Rough Idling Today

[Blue Batmobile]

Okay, my car was idling rough today for some reason. When I came to a complete stop at intersections, the idle dropped down to around 400rpm's. Usually it idle's around 700-800rpms. felt like it was going to stall, but it didn't. I have no engine mods, so I'm not sure what it could be. Anyone ever experience this?

Bat

[kuruptgt]

i hope u mean hundred and not thousand:D

[Blue Batmobile]

oops!;).

bat

[Masayver]

I think this is a pretty common occurence, as it's been posted about before. Mine did it more frequently with the stock intake and has done it less with my CAI.

[Silversliver]

Mine does that too but only when the cars been running for a long time. However, there is no odd idling sounds/vibrations from the engine.

[Blue Batmobile]

Like I said before, my car hasn't stalled yet, and I haven't heard of any other similar incidents where the car stalled. Kind of bothersome though. I posted this thread because this is the first time it's rough idled below 700 rpms on numerous stops.

bat

[DaksGT]

Originally posted by Blue Batmobile
Like I said before, my car hasn't stalled yet, and I haven't heard of any other similar incidents where the car stalled. Kind of bothersome though. I posted this thread because this is the first time it's rough idled below 700 rpms on numerous stops.

bat
mine'll do that after driving constantly at a fsat speed on the highway like 170 for 7 or 8 mins. And then when I come to a stop light it'll do that for like 7 secs

[mirconrice]

don't worry about that, from what I know, its the ECU learning...it goes away after you start moving right?? my did that from time to time.

[Bling]

Mine usually does it if I coast to a stop with the car in nuetral. If I downshift to help stop, it doesn't do it.

[Dealer Xing]

when I used to own my GTS it did the same thing too, especially after 5 mins from a cold start. There should be nothing wrong with it, it's called Toyota secret engineering.

I had more complains about idle vibration at anytime, any weather though. This car sucks. Even the beater cars I owned idled quieter.

[Blue Batmobile]

I knew it was a common thing, because I've seen this topic posted many a time. It just aggrivates me that this happens:mad:!

Bat

[RedNOSceli]

Originally posted by Dealer Xing
when I used to own my GTS it did the same thing too, especially after 5 mins from a cold start. There should be nothing wrong with it, it's called Toyota secret engineering.




lol, toyota secret engineering!:D

[MarcMichaud]

I get that same probley all the time. Usually after a 30 minute drive. I have had my Idle looked at by Toyota like 5 times. They dont see nothing wrong. My car has never stalled though but its annoying. We should just Tighten the Throttle cable and that should solve all our problems...

Marc

[Blue Batmobile]

Same here, when I took it to the dealer the last couple of times to check it out, they didn't find anything wrong:sad .

bat

[BulracerGT'01]

Hey Bat thats most probably the new wing,hehe:D

[KSilver2000]

Mine idles sometimes at low RPM's too. But in the last week or so, sometimes it has been idling at 1100 RPM's. However if I give it some gas and then let it idle, it drops down to normal at 750 RPM. My clutch is very good still and everything but don't seem to know why so high, or is that not high? It used to idle at like 750 RPM.

[kocheroni]

I think this all comes down to the gas conservation type thing. For instance, I'm sure honda's idle low also while at a stop light. It's just to save gas, the engine will slow down in order to keep a better gas mileage.

[Blue Batmobile]

Idling low is one thing, but so low that the engine sputters and seems like it's going to stall:confused: !

Bat

[jcar]

It happenned to me again today, it almost feels like the valve timing is staying advanced, because the car runs great at higher rpms, but at idle it sputters. Possibly a glitch with the VVTi??

[redlineGTS]

same here it started doing that after a year i got my car. it usually happens when i stop at the redlight real quick and put it in neutral.

[TaeMachine]

it happened one time to me. i was coming to a stop at a light and felt it. i thought nothing of it at first but when the light turned green and the car didnt move, i realized that the engine shut off.

it only happened once and my car was well warmed up. no mods either.

