idle too high ans TRAC OFF light problem

[lavalgrandam]

Hi!!!

Got a 2001 gand am 2.4l manual tranny ans manage to have 2
problem:

1: When i first start the car, idle manage to stay at approximatively to 1400 rpm. drive the car, and at a stop, manage to see that idle is still at 1400rpm even with a hot engine. NO SES light on, engine feel ok, maybee consuming a little more gaz but not so much. Changed plugs but still same problem. GM tech say should be around 750. Cleaned IAC 6 month ago.

2: TRAC OFF light manage to come out for no reason sometime. no ABS light on. Try to press the TRAC button but no use. Only way to shut down TRAC OFF light is to shut down the car. Cruise control work when TRAC OFF light is on.

Got any ideas?????

[rys99grandam]

How Many Miles?

Does the RPM Fluxate between the 1400 mark, or is it a SOLID 1400..... And Do you hear the engine sound like its reving high?

Does it start up, and go down? or solid 1400?

[dshpls]

My trac off light comes on when I start my car sometimes, no idea why tho... it sets of the Service vehicle soon light too, but when I retstart it's fine... I drive a 2001 too, cept it's a 3.4 GT

[lavalgrandam]

Originally posted by rys99grandam
How Many Miles?

Does the RPM Fluxate between the 1400 mark, or is it a SOLID 1400..... And Do you hear the engine sound like its reving high?

Does it start up, and go down? or solid 1400?

Non the rpm is solid at 1400, not major fluctuating(700 to 1500 and so....) and sor sure it semm ti rev a littlwe too high. Of couse i didn't check de vaccum for leak but i try to bypass that possibility!!

[lavalgrandam]

Originally posted by dshpls
My trac off light comes on when I start my car sometimes, no idea why tho... it sets of the Service vehicle soon light too, but when I retstart it's fine... I drive a 2001 too, cept it's a 3.4 GT

ok but me non sign of the SVS light on!!!!!

[rys99grandam]

I had an RPM issue a while back with a Saturn I had, I UNPLUGED the battery cable for an hour, reset the computer, and the idel smoothed out quite a bit.

You mentioned You cleaned the IAC valve was this happening before, or after you did this?

[Tebore]

You said you didn't check for vacuum leaks, well you better start checking.

[lavalgrandam]

Originally posted by rys99grandam
I had an RPM issue a while back with a Saturn I had, I UNPLUGED the battery cable for an hour, reset the computer, and the idel smoothed out quite a bit.

You mentioned You cleaned the IAC valve was this happening before, or after you did this?

I manage to clean the IAC valve this winter and i runned ok but the problem started since 1 month ago!!!

[FasTBird232]

Originally posted by lavalgrandam
2: TRAC OFF light manage to come out for no reason sometime. no ABS light on. Try to press the TRAC button but no use. Only way to shut down TRAC OFF light is to shut down the car. Cruise control work when TRAC OFF light is on.

Got any ideas?????

Bump, because I have this problem, too.

[carlover626]

Definitly look for vac leaks around the TB, you can do this by carefully spraying Carb cleaner (small amounts) on the vac lines and rubber connections when the car is running.
If the idle seems to fluctuate when you do this in a certain spot, you have found a source of the problem.
Also, does the idle seem to drop if you turn on the AC when it's idling at 1400?

[lavalgrandam]

Originally posted by carlover626
Definitly look for vac leaks around the TB, you can do this by carefully spraying Carb cleaner (small amounts) on the vac lines and rubber connections when the car is running.
If the idle seems to fluctuate when you do this in a certain spot, you have found a source of the problem.
Also, does the idle seem to drop if you turn on the AC when it's idling at 1400?

No problem for finding vacuum leak, i will use propane so it will raise idle if leak is present. Neither the AC is on or off the idle still remain at 1400 rpm.

:blake:

[carlover626]

Have you tried disconnecting the Neg. Batt. cable for 10-15 minutes?
When you are turning the AC off after it has been on can you hear a hissing sound?
Only other thing I can think of is the TPS sensor or the IAC valve causing the car to rev that high.

[pokesmot]

I had a buddy with a 2.4 had the same problem.

turned out to be a bent plate in the throttle body, a small gap was allowing air to get passed.

also check the TPS, and IAC.

[lavalgrandam]

Originally posted by carlover626
Have you tried disconnecting the Neg. Batt. cable for 10-15 minutes?
When you are turning the AC off after it has been on can you hear a hissing sound?
Only other thing I can think of is the TPS sensor or the IAC valve causing the car to rev that high.

Put some water over vacuum hoses,seal and intake manifold= no variation found, disconnected NEG terminal for 30 mins and start the car and leave it at idle for 20 min= same thing. Manage to see that when i put the AC on, it get 200rpm lower=normal condition. Put out again the IAC valve to check and everything is ok!!

