I'm having problems with my 2nd car. It's an 84 Sport Coupe with a 2.8, Auto. A few months ago it started acting up. When going up hills trying to accelerate, the car bucks and almost cuts out at times. I replaced plugs, wires, coil, fuel filter, cap, rotor. Everything else looks ok on it. It's not a problem that happens all the time, it's very intermittant. Sometimes it will run fine, but most of the time it does this. I'm really only down to a few different options, I'm thinking it's either the carb needs rebuilt, a new fuel pump, or something is messed up in the distributor.

Anyone got any ideas? Thanks

 

It does sound like a carb problem... either that, or timing. I'd bet that your TCC is kicking in, and bogging the car.

TCC = torque convertor clutch; it's part of the 700r4 trans you have (which started for V6's in 1984). Try this- next time your car starts sputtering up a hill, keep your right foot constant on the gas pedal, and tap your brake with your left foot. Press the brake just enough to make the brake lights come on, but not enough to slow the car. The TCC disengages when the brake pedal is pushed.

So if your car stops sputtering as you try this, it's not saying the TCC is bad. The Haynes 82-92 Camaro (or Firebird, whichever you have) manual has a good section on rebuilding the E2SE 2bbl carb.


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-Tom P (Hot rodded 1986 Firebird 2.8l)

 

i'm getting the same thing, my carb just needs a rebuild, you probably need the same.

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Be lazy, try replacing the fuel filter AND the RUBBER fuel lines!!!
See if that helps!!

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA

 

To be honest about it... the car doesn't have a rubber line from the fuel pump to the carb. The previous owner replaced it with copper line. The fuel filter is new... replaced it as soon as it started to do this.

Tried the whole TCC thing, and it doesn't affect it. It runs rough if my foot is on the brake or not... so that's not the problem... or at least not the one that is the major one right now. =)

 

Did your RPM's go up with the TCC test? (They should have.) Like I said, this won't point to a bad TCC... hell, it won't really help your problem at all, it's more of an interesting fun thing to do, so why the hell did I mention it in the first place? (laughs) Oh well!!


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-Tom P (Hot rodded 1986 Firebird 2.8l)

 

If you could, try to do a compression test. If a head gasket is leaking or a valve is sticky it can cause a similar misfire (speaking from experience).

You can check the fuel pump with a guage. You should have over 3 PSI when the engine is running. I had a pump that would deliver gas into a cup but would crap out when trying to push it into a carb.

I don't like the idea of a copper fuel line. Copper is soft and work hardens and can split or break very easily causing a fire. Please consider getting either a steel line off another engine or a steel braided rubber line. There's also a chance it is causing your problem. Copper conducts heat about 5 times as well as steel and a lot better than rubber. It may very well be putting enough heat into the gas to boil the light fractions even before it gets in the carb.

Good luck & cheers,

Duane

 

Your problem is fuel pressure under engine demand.
I had this problem with another car. It was using the wrong fuel line.
IT COLLASPED AS I PUT A POWER DEMAND ON The ENGINE!!
So, it bucked.
Swap fuel lines for your solution.
OR use FUEL INJECTION HOSE for the routing from the pump to the carb!! (the hose is kinda expensive, be prepared, but less than steel braided!-but easier to work with)
USE FUEL INJECTION HOSE!
IT's thicker & more resistant to this suction collasping fuel line problem. Easier fix than replacing the copper to the steel hose.
COPPER IS FOR HOME PLUMBING!!!!! Not your car!

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Chat Soon,
KED85
Karl
1985 Firebird 2.8 to 3.4 swap project for Smog Happy LA, CA