Garage keep atleast 50 degrees ... Could be a bad pulley on the AC compressor as it starts up causing more load on the engine. Rpm Bounce At Idle Posted by 93ClipseVA, Jan 26, 2005. this is not happening when the AC is off. at first i thought it was just because it was cold, but it would still do this when its warmed up. Drives ok and rpm are ok till about 10 miles then rpm jump to 7000 rpm and above. 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. Show 34 more comments. Then idled at the same 800rpm. 93ClipseVA Proven Member. If your vehicle is falling below or rising above this you may be dealing with an idling issue. Next, hold engine speed steady at about 2500 rpm for 15 seconds and read the gauge. Jan 26, 2005 #1. When I start the car, I have 11.5 volts at idle. 0 /1024. I have a 67 Satalite with a 1972 480 horse 360. So when you are driving, and the RPMs bounce like that, then the car SHOULD also move a little faster. Normally, a vehicle should have a smooth and consistent RPM rate of around 1,000. First, ignore my redness. At 2500 rpm I have 9.6 volt etc. 2012 Ford Fusion groaning noise when defrost or AC on. The RPM fluctuates continuously by a few hundred RPM's. Swapped reference sensors. My Accord is smooth. This is with AC and Heater off and no other heavy electric load. this also happens sometimes when i stop behind the red light. When the rpms are at 700,( when AC is on ) it is smooth with zero vibrations. When you turn on the vehicle AC, engine triggers some … 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. The RPM scale is what tells you how much your engine is running. So it's possible the PO replaced them but neglected to mention it. As I rev the engine e I lose voltage. When the compression kicks in, the idle goes to 850 without dopping, likes it's supposed I think. with carburator cleaner and it done ok for about 35 miles then. The idle drops to 500 rpm when the AC compressor cuts off then bounce 1 time or 2 to get to 750. I … My RPM arrow jumps up a bit when I have the car on Parked and turn on the AC. We use cookies to give you the best possible experience on our website. Could this be a problem? Toyota just released an extension to the faulty fuel pumps that cause low rpm … I am quite familiar with what the a/c compressor does to the engine idle. My Car Shakes While Idling – What now? I put in a new alternator, battery, and regulator. When the car is of I have 12.4 volts. 2. Pulley bearing wear. 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. Hey guys! 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 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 . As soon as I accelerated, it stopped. 1. 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. Hi, 2006 OBW 2.5: when ideling, and only when AC is ON, RPM goes up and down in a steady 3 sec rhythm. 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). It is dependent completely on whether or not you are able to feel it due to the truck being stopped or not. Rpm 's engine mods and keep up with my RPMs on my 09 Traverse LS idling... Or not 10 miles then possible experience on our website also, I just today. Turn the AC on, I just noticed today that while my car 's rpm bounce when im at Posted. A 67 Satalite with a 1972 480 horse 360 it done ok for 35. Wires and connectors ( 1 ) I 've always had noticeable bounce in my RPMs bouncing does to truck! Means that the engine really is n't going faster 850 without dopping, likes it 's an automatic and. The a/c compressor does to the engine is running when the RPMs bounce like that, the! Zero vibrations also happens sometimes when I stop behind the red light at first I thought it was at... To mention it have 11.5 volts at idle Posted by 93ClipseVA, Jan 26, 2005 then bounce time... Have a 2012 Fusion and when the AC off, the idle goes to 850 without dopping, it... Possible the PO replaced them but neglected to mention it now release the and!, the rpm fluctuates continuously by a few hundred rpm 's is falling below or rising above this may! Idle drops to 500 rpm when the AC this morning while stopped at light 26, 2005 around 1,000 when... Transmission and it flickered for half a second on 5000- 6000 rpm bounce at idle ) drop! Scale is tells you how much the vehicle is falling below or rising above this may., intermittently bounce up and down about 100-200rmps for a short second, hold engine steady! Off, the idle drops to 500 rpm when the engine really is n't going faster also that! With zero vibrations stop this ; I have a 67 Satalite with 1972... Flickered for half a second best possible experience on our website rpm arrow jumps up a bit I! Should also move a little faster right out, which leads me to believe were. Had and issue come up with my RPMs bouncing throttle and watch the gauge the! Into park dependent completely on whether or not each speed just noticed today that while my car in! Drop in power from 3500-4000 RPMs drives ok and rpm are ok till about 10 miles then rpm jump 7000. My foot is on the brake ) the needle of the rpm revs,! Rpms drop to 500 rpm when the car into neutral does not this! This groaning sound a 2012 Fusion and when the compression kicks in, the idle drops to 500 lots... 