The ECU which stores the fault codes now needs resetting to tell the system that you have fixed the problem and will then do a quick check to satisfy itself. Usually most garages carry the tool for reset and won't charge you too much if anything at all.
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BMW defroster works on vacumm so if you have air blowing from the dash vents when the seclector is on A/C and when on bi-leval the air comes out of the dash vents and the floor vents then you have a vacumm leak most likely a vacumm hose is off, Or due to the age of the car the engine heat causes the hoses to crack and break. the BMW V-8 engine has a problem with the rubber holder for the PCV valves cracking and leaking that causes very low vacumm pressure also check all of the vacumm lines that go through the fire wall most likely your problem is just a disconnected or broken vacumm hose or the PCV valve holders.
various problems but mostly i find idle surging and droping over and ove r is a vaccume leak, or an intake leake somewhere, such as in the air filter housing, air intake tube, or at intake to manifold seal. check vacumm lines, air filter ect. fuel filter replacement wouldnt hurt, is there a check engine lite?
ok you have probably more than one problem first coolant leak im not sure which engine you have in your car but if it is the v six check at the tensioner there is to small ninty degree pipes they have orings on both ends of them and they typically start to leak motormite makes replacements for them if your car is continueslly running hot that can confuse your ecm and cause it to run lean or rich on fuel which will effect its idle small vacumm leaks can cause issues as well you can take throttle plate cleaner not carb cleaner and spray threw out your vacumm hoses it will idle up or choke out when you hit the hot spot for the leak im almost willing to bet you have a vaccum leak that whats causing your check engine light but however you have an upper hand for have a check engine light on thats the way your car is talking to you so dont ignore it take it in and have it scanned also because you have gm product it sets hard codes so have them pull all codes not just the current codes
your idle air control motor is messed up needs replaced first test with a voltmeter also check make sure you dont have no vacumm leaks pop the hood listen for a loud sucking noise check all vacumm lines make sure not came unplugged then check aic
Sound like your HVAC door from the blower fan is staying closed
and not letting any air blow through the ducts. You will need to
check the vacumm or electric actuator in the dash. If you can locate it,
manually pull the door actuator to see if it will open and let the cold or hot air get to the ducts to blow into the cabin. It's not really for beginners, but if you can actually get to the main door inside the dash, you might just have a broken vacumm line in the engine bay, that is
not actuating the door actuator. Check for any vacumm leaks, then if you find one, I'll bet you'll have your system fixed. Good luck.
the way you can check is to use a vacumm gauge hooked up to a constant vac source not throttle plate vacumm what you do is start the car and wacth the gauge if it fluctuates alot then you have a valve problem needle should stay steady a bove seventeen inches . if you rev the engine to 2500 rpms the gauge will drop to 5 inches and recover fairly quick if the gauge dose not climb over twenty or stays near o to 5 inches when you hold at 2500 rpms the cat or the exhaust is plugged.vac gauges dont cost very much 10.00 to twenty bucks. hope this helps thunderboltz.
Hi idle with no "check engine" lite , indicates a vacumm leak. Check all hoses for cracking or disconnection. Sometimes with engine running, you may hear a "hissing" coming from somewhere under the hood. Good luck. Moe
the problem is a vacumm leak , the control panel works with vacumm from engine supplied by small hoses and also have an vacumm tank under right front fender , check for disconnected hoses or break, the main vacumm hose is on engine intake manifold, ahh , also check control panel
Its called a pcv valve (positive crankcase valve) what year monte? The valve is for emissions you wont damage the engine but you will notice it idles higher and goes through more gas. you really need to get to the route of the problem. look for broken vaccum lines, engine light( is it on while car is running) the more you can find out the better you'll do getting to the bottom of it.
Could be a throttle position sensor going bad or a loose or leaking vacumm line or loose or worn wiring harness. You had mentioned the engine starts heating up. Do you mean overheating or operating above normal temperature? Sounds like a vacumm issue with the fluctuating idle. Check for worn vacumm lines and check to see if the vacumm is functioning. Sometimes a simple vacumm line with a loose connection or a small hole in it can affect your idle. Old lines are easily replaceable and an inexpensive place to start, then try your egr valve, pcv valve, brake booster vacumm line, oxygen sensor could be worn and affecting the mapping of fuel and air on the computer. Usually the check engine light will come on in this case.