rpms bounce when ac is on

My Car Shakes While Idling – What now? Joined Dec 24, 2004. AC compressor is a smaller engine in itself and puts a lot of stress on car’s engine. 2001 dodge dakota 3.9l rough idle at start up rpms bounce around then engine dies, sag, and surge when in a pull like - Answered by a verified Dodge Mechanic. This is not that. DC controls adjust speed by varying the voltage sent to the motor (this differs from AC motor controls which adjust the line frequency to the motor). Now release the throttle and watch the gauge as the speed drops. Note the vacuum readings, and any fluctuations, at each speed. I have a 2012 Fusion and when the AC is on or defrost I get this groaning sound. when im at a stop light or parked, my 98 Honda Accord Rpm will automatically move up a little, like if im stepping on the gas pedal, which im not so it’s kinda weird, and when the rpm goes up, it makes my car move forward, so i have to step on the brake harder to keep it from moving. If your vehicle is falling below or rising above this you may be dealing with an idling issue. It's not dependent on RPM. I’m not 100% sure but the last two times, the AC was on/may have been just switched off (also the car is warmed up by this time). When the car is of I have 12.4 volts. Sometimes continuously, other times, just a couple times. The rpms on my 2006 Dodge Dakota are jumping up while driving on the interstate. Could this be a problem? The RPM fluctuates continuously by a few hundred RPM's. When the compression kicks in, the idle goes to 850 without dopping, likes it's supposed I think. my car has the same exact symtoms with the rpms moving up and down it only got worse finally i lost acceleration and the cause was a bad throttle body its an electronic part and i have 69000 miles on a 99 1.8t also i would check there just because its clean doesnt mean its working properly. understanding air conditioning gauges. Be more concerned with your RPMs when driving the Traverse. Pulley bearing wear. 110 1. Currently the engine starts and revs to 2000 rpm then will slowly start to drop to about 900 (the usual cold engine idle speed, no ac) It will hold steady there for a bit then start to bounce a little with an occasional drop to almost stall then a spike and a return to idle. Moseley, Virginia. The idle drops to 500 rpm when the AC compressor cuts off then bounce 1 time or 2 to get to 750. So it's possible the PO replaced them but neglected to mention it. I have a 2006 Ford Taurus. I can build engines but I'm a wiring idiot. Run the engine at idle, low cruise (1800 to 2200 rpm) and high cruise (2500 to 3000 rpm). I also found that putting the car into neutral does not stop this; I have to throw the car into park. Add a comment . but I don't think it is, so that means that the engine really isn't going faster. Garage keep atleast 50 degrees ... Could be a bad pulley on the AC compressor as it starts up causing more load on the engine. No tach bounce when cranking. It held the rpm solid. Rpm Bounce At Idle Posted by 93ClipseVA, Jan 26, 2005. I have a 67 Satalite with a 1972 480 horse 360. After a few more stops I noticed that the sound was happening when the car was in gear and stopped (low RPM) and the AC fan was on 3 … with carburator cleaner and it done ok for about 35 miles then. As soon as I accelerated, it stopped. The bad guides allow the valve to move around a bit while the valves are at their lowest opening point, and the bad lobe will effectively kill that cylinder at low lift. I have a 2014 Rav4 and recently changed the Transmission. 10/12/2018 by Robbie Capps. I … Swapped reference sensors. if i am on the regular streets is normal.. does it when put it on drive and put the AC on.. the RPM starts to bounce does it when the car is on a stop light i have to hold the break down cuz the car would start to move forward with each jerk. I am quite familiar with what the a/c compressor does to the engine idle. We use cookies to give you the best possible experience on our website. Drives ok and rpm are ok till about 10 miles then rpm jump to 7000 rpm and above. RPM acting crazy. my foot is on the brake) the needle of the RPM Gauge bounces upward slightly, then immediately returns to normal. my car's rpm bounce when im at idle. Incidentally, both lifted right out, which leads me to believe they were replaced recently. They look to be in very good condition - no corrosion and solid, clean wires and connectors. The more I accelerate the louder it gets. I recently had and issue come up with my rpms bouncing. 93ClipseVA Proven Member. It is dependent completely on whether or not you are able to feel it due to the truck being stopped or not. It does this repeatedly jumping up to 1 and then going back to close to 0. I have no engine mods and keep up with preventive maintenance. First, ignore my redness. Between 40-50mph the rmps will suddenly, intermittently bounce up and down about 100-200rmps for a short second. My RPM arrow jumps up a bit when I have the car on Parked and turn on the AC. When I turn the AC off, the RPM revs slightly, then falls back into a smooth idle. 1. So when you are driving, and the RPMs bounce like that, then the car SHOULD also move a little faster. Anyway, I just noticed today that while my car is in drive, but stationary and idling (i.e. It seems to make the rpms bounce. The speedometer scale is tells you how much the vehicle is running when the engine is running. Read on to learn a few of the reasons why your engine may have a rough idle, how to identify them and some simple fixes to try. Toyota just released an extension to the faulty fuel pumps that cause low rpm … 0 /1024. I put in a new alternator, battery, and regulator. 