Poor Acceleration/Bad MPG/Many New Parts - Toyota Celica Forum
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post #1 of 2 (permalink) Old 02-17-2020, 09:36 PM Thread Starter
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Unhappy Poor Acceleration/Bad MPG/Many New Parts

Hi All!


Really struggling with my 20R and was hoping someone might be able to help.
I have a 1980 Celica GT with 168k miles, I'm the third owner and have all the repair receipts (if those might be helpful).


The Prob:

- Starts up on the first turn occasionally, other times needs pedal assistance, idles great with a sputter very rarely

- The gas mileage was not great when I first bought the car, about 13 mpg.
- When I start the car it takes approx 3 min to warm up enough to drive (prepared to deal with this)
- Before a 5 min warm-up the acceleration on a scale of 1-10 is a 1
- After driving for about 5 minutes (after warm-up) the acceleration is still very boggy and there's a good amount of shudder (whole car shakes) when leaving a complete stop. Acceleration at this point a 3

- When I get into 2nd or 3rd gear, the acceleration is much more responsive but there is still an odd "budder" noise in the drive train somewhere. Acceleration at this point is a 5

- At times I was getting less than 10mpg until I leaned out the carb (it's back to 13mpg roughly). Adjustment screw is now approx. 1 1/2 turns out from closed
- On attempting to get the smog passed the gas mix was read at 4% and after replacing the carb it was down to approx. 1.3%

- When I park the car there is a mild hot smell that doesn't seem to come from under the hood



-- Trans fluid is bright red, v clean
-- Just had oil change


Very recently replaced parts:
Carburetor (aftermarket I think)

Catalytic Converter

Air Filter
Spark Plugs
Spark Plug Wires
Oil Change


Any help would be greatly appreciated, I'm a bit handy with cars and can't really afford a mechanic right now. Love the car and want it to not be sick anymore
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post #2 of 2 (permalink) Old 02-18-2020, 04:08 PM
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Ah, memories. . .

Throwing parts at it, hoping something will stick. . .

Sounds like timing or missing cylinder.

Check timing, check spark at each plug

Check compression of each cylinder

Also, try disconnecting exhaust at the manifold. Plugged exhaust can create same symptoms.
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