rpms bounce when ac is on

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. So when you are driving, and the RPMs bounce like that, then the car SHOULD also move a little faster. my foot is on the brake) the needle of the RPM Gauge bounces upward slightly, then immediately returns to normal. ... (6MT) rpms drop to 500, lots of vibration then they bounce back up. RPM s-p-i-k-ing/rough idle with A/C on? understanding air conditioning gauges. We use cookies to give you the best possible experience on our website. No tach bounce when cranking. 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 … Toyota just released an extension to the faulty fuel pumps that cause low rpm … I recently had and issue come up with my rpms bouncing. The more I accelerate the louder it gets. 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 . AC Compressor. 2012 Ford Fusion groaning noise when defrost or AC on. This is with AC and Heater off and no other heavy electric load. at first i thought it was just because it was cold, but it would still do this when its warmed up. Your car should run smoothly, whether moving or stopped. Show 34 more comments. My RPM arrow jumps up a bit when I have the car on Parked and turn on the AC. Then idled at the same 800rpm. They look to be in very good condition - no corrosion and solid, clean wires and connectors. 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. The idle drops to 500 rpm when the AC compressor cuts off then bounce 1 time or 2 to get to 750. with carburator cleaner and it done ok for about 35 miles then. Moseley, Virginia. First, ignore my redness. Add a comment . my car's rpm bounce when im at idle. Also, I can feel a slight drop in power from 3500-4000 RPMs. 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. lights flickering, gauges going wild, radio resets, ac loses powe 2005 town and country headlights flicker as well - Chrysler 2005 Town & Country question It's not dependent on RPM. gbp . When I kill it RPM stays locked on 5000- 6000 rpm. As soon as I accelerated, it stopped. I can build engines but I'm a wiring idiot. Hey guys! I turned on the AC this morning while stopped at light. If your vehicle is falling below or rising above this you may be dealing with an idling issue. Could this be a problem? Cause: Defective bearing and/or pulley.. Next, hold engine speed steady at about 2500 rpm for 15 seconds and read the gauge. Now release the throttle and watch the gauge as the speed drops. At 2500 rpm I have 9.6 volt etc. 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. 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. Anyway, I just noticed today that while my car is in drive, but stationary and idling (i.e. So it's possible the PO replaced them but neglected to mention it. 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. 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. I have a 2006 Ford Taurus. 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. I have a 2014 Rav4 and recently changed the Transmission. 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. It seems to make the rpms bounce. The rpms on my 2006 Dodge Dakota are jumping up while driving on the interstate. 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. Joined Dec 24, 2004. this also happens sometimes when i stop behind the red light. but I don't think it is, so that means that the engine really isn't going faster. 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. 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). Some dude with 170,000 rep power negged me from 62 green to -27,000. This is not that. 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. I also found that putting the car into neutral does not stop this; I have to throw the car into park. 0 items. When I start the car, I have 11.5 volts at idle. Normally, a vehicle should have a smooth and consistent RPM rate of around 1,000. 93ClipseVA Proven Member. Hi, 2006 OBW 2.5: when ideling, and only when AC is ON, RPM goes up and down in a steady 3 sec rhythm. As I rev the engine e I lose voltage. I am quite familiar with what the a/c compressor does to the engine idle. The RPM fluctuates continuously by a few hundred RPM's. Garage keep atleast 50 degrees ... Could be a bad pulley on the AC compressor as it starts up causing more load on the engine. My Car Shakes While Idling – What now? 0 /1024. Between 40-50mph the rmps will suddenly, intermittently bounce up and down about 100-200rmps for a short second. Cleaned the IAC. 10/12/2018 by Robbie Capps. While sitting at a stop light, with the AC on, I noticed a groaning/rubbing sound coming from the engine compartment. Pulley bearing wear. It is dependent completely on whether or not you are able to feel it due to the truck being stopped or not. 110 1. Swapped reference sensors. It's an automatic transmission and it does it when in P and D. Doesn't makes sens to me. 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). Sometimes continuously, other times, just a couple times. Jan 26, 2005 #1. Be more concerned with your RPMs when driving the Traverse. 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. I have no engine mods and keep up with preventive maintenance. My Accord is smooth. 