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#4624934 - 01/05/18 01:05 PM Slow acceleration - carb versus engine?
ArtDecoWorld Offline


Registered: 01/02/17
Posts: 23
Loc: CA
I went to look at a 1980 Tercel the other day. Having had them before, this one felt slower to accelerate/less power.

One can't start pulling things apart when looking at a vehicle. So, is there a way to help differentiate whether something like this is more likely to be a carb/fuel issue, or a worn engine?

Thanks


Edited by ArtDecoWorld (01/05/18 01:06 PM)

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#4624943 - 01/05/18 01:15 PM Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld]
PimTac Online   content


Registered: 03/04/17
Posts: 4255
Loc: Soviet State of Washington
A compression test will give you an idea of what shape the engine is in. How many miles on this car?

Could be fuel, valves, so many things. Itís a 38 year old vehicle.
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#4624945 - 01/05/18 01:16 PM Re: Slow acceleration - carb versus engine? [Re: PimTac]
ArtDecoWorld Offline


Registered: 01/02/17
Posts: 23
Loc: CA
Originally Posted By: PimTac
A compression test will give you an idea of what shape the engine is in. How many miles on this car?

Could be fuel, valves, so many things. Itís a 38 year old vehicle.


True. But no way I can do that at this guy's house. Miles are 162k.

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#4624955 - 01/05/18 01:25 PM Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld]
Kestas Offline



Registered: 06/04/02
Posts: 12325
Loc: The Motor City
1980s cars in general were slow to accelerate. I've owned a few. I swear the econoboxes did not need an accelerator, just an on/off switch.

The bane of most cars from the 80s was the vacuuum lines. They would get old and brittle, allowing for vacuum leaks. The car would run somewhat sick.

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#4624959 - 01/05/18 01:33 PM Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld]
Chris142 Online   content


Registered: 06/05/03
Posts: 16817
Loc: Deplorable in apple valley, ca
As mentioned could be lots of things. My 1st thought is timing or a stretched throttle cable.
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#4624976 - 01/05/18 01:47 PM Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld]
mightymousetech Offline


Registered: 04/03/17
Posts: 1444
Loc: Ontario, Canada
Originally Posted By: ArtDecoWorld
Originally Posted By: PimTac
A compression test will give you an idea of what shape the engine is in. How many miles on this car?

Could be fuel, valves, so many things. Itís a 38 year old vehicle.


True. But no way I can do that at this guy's house. Miles are 162k.


Compression test takes 10 min. Should be easy to do at the guys house.
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#4625105 - 01/05/18 03:39 PM Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld]
Trav Offline


Registered: 11/20/06
Posts: 18856
Loc: MA, Mittelfranken.de
At this age anything can be wrong, along with the other things mentioned in the thread look at the vacuum advance on the distributor. At 37 years old (if original) its very likely the rubber diaphragm has failed.
IIRC this one has a few hoses going to it.
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#4625150 - 01/05/18 04:31 PM Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld]
Rolla07 Offline


Registered: 11/05/11
Posts: 4734
Loc: MTL, CANADA
Id check for rust underneath. Is it burning oil when running? Any leaks? Any reason you are considering a 1980 Tercel?!


Edited by Rolla07 (01/05/18 04:31 PM)
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#4625159 - 01/05/18 04:37 PM Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
80's "smog motors" suffered from:
1) low compression ratios,
2) small head ports,
3) very lazy cam timing,
4) lazy ignition timing, and
5) lean mixtures.

Welcome the 90's when cars actually started to have some performance along with economy.
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