It happens even at a noon sunny day 80-90 degree. WOT 58lbs Idle 62-64lbs Just Right HFCM Water Separator Drain Plug Upgrade Ford Cetane boost every . Also when the truck is about to die the vacuum drops way down (14-15). Have to keep giving gas. If its running rough like that right when you start it up it shouldn't even be in closed loop looking at the O2 sensor yet so I doubt thats an issue. Then it slowly starts to clear out. There seems to be some lack of power but I'm not sure if they are related. For a weak cylinder, concertrate on the usual things such as ignition, fuel pressure, and fuel system. this sounds like the idle may be staying to low at times if it smooths out with ac on, when the ac is turnned on the computer raises the idle a touch to make up for the strain on the engine from the ac compressor, clean throtlebody and look at and clean idle air control valve, if this valve is not controlling the idle when needed the engine will … Truck is running very rough at idle. I'm on day 4 of this and it's driving me nuts. Oil will also seep down the sides of the engine causing a persistent burning smell in the cabin once the engine has warmed up. a misfire, engine mounts breaking, fuel intake clogged up, timing belt, dirty or malfunctioning spark plugs, throttle body problems, or. Have you been losing coolant slowly? When I first start it up it runs around the 900 mark and then slowly drops to the 500 mark in park. A plug that is damaged or installed incorrectly, can result in fuel being burned at an inconsistent rate. 4. 3. 7.3 Excursion 4x4 with 220K with Glow plugs replaced last week. Actions taken: Cleaned TB, run BG44k through tank. Took it to a repair shop, they indicated it was running lean. It only happens at first start-up in the morning. When starting the truck, it starts by dropping rpms, and then rising, and then dropping again. As soon as I put it in drive it drops further to the 400 or 350/300 mark. While the engine is warming, make sure it deactivates the choke linkage. Use NGK or Nippon Denso plugs only in your Honda. I think this started after I changed plugs at 155,000km. The ecm is not forwarding sensor the signal to the tach but is to the VP (maybe even goes directly to the VP). WOT 58lbs Idle 62-64lbs Just Right HFCM Water Separator Drain Plug Upgrade Ford Cetane boost every . ScottB21: After several seconds (about when the engine would normally go from high idle to normal low idle) it smooths out to normal behavior. This sensor signals the car's computer when the engine's coolant is cold or hot, so the computer delivers more or less fuel to the engine. If a cold front came through during the day and the temp dropped then the rough startup would return. Jump to Latest Follow . Any ideas? Nov 3, 2010. I have a 2002 Tundra 3.4 V-6 with 72K. The ONLY time when it does not do it when it's plugged in (Weird). If I continue to let the car idle roughly for about a minute, the engine will smooth out and the rough idle will go away. Air intake/system is all cleaned, fuel system, injectors, and fuel filter is new. Need some help: my 323ci has a rough idle at start up.after driving for a while, it is fine. During the first 2 or 3 minutes - up to 5, the O2 sensors aren't hot enough to give the ECM information. Jump to Latest Follow . Drive to work, park all day and then have a smooth, normal idle when time to leave. An electronic component that is out-of-spec when cold may not be apparent to the computer. Yesterday, this rough idle (sounds kinda like its not firing on all cylinders) lasted considerably longer and took about 2-3 miles of driving before it cleared up. Most of the time my 2001 Cherokee Sport starts fine and runs smooth. Eventually it sorts things out, sees a smooth rotation, and says ahhhhh. Data logged, on the rough idle start I have noticed a couple things, the IAC is almost closed during the bad idle and when it begins to open the idle smooth out. finally, it smoothed out. the idle will jump to 1100 then settles down at 900 and then slowly drops as per normal warm up. Being in atlanta what the outside temp? I then rev it up to about 2-3000 rpm and i can hear injectors coming online one by one. On a cold start (overnight at -6C in the garage, or after working all day) the engine runs extremely rough, with vibration and much noise. noticed the last few times ive driven the car that on occasion it will idle a little rough on startup for just a few seconds then smooth out. A dirty EGR valve can rob horsepower and cause unstable idle issues and acceleration issues. Reply. one particular time, it died. It idles correctly each hot start. It's not the choke. Cold or Hot (more so when cold) upon start up, the idle is rough and choppy/sputtering, I also must give it gas to start or else it can't sustain itself, I also have to keep revving the engine for about 3-8 secs until the car finally smooths out and is ready to go, from there on its smooth sailing, well, there is a minor bump during idle, so . Summer FL overnight temp would not get cool enough to activate a cold start in the morning. Jump to Latest Follow Hey everyone! Once the idle smooths out the tach dies and it sounds normal. Then goes away after about 30-40 seconds and the truck runs great. It's rough for about 30 seconds, then seems to come under ECU control and idles smooth and quiet after this. 135,000 MILES. In rare cases, it is caused by misfires from a bad spark plug or coil. By cleaning the EGR valve, you can assure that the emissions sy. Let it cool down for a couple hours, and it will start fine, then dies. AUTOMATIC. This continues for a