When my 03 impala did that it was because the egr tube had become loose its located directly under the throttle body and caused a huge vacuum leak I had to remove the upper plenum to get to it good luck
I just change my sensor for the mass air flow on my 2003 Impala as well. It was running okay, then started to start poorly sometimes taking three times to get it going. Usually it would drive okay once I got going but now it started poorly and stayed running poorly idling horrible until it died completely on me. I need help!
Plastic Intake Manifold must have a crack somewhere..? You have an intake leak somewhere sucking in too much air..? A Vacuum Leak from a cracked or brittle hose..!
I noticed your temperature slightly going up is that normal? In my impala it sits a little under the middle and when I'm at a stop light for to long it goes up alittle to the middle and sometimes alittle over the middle.
I have a 98 chevy Malibu v-6, it's cold natured and I got in it the other day and it would go in gear but it was running high rpms when I put gas to it, it just sounded ruff like it was gonna blow up, so I kill it, and restart it, same thing, kill it and restart it. Same thing, I go to restart it and it wont start. Its been setting since , got a new battery, still won't start, acts like the starter, flywheel will catch like it wants to start, turn motor over, just wont start.
I have the issue of when I crank my car in park it will cut on and itll stay on as long as I give it gas, but when I stop gasing it then it dies. I can "drive" it but not healthy. I've replaced the air control valve already and still same problem. I have work in 3 days, I need help.
It is definitely an air flow problem. The fact that you can keep it running with the gas is because you are pulling in more air when you do that. My problem was the ECM which controls the intake mixture. If you manually open the butterfly valve and get better results, I would say the ECM is a good bet.
By the air control valve, you mean the IAT (intake air temperature) sensor or the MAF (mass air flow) sensor, or something else? If you have replaced both of these and dont know much about cars, time to see a mechanic. Replacing an ECM can be done on your own, but when you buy it the device has to be programmed to your VIN number
Hi I am really late for this video but I was hoping someone could help me. I have a 2004 Mistubishi Lancer and it has a big problem with going into a high idle when the ac is on (sometimes when it's off too) as well as sometimes having trouble going into an idle at all. We've had the throttle plate cleaned and I think the air valve replaced that senses all that stuff and they want us to replace the computer chip part for the vehicle to fix it. I think it's called a PMC? Is that really what may fix it/what worked for you?
It's either the ECM or the PCM, but basically the solution for my vehicle in this video was to replace that component. The PCM is the computer in the vehicle that takes all the information from the IAC, O2 sensors, and other sensors, then adjusts the throttle plate to allow the appropriate airflow into the engine. Basically, if it is slow, or not reading the information correctly, it can cause incorrect gas/air mixture, which in turn causes the erratic idle. Think of it like water coming out of your sink, but you have air in the line, so the water keeps coming out in bursts and not consistent. Hopefully this helps. Yes, the PCM is expensive, but most likely worth it to save the vehicle.
@@somanynamesilltrythis0180 I took it to the dealer to have it flashed. Drove the car up there then installed the ecm in the parking lot. It was $90 to have them flash it
Rich Moffit A shop diagnosed my 2003, v3.4 Impala with a bad TPS. They replaced it and it idles perfectly now. I had also replaced Fuel Filter and air filter and thoroughly cleaned throttle body, IAC and MAF. I read somewhere that the pigtails for the sensors can go bad. Jeremy, I wonder if a scan tool would give you different voltage readings (because of bad wiring or connectors) than what you would get if you pinned into the TPS with a volt meter. It sounds like you've tried the TPS from the working car, but what if the pigtails or connectors are bad? Or, perhaps data from another sensor is off. Did you say the high idle occurs at startup or only after running a few minutes? Mine occurred at start up. If yours occurs after running a few minutes, I wonder if it is a leaking upper or lower manifold gasket?
Rich Moffit Thank you for the response Rich. I have tested the voltage coming to the TPS, and it all reads well. Unplugging the TPS does effect it, so it does realize that there is no longer a sensor there. I actually get it to throw a code when I do that. I did misquote a little bit. The idle is erratic. Sometimes it will happen right when starting the vehicle. I tried blowing smoke into it, but I did not see any leaks from the manifold. That does not mean that it's good, but I don't see it as bad.
