1998 Toyota Corolla CE Acceleration Problems - Toyota Nation Forum : Toyota Car and Truck Forums


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8th Generation (1998-2002) Specific discussion of the 8th generation

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Old 02-13-2010, 02:26 PM   #1 (permalink)
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Red face 1998 Toyota Corolla CE Acceleration Problems

I have a 1998 Toyota Corolla CE with automatic transmission, has 160,000 miles.

I've noticed that for about the past year, it's been having problems accelerating. It's worst during colder weather, which I would expect, but I've tried basic things to try and help and it's still having issues.

What it did last night was basically.. I let it warm up a bit, like I normally do, and got a ways out of my parking lot at work and down the street. It needed to shift gears, but instead of shifting quickly like it does sometimes, it slowed way down and took quite a few seconds of being very slow before it bumped into the next gear, with a noticeable jarring to the car. This has been the worst experience, usually it doesn't slow down quite so much, but it worries me.
So far, I've had both oxygen sensors replaced, the PCM because apparently it was causing issues with the oxygen sensors, and the catalytic converter replaced, as well as using fuel injector additives to my gas to help clean the fuel injectors, because I thought that might be part of the problem. After replacing the o2 sensors, I noticed that it ran better for a short while, but then it eventually went back to what it was doing in the first place. My mechanic told me he cannot figure out what is wrong with it, so I'm wondering if I should get a second opinion with another mechanic, or whether there are other things I could try myself that might help. I've just ordered an owner's manual (unfortunately she didn't come with one) and was going to take a look at that to see if I could find any info, but I also thought I might ask a few opinions as well.


By the way, if you suggest I do something.... and it has something to do with engine parts.. let me know where that part is.... because I'm not so slick on my know how of engines and I'm basically just getting to know cars, period.


~Tania
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Old 02-13-2010, 06:30 PM   #2 (permalink)
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Have you tried cleaning the MAF sensor? It is located above your air filter assembly.
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Old 02-13-2010, 08:27 PM   #3 (permalink)
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I haven't. I didn't know that existed. I don't even know where my air filter assembly is. LOL
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Old 02-13-2010, 08:39 PM   #4 (permalink)
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http://www.spydermagazine.com/2002/M.../maf_clean.htm

Check this out
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Old 02-13-2010, 10:27 PM   #5 (permalink)
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Hmm, okay. I might even be able to understand how to do that! Wow! lol
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Old 02-14-2010, 11:43 AM   #6 (permalink)
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Quote:
Originally Posted by DjiNN View Post
Have you tried cleaning the MAF sensor? It is located above your air filter assembly.
The 98-99 Corollas dosen't have a MAF (mass air flow sensor), they have a MAP (manifold absolute pressure sensor) located on top of the throttle body, i think that you can't clean it.

The MAF replaced the MAP on newer.

I think that the new 1ZZ-FE with VVT-I in the 2000+ has a MAF.
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Old 02-14-2010, 02:26 PM   #7 (permalink)
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Well no wonder I couldn't find it! hahaha
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Old 02-14-2010, 09:17 PM   #8 (permalink)
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http://liberty.eurekaboy.com/mapsensor.htm

Here is a writeup but not for a Corolla. It talks about how to clean the MAP sensor.
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Old 02-16-2010, 07:20 AM   #9 (permalink)
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Hi,
try to change spark plugs , use only recomend one NGK or DENSO it really important in toyota to use right one I found out about it hard way .Also buy SEAFOAM and pour half bottle to the full tank of gas.Do you have engine check light?
Also clean the throttle body , buy cleaner in auto zone , type "clean throttle body pictures" in the search engine

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Old 02-16-2010, 08:25 AM   #10 (permalink)
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Is your CEl light on? See if you have any codes stored and let us know. What about the plugs/wires? Does it miss at all speeds, rpms, etc?
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