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5th & 6th Generation (2002-2006 & 2007-2011) Toyota Camry Discussion for years: 2002-2006 & 2007-2011 Topics of discussion range from fuel economy, safety, modifications, performance all involving America's favorite family car, the Toyota Camry.

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Old 12-30-2009, 10:20 PM   #1 (permalink)
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noticeable decrease in acceleration

Hey fellas, ive noticed this problem for a couple weeks and from stop-go start i noticed my acceleration isnt how it use to be. Its not enough for people to overtake me with the pedal to the floor, but its enough for me to notice. When i put the pedal to the floor, it just slowly climbs as if i wanted to drive like my mother and save petrol. I realize, the camrys arnt the best at acceleration but i do know when i notice something isnt quite right.

Ive got 81,000km on the clock, which i think is about 50,000 miles in the US and 4,000km to go until my 85,000km service. My ride is a 2.4L i4 2007 camry

Ive talked to my cousin, who knows a thing or two about cars (but is no mechanic) and he states it might be an electrical problem in the ECU though we are only taking a guess. I also noticed some heat coming from the bottom of the gear selector (near "L") for around the same time period, i dont know if this is related or not but DJKOR has advised me it could be the heat coming from the bulb below the gear selector when i have my lights turned on but i thought id just note that observation for you guys to help diagnose the problem.

All the fluid levels are fine, but its highly unlikely to be a fluid problem.

So i was wondering, what do you guys think the problem may be so i can discuss what you guys think the problem may be with toyota in the new year

happy new year to all
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Last edited by private_number; 12-30-2009 at 10:23 PM.
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Old 12-30-2009, 10:34 PM   #2 (permalink)
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Maybe your MAF sensor is not reading enough air? That can lead to fuel cutoffs at full acceleration.

Does your car's acceleration boggle? or is it just just a smooth loss of power?
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Old 12-30-2009, 11:18 PM   #3 (permalink)
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I was thinking it could be something to do with that aswell, Its just a smooth lack of power, no boggling or stuttering of the engine or anything like that. What it feels like is if you were taking off at the lights but you were in no rush, didnt put the pedal to the floor and you wanted to drive like your mother to save on fuel...but the only thing is...the pedal is too the floor!! haha

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Old 12-30-2009, 11:48 PM   #4 (permalink)
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Get a carbon cleaning and clean ur throttle body
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Old 12-31-2009, 12:09 AM   #5 (permalink)
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maf is more for stuttering acceleration. if it doesn't stutter, try just resetting ur ECU as djkor said.
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Old 12-31-2009, 12:14 AM   #6 (permalink)
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any CEL ?
Try resetting the ecu by disconnecting the negative lead off the battery for like 5 mins or so...

Sounds pretty strange for sure, especially with only 81k. Hopefully you find a solution soon!

When was the last time you did a tune up? Anything clogging the air filter/intake?
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Old 12-31-2009, 12:40 AM   #7 (permalink)
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thanks for all your replies guys, ill reset the ECU in a couple days after the new years is over and done with, only about 6 hours till 2010!
if the problem still persists, i will definietly go into toyota

CamrySExxx; last tune up was at 75,000km and no there wasnt any clogging, And there is no warning lights or anything

DJKOR; i will try clean the MAF, i have never done it before but ill give it a shot. Yes when overtaking the car responds as per normal. its just when there is a stop go start where i notice the lack of acceleration power.
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Old 12-31-2009, 12:42 AM   #8 (permalink)
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Quote:
Originally Posted by private_number View Post
Hey fellas, ive noticed this problem for a couple weeks and from stop-go start i noticed my acceleration isnt how it use to be. Its not enough for people to overtake me with the pedal to the floor, but its enough for me to notice. When i put the pedal to the floor, it just slowly climbs as if i wanted to drive like my mother and save petrol. I realize, the camrys arnt the best at acceleration but i do know when i notice something isnt quite right.

Ive got 81,000km on the clock, which i think is about 50,000 miles in the US and 4,000km to go until my 85,000km service. My ride is a 2.4L i4 2007 camry

Ive talked to my cousin, who knows a thing or two about cars (but is no mechanic) and he states it might be an electrical problem in the ECU though we are only taking a guess. I also noticed some heat coming from the bottom of the gear selector (near "L") for around the same time period, i dont know if this is related or not but DJKOR has advised me it could be the heat coming from the bulb below the gear selector when i have my lights turned on but i thought id just note that observation for you guys to help diagnose the problem.

All the fluid levels are fine, but its highly unlikely to be a fluid problem.

So i was wondering, what do you guys think the problem may be so i can discuss what you guys think the problem may be with toyota in the new year

happy new year to all
private
START by sticking an OBD 2 on it and read the code, and do not reset anything until you have the codes. So no on resetting the ECU before taking a reading. I know you never mentioned check engine light but the reader might see history if you can get one for free. Then well all up above is valid.