[FriedRice]

i posted this before... same problem... cept i have an auto....

basically after longer periods of cruising at high speeds and stuff... brake to a stop, and at that stop i've gotten low revs/rumbling/shaking.. but then i rev a lil and everythings back to normal....

so far no major problems related to it.. if anything happens, i guess were gonna have to post on here so everyone knows....

happened a total of 3 times

[BiZzyCeLiGT]

Originally posted by Blue Batmobile
Idling low is one thing, but so low that the engine sputters and seems like it's going to stall:confused: !

Bat

it prob yur idle control valve. I had the same problem and took it to toyota and they said it was the idle control valve. i got it replaced and havent had the problem since.....

[Blue Batmobile]

Originally posted by jcar
It happenned to me again today, it almost feels like the valve timing is staying advanced, because the car runs great at higher rpms, but at idle it sputters. Possibly a glitch with the VVTi??

Nice to know someone still use's the SEARCH function:thumbup:

Bat

[Chris25NJ]

happens to me every once in a while as well

[Blue Batmobile]

I think it's pretty normal, just as long as you don't stall:eek:

Bat

[nudge1201]

has anyone else had there engine rev it self at stop?? mine has done a couple time bouncing from 1000 to about 1800 rpm continuosly, also where it idle at warm up speed after youv'e been driving it for 20 min plus?

[WRENCHHEAD]

yea it's always after cruzin for a while that it happens, also i noticed it doesn't do it as much when i used mobil gas, i was usin cheveron before that, maybe the techron stuff is bad for the car?... what gas you guys using??

[KSilver2000]

Originally posted by nudge1201
has anyone else had there engine rev it self at stop?? mine has done a couple time bouncing from 1000 to about 1800 rpm continuosly, also where it idle at warm up speed after youv'e been driving it for 20 min plus?

Exactly same thing happens to me. But it also happens after I drive around revving it pretty hard, about 45000 RPM on the streets.

[Griffin]

Originally posted by WRENCHHEAD
yea it's always after cruzin for a while that it happens, also i noticed it doesn't do it as much when i used mobil gas, i was usin cheveron before that, maybe the techron stuff is bad for the car?... what gas you guys using??

Acutually all the analysis I have seen indicates that Chevron is pretty damn good stuff on average. Techron is more than just a marketing stunt. Mobil on the other hand has been seen to have excessive sulfur levels as much as 8 TIMES that of other brands in certain areas of the country. But it seems to relate more to teh refinery that you get your gas from than to the specific brand. Its also not a consistant thing, idividual areas will vary over time even form teh same refineries. The only exception we saw was that Chevron maintained consistently low sulfur levels. We aren't sure why but supposedly they have a couple refining processes patented that they aren't sharing. O course maybe your local Mobil refinery is better than your local Chevron refinery.

Griffin

[Griffin]

Out of curiosity does this seem to happen most when coasting to a stop after a fairly decent length cruise within a day or 2 after filling up with gas?

Griffin

[jcar]

looks like MAF sensor problem after doing more research:

<a href="http://www.ameritech.net/users/kevba/vw.html"></a>

[jcar]

<a href="http://www.ameritech.net/users/kevba/vw.html">http://www.ameritech.net/users/kevba/vw.html</a>

[DavidYan]

its the idle air control valve, it is meant to either allow a little more air or a little less air in the engine during idle at certain times for ex. when you turn on the A/C the valve opens a little bit to raise the rpm, or when the engines cold the car idles high. why does it do it at random times i dont know.