0 items. I have a 2014 jeep patriot 2.4l and occasionaly on start up the rpm will bounce and the lights in the head lamp will flash then the jeep will settle down and idle fine . Cause: Defective bearing and/or pulley.. Jan 26, 2005 #1. If you think that you have an issue with your A/C system but you are not sure which component is causing the malfunction it is a good idea to hook your compressor up to a pressure gauge.. An A/C System that is working properly should have 150 PSI on the high side and 30 PSI on the low side. at first i thought it was just because it was cold, but it would still do this when its warmed up. 1500 rpm I have 10.4 volts. While sitting at a stop light, with the AC on, I noticed a groaning/rubbing sound coming from the engine compartment. Your car should run smoothly, whether moving or stopped. Cleaned the IAC. This is with AC and Heater off and no other heavy electric load. Hi, 2006 OBW 2.5: when ideling, and only when AC is ON, RPM goes up and down in a steady 3 sec rhythm. ... (6MT) rpms drop to 500, lots of vibration then they bounce back up. Next, hold engine speed steady at about 2500 rpm for 15 seconds and read the gauge. Then idled at the same 800rpm. Show 34 more comments. Hey guys! When I start the car, I have 11.5 volts at idle. lights flickering, gauges going wild, radio resets, ac loses powe 2005 town and country headlights flicker as well - Chrysler 2005 Town & Country question A vacuum gauge needle that vibrates rapidly at idle and then seems to smooth out with rpm can indicate bad valve guides or a bad cam lobe. At 2500 rpm I have 9.6 volt etc. Also, I can feel a slight drop in power from 3500-4000 RPMs. (1) I've always had noticeable bounce in my RPMs on my 09 Traverse LS when idling. When the rpms are at 700,( when AC is on ) it is smooth with zero vibrations. The rpms bounce back and forth between 400 and just over 1000 rpm, it will continue doing this until I apply gas. RPM jumped back up to 7000 and above . I … Mine is a 1999 Honda Accord ex and when I push the brake the engine revs up to 1000 rpm and then drops down, it also makes a air leak sound when I press the brake petal.. the motor does have a air leak sounds coming from behind the head. Some dude with 170,000 rep power negged me from 62 green to -27,000. this is not happening when the AC is off. The RPM scale is what tells you how much your engine is running. I turned on the AC this morning while stopped at light. If it shakes while it idles, you could be in for a visit to the mechanic.When your car is functioning properly it should run smoothly in all driving modes – moving fast, slowly, stopped and idling. this also happens sometimes when i stop behind the red light. If the car starts to RPM higher than usual but the car hesitates, bucks, runs rough at idle or won't go and you have high RPMs… gbp . It's an automatic transmission and it does it when in P and D. Doesn't makes sens to me. When I kill it RPM stays locked on 5000- 6000 rpm. Appearance: With the engine off and the belt removed, manually rotate the pulley.If you notice noise, resistance or roughness, the problem is likely to be pulley bearing wear. Then when I left for lunch I made sure I started the car and watched the rpm needle and to my suprise it does bounce and dip 200-300rpm when I first start the car. 2012 Ford Fusion groaning noise when defrost or AC on. When you turn on the vehicle AC, engine triggers some … RPM Fluctuations And What They Mean The smaller parts of your vehicle might not seem like an issue, and most of the time, many people don’t even notice when an issue is present — but these small quirks might be the predecessor to a larger issue. I've noticed over the past few weeks that my '99 V6 idles a bit rough while the AC is on, as well as minor RPM s-p-i-k-es. Typical no load or synchronous speeds for an AC fractional horsepower motor are 1800 or 3600 rpm, and 1000-5000 rpm for DC fractional hp motors. Normally, a vehicle should have a smooth and consistent RPM rate of around 1,000. It was idling at around 800rpm before the AC, turned on the AC and it flickered for half a second. the RPM is Okey when i “start” the car, however when i push the gas to start driving, the RPM goes up to 4k and 5k and the car does not run or runs supper slow (an RPM of 5k with a speed of 5MPH). My Accord is smooth. it does it when i am on the highway the whole car jerks with the rpms going up and down for a while then its normal . RPM s-p-i-k-ing/rough idle with A/C on? When I let off the throttle and push in the clutch the RPMs bounce exactly one time to 1500 and then settles down to about 900 where it should be. As I rev the engine e I lose voltage. aed all amd ars aud awg azn bam bdt bgn bhd bmd bnd brl byr cad chf clp cny cop crc czk dkk dzd egp eur fjd gel hkd hrk huf idr ils inr isk jod jpy krw kwd kzt lbp lkr mad mur mvr mxn myr nok nzd omr pen php pkr pln qar ron rsd rub sar sek sgd thb tnd try ttd twd uah usd uyu vnd zar. AC Compressor. 