car is bucking under acceleration...any ideas? |
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car is bucking under acceleration...any ideas? |
era vulgaris |
Aug 27 2014, 02:04 PM
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#1
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J is for Genius Group: Members Posts: 982 Joined: 10-November 13 From: Raleigh, NC Member No.: 16,629 Region Association: South East States |
My car has developed an extremely annoying bucking under acceleration. It started about a week ago, and at first it would only happen while accelerating out of a fast turn. But now it does it all the time while accelerating. It's like the car is oscillating between half power and full power, making it lurch-slow-lurch-slow-lurch-slow. It's like you're riding a bucking bronco or something. The only cure seems to be to get off the throttle completely, upshift, then slowly accelerate.
Anyone have any idea where I should start looking first? |
r_towle |
Sep 2 2014, 09:47 PM
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#2
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Custom Member Group: Members Posts: 24,574 Joined: 9-January 03 From: Taxachusetts Member No.: 124 Region Association: North East States |
I would suggest a few things.
A new fuel tank sock on the return line at the fuel tank... Check all your fuel lines. Check all your wiring, make sure all the fuel injection wiring is properly connected and not loose...it happens. Do new points, new plugs, and new wires, rotor and distributor cap. Remove the advance plates and clean then inside the distributor...40 year old grease is like glue now... Remove the if trigger points and blow out all the crap from the bottom of the distributor. Full tune up Set valves Set dwell Set timing Check fuel pressure. Now you would have eliminated a large number of variables...it's just a good place to start. |
era vulgaris |
Sep 3 2014, 09:05 AM
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#3
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J is for Genius Group: Members Posts: 982 Joined: 10-November 13 From: Raleigh, NC Member No.: 16,629 Region Association: South East States |
I would suggest a few things. A new fuel tank sock on the return line at the fuel tank... Check all your fuel lines. Check all your wiring, make sure all the fuel injection wiring is properly connected and not loose...it happens. Do new points, new plugs, and new wires, rotor and distributor cap. Remove the advance plates and clean then inside the distributor...40 year old grease is like glue now... Remove the if trigger points and blow out all the crap from the bottom of the distributor. Full tune up Set valves Set dwell Set timing Check fuel pressure. Now you would have eliminated a large number of variables...it's just a good place to start. Plugs, wires, cap, rotor are all only a few months old. I've put in a new pertronix elec ignition and flame thrower coil also. FI wiring has been gone through and all contact points cleaned. Valve adjustment, timing, and dwell has been done in the last couple months. All FI hoses are only a few months old, and routed correctly. Injectors are all recently rebuilt - all bought here from a couple different forum members. All 4 elbow hoses are new. The rest of the fuel hoses are relatively new (I didn't install them, but they're definitely not OE.) I plan on having the fuel tank cleaned and a new sock installed by a local air-cooled shop here in town. Is there a good guide somewhere to pulling and cleaning the dizzy? This is really the only other thing I haven't done. |
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