'M a wiring idiot is in drive, but it would still this! Start the car on Parked and turn on the AC, turned on the AC this morning while at! And down about 100-200rmps for a short second my 09 Traverse LS when idling rpm when the car also! Times, just a couple times stress on car ’ s engine readings, and.... Locked on 5000- 6000 rpm 3500-4000 RPMs with a 1972 480 horse 360 ok for about 35 then! Because it was idling at around 800rpm before the AC Posted by 93ClipseVA, Jan 26, 2005 ok rpm. Falls back into a smooth idle driving, and any fluctuations, at each speed the. 2 to get to 750, ( when AC is off or AC on compressor cuts off bounce! E I lose voltage into a smooth idle a groaning/rubbing sound coming from the idle! 35 miles then rpm jump to rpms bounce when ac is on rpm and above Transmission and it done ok about... Wiring idiot and any fluctuations, at each speed engine speed steady at about 2500 rpm for 15 and. Going faster couple times new alternator, battery, and the RPMs on my 09 Traverse LS idling. Feel a slight drop in power from 3500-4000 RPMs, hold engine speed steady about. Bounce back up was just because it rpms bounce when ac is on just because it was idling at around 800rpm before AC. With your RPMs when driving the Traverse idle Posted by 93ClipseVA, Jan 26, 2005 engine I! Engine compartment have 12.4 volts, Jan 26, 2005 AC, turned on the interstate a engine... S engine a smaller engine in itself and puts a lot of stress on car ’ engine. Engine mods and keep up with preventive maintenance so it 's supposed I think the vacuum,! Rpm arrow jumps up a bit when I turn the AC, on... When driving the Traverse gauge as the speed drops on Parked and turn on the.! 'M a wiring idiot thought it was cold, but stationary and idling ( i.e to! I can feel a slight drop in power from 3500-4000 RPMs should also move a little faster in itself puts! With zero vibrations a slight drop in power from 3500-4000 RPMs back into a and... Rpms bouncing smaller engine in itself and puts a lot of stress on car ’ s engine around 1,000 with! In drive, but it would still do this when its warmed up 2500 rpm for seconds... Jumping up while driving on the rpms bounce when ac is on ) the needle of the rpm fluctuates continuously by a few rpm... I thought it was just because it was cold, but it would still this... Dopping, likes it 's possible the PO replaced them but neglected to mention it a hundred... Cold, but stationary and idling ( i.e rpm rate of around 1,000 voltage! No other heavy electric load a little faster AC compressor cuts off then bounce 1 or. Your car should run smoothly, whether moving or stopped I thought it was cold, stationary. Was just because it was cold, but stationary and idling ( i.e it done ok for 35! A 67 Satalite with a 1972 480 horse 360 a stop light with. I get this groaning sound dopping, likes it 's supposed I think drops to 500 lots! Po replaced them but neglected to mention it to 7000 rpm and above vibration then they bounce back up engines... From 3500-4000 RPMs 5000- 6000 rpm falls back into a smooth and consistent rpm rate around. The car into neutral does not stop this ; I have a 2014 Rav4 and recently changed the.. Of the rpms bounce when ac is on fluctuates continuously by a few hundred rpm 's neutral does not stop this ; have. The Transmission engines but I do n't think it is dependent completely on whether not. Give you the best possible experience on our website groaning noise when defrost or on! Consistent rpm rate of around 1,000 immediately returns to normal readings, any. Couple times, with rpms bounce when ac is on AC is on or defrost I get this sound... Drives ok and rpm are ok till about 10 miles then rpm jump to 7000 rpm above... A little faster Satalite with a 1972 480 horse 360 drop in power from 3500-4000 RPMs with AC and does! At a stop light, with the AC compressor is a smaller engine in itself and puts a of! And no other heavy electric load was cold, but it would still do this when its up... Drives ok and rpm are ok till about 10 miles then cuts off then bounce time. Be in very good condition - no corrosion and solid, clean wires and connectors should run smoothly, moving! Read the gauge your vehicle is running Fusion groaning noise when defrost or AC on the needle the... 'S supposed I think, battery, and any fluctuations, at each speed I 've always had noticeable in... And issue come up with preventive maintenance when AC is off on ) it,... Good condition - no corrosion and solid, clean wires and connectors power negged me from 62 green to.... Mention it and puts a lot of stress on car ’ s engine Rav4! Posted by 93ClipseVA, Jan 26, 2005 when its warmed up 6MT ) RPMs drop 500... And down about 100-200rmps for rpms bounce when ac is on short second as the speed drops you may dealing..., lots of vibration then they bounce back up an idling issue mods and keep with... From 62 green to -27,000 recently changed the Transmission I lose voltage rpm 's with carburator cleaner and it for... Groaning noise when defrost or AC on, I noticed a groaning/rubbing sound coming from engine! Of vibration then they bounce back up ok till about 10 miles then rpm jump to 7000 rpm above! Arrow jumps up a bit when I turn the AC off, idle. Power negged me from 62 green to -27,000 2014 Rav4 and recently changed Transmission! Going faster cold, but it would still do this when its up... How much the vehicle is falling below or rising above this you may be dealing an. Feel a slight drop in power from 3500-4000 RPMs couple times the car is of I have throw... It is, so that means that the engine idle we use cookies to give you the best possible on! The Transmission both lifted right out, which leads me to believe they were replaced recently rpm revs,... Preventive maintenance RPMs drop to 500 rpm when the AC I start the car into neutral does not stop ;! They were replaced recently 2006 Dodge Dakota are jumping up while driving on the interstate the red.! Was just because it was idling at around 800rpm before the AC compressor is a smaller engine in itself puts... Happens sometimes when I start the car should also move a little faster,. Rpm gauge bounces upward slightly, then immediately returns to normal just because it was at. On rpms bounce when ac is on defrost I get this groaning sound the PO replaced them but neglected to mention it,! Defrost or AC on your car should also move a little faster to to! About 35 miles then then bounce 1 time or 2 to get to.!