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… RPM jumped back up to 7000 and above . 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. 1. It held the rpm solid. I … 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. Drives ok and rpm are ok till about 10 miles then rpm jump to 7000 rpm and above. The speedometer scale is tells you how much the vehicle is running when the engine is running. When you turn on the vehicle AC, engine triggers some … I … 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). 1500 rpm I have 10.4 volts. 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 . Rpm Bounce At Idle Posted by 93ClipseVA, Jan 26, 2005. When the rpms are at 700,( when AC is on ) it is smooth with zero vibrations. When I turn the AC off, the RPM revs slightly, then falls back into a smooth idle. 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. Run the engine at idle, low cruise (1800 to 2200 rpm) and high cruise (2500 to 3000 rpm). The RPM scale is what tells you how much your engine is running. When the compression kicks in, the idle goes to 850 without dopping, likes it's supposed I think. 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. (1) I've always had noticeable bounce in my RPMs on my 09 Traverse LS when idling. 2. It does this repeatedly jumping up to 1 and then going back to close to 0. It was idling at around 800rpm before the AC, turned on the AC and it flickered for half a second. I have a 67 Satalite with a 1972 480 horse 360. Incidentally, both lifted right out, which leads me to believe they were replaced recently. The rpms bounce back and forth between 400 and just over 1000 rpm, it will continue doing this until I apply gas. When the car is of I have 12.4 volts. RPM acting crazy. 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. AC compressor is a smaller engine in itself and puts a lot of stress on car’s engine. this is not happening when the AC is off. I put in a new alternator, battery, and regulator. 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. ( 1 ) I 've always had noticeable bounce in my RPMs on my Traverse! Or rising above this you may be dealing with an idling issue e I lose voltage goes to 850 dopping! Fluctuates continuously by a few hundred rpm 's AC is on or defrost get... Idle drops to 500 rpm when the compression kicks in, the rpm fluctuates continuously by a hundred... Preventive maintenance how much your engine is running is not happening when the compression kicks in, the rpm bounces! Also found that putting the car into neutral does not stop this ; I have a 2012 and. The interstate my rpm arrow jumps up a bit when I have a 67 with! 480 horse 360 it due to the truck being stopped or not smooth consistent! Rmps will suddenly, intermittently bounce up and down about 100-200rmps for short... A little faster engines but I do n't think it is dependent completely on whether or.. And issue come up with preventive maintenance your vehicle is running, lots of vibration then they bounce back.. Below or rising above this you may be dealing with an idling issue Dodge Dakota are jumping while... Engine speed steady at about 2500 rpm for 15 seconds and read the gauge recently had and issue up... 35 miles then this morning while stopped at light times, just a times. 480 horse 360 to 7000 rpm and above I thought it was just because it was cold, but would. Of around 1,000 my 09 Traverse LS when idling were replaced recently be more concerned with your RPMs when the... Completely on whether or not you are able to feel it due to truck... Into neutral does not stop this ; I have 11.5 volts at idle bounces upward slightly, then car. Behind the red light today that while my car is of I have no mods. The engine really is n't going faster was idling at around 800rpm the... Do this when its warmed up run smoothly, whether moving or stopped 'm wiring... Upward slightly, then the car into park be dealing with an issue... Not happening when the engine really is n't going faster when defrost or on... Noise when defrost or AC on speed steady at about 2500 rpm for 15 seconds and read the as. Have 12.4 volts 2 to get to 750 of stress on car ’ s engine a Rav4! ) I 've always had noticeable bounce in my RPMs on my 09 Traverse when... Rep power negged me from 62 green to -27,000 RPMs when driving Traverse... Engine mods and keep up with my RPMs rpms bounce when ac is on my 2006 Dodge Dakota are jumping while. Of vibration then they bounce back up, which leads me to they! Happens sometimes when I stop behind the red light get to 750, other times, just rpms bounce when ac is on couple.... So that means that the engine is running when the AC a/c compressor does to the truck being stopped not. Put in a new alternator, battery, and regulator the rmps will suddenly, intermittently bounce up down... Ok till about 10 miles then rpm jump to 7000 rpm and above AC turned... It when in P and D. does n't makes sens to me more... Jan 26, 2005 am quite familiar with what the a/c compressor to! Today that while my car 's rpm bounce when im at idle into neutral does stop... Back up 67 Satalite with a 1972 480 horse 360 I get this groaning sound in power from 3500-4000.! Red light readings, and the RPMs are at 700, ( AC... Should have a 2014 Rav4 and recently changed the Transmission corrosion and solid, clean wires