Rich Moffit Found the solution. Bad PCM. SOLUTION IS HERE! www.impalaforums.com/chevy-impala-7th-gen-discussion/808089-increasing-high-idle-in-park-2003-3-8l-7.html#post2317953
That's a good guess. But found out eventually through a lot of trial and error that my ECM was going out. So basically the computer was not processing the sensors correctly.
Just try resetting the ECM. Unhook the battery cables zip tie the together, not connected to battery for 15 mins. Like trump says what do u have to loose.. Lol
If your throttle position sensor goes bad(tps) , the computer will put the car on safe or "limp" mode. This is typical. It is located above the idle air control valve on the throttle body. Good luck.
SERGIO ALBERTO ACERO BORRAZ they do get thirsty. and the oils in the antifreeze also protect from wear and Heat buildup from friction. crazy ain't it. I was going to call them all liars too but then I looked it up. turns out you're supposed to have some water in there just don't try and substitute it with soda
When my 03 impala did that it was because the egr tube had become loose its located directly under the throttle body and caused a huge vacuum leak I had to remove the upper plenum to get to it good luck
Changed the Mass Airflow Sensor on my 03 impala and I get the car idling normally almost every 3rd start up.
Sounds like a start. Have you check the Air Intake Valve sensor? (IAC)
I just change my sensor for the mass air flow on my 2003 Impala as well. It was running okay, then started to start poorly sometimes taking three times to get it going. Usually it would drive okay once I got going but now it started poorly and stayed running poorly idling horrible until it died completely on me. I need help!
@@gwantspeace6541I have the same exact issue on my 04. Don’t understand what’s wrong
Plastic Intake Manifold must have a crack somewhere..?
You have an intake leak somewhere sucking in too much air..?
A Vacuum Leak from a cracked or brittle hose..!
yep im havin da same problem with my 03 chevy impala can some one tell me what da issue
check your intake gasket
Mine does that sort of the throttle cable is messed up. Its just held on with plastic clips they broke, now its held down with zipties.
I noticed your temperature slightly going up is that normal? In my impala it sits a little under the middle and when I'm at a stop light for to long it goes up alittle to the middle and sometimes alittle over the middle.
i have a 02 chevy impala 3.8 and mine only does it when it is at operateing temp it revs up to 2grand and want idle back down till cooled off
I have a 98 chevy Malibu v-6, it's cold natured and I got in it the other day and it would go in gear but it was running high rpms when I put gas to it, it just sounded ruff like it was gonna blow up, so I kill it, and restart it, same thing, kill it and restart it. Same thing, I go to restart it and it wont start. Its been setting since , got a new battery, still won't start, acts like the starter, flywheel will catch like it wants to start, turn motor over, just wont start.
Any codes coming up on it? If it is running rough with high RPM's I would ✔️ your spark plugs. Sounds like a misfire
I am having this problem with 05 impala ss still havent found a way to fix it
What have you replaced? My answer to fix it was the ECM
I have the issue of when I crank my car in park it will cut on and itll stay on as long as I give it gas, but when I stop gasing it then it dies. I can "drive" it but not healthy. I've replaced the air control valve already and still same problem. I have work in 3 days, I need help.
It is definitely an air flow problem. The fact that you can keep it running with the gas is because you are pulling in more air when you do that.
My problem was the ECM which controls the intake mixture. If you manually open the butterfly valve and get better results, I would say the ECM is a good bet.
@@leoismylastname I dont know to much about cars and to be honest I dont know where to look
By the air control valve, you mean the IAT (intake air temperature) sensor or the MAF (mass air flow) sensor, or something else? If you have replaced both of these and dont know much about cars, time to see a mechanic. Replacing an ECM can be done on your own, but when you buy it the device has to be programmed to your VIN number
.
My RPMS keep flucating up and down while driving and at idle basically, is it the idle air control valve??
Very possible. Does it stay steady in park?
J Leo in park the rpms are fine
@@lukeirwin1608 then IAC is most likely. Next I think would be Mass Air Flow Sensor
Hi I am really late for this video but I was hoping someone could help me. I have a 2004 Mistubishi Lancer and it has a big problem with going into a high idle when the ac is on (sometimes when it's off too) as well as sometimes having trouble going into an idle at all. We've had the throttle plate cleaned and I think the air valve replaced that senses all that stuff and they want us to replace the computer chip part for the vehicle to fix it. I think it's called a PMC? Is that really what may fix it/what worked for you?
