Will fire up after stalling. Got gas about a half hour before this happened. Bad fuel????
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74 GTO 406 T400 74 Firebird 350 4-speed 68 GTO Convertible 400 T400 76 GP LJ 400 4BBL T400 78 Chevy 1/2 Ton Truck Oh yea I love my wife very much For some reason it got erased when I put it here last time!!!!!! hmmmmmmmm |
#2
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Unleaded fuel? Why are the plugs tan?
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#3
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I think I'd be looking for some trash in the float bowl. Maybe a small piece got in the needle and seat area?
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#4
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If at idle and looking down into the primary's and you see no fuel dribblingout of the boosters then I would say that your fuel level is good and if you hook up a timing light and see it able to flash at idle then your spark is likley good also .
Next check your timing at idle. After that I would pull all the plugs and check for even compression within 8% in all cylinders. To check for bad fuel if you have rubber line feeding the Carb then run the motor a squeeze it off until the motor runs out of fuel, next get some known good fuel and pour it carefully ( I use a spray pain can cap) into each of the Carbs vent tubes until it shows in the sight plugs and then see how the motor runs for you.
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#5
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Sounds a whole lot like a leaky power valve to me.
Border line, if not exact, text book on the symptoms. Clay
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All the federales say,they could've had him any day They only let him slip away, out of kindness...I suppose Poncho & Lefty |
#6
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Quote:
Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#7
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I did notice I could grab the throttle linkage and pull it forward a touch, and the rpm's would come down. It was not hitting the idle screw. I did readjust the throttle. It helped a lot, but a few times at a light I did get a lower idle where it wanted to stall till I feathered the pedal. It's inconsistant right now. I need to drive it some more to see how it acts.
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74 GTO 406 T400 74 Firebird 350 4-speed 68 GTO Convertible 400 T400 76 GP LJ 400 4BBL T400 78 Chevy 1/2 Ton Truck Oh yea I love my wife very much For some reason it got erased when I put it here last time!!!!!! hmmmmmmmm |
#8
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Quote:
You could start by unhooking the cable and springs, rotate the accelerator and see if the travel is easy and unimpeded. |
#9
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I've had fuel boiling issues when running the car for a while
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#10
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You answered your own question. If the throttle is not closing without help by pushing it closed, that's the problem. It's likely that the throttle sometimes does close completely and the engine dies.
I've found this problem sometimes happens only when the engine is hot. The throttle shaft or throttle arm on the carb may bind only when hot. A stiffer return spring rarely fixes the problem. Check the throttle cable carefully--ease of movement and adjustment--the most likely candidate for sticking. Let us know what you find.
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BONESTOCK GOATS '64 GTO Tripower Hardtop (Wife's Car) '64 GTO Tripower Post Coupe (My Car) '99 Bonneville SE Sedan |
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