minute or so, then dissapears and the car drives just fine. It will restart but runs very rough and dies at idle or low rpm … read more I can drive 2 miles to a stop sign and it idles normal at about 700 and is fine there after as long as its warm. no major issues. Check injector #3 wire and ensure that the injector is rotated to a 2 o'clock position. The cold-start injector is in charge of smoothing out a rough idle when the engine is operating at a temperature that is below optimal levels. A cold engine requires more fuel than a warmed engine. it never misses a beat while actually driving until today. I have to rev the motor to about 2K one time to smooth the idle. But - check for a vacuum leak, hoses, TB base gasket, injector O rings, even the manifold gasket. Accelerates fine and top end is fine. The Camshaft actuators were replaced under recall already. Extremely rough idle upon start up, as if two plug wires are off. I apply gas and it continues to stumble and jerk but after about 30 seconds, it smoothes out and runs perfectly as if it's throat just needed clearing. May 2013 edited April 2014. in Chevrolet. If I use the truck everyday, it starts without running rough and without the blue smoke. Tachometer goes ape s*&t. Then suddenly smooths out after about 1 minute. Confirm sleeve is flush to intake manifold surface around injector. It almost sounds like it has some kind of race cam, lol. Turned out to be a blown head gasket and cracked head. The most common cause of rough idle is a vacuum leak or a failed PCV valve. The ONLY time when it does not do it when it's plugged in (Weird). A car shaking at idle, especially, is usually a sign of either. It has some white smoke at idle which smells like un-burnt fuel. After sitting all night and starting the car in the morning it would idle rough for maybe three or four seconds then smooth out and run fine the rest of the day. When I start the truck, it starts up okay, then after 5 seconds it goes into a bout of gurgling/running rough for 20 seconds, then it levels off after the RPM's jump 100-200 RPM's then slowly eases back down. This problem started suddenly. He has been told it has something to do with the type of oil that it has been running. I need to get the engine . I have a 1992 Chevy pickup (C1500, 5.7L, V8, 150,000mi), It started running rough and within 10 minutes worsened until it finnally died. The RPM will be lower than it is supposed to, and off of a snap throttle the engine . when cold--gaskets re-expand when the engine is warmer so rough idle disappears. Has cut out at a stoplight. after that it evens out and runs just fine. With the car in park or neutral, the idle holds around 750 rpm, but is still a little rough. I tracked it down to worn injector tips. Cleaned Camshaft actuator solenoid. Having an issue with a rough idle condition, goes away at about 700 rpm. The issue obviously affects RPM enough for the FENG to detect the change, and respond accordingly. Things I have done, 1. Answer (1 of 10): Hard to say with so little info, but it sounds like cold enrichment is not working. Only show this user. Solving Rough Idle and Low RPM at startup on a 1986 to 1993 CIS Engine - On Demand Video. After sitting all night and starting the car in the morning it would idle rough for maybe three or four seconds then smooth out and run fine the rest of the day. Have a buddy that owns a '97 F-250 7.3 psd that has a problem with it at startup. Need some help: my 323ci has a rough idle at start up.after driving for a while, it is fine. Check And Replace Spark Plug And Wires (If Needed) Turn on the car's ignition and let the engine warm up. Based on my limited experience, common reasons for rough idle when cold include: Vacuum leak at intake manifold that closes when metal warms up. . The computer sees the air fuel ratio numbers, checks them against instantaneous rotational velocity (every time each cylinder fires) and makes the only two changes it can make; timing and fuel injector pulse. A rough engine idle, can be caused by, spark plugs or wires. That's when it settles down at 600 rpm. Whole process from start, rough and back to smooth is under 20 seconds. The MIL is active with a glow plug fault and also a FICM communications fault according to my tech 2. Rough idle at start up RAY HERBERT MEMBER 2001 FORD TAURUS 6 CYL FWD AUTOMATIC 140,000 MILES Causes of rough idling during cold starts. On Demand Video. I've seen a slow head gasket leak manifest itself by seeping a bit into the offending cylinder when the engine sits. After the engine warms up idle speed will increase and the engine may smooth out (although acceleration may have some hesitation until the engine gets real hot. The bigger issue is that the truck has a very rough and choppy idle. Nov 3, 2010. Install the other sleeve with the slit on the downward facing side of the injector. Hi all, My 2014 2.4 starts rough from cold and the exhaust smells strongly of gasoline. Only show this user. Thanks *A little more info to the problem: The car was outside in sub freezing temps for two days before the overheating. If I play with the throttle it will smooth out and then start to find its proper idle. The RPMs drop to 500 and bounces to 700 for a few seconds, 5-10 maybe. I assume this acts like a choke and needs to be closed like this. . I have a K&N filter, new plugs, new fuel filter and PCV valve. Of all these, most will lead to reduced engine power, especially at idle. 87' 305ci 4bbl car, when i start it in the morning when its real cold out the car sounds like it has a big lope its choppy with very low idle. It will start, chugg