01 corolla LE

ok guys.. I have a 2001 Toyota Corolla LE

my car idles low when starting, hesitates when accelerating and when I start it during cold weather sometimes it stalls 1 or 2 times before it finally gets going..

I have changed the spark plugs, cleaned the intake manifold, changed air filter, had the mechanics at toyota look at all the sensors related to intake and exhaust (O2 sensor, MAF sensors). I still can't find the problem, other than speculating that it is my performance exhaust. However, many other corollas in my carclub has performance exhaust (non-TRD) and their car does not idle weird like mine.

I have changed my oil regularly every 5000 KM and I use mobil 1 full synthetic.. maintainance has been done according to service plan (except for oil changes are done more frequently instead of suggested 6 months or 8000 km) .. oh btw.. the engine has 62500 KM on it.. it's still VERY young.

Please help me with this problem .. it's only getting worse.

I am part of corollacustomz.com, northeasterntuners.com, toyota-nation.com etc etc.. I've laready asked help from there and no one has responded or rather solved the problem.

Have you tried sea foam?

nope not at the moment.. I tried putting fuel injector cleaner.. haven't ran w/o it for about 5 k kms now.. maybe it'll help?

*edit* type o

How are your battery contacts?

battery contacts are a bit dirty.. they were corroded.. but I cleaned them off and made sure that my engine grounds are ok

Possibility of a vacuum leak

all I can think of then, is the vacuum, or fuel injection.

can it be a clogged fuel filter or bad fuel pump?

I hope it's not the fuel filter, b/c you'd have to service/replace the entire fuel pump then.

yup I know.. it could even be a weak ignition coil.. it seems to start better tonite when I cranked it.. but the prior time it stalled 4 times before starting up

I'd say throw in the whole lot of fuel injector cleaners, Sea foam, etc. and see how many people you can piss off in your neighborhood, as drive around leaving plumes of smoke.

I'd say throw in the whole lot of fuel injector cleaners, Sea foam, etc. and see how many people you can piss off in your neighborhood, as drive around leaving plumes of smoke.

haha my car doesn't smoke right now. it's only a starting up problem.. I've checked all the routine things.. hence I've been in a automechanic course through highschool and been maint. my car regularily...

Actually, I meant that once you pour some seafoam into the engine...well...you'll see what I mean.

Have you tried to swap the coil?

for the 1zz engine (with VVTI), the coils are directly ontop the sparkplugs. So that would mean that it could possibly be one of those coils. I told toyota to check them out, but they claim that they never fail..... then they gave me fucking BS that powertrain warrenty is suspension and exhaust.. fucking liers.. I'm gonna switch dealerships..

every time I bring my car in.. they give me attitude.. yeah so I'm 21 years old... doesn't mean I'm a complete idiot.