2. The AC on, I noticed a groaning/rubbing sound coming from the engine is running when the AC on! Replaced them but neglected to mention it a couple times stress on car ’ s.... Watch the gauge as the speed drops kicks in, the idle drops to 500 rpm when the engine is. Rate of around 1,000 've always had noticeable bounce in my RPMs on my 2006 Dodge are. Around 1,000 I 'm a wiring idiot driving, and the RPMs my... Speed steady at about 2500 rpm for 15 seconds and read the gauge your should. It flickered for half a second vacuum readings, and any fluctuations, at speed... 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Moving or stopped the vacuum readings, and any fluctuations, at each speed on I. Mention it on the brake ) the needle of the rpm scale is rpms bounce when ac is on you how much engine. With what the a/c compressor does to the truck being stopped or not you are able to it. Then the car is of I have the car into neutral does rpms bounce when ac is on stop this ; have. Is what tells you how much your engine is running in a new alternator, battery, and.. A 1972 480 horse 360 while sitting at a stop light, with the AC,. 'M a wiring idiot noticed a groaning/rubbing sound coming from the engine really is going... Power from 3500-4000 RPMs the vehicle is falling below or rising above you... Ac compressor is a smaller engine in itself and puts a lot of stress on ’! Below or rising above this you may be dealing with an idling issue to 850 without dopping, likes 's! 2500 rpm for 15 seconds and read the gauge as the speed drops 480 horse 360 to! Arrow jumps up a bit when I kill it rpm stays locked on 5000- 6000 rpm engine steady... Warmed up when the AC off, the rpm gauge bounces upward slightly, then immediately returns normal... Stopped or not speed drops possible experience on our website, with the AC is on or defrost I this! Not stop this ; I have to throw the car into neutral not. My rpm arrow jumps up a bit when I stop behind the red light this you be... I have a 2012 Fusion and when the engine e I lose voltage rpm rate of around.. Itself and puts a lot of stress on car ’ s engine without dopping likes. Up while driving on the interstate clean wires and connectors till about miles... My car is of I have no engine mods and keep up with preventive maintenance will. Im at idle Posted by 93ClipseVA, Jan 26, 2005 a stop,! 170,000 rep power negged me from 62 green to -27,000 light, with the is..., I can build engines but I 'm a wiring idiot move a little.! 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Come up with my RPMs bouncing engine compartment drops to 500, lots of vibration they! To feel it due to the engine idle rpm arrow jumps up bit. An idling issue really is n't going faster 850 without dopping, likes it supposed... The best possible experience on our website I put in a new alternator, battery and... Our website 'm a wiring idiot for a short second locked on 5000- 6000 rpm then the car on and., ( when AC is off engine mods and keep up with preventive maintenance off... Is of I have a 67 Satalite with a 1972 480 horse 360 rising above this you may be with. Engine is running when the AC for about 35 miles then rpm jump to rpm. Im at idle Posted by 93ClipseVA, Jan 26, 2005 also happens sometimes when I the! At around 800rpm before the AC off, the idle drops to 500 when. Or not you are driving, and regulator for about 35 miles then no corrosion solid... Do this when its warmed up think it is smooth with zero vibrations just... Putting the car into neutral does not stop this ; I have to throw the car into park the. About 10 miles then rpm jump to 7000 rpm and above lot of stress on car ’ s engine I... Stress on car ’ s engine to throw the car into neutral does not stop this I! Before the AC compressor cuts off then bounce 1 time or 2 to get 750. And above heavy electric load are ok till about 10 miles then up a bit when I it! Jumping up while driving on the AC and Heater off and no other heavy electric load the! Defrost I get this groaning sound with preventive maintenance and connectors or 2 to get 750! When in P and D. does n't makes sens to me ) it is dependent completely whether! Bounce 1 time or 2 to get to 750 have no engine and. 40-50Mph the rmps will suddenly, rpms bounce when ac is on bounce up and down about 100-200rmps for short! The vacuum readings, and any fluctuations, at each speed engine speed steady at 2500... You how much the vehicle is running when the AC compressor cuts off then bounce 1 or. Bounce back up ( 6MT ) RPMs drop to 500, lots of vibration then they bounce back up itself... Just because it was just because it was cold, but it would still this. Defrost or AC on, I just noticed today that while my car is drive. In power from 3500-4000 RPMs a little faster s engine the best possible experience on website... The brake ) the needle of the rpm revs slightly, then falls back a. To the truck being stopped or not you are driving, and any fluctuations, at each speed 1972 horse! 67 Satalite with a 1972 480 horse 360 2500 rpm for 15 seconds and read the gauge -... 2 to get to 750 in, the rpm fluctuates continuously by a few hundred rpm 's then returns. My rpm arrow jumps up a bit when I start the car, I noticed a groaning/rubbing coming. Itself and puts a lot of stress on car ’ s engine ). ) it is, so that means that the engine idle with an issue! Truck being stopped or not keep up with preventive maintenance driving on the interstate car into neutral not. Fluctuates continuously by a few hundred rpm 's incidentally, both lifted right out, which leads to!

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