Try cleaning your throttle body. There is a very good DIY procedure, I believe, on the 5 generation Camry forum. It is written by hardtopte72.

Good luck,
Sam

 

For those of us down south, that's 56mph, so I would say (2012 is the same as 2010, right?) 2000 rpm is 4th gear and 3000 rpm (or so) is 3rd gear. For some reason, it's not going into 4th (or staying there) like it should (unless you're going uphill). Any check engine lights or other lights on dash? Maybe try to read for codes even if no error lights.

 

jake, we have a confusion

Hey Jake, so Yesterday drove back to Home , the same 8-9 Miles as usual & didn't have any issue like this while driving. Nor did I have it today. no engine/warning lights whatsoever.

Like I said, It's feels as if I completely let go of the gas pedal, when in fact my foot hasn't moved. The RPM starts dropping & comes back after 5-6 seconds, unless I actually pull my foot off the gas & put it back on whereby the effect is instantaneous.

This is like the singing frog in cartoons that pretends to be perfectly normal when in front of a crowd.

How do I explain this to the mechanic when its there sometimes, not there sometimes. :frown:

 

Hey Somick, so I donno man, this feels like a transmission problem of sorts, i guess.

 

When you said "RPM suddenly dropped from 3000 to 2000", then by "suddenly" it pretty much has to be a shift, and in this description (about 90kph), then it's a shift from 3rd to 4th. I'm assuming your speed didn't change much? And I assume you hear the motor revving higher.

It's also possible you were going at a critical speed where the transmission is "hunting" between 3rd and 4th. Go a little faster and it will choose 4th, go a little slower and it will choose 3rd. And, a slight change in pressing the gas pedal can make it shift (slightly softer and it upshifts to 4th; slightly harder and it downshifts 3rd). This is usually noticed more on uphills than on flat ground.

But since I'm not experiencing it, I can't be sure of anything! If I assume it was running along at 3000rpm (which is a little high unless you are going quite a bit faster, say 112kph/70mph, in 4th), then it was in 3rd. If so and you are running along and the rpms drop to 2000, then you could try moving the shifter to "3" and see if the rpms go back where they were.

Then the questions become . . . is this just normal hunting? . . . or is this car a little too sensitive to hunting? . . . if it is too sensitive, is it worth trying to get it diagnosed and maybe fixed? . . . instead of spending time and money chasing, do you want to just override it by keeping in "3" unless you go over 90 kph? Sorry, I can't answer!!

 

Jake, Lean Burn, It's an automatic transmission

Hey Jake, it's an Auto transmission, I'm in Dubai & the traffic can get crazy here...that's why opted for Auto.

The thing is, the road to the office has a limit of 80 kph, (+20 kph grace speed allowed). So, I'm always riding at 90 kph. But You were RIGHT. RPM stays at 2500 (not 3000) at 90 kph, then suddenly starts dropping to 2000 and slightly below (foot on gas hasn't moved at all),so I give it slightly more gas out of fear that it doesn't stall on the track or something, upon then the RPM rises to 3000 with a surge in acceleration as if I'd been intentionally over-revving it.

Also if when experiencing the drop, if I immediately raise my foot of the gas completely & step back on it, The Power drop stops immediately & I regain control of the RPM.

Does the above explanation help ? If yes, please help. :crying:

 

If the transmission isn't shifting it might but a temporary fuel supply drop. Sometimes a plugging fuel filter will exhibit that kind of behavior. If it is, it will happen more and more until it just stops fuel flow entirely.

More information would be helpful...

 

Yes, we have been discussing (and assuming) an automatic.

It sounds to me like you are at the critical speed between 3rd and 4th. 3rd shows higher rpm and more power. 4th shows lower rpm and less power (and maybe better gas mileage).

If it shifts back and forth ("hunting") then you can avoid this, if you want, by moving the shifter to "3" instead of "D". Too much hunting isn't good for the transmission anyway. "Too much" is subjective, but maybe more than 3 shifts per minute or so is "too much".

[added on edit] I didn't realize you were in another part of the world, so I have discussed the characteristics of a US 1.8L 4-speed automatic Corolla. Less powerful engines in some parts of the world would be even more subject to hunting.

 

@jake111 : bro, you're not far off. It's actually a 1.6 L 4 speed-Auto. Car Regist. details show that This particular piece was Made In Taiwan..... But What you said is definitely worth a shot. Will try driving in '3' instead of 'D' gear & update. Thanks