Tech Tip: Multiple Cylinder Misfire on Cherokee, Grand Cherokee and Wrangler Vehicles
The customer may experience an incident of engine misfire during certain vehicle operating conditions. The misfire may occur when the vehicle is operated between 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).
Tech Tip: Diagnosing a Cylinder that is Misfiring
A flashing Check Engine light and a P0301 to P0312 diagnostic trouble code are sure-fire indicators that one or more cylinders are misfiring. Occasional misfires may pass unnoticed, but a steady misfire is hard to miss. The engine usually feels rough, lacks power and uses more gas than usual. Sometimes a misfire may feel like a vibration. A misfire also will cause a huge increase in hydrocarbon (HC) emissions out the tailpipe, which can cause a vehicle to fail an emissions test.
Tech Tip: Jeep Cherokee and Wrangler Multiple Cylinder Misfire
The customer may experience an incident of engine misfire during certain vehicle operating conditions. The misfire may occur when the vehicle is operated between 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).
Tech Tip: Jeep Multiple Cylinder Misfire
The customer may experience an incident of engine misfire during certain vehicle operating conditions. The misfire may occur when the vehicle is operated between 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).
Nissan Tech Tip: Diagnosing an Altima Engine Misfire
The engine runs rough, gas mileage is down and more importantly the "check engine" light is on. That little illuminated check engine light strikes fear in the hearts and minds of the average vehicle owner – it’s supposed to. Otherwise, people would keep driving their vehicles as long as they could, eclipsing the light with a piece of electrical tape.
Diagnostic Solutions: COP Ignition Systems
For a number of reasons, the trend of modern engine management technology is leaning toward using coil-on-plug (COP) ignition systems. One reason is that COP ignitions are very compact and are very adaptable to individual cylinder tuning. With the exception of a few designs that incorporate a driver or “module” into the COP assembly itself,
Hybrid Engine Diagnosis & Service
The Toyota Prius and Honda Insight hybrids have been around since 2001; the Honda Accord, Ford Escape and Lexus RX 400h hybrids since 2005; the Honda Civic, Toyota Highlander, Mercury Mariner, Chevrolet Silverado and GMC Sierra hybrids since 2006; and the Lexus GS 450h, Saturn VUE Green Line, Toyota Camry and Nissan Altima hybrids since
Tech Tip: Top 10 Domestic Diagnostic Codes and Fixes
A Check Engine Light that’s illuminated is always a sign that something is wrong. But what? You usually can’t tell until you plug in a code reader or scan tool and read out the code(s) that have turned on the light. At least then you have a starting point for further diagnosis. Some people think a code is all you need to fix a fault and turn off the Check Engine Light. A diagnostic trouble code certainly helps, but it only tells you that some kind of fault has occurred, and maybe the circuit or component associated with the fault.
Tech Tip: Curing Rough Idle and Hesitation on Mazda 626 Models
Some 2000-2002 Mazda 626 models with the FS 4-cylinder engine may experience a rough idle, hesitation, stumble and/or misfire during or immediately after a cold start. A DTC P0303 may also be stored in memory. In extreme cases, the engine may stop running and multiple misfire codes, like P0300-P0304, may be stored in memory.
Who’s at Fault?…Top 10 Domestic Diagnostic Codes & Fixes
A Check Engine Light that’s illuminated is always a sign that something is wrong. But what? You usually can’t tell until you plug in a code reader or scan tool and read out the code(s) that have turned on the light. At least then you have a starting point for further diagnosis. Some people think