surging when accelerating

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laceman

surging when accelerating

Post by laceman »

when driving the car when I reach the top speed of a gear the car starts to jerk like a first time driver in a standard. When I let off the gas the car seems to lose any power but it will come back and start to drive normal and the surginging starts again, any ideas?
htchevyii
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Joined: Thu Jan 17, 2008 9:31 pm
Your car is a: 1982 Spider hers 1972 Spider his
Location: Hydesville, CA (NorCal)

Re: surging when accelerating

Post by htchevyii »

What year car? Could be motor mounts if you have an early car.
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1982 SPIDER 2000, 1964 CHEVYII, 1969 Chevy Nova, 2005 DODGE RAM, 1988 Jeep Comanche
1972 Spider, 78 Spider rat racer 57 f-100,
narfire
Posts: 3959
Joined: Sat Dec 27, 2008 2:14 am
Your car is a: 1980 124 spider
Location: Naramata B.C.

Re: surging when accelerating

Post by narfire »

Not sure fuel injected or carb?
Just an amature guess... small hole somewhere and the increased airflow sucking air where its not suposed to... leaning the engine out?
80 FI spider
72 work in progress
2017 Golf R ( APR Stg. 1)
2018 F350 crew long box
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maytag
Posts: 1789
Joined: Mon Oct 19, 2009 9:22 pm
Your car is a: 1976 124 spider
Location: Rocky Mountains....UTAH! (Not Colorado)

Re: surging when accelerating

Post by maytag »

sounds to me like you're starving for fuel on the top-end.
Check the fuel filter and the float level in the carb (assuming it's carb'd?)

It's also possible you've got a fuel pump going.... but I'd leave that for last, unless you've got a gauge and can easily test it.

let us know what you find?
I'm no Boy-Racer..... but if I can't take every on-ramp at TWICE the posted limit.... I'm a total failure!
So Cal Mark

Re: surging when accelerating

Post by So Cal Mark »

if you have a carbed engine with a mechanical fuel pump, you probably need a new pump. As stated previously though, the entire integrity of the fuel delivery system needs to be checked
laceman

Re: surging when accelerating

Post by laceman »

It is a 1976 with a carb I added a new electric fuel pump already. I will check the fuel filter and system any other ideas are greatly appreciated. Thanks.
So Cal Mark

Re: surging when accelerating

Post by So Cal Mark »

is the new pump back near the tank? How is the filter? Float level in the carb could be too low, there is a small screen in the inlet of the carb
laceman

Re: surging when accelerating

Post by laceman »

The pump is back by the tank and the filter is one of those cheap plastic ones up by the carb
MNspiderman

Re: surging when accelerating

Post by MNspiderman »

I agree that its probably a fuel problem, but there is that possibility that if you have points, they may be weak or floating above a certain rpm which is making your car feel like its surging being its happening at higher rpms. just another opinion
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