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1967 Pontiac GTO runs out of steam at high acceleration

Tiny
JLHAGEN
  • MEMBER
  • 1967 PONTIAC GTO
  • V8
  • 2WD
  • AUTOMATIC
  • 11,200 MILES
I put a 428 in and new fuel pump for a 4bb, new 1411 eidelbrock with eid intake. When I get on it on the freeway about 70 it starts to feel like push me pull me. No back fire just acts like no fuel. 3/8" gas line no entermediate fuel filter. Did this with old carb, intake and fuel pump. Could the timing chain be installed wrong. Also installed elect. Dist. Still the exact same.
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Thursday, February 12th, 2009 AT 8:58 PM

3 Replies

Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
How does it idle? How does it run if you go full throttle from a stop? Will it rev out and shift or does it seem to starve for fuel? Have you tried varying the ignition timing forward and back and see if it gets better? A modified engine or camshaft will not run perfectly on factory timing specs so you might need to time it by ear.
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Friday, February 13th, 2009 AT 6:34 AM
Tiny
JLHAGEN
  • MEMBER
  • 2 POSTS
It idles great will rev out and shift to second and when it finally gets to third it will all of a sudden start to act like it is starving for fuel and start lunging back and forth. When I let it settle down to a normal gas peddle it will be fine, then if I get on it it will cut out real quick like it is running out of fuel again.
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Friday, February 13th, 2009 AT 5:17 PM
Tiny
MASTERTECHTIM
  • MECHANIC
  • 4,749 POSTS
I think its a fuel delivery problem. I think the carb is running out of fuel. The carb has a bowl that gets filled with fuel and is used in reserve for wide open throttle and wide open for a long time the bowl will run dry and the fuel pump needs to pump fuel into it to keep the supply going, if you dont have enough fuel volume then it will do exactly what your explaining. I would first unhook the fuel line to the carb and put it into a bottle and watch the fuel come out when cranking. There should be a even steady flow of fuel. Next I would install a fuel pressure gauge and watch pressure on wide open throttle and get back to me
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Saturday, February 14th, 2009 AT 6:43 AM

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