Yes I was suspecting the TPS and/or IAC motor but not easy to check it out here without a scanner for parameters and when you work at a Ford Dealer and you got a GM car...loll

[pokesmot]

take the throttle body off the car, and use a flashlight to inspect the inside. If light is visible from the side opposite the light suspect a problem with the plate in the throttle body.

my buddy just ended up going to the scrap yard and replacing his whole throttle body.

[lavalgrandam]

Originally posted by pokesmot
take the throttle body off the car, and use a flashlight to inspect the inside. If light is visible from the side opposite the light suspect a problem with the plate in the throttle body.

my buddy just ended up going to the scrap yard and replacing his whole throttle body.

I can't remenber if a throttle body is build as the same as a caburator= if the throttle plate is 100% close at idle or 90-95% close like a carburator.

Question like that: Wondering if a clogged air filter will manage to raise the idle. I know that a clogged air filter let less air passes and engine have less power when needed.

[carlover626]

No if you have a clogged air filter the engine will not be able to idle. I am thinking the TPS sensor is giving a funky reading, but that would throw a code wouldn't it?

[lavalgrandam]

Originally posted by carlover626
No if you have a clogged air filter the engine will not be able to idle. I am thinking the TPS sensor is giving a funky reading, but that would throw a code wouldn't it?

Technically yes it would give me a code!! Where can I find specifications for TPS reading?? Manage to come back from vacations. Drive for at least 4 hous straight and when arrived at home at a light, idle was still as 1500-1600 rpm. Put for fun the ac ans dropped as 1200 rpm=still too high!! Hum wondering and hoping to find the problem because gas is f#$@#$ high here in montreal canada.

Could be a clogged fuel filter could also affect idle? Like if not sufficient pressure and flow ans affecting o2 sensor. But engine would really miss!!

[carlover626]

I am truely thinking TPS and/or IAC, the Fuel Filter would kill the idle and like you said I would think your car wouldn't run well if it was the 02.
Try disconnecting the Fuel Pressure Regulator vac line and see if that drops the RPM (maybe it's bad?)...
Sorry man, I hope this works out!

[red98grandamse]

just get whatever codes that are stored read... quit guessing...

If its the TPS, the IAC, or the O2 it will tell you when the codes are read. Also, your Ford dealership should be able to read those codes.. OBD2 is OBD2.. its the same codes on a ford as it is on your pontiac.

[lavalgrandam]

Originally posted by red98grandamse
just get whatever codes that are stored read... quit guessing...

If its the TPS, the IAC, or the O2 it will tell you when the codes are read. Also, your Ford dealership should be able to read those codes.. OBD2 is OBD2.. its the same codes on a ford as it is on your pontiac.

Only if the scanner read in generic!!! Ford use a different network language tran GM!!

[lavalgrandam]

does you guys have any idea to how to test if a IAC valve pintle is well seated in the trottle body to see if no air is passing when fully closed!

[red98grandamse]

Originally posted by lavalgrandam
Only if the scanner read in generic!!! Ford use a different network language tran GM!!

so i repeat myself.... find a place to read your codes. Quit messing around with it and find out whats really wrong with your car, there are about 20 possibilities right now, and only 2 ways to figure out what it is :1; read the codes, or 2. thorw money at it until it fixes the problem. Throwing money at it is definately the more expensive of the options here.

[carlover626]

I don't understand, is your CEL light on? If it is than go get the codes read for sure, just like Paul is saying.
I don't recall you saying you had an engine light on, but whatever go try to see if you have any codes stored that might give you a direction here. I didn't know I could have the history pulled from your OBD-2...I wonder what the cost of that is?

[red98grandamse]

my point is, if the TPS, IAC or any of those other senesors hes looking into are bad, the CEL will come on... if its not on, then those arent the problem, ans we are back to a vacuum leak or a partially open TB. MY vote is still, to completely remove the TB from the car, clean the hell out of it, and clean up the sensors just to be sure somethings not gunked up a little.

[lavalgrandam]

gonna put the obd-2 scanner today to get the codes. gonna give you some news soon!!

[lavalgrandam]

ok!!!! Put a code retreiver on the car and no codes came out!!
Next step is to see if the IAC vavle is working proprely with a IAC stepper

[carlover626]

http://www.gaownersclub.com/forum/showthread.php?s=&threadid=63232
Have you seen this thread?

[Pryce]

TRAC light on N bodies *USUALLY* means a speed sensor is going bad. I had many of those when I was working for GM. The only way to find out which is to put it on the (We had a TechII) diag computer.

