2010 camaro misfire
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Filed Under (Jeep) by admin on 03-10-2010
may experience an incident of engine misfire during certain vehicle operating conditions. The misfire may occur when the vehicle is operated between 80 – 112 KPH (50 – 70 MPH) and under light loading conditions, e.g. slight uphill road grades. This condition may occur at all ambient conditions, but is more noticeable when ambient conditions are less than 0°C (32°F). If the vehicle is equipped with On-Board Diagnostic (OBD), a MIL illumination may also have occurred due to Diagnostic Trouble Code (DTC) P0300 – Multiple Cylinder Misfire. Various single cylinder misfire DTC’s may also be present. If the frequency of misfire is high the Powertrain Control Module (PCM) may place the engine in “Limp-In” mode. The misfire condition may be caused by one or more engine exhaust valves that are slow to close. Late closure of an exhaust valve may be the result of no valve rotation and associated build up of carbon on the exhaust valve stem. This condition may occur when the engine is not allowed to run at engine RPM’s that are greater than 3,200 RPM. At 3,200 RPM or higher the engine exhaust valves will rotate if not impeded by high carbon deposits. Low engine RPM’s and high carbon deposits are associated with short trip driving where the vehicle engine is not allowed to fully warm to normal engine operating temperatures. Cold ambient temperatures will increase engine warm-up time and add to the opportunity of carbon deposit build-up on the stem of the engine exhaust valve. Verify that an engine misfire condition is present. Use of the DRBIII(R) during a road test, or a Co-Pilot data recording, may help to determine engine misfire and misfire counts. If carbon deposit accumulation is severe, then a cylinder leak down test may detect one or more cylinders leaking greater than 15%. Save any misfire DTC Freeze Frame Data that was stored for later misfire correction verification. Verify that the engine misfire condition is not caused by faulty engine mechanical or electrical components. If the engine mechanical and electrical systems are operating properly perform
Filed Under (Chrysler) by admin on 12-11-2010
OVERVIEW: This bulletin involves rotating all engine exhaust valves, replacing the valve spring retainer locks with a new design to increase valve rotation at lower RPM, inspecting/replacing the MAP sensor (as necessary), and decarbonizing the combustion chamber. MODELS: 2004 – 2006 2005 – 2006 (CS) (LX) Pacifica Chrysler 300/Magnum/Charger SYMPTOM/CONDITION: The customer may experience occasional engine misfire (rough running engine) during certain vehicle operating conditions. In addition, MIL illumination may also have occurred due to Diagnostic Trouble Code (DTC) P0300 – Multiple Cylinder Misfire. Various single cylinder misfire DTC’s may also be present. If the frequency of misfire is high, the Powertrain Control Module (PCM) may place the engine in “Limp-In” mode. The misfire condition may be caused by one or more engine exhaust valves that are slow to close due to a build up of carbon on the valve stem. DIAGNOSIS: 1. This condition may occur when the engine is not allowed to run at engine RPM’s that are greater than 3,500 RPM. At 5,000 RPM or higher the engine exhaust valves will rotate if not impeded by high carbon deposits. Low engine RPM’s and high carbon deposits are associated with short trip driving where the engine is not allowed to fully warm to normal engine operating temperatures. Cold ambient temperatures will increase engine warm-up time and increase the likelihood of carbon deposit build-up on the stem of the engine exhaust valve. Fuel detergent quality may also contribute to the condition; the customer may want to try a different brand of fuel. 2. Verify that the engine misfire condition is not caused by faulty engine mechanical or electrical components. 3. If the engine mechanical and electrical systems are operating properly perform the Repair Procedure.
Filed Under (Vauxhall) by admin on 17-04-2010
Caller reported to the helpline that the vehicle had developed a misfire under load, especially when the engine was hot. It was also mentioned that as the misfire occurred, the engine would suddenly appear to run on only 3 cylinders. The engine running on 3 cylinders would continue until the ignition was switched OFF. If the engine was re-started the engine would run on all 4 cylinders again until the misfire reoccurred under load, and then the engine once again appeared to be running on only 3 cylinders.
The initial misfire fault under load was finally traced to cylinder no 1 on the engine. The fault was caused by a poor output from the DIS ignition coil pack fitted to the vehicle. Upon testing the vehicle, it was discovered that when the misfire occurred on cylinder no 1, the Multec engine management ECM would switch OFF the fuel injector for the affected cylinder. The caller reported that when the engine was switched OFF and then restarted the misfire would disappear, and the fuel injector for cylinder no 1 would operate normally again
Filed Under (Honda) by admin on 25-12-2010
Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: Has a misfire on start up only. Sets cylinder #1 misfire code P0301 and cylinder #4 misfire code P0304. Sets pending misfire code P1399 as well. The problem only lasts a few seconds. Suspecting headgasket since the coolant level is low and smells anti-freeze when the engine is started. 1. Check for evidence of anti-freeze on the spark plugs or in the cylinders. Pressure test the cooling system and check for anti-freeze going into the cylinders. 2. If not anti-freeze, check fuel pressure and see if it holds in case a fuel injector is leaking down. 3. If pulling the cylinder head to replace the headgasket, have the cylinder head sent out and checked for cracks. Cylinder Head Cylinder Head Gasket Fuel Injectors Cylinder head was cracked. Other causes of a misfire like spark plug wires and incorrect valve adjustment are common but those wouldn’t likely be a misfire for just a few seconds on cold start up.
Filed Under (Ford) by admin on 03-12-2010
FORD: 2010 Fusion 2009-2010 Escape ISSUE Some 2009-2010 Escape, Mariner, 2010 Fusion and Milan vehicles equipped with a 6F35 automatic transmission, may experience transmission shift concerns after towing the vehicle with all 4 wheels on the ground (Flat tow) such as behind a motor home or a truck. The transmission shift concern may be caused by heat build up in the transmission due to the transmission fluid level being too high, towing speeds above 65 MPH (105 Km/h) and/or not stopping to run the engine at idle for 5 minutes every six hours or less, to cool the transmission. MERCURY: 2010 Milan 2009-2010 Mariner SERVICE PROCEDURE There are specific instructions listed in the Owner Guide that must be followed to recreational tow/flat tow/tow a vehicle with all 4 tires on the ground. Advise customers of the following expanded recreational towing guidelines. 1. Transmission fluid level must be checked at operating temperature of 185 °F – 200 °F (85 °C – 93 °C), per Workshop Manual (WSM), Section 307-01. At this temperature, adjust fluid level between minimum line and the minimum hole at the bottom of the hash marks on dipstick. This level is within the safe operating fluid level and does not require the customer to have the fluid level readjusted after flat tow operation. (Figure 1) 2. Maximum towing speed is 65 MPH (105 Km/h). 3. Do not flat tow the vehicle for greater than 6 hours at a time. 4. Start and run the engine for: a. 5 minutes before towing each day b. 5 minutes every 6 hours or less. c. While running the engine at idle for 5 minutes, with foot on the brake, shift through all gears. These guidelines are designed to prevent damage to the transmission due to overheating. If setting the fluid level for a customer that will be recreational (flat) towing the vehicle, set the level between minimum line and the minimum hole at the bottom of the hash marks on dipstick (Figure 1) per WSM Section 307-01.