for a few times then smooths out. INSTALLATION PROCEDURE Install the upper manifold assembly. I have a 97 F350 7.3 PSD that i bought in Texas. If I use the truck everyday, it starts without running rough and without the blue smoke. If I turn it off and restart, it starts perfectly and runs like a champ. The first step I take to solve a rough idle issue is to start with a good tune up. Turned out to be a blown head gasket and cracked head. It could also be caused by other air-fuel mixture-related issues like bad fuel injectors, EGR valves, or low compression. It recently got overheated and broke the reservoir bottle. One of the most common causes of rough idle on a cold engine is a faulty ECT sensor. FICM voltage at 46.5 to 47.0 at startup runs ruff for about 1-2 minutes then smooths out,the FICM at 48.0 volts after it runs for a few minutes.no codes and is underpowered for the first five or ten miles then has . . . Thanks *A little more info to the problem: The car was outside in sub freezing temps for two days before the overheating. When the truck is started, it runs fairly smooth but after a few seconds it transitions into a pretty rough idle, with the engine actually shaking. It's done this when it's anywhere from 60-100 degress outside. Any ideas? No Codes. If your vehicle's idle is rough, possibly rising and falling, or having difficulty maintaining a steady rate of rotation, you may have a problem that needs fixing. The interesting thing is that if you even just slightly nudge the throttle it immediately clears up and runs . I have a 2011 Chevy Equinox that is also have the same engine problems (diesel-like start, rough idle, stalling, etc). 3. air intake issues. Has about 13K miles on it. . If you press the gas, the jeep has no power but if you slowly press the accelerater, it will slowly begin to act normal. Spark plugs use the electrical current; received from ignition coils to ignite the air/fuel mixture, within the combustion chamber. Once it starts, it still runs rough for a while then smooths out. Any advice? Bad temperature sensor (there may be several temperature sensors) Moisture somewhere in ignition system. I have to rev the motor to about 2K one time to smooth the idle. the engine will smooths out and runs just fine AND will start just fine the rest of the day. That's exactly how it acts. On cold startups it runs rough for 2-10 seconds. Was clean even after 200k, first time I've pulled it. Could that have caused this? So I own a 2002 Dodge Dakota 3.9L Quad Cab w/ 100,000+ miles, and it has been giving me a lot of grief lately. 4WD. I figured I'd turn to the more seasoned and committed crowd for advice/answers. SKU: VM-OVR . Problem existed before the glow plug replacement. Table of Contents Save Reply 2002CTD Registered Joined Jul 13, 2011 3,871 Posts Usually towing a 14.9K RV 5th wheel. The ECM richens the mixture somewhat (a generic setting) to make it run smooth during that time. I have been struggling with an issue that seems to be pretty common for the 5.7 Hemi. If it sits for about 5+ hours, the rough idle is always present. Video of what I'm talking about here: Car Trouble - YouTube. Very rough idle with a repetitive cycle that is smooth for a couple of seconds then misses badly, occasionally stalling. And i have an issue with it, it has a rough idle from the start, and at the beginning of starting up the car, it tries to clear up once or twice, then goes back to the rough idle. advice needed. The idle might smooth out for a minute or too but then gets really rough again. The "problem" was occurring all weekend before I dropped it off to the dealership on Monday. 2012 3500 DRW Laramie, Tow Max, 3.73, B&W Companion. After it warms up for a while, it starts to run rough. The major problem with all of this is it really just started doing this. My fuel trims at cold start are often completely out of whack (LTFT -9%, STFT +16% : net +7%), but once the engine is warmed up my idle is smooth and my ST+LT fuel trims balance out (LTFT -3.91, STFT +3.91 : net 0). Jun 24, 2014. Connect the negative battery cable. After all that, it ran pretty decent warm, much smoother than it had with the previous injectors. Prismatic said: I had a similar issue. Since a smooth idle depends on just the right mixture of fuel and air, there can be many possible places where the fuel and the air are not being processed properly. Next, inspect all the components to find the actual cause of the rough idle. It seems ignition related. Install as an assembly, backup O-ring, large O-ring, filter and small O-ring. Recently, I noticed on cold starts in the morning or after the car has sat for a long period of time, the idle is a bit rough for a few seconds, and there's a sweet smell like maple syrup coming from the exhaust with a decent amount of white vapor/smoke that goes away after the idle smooths out and I drive the car about a block's worth of distance. 99 3.0L - Rough IDLE at startup then clears within a minute: justinftw: 3.0 Vulcan Tech: 7: 10-27-2012 07:21 PM '94 Temporary rough idle/bog at startup: KSteng: 4.0 SOHC / 4.0 OHV Tech: 2: 08-29-2012 01:03 PM: Clacking from engine with rough idle at startup. 6.0L Starts Rough then Smooths out. $3.99 . The tac always stays steady and does not fluctuate with the idle at all. So if you have a rough idle with your 4 cylinder Honda, this might be a contributing factor to your rough idle. Thanks, Steve I know the coils can be the culprit of a rough running motor, but I tend to rule them out, since it smoothes out everyday after 10 miles. 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