[lavalgrandam]

Originally posted by Pryce
TRAC light on N bodies *USUALLY* means a speed sensor is going bad. I had many of those when I was working for GM. The only way to find out which is to put it on the (We had a TechII) diag computer.

ok but when a ABS sensor goes bad, the ABS light AND the TRAC light goes on!!!!

[lavalgrandam]

Originally posted by carlover626
http://www.gaownersclub.com/forum/showthread.php?s=&threadid=63232
Have you seen this thread?

Gonna put the car on a Snap On scanner tomorrow and see the PIDS of thoses TPS and IAC

[byrdmn]

I am in the same situation u are I am encountering s high idle at start up, and yes I checked the IAC it seemed ok I did replace the air temp sensor and I had no luck with that either. No check engine light. I cleaned the throttle body, checked for vacum leaks and etc. I am starting to think it is the IAC, but it isn't the cheapest sensor to just replace with out a pin point of the issue.
I'll keep u up to date om my condition

[Colin]

Originally posted by byrdmn
I am starting to think it is the IAC, but it isn't the cheapest sensor to just replace Try cleaning it first ... ;)

[lavalgrandam]

Originally posted by red98grandamse
my point is, if the TPS, IAC or any of those other senesors hes looking into are bad, the CEL will come on... if its not on, then those arent the problem, ans we are back to a vacuum leak or a partially open TB. MY vote is still, to completely remove the TB from the car, clean the hell out of it, and clean up the sensors just to be sure somethings not gunked up a little.

Ok!!! We got a winning solution!!!! TPS was bad! I explain:

Put a snap on scanner on it to read the PID and play with the IAC motor. Everything was ok and fully functionnal! Manage to check the TPS voltage at idle: less than 1 volt=ok but TPS % opening was a 7%. Remove the TPS and close it completely while the engine was running. PRESTO!! Engine dropped at 900-1000 RPM. Put back the TPS,shut the engine off,start and came back a 1600 RPM. ;) Gonna check monday for price!!!

[FasTBird232]

Damn, I replaced my TPS and it still starts up and goes straight to 2500 rpm for about ten seconds. You say you just unbolted it and twisted it to the fully closed position and it fixed it?

[lavalgrandam]

Originally posted by FasTBird232
Damn, I replaced my TPS and it still starts up and goes straight to 2500 rpm for about ten seconds. You say you just unbolted it and twisted it to the fully closed position and it fixed it?

I remove it completely and turn it completely to the close position.
TPS senson are not ajustables. Best thing to do is to check the PID.

[carlover626]

Hey can you explain the PID?
Maybe it's my beginner knowledge, but I can't recall what that is...

[lavalgrandam]

Originally posted by carlover626
Hey can you explain the PID?
Maybe it's my beginner knowledge, but I can't recall what that is...

PID is the term for: Parameter Identifier. Identifies an address in PCM memory which contains operating information. Like my TPS when it is at fully close,the PID (voltage reading) is less than 1 volt ans when it is WOT, PID is more than 4 volt.

[lavalgrandam]

Now my another problem!!! My TRAC light come on by itself, ABS working and cruise also. Pushing the TRACK OFF switch doesn't shut down the light. No SES,ABS or other light on. And no, All my wheel sensors are ok loll because when abs sensor goes bads, they manage to light up both ABS AND TRAC lights and cruise control won't operate.( I know because I did got a ABS sensor problem loll)

[lavalgrandam]

godddamn. Put a brand new GM TPS sensor and it still run at 1600 RPM. Gonna try to check if throttle body have something.

2 thing to know:

1: Is the throttle body gasket reusable???
2: Where can I found on the web the wiring diagram, pins voltages,sensors specs or shop manual for 2001 2.4liter.

[MichaelS]

Hey All,

I'm sorry I haven't been on the board for a while now, but in relation to this topic, has anyone considered replacing the Coolant Temperature Sensor? I know that on my old car, the RPM was controlled by that sensor, so as the car warms up, the ECM tries to lower the RPM.

Regards,

Michael

[lavalgrandam]

Originally posted by MichaelS
Hey All,

I'm sorry I haven't been on the board for a while now, but in relation to this topic, has anyone considered replacing the Coolant Temperature Sensor? I know that on my old car, the RPM was controlled by that sensor, so as the car warms up, the ECM tries to lower the RPM.

Regards,

Michael

no the problen is alway there even when the engine is hot and the pid show the godd temperature!!!

[lavalgrandam]

AT LAST!!!!! Pray the lord!!!! Find the prob!! Juste manage to go at my old job at Saturn dealer and put ste scanner on it!. Alway the same shit! So we manage to make a PCM update.... Well what do you know.... Idle manage to go bact at 900 rpm ans everything ok on the highway!!!!!! Yahoo!!!!!!