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Slow acceleration - carb versus engine? #4624934
01/05/18 01:05 PM
01/05/18 01:05 PM
Joined: Jan 2017
Posts: 23
CA
ArtDecoWorld Offline OP
ArtDecoWorld  Offline OP
Joined: Jan 2017
Posts: 23
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

Last edited by ArtDecoWorld; 01/05/18 01:06 PM.
Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld] #4624943
01/05/18 01:15 PM
01/05/18 01:15 PM
Joined: Mar 2017
Posts: 6,497
...
PimTac Offline
PimTac  Offline
Joined: Mar 2017
Posts: 6,497
...
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.


Cannot see signatures any longer so it doesn’t matter.
Re: Slow acceleration - carb versus engine? [Re: PimTac] #4624945
01/05/18 01:16 PM
01/05/18 01:16 PM
Joined: Jan 2017
Posts: 23
CA
ArtDecoWorld Offline OP
ArtDecoWorld  Offline OP
Joined: Jan 2017
Posts: 23
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.

Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld] #4624955
01/05/18 01:25 PM
01/05/18 01:25 PM
Joined: Jun 2002
Posts: 12,642
The Motor City
Kestas Offline
Kestas  Offline
Joined: Jun 2002
Posts: 12,642
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.

Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld] #4624959
01/05/18 01:33 PM
01/05/18 01:33 PM
Joined: Jun 2003
Posts: 17,814
Deplorable in apple valley, ca
Chris142 Online content
Chris142  Online Content
Joined: Jun 2003
Posts: 17,814
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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Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld] #4624976
01/05/18 01:47 PM
01/05/18 01:47 PM
Joined: Apr 2017
Posts: 1,481
Ontario, Canada
mightymousetech Offline
mightymousetech  Offline
Joined: Apr 2017
Posts: 1,481
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.


Mighty Mouse Tech
BMW Tech, Former Acura Tech
2010 Civic Si Castrol 0W40, Redline MTL
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Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld] #4625105
01/05/18 03:39 PM
01/05/18 03:39 PM
Joined: Nov 2006
Posts: 20,569
MA, Mittelfranken.de
Trav Offline
Trav  Offline
Joined: Nov 2006
Posts: 20,569
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.


ASE L1, Master. Deutsch Meisterbrief.
Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld] #4625150
01/05/18 04:31 PM
01/05/18 04:31 PM
Joined: Nov 2011
Posts: 4,967
MTL, CANADA
Rolla07 Offline
Rolla07  Offline
Joined: Nov 2011
Posts: 4,967
MTL, CANADA
Id check for rust underneath. Is it burning oil when running? Any leaks? Any reason you are considering a 1980 Tercel?!

Last edited by Rolla07; 01/05/18 04:31 PM.

2007 Corolla Red Pearl 155k miles
PP 0w20 & ST 4967

Re: Slow acceleration - carb versus engine? [Re: ArtDecoWorld] #4625159
01/05/18 04:37 PM
01/05/18 04:37 PM
Joined: Dec 2016
Posts: 7,138
Waco, TX
Linctex Online content
Linctex  Online Content
Joined: Dec 2016
Posts: 7,138
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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