It's either the ECM or the PCM, but basically the solution for my vehicle in this video was to replace that component. The PCM is the computer in the vehicle that takes all the information from the IAC, O2 sensors, and other sensors, then adjusts the throttle plate to allow the appropriate airflow into the engine. Basically, if it is slow, or not reading the information correctly, it can cause incorrect gas/air mixture, which in turn causes the erratic idle. Think of it like water coming out of your sink, but you have air in the line, so the water keeps coming out in bursts and not consistent. Hopefully this helps. Yes, the PCM is expensive, but most likely worth it to save the vehicle.
Does it stall all the time?
The fix for mine idling high like that was a problem in the ECM. Got a new one and had it flashed and no more issues
That's exactly what it was! I had already posted that, but thank you for one more voice to help others :)
U could have unplugged the battery both cables and let the rest of the current flow out of thr pcm and plugged it back in... Fixed for free
Where do you go to have the new ecm flashed? Is it possible to do with a scan tool?
@@somanynamesilltrythis0180 I took it to the dealer to have it flashed. Drove the car up there then installed the ecm in the parking lot. It was $90 to have them flash it
@@cwheels22 ok thank you
Yep, same problem here with a 2003, v3.4
Rich Moffit A shop diagnosed my 2003, v3.4 Impala with a bad TPS. They replaced it and it idles perfectly now. I had also replaced Fuel Filter and air filter and thoroughly cleaned throttle body, IAC and MAF. I read somewhere that the pigtails for the sensors can go bad. Jeremy, I wonder if a scan tool would give you different voltage readings (because of bad wiring or connectors) than what you would get if you pinned into the TPS with a volt meter. It sounds like you've tried the TPS from the working car, but what if the pigtails or connectors are bad? Or, perhaps data from another sensor is off. Did you say the high idle occurs at startup or only after running a few minutes? Mine occurred at start up. If yours occurs after running a few minutes, I wonder if it is a leaking upper or lower manifold gasket?
Rich Moffit Thank you for the response Rich. I have tested the voltage coming to the TPS, and it all reads well. Unplugging the TPS does effect it, so it does realize that there is no longer a sensor there. I actually get it to throw a code when I do that. I did misquote a little bit. The idle is erratic. Sometimes it will happen right when starting the vehicle. I tried blowing smoke into it, but I did not see any leaks from the manifold. That does not mean that it's good, but I don't see it as bad.
Rich Moffit Found the solution. Bad PCM. SOLUTION IS HERE! www.impalaforums.com/chevy-impala-7th-gen-discussion/808089-increasing-high-idle-in-park-2003-3-8l-7.html#post2317953
I'm thinking it's the idle air control valve give that a shot.
I did replace that, but no luck. I posted the solution, but basically the ECM needed replaced. The computer was bad.
Vaccum leak ??
That's a good guess. But found out eventually through a lot of trial and error that my ECM was going out. So basically the computer was not processing the sensors correctly.
Just try resetting the ECM. Unhook the battery cables zip tie the together, not connected to battery for 15 mins. Like trump says what do u have to loose..
Lol
Where is the ecm
If I remember right, it's near the air intake manifold
Demon car
i having @ problem with my chevy impala 03 3.8
wont go passes 4000 rpm wht can be da problem
If your throttle position sensor goes bad(tps) , the computer will put the car on safe or "limp" mode. This is typical. It is located above the idle air control valve on the throttle body. Good luck.
aic valves sensor
Actually ended up being the ECM and bad, but thank you for the suggestion!
Clean your egr valve
Because u replaced it
IAC valve on throttle body
That's a good guess, but it turned out the ECM was bad, not the sensor
If you wash your car, it runs better!
clean the MAF
my car have water in motor for what?
SERGIO ALBERTO ACERO BORRAZ they do get thirsty. and the oils in the antifreeze also protect from wear and Heat buildup from friction. crazy ain't it. I was going to call them all liars too but then I looked it up. turns out you're supposed to have some water in there just don't try and substitute it with soda
Throttle body relearn
Vacuum leak