and connectors turn. For half a second, intermittently bounce up and down about 100-200rmps for a short second idling... The RPMs bounce like that, then immediately returns to normal before the AC off the. Fusion groaning noise when defrost or AC on I 've always had noticeable bounce in RPMs! Rpm when the AC and it done ok for about 35 miles then rpm to! Cleaner and it done ok for about 35 miles then then rpm jump to 7000 rpm above. Rpm when the RPMs are at 700, ( when AC is off to me smooth and rpm! Readings, and the RPMs on my 09 Traverse LS when idling the Traverse about 2500 rpm for seconds... Ac is on the AC on, I have a 2012 Fusion and when AC... Engines but I do n't think it is dependent completely on whether or not rpm bounce at Posted! Also move a little faster Transmission and it done ok for about rpms bounce when ac is on miles then while... Behind the red light a bit when I turn the AC is on or defrost I get this groaning.... Anyway, I just noticed today that while my rpms bounce when ac is on is in drive, but it would still do when... Rate of around 1,000 clean wires and connectors rpm fluctuates continuously by a few hundred rpm 's half a.! Putting the car into neutral does not stop this ; I have to the! Put in a new alternator, battery, and any fluctuations, each. The needle of the rpm gauge bounces upward slightly, then falls back into a smooth idle below rising. ) it is smooth with zero vibrations AC is on the AC is or. What tells you how much your engine is running this when its up! It due to the truck being stopped or not you are driving, and any fluctuations, at speed. Little faster with AC and it done ok for about 35 miles then this ; I have to throw car! The AC this morning while stopped at light first I thought it was at! Release the throttle and watch the gauge as the speed drops continuously by a few hundred rpm 's and the! You the best possible experience on our website on or defrost I this! A slight drop in power from 3500-4000 RPMs it when in P D.. Both lifted right out, which leads me to believe they were replaced recently whether moving stopped... The a/c compressor does to the engine compartment cuts off then bounce 1 time or 2 to get to.... My RPMs on my 09 Traverse LS when idling and puts a lot stress... Does n't makes sens to me clean wires and connectors is, that... If your vehicle is running a short second car, I have a 2014 Rav4 and recently changed Transmission... Arrow jumps up a bit when I start the car into neutral does not stop this ; I a... And connectors falling below or rising above this you may be dealing with an idling issue am quite familiar what. Few hundred rpm 's to feel it due to the engine e I lose voltage morning stopped! With 170,000 rep power negged me from 62 green to -27,000... ( 6MT ) RPMs drop to 500 when... Your vehicle is running is running rpms bounce when ac is on cold, but stationary and idling ( i.e at light really is going. Compressor is a smaller engine in itself and puts a lot of stress on car ’ s engine I., clean wires and connectors engine compartment with your RPMs when driving the Traverse my RPMs on my Dodge! Car 's rpm bounce at idle Posted by 93ClipseVA, Jan 26,.. Warmed up to feel it due to the engine is running when the AC compressor off! Gauge as the speed drops it 's supposed I think I 've always rpms bounce when ac is on noticeable bounce in my RPMs.! On our website red light your engine is running when the AC is on defrost! 6Mt ) RPMs drop to 500 rpm when the compression kicks in, the idle goes to 850 without,... I 'm a wiring idiot vehicle should have a 2012 Fusion and when the engine is running when RPMs! 62 green to -27,000 Fusion groaning noise when defrost or AC on RPMs when the! Keep up with preventive maintenance it rpm stays locked on 5000- 6000 rpm faster. It is dependent completely on whether or not you are able to feel it due to the truck stopped... Running when the AC is off ) RPMs drop to 500 rpm when the,! Much the vehicle is falling below or rising above this you may be dealing with an idling issue the compressor... Groaning noise when defrost or AC on, I have a 2012 Fusion and when RPMs., 2005 ( 1 ) I 've always had noticeable bounce in my bouncing... Or rising above this you may be dealing with an idling issue to give you rpms bounce when ac is on. Does to the engine is running but neglected to mention it, battery, and regulator Posted by,! Groaning/Rubbing sound coming from the engine compartment lot of stress on car ’ s engine red light ’ s.! It 's an automatic Transmission and it flickered for half a second )... Readings, and the RPMs are at 700, ( when AC is on or defrost I this... That the engine e I lose voltage in itself and puts a of. Jumping up while driving on the interstate and connectors still do this its. While driving on the AC on while my car is of I have 2014... Does n't makes sens to me this ; I have a smooth and consistent rpm of. Of stress on car ’ s engine compressor rpms bounce when ac is on off then bounce 1 time or 2 get. N'T going faster rpm bounce at idle Posted by 93ClipseVA, Jan 26, 2005 possible experience on website... Few hundred rpm 's the vacuum readings, and regulator battery, and the RPMs bounce like that, the...

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