1991 Corolla 4AFE Cold Start Problems - Toyota Nation Forum : Toyota Car and Truck Forums


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Older Generations (1969-1987) Specific discussion of the AE86, along with generations 1 through 5.

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Old 02-12-2005, 10:38 PM   #1 (permalink)
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1991 Corolla 4AFE Cold Start Problems

Hey Folks
My 1991 Corolla is hard starting in temps below 45 degrees. I've been doing some research on my All-Data computer, but I haven't started any of the diagnostics. EX: Trip the trouble codes.
I don't get a check engine Light so I don't think that will do me any good.
Car runs good and strong otherwise. Knock on wood!
Anyone looking for this vintage Corolla Sedan 4AFE Parts shoot me an Email. I have a cashe of hoarded parts, and can get much much more if needed.
Thanks
Pat
BTW My Car is Injected!
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Old 02-12-2005, 10:50 PM   #2 (permalink)
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What exactly does it do? Does it just turn over slow? Or what?
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Old 02-12-2005, 11:56 PM   #3 (permalink)
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Quote:
Originally Posted by Dr Tweak
What exactly does it do? Does it just turn over slow? Or what?
It turns over fine. Its just that its not starting right up. Takes like 2 ten second cranks to get it going. Its normally turn key in warm weather
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Old 02-12-2005, 11:59 PM   #4 (permalink)
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Well, run the codes.

Things to check are your spark, timing, and fuel pressure...
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Old 02-13-2005, 12:35 AM   #5 (permalink)
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I'm taking a guess that its the AITS (Air inlet temp Sensor)
If it were timing it would be popping all the time and have no balls. Which it isn't and whips my 340 pound fat @$$ around pretty good.
I should test the Fuel Pressure. I have the tools to do it. Should do a Fuel filter too I think its OE. I never changed it anyway..
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Old 02-13-2005, 12:47 AM   #6 (permalink)
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I think a better guess would be the cold start injector.

-Tim
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Old 02-13-2005, 03:55 AM   #7 (permalink)
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my 4afe has the same problems, only its a carbie fed. i duno for sure but me n my neighbour came up wif the conclusion it was the wax bearing in the carbie. something to do with the contracting and expanding of it. not stoping n starting air flow like a proper choke... :S not certain...
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Old 02-13-2005, 04:04 AM   #8 (permalink)
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I agree with Tek...probably a cold-start injector. Check the cold-start injector as well as the cold-start injector time switch. When it does start, does it run at fast idle (@1500rpm) or does it run at normal idle (@700 rpm)? If it does not run at fast idle when you start if cold it could be a temp sensor or a cold-start injector. Good luck. Regards, Aaron
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Old 02-13-2005, 06:52 AM   #9 (permalink)
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Doesnt sound like anything is the problem, hey it is COLD WEATHER, fuel doesnt atomize that great in cold temperatures, hence it would start up slower.
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Old 02-13-2005, 07:19 PM   #10 (permalink)
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Quote:
Originally Posted by Flashmn
Doesnt sound like anything is the problem, hey it is COLD WEATHER, fuel doesnt atomize that great in cold temperatures, hence it would start up slower.

My car fires right up no matter how cold it is. He claims to be having this problem when it is below 45 degrees. That car should start right up when it is 40 degrees outside! Definitely a problem. Regards, Aaron
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Old 02-13-2005, 07:49 PM   #11 (permalink)
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Which is why the cold start injector is way up the intake manifold; give the gas some "time" to atomize before it hits the intake valves.

And yes, it's great hopping in my car in 19F temps and seein it kick right over like I had just turned it off. Though, it's hard keepin the GZE outta boost on a cold motor.


-Tim
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Old 10-08-2007, 09:17 PM   #12 (permalink)
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I'm having the exact same problem with my 91 Corolla. I agree it's either the cold start injector and/or the cold start time switch. Anyone know where to find the time switch?!

Also, what method do you guys use to check auto trans fluid level. Every manual i've checked mentions different levels at different temps, and driving time.... I'm used to the "check it in neutral when it's hot" method...

Thanks very much!
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