I am new to Toyota and still learning alot But this is a standard for newer cars, and the dealers hate doing it. If all else fails have them take it on a test drive with the reader hooked up and have them do a loop duplicating when you feel the problem. The reader should give them an exact idea of the problem, it will show soft most soft faults.

Last edited by judge34411; 12-31-2009 at 01:24 AM.
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Old 12-31-2009, 12:57 AM   #9 (permalink)
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How do i manage to "stick an OBD2" on it and read the code? I have never done this before, so sorry for my noobness fellas.
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Old 12-31-2009, 07:04 AM   #10 (permalink)
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it should be on your driver side, under the dash.
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Old 12-31-2009, 09:55 AM   #11 (permalink)
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Quote:
Originally Posted by BlackCamSe View Post
Get a carbon cleaning and clean ur throttle body
I don't know guys, I did this after I had an idling issue (cleaned the TB) and it definitely helped with acceleration, I was shocked. I also cleaned the inside of the intake tubing, which probably also helped.

I'm not sure if it was stated yet, might sound stupid, but did you try changing the air filter (assuming you haven't in a while)?

Also, make sure no connections are loose, especially on the MAF or anywhere along the intake tubing and box. Reseat them to be safe. And be EXTREMELY careful when you say you're going to clean the MAF, avoid touching the sensor in any way.
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Old 12-31-2009, 07:22 PM   #12 (permalink)
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lmao. happy new years fellas and thanks for the replies

for the record, i resetted the ECU yesterday and drove around a bit and i noticed a good improvement when acceleration. as for the airfilter, it has not been changed yet but im getting a K&N filter soon. As for any error codes, i have not checked but seems like everything is back to normal

can i read the OBD codes myself? or do i need to go to toyota for that. if i can do it myself, what do i do? im still a bit confused in reading any error codes and its location (i know, drivers side underneath the dash. is it where the odometer is?)

but as good maintainance, i will get around to cleaning the throttle body sometime when i get my lowering springs.

once again, happy new year to all and thanks for all your help on this one!
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Last edited by private_number; 12-31-2009 at 07:28 PM.
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Old 12-31-2009, 07:26 PM   #13 (permalink)
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Quote:
Originally Posted by private_number View Post
How do i manage to "stick an OBD2" on it and read the code? I have never done this before, so sorry for my noobness fellas.
An again you have not said if you have the check engine light on.

With the question you asked my answer is find a good reliable garage, ask them how much it will cost to stick a reader on it. As for a certain members idiot comment about where you live. Don't worry about it more than likely the plug will be under your dash below steering wheel. Most of those cars were originally built and designed in Japan which drives on the same side as you. But that will not be an issue for you.

Ask around for a good cheep mechanic that will not rip you off to give you a reading and if necessary do a closed loop road test to simulate your problem with the reader plugged in.

This could save you a lot of guesswork and direct you to the problem. If you want to save money ask the mechanic what you need to do if it does code. If you have readable errors that light comes on (check engine). If it has not, first when you turn ignition key does it come on? If so its working and most likely if it is not on when running no reading will be had.

That puts you back to the previous suggestions by all.

Good luck and happy driving.

Good luck.
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Old 12-31-2009, 07:43 PM   #14 (permalink)
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Quote:
Originally Posted by private_number View Post
lmao. happy new years fellas and thanks for the replies

for the record, i resetted the ECU yesterday and drove around a bit and i noticed a good improvement when acceleration. as for the airfilter, it has not been changed yet but im getting a K&N filter soon. As for any error codes, i have not checked but seems like everything is back to normal

can i read the OBD codes myself? or do i need to go to toyota for that. if i can do it myself, what do i do? im still a bit confused in reading any error codes and its location (i know, drivers side underneath the dash. is it where the odometer is?)

but as good maintainance, i will get around to cleaning the throttle body sometime when i get my lowering springs.

once again, happy new year to all and thanks for all your help on this one!
private
You'll need a code reader/scanner. In the US, they're relatively cheap ($100 or so for a serviceable scanner, like here - the price on the web site is $139, but I got it for $85 on one of their sales), which lets you interrogate the common engine operating parameters (e.g., MAF readings, air temp, coolant temp, O2 readings, TPS readings, ECT readings, EGR, etc). You can also get a device that lets you interrogate the CAN from your laptop, and fetch most of the ECU parameters. There are some excellent books to explain the various data streams - or you could look at the O/L manuals at CamryStuff/

The reason I recommend a scanner is that some power softness issues don't set codes, but do show up as anomalous data streams. Getting at the data stream helps you to narrow down the search.
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Old 12-31-2009, 08:14 PM   #15 (permalink)
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you can take it to an autozone to check for any codes,they will do it for free
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