Rick's Free Auto Repair Advice

Posts Tagged: misfire

P0171, P0300, P1174

How to fix codes P0171, P0300, P1174 GM has issued a technical service bulletin # 08-06-04-001B to address trouble codes P0171, P0300, P1174 on the following vehicles: 2006-2007 Chevrolet Cobalt, HHR 2006 Pontiac Pursuit (Canada) 2007 Pontiac G5, G6 2006-2007 Saturn ION with 2.4L Engine (VIN B, P – RPO LE5) P0171 System too Lean (Bank 1) P0300 Random/Multiple Cylinder Misfire Detected P1174 Fuel Trim Cylinder Imbalance The most common cause for these types of trouble codes are vacuum leaks or plugged injectors that deliver too little fuel and cause … Read More

Diagnose misfires

Diagnose misfires If you own a vehicle with coil packs and spark plug wires or a coil-in-plug setup, you may see these misfire codes. This post will help you diagnose misfires. Diagnose misfires — is it the spark plug or the ignition coil? Whether your engine is equipped with coil packs and spark plug wires or coil-on-plugs, always diagnose misfires by checking the spark plugