Hesitation Problem 79
03-12-12, 11:03 PM
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Hesitation Problem 79
I am the original owner of a 79 (52k miles) which is exhibiting a "Hesitation Problem".
Starts fine and Idles at 800 solid - choke goes off when heated up - when I am sitting still in neutral, clutch in, all is totally smooth as I accelerate the engine through the entire range of RPM. Get on the road and there is marked hesitation under normal pedal pressure starting at about 2,800 thru about 4,000 rpms - in each gear (I think the problem starts at slightly higher revs as you go up through the gears). As I am driving along, if get to an upgrade (and we have lots of hills here in the Shendoah Valley) it starts slowing down and then balking/hesitating- HOWEVER, if I punch the pedal while hesitation is present, power kicks in pretty quickly and off we go with full power... In the "trouble" range of RPM, the car chugs and seems to be struggling to get fuel. It feels like it has no power, until I punch it and then it feels good. It is almost like a miss in a piston engine, although I don't suspect an electrical problem. The problem isn't subtle; like hitting a brick wall in power unless you floor it for a for seconds or down shift to get higher RPMS.
My Car: 1st GEN - Stock 79 GS - 5 speed manual - (Has new aluminum radiator)Carb taken apart and "reconditioned" (I dont know much about these complicated carbs; the mechanic I am working with took the carb apart and cleaned it and says that the seals were good.) - fuel accelerator diaphragm replaced - new fuel filters - new fuel pump - vac lines to carb inspected and replaced where needed - generally looked at all vac lines - air filter good - seems like accelerator cable is working smoothly - mechanic says he looked in the gas tank somehow(?)car does not smoke at all
More info: The car had maybe ten year old gas in it, until about two years ago when I siphoned it out. I then put a full tank of fresh gas with sta-bil in it and changed the fuel filters. Gas tank was siphoned out again when the present problem manifested itself, Sea Foam was added to new gas and the fuel filters have been changed.
Thanks for any ideas you may have.
Starts fine and Idles at 800 solid - choke goes off when heated up - when I am sitting still in neutral, clutch in, all is totally smooth as I accelerate the engine through the entire range of RPM. Get on the road and there is marked hesitation under normal pedal pressure starting at about 2,800 thru about 4,000 rpms - in each gear (I think the problem starts at slightly higher revs as you go up through the gears). As I am driving along, if get to an upgrade (and we have lots of hills here in the Shendoah Valley) it starts slowing down and then balking/hesitating- HOWEVER, if I punch the pedal while hesitation is present, power kicks in pretty quickly and off we go with full power... In the "trouble" range of RPM, the car chugs and seems to be struggling to get fuel. It feels like it has no power, until I punch it and then it feels good. It is almost like a miss in a piston engine, although I don't suspect an electrical problem. The problem isn't subtle; like hitting a brick wall in power unless you floor it for a for seconds or down shift to get higher RPMS.
My Car: 1st GEN - Stock 79 GS - 5 speed manual - (Has new aluminum radiator)Carb taken apart and "reconditioned" (I dont know much about these complicated carbs; the mechanic I am working with took the carb apart and cleaned it and says that the seals were good.) - fuel accelerator diaphragm replaced - new fuel filters - new fuel pump - vac lines to carb inspected and replaced where needed - generally looked at all vac lines - air filter good - seems like accelerator cable is working smoothly - mechanic says he looked in the gas tank somehow(?)car does not smoke at all
More info: The car had maybe ten year old gas in it, until about two years ago when I siphoned it out. I then put a full tank of fresh gas with sta-bil in it and changed the fuel filters. Gas tank was siphoned out again when the present problem manifested itself, Sea Foam was added to new gas and the fuel filters have been changed.
Thanks for any ideas you may have.
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