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Automotive Repair Car Troubleshooting Topics   Car Troubleshooting   Engine Troubleshooting   Engine Fault Codes   Electrical and Wiring   Transmission Problems Car Repair Topics   Car Making Noises   Car Stereo Repair   Heating or AC Issues   Motorcycles and ATVs   Tricks of the Trade   Truck Repair Advice Site Options:      Login   Sign up here! Latest Forum Post   ((BRAZIL)) SSD CHEMICAL SOLUTION UK+27672716140 ((BRAZIL)) SSD CHEMICAL SOLUTION UK+2767...   2011 Dodge Nitro OBD scanner seems to drain battery in 10-20 minutes When I bought this car in summer 2023, a... Grounding Cable, 2017 Jeep Renegade Trailhawk The Cable that connects my negative batt... Rough Idle (Found new thing) Hi everyone. First of all sorry for bad ...     equipment hey yall. im a first year engineering st...   HELP I have a 1956 1/2 ton panel truck, 69 35...   Howdy     Just wanted to s...   ABS/Tractiob/Brake Lights on But No DTCs Hello all, Recently while driving m...   Chevy strut replacement I'm trying to get a sensor of some kind ...   2020 suburban new transmission and issues after install recently had the transmission fail at 11...

Search Auto Parts Search Pulsing idle and dimming lights Sign up here!   Email This Post Auto Repair Home>> Automotive Repair>> Car Troubleshooting r-raid New User Aug 19, 2010, 4:49 PM Post #1 of 3 (3426 views) Pulsing idle and dimming lights Sign In Hey, So I got my car, (Subaru Impreza 2000 RS 2.5) and its has a pulsing Idle. I start my car cold, idles around 500 rpms (the normal) then once the car is warm, its starts to pulse. Always goes lower in rpms then corrects itself back to 500. But in the correction it never fully corrects itself so its always decreasing. Then the car dies. Only at stops. the car runs fine when driving. Except acceleration is rough. If I turn on my A/C, it almost keep the car alive. Only when the A/C is increasing the idle does the pulsing go away and no stall occurs. When the A/C is turned off the pulsing come back. On the low end of the pulse the dash lights dim. I have checked the alternator and the test was positive. Reading around 14.3. I also had replaced the fuel injectors. Cleaned the o2 sensors and IAC valve. Checked the grounds. The wires plugs and coil pack are fairly new 10,000 miles. I have also cleaned the throttle body opening and my cars MAP sensor. Can you please help me Sidom Veteran / Moderator Aug 19, 2010, 10:36 PM Post #2 of 3 (3422 views) Re: Pulsing idle and dimming lights Sign In You should start out with checking out the Idle air control valve and related parts. It's possible you have a dirty throttle body or possibly a bad valve.. Pretty much all fuel injected cars will default to a cold start position when shut off. What this means is when you start the car the rpms should go high, around 1000. If the car is actually cold the rpms will stay high for as long as that particular cold start strategy calls for. If it is already warm the rpms will come down quickly to the normal range but will always start high even if for just a second or 2. If when your start you car it is only going up to 500 rpms when it's started, something is wrong there and needs to be addressed.... I just reread your post & see where you've done some of this. Unfortunately after you do some of these basics and it doesn't work, then you need some more complex tools to check out the system.... The only other thought I have is to make sure you don't have any vacuum leaks. Check the hoses & spray some carb clean around the intake manifold. Any raise in rpm would indicate a leak.... Other than that it gets a little tougher to nail down.... Hope this helps a bit.... r-raid New User Aug 23, 2010, 4:12 PM Post #3 of 3 (3407 views) Re: Pulsing idle and dimming lights Sign In so i tested the iac valve and thats fine. drove the car too the grocery store and the cel came on. misfire on 1 2 3 4. The coilpack is new so i checked the wires and plugs and they have oil all over them. coming out of the spark plug holes. same problems previously stated still exist anyone?   Email This Post   Automotive Repair     Auto Body Repair and Refinishing     Heating or AC Issues     Electrical and Wiring     Brake Systems     Car Stereo Repair Advice     General Discussions     Car Making Funny Noises     Engine Fault Codes     Engine Troubles     Exhaust Systems     Steering and Suspension     Transmission Troubles     Tricks of the Trade Automotive World     General Discussions     Antique Car Talk     Car Shows and Events     The Bargin Bin     Motor Vehicle Inspection     Car Care Tips     Traffic Tickets     Gasoline, Motor Oils, Concept Cars and Engines     Auto Insurance, Financing, Leases, Warranties Truck Repair     General Discussions     Truck Engine Repair     Truck Suspension Repair Motorcycle Repair     General Discussions     Motorcycle Engine Repair CarJunky     Open Posting     Board FAQ's     New Board Suggestions

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