[Chris25NJ]

the only time my car ever revved up high by itself is in the winter, when i first start the car and it's warming up.

but it does rev low like described above every once in a while, usually happens not long after starting the car, then goes away

[nexceli216]

i have a 00 gt w/ cai, header, exhaust. car seems to doing the same thing but mine bounces from 400-1100. very sluggish take off. slight hesitation thru 2-3 gears. my car actually has stalled plenty of times after the rpms bounce and go too low for too long.
also got cel, took it to autozone for free diagnostic. got a code 175 or to toyota po175. can you believe the toyota service guy just gave me the book to look it up myself...after i told him where i got the diagnostic:) but the code said i was running too rich!?!
and yes i did find it in the thick a** diagnostic book!! till today still trying to find out why my car stalls and is running too rich. maybe a vaccum leak or ?? pretty sure clutch is ok, cel goes off and comes back, i hope i find the answer in this thread!!

[Griffin]

Originally posted by nexceli216
i have a 00 gt w/ cai, header, exhaust. car seems to doing the same thing but mine bounces from 400-1100. very sluggish take off. slight hesitation thru 2-3 gears. my car actually has stalled plenty of times after the rpms bounce and go too low for too long.
also got cel, took it to autozone for free diagnostic. got a code 175 or to toyota po175. can you believe the toyota service guy just gave me the book to look it up myself...after i told him where i got the diagnostic:) but the code said i was running too rich!?!
and yes i did find it in the thick a** diagnostic book!! till today still trying to find out why my car stalls and is running too rich. maybe a vaccum leak or ?? pretty sure clutch is ok, cel goes off and comes back, i hope i find the answer in this thread!!

Sure it wasn't P0172?

anyways could be a bad MAF, O2, leaky injector, saturated charcoal canister from over-filling gas tank, or evap stuck in purge mode all the time.

Griffin

[2002GT_Celica]

I have the opposite problem. My car will idle high in the 1.5k range until it warms up. But when I went in for my regular check they found nothing wrong. I guess it is just normal, since I have heard of other people having the same problem.

[DaksGT]

Just an FYI I have an HKS AFR and it has the EIDS function and my car has never done it since.

[nexceli216]

sorry griffin that is what i meant...PO172. could those probs you listed above be caused by adding mods? could it be possible the maf has oil on it from when i cleaned my intake filter? but would that cause me to go rich?

[nexceli216]

OH YEAH... forgot to mention that the car usually accelerates at its best only at wot. accelerating any where else on the gas pedal just feels jerky or sluggish. could it also be that my throttle position is off by a little? would that cause me to go rich?

[Griffin]

Originally posted by nexceli216
sorry griffin that is what i meant...PO172. could those probs you listed above be caused by adding mods? could it be possible the maf has oil on it from when i cleaned my intake filter? but would that cause me to go rich?

Yeah that could do it for sure. If the MAF is falsely reporting a quantity of air entering the engine that is greater than the actuality, then the base fuel calculation will cause the vehicle to run rich. At that point the ECM will correct with fuel trim, and when the trim exceeds 20% negative it pops the P0172. This can also be caused by a S-AFC type device as their function is to lie to the eCM about the quantity of air entering the engine.

Griffin

[RedNOSceli]

Originally posted by Griffin


Yeah that could do it for sure. If the MAF is falsely reporting a quantity of air entering the engine that is greater than the actuality, then the base fuel calculation will cause the vehicle to run rich. At that point the ECM will correct with fuel trim, and when the trim exceeds 20% negative it pops the P0172. This can also be caused by a S-AFC type device as their function is to lie to the eCM about the quantity of air entering the engine.

Griffin
I assume youre a Toy tech?

[Griffin]

Originally posted by RedNOSceli

I assume youre a Toy tech?

Not exactly :) - Used to be though.

Griffin

[celicatalk]

Where is the idle control valve located on the 02 GTS? I have two strange idle sounds that may not be normal. One sounds like a light 5-10 second "grrrrrrrrrrr -long pause- grrrrrrrrrrrrrrr" and sometimes over and over, almost like a servo motor is kicking in. The other is a light knocking sound when the car is idleing/parked with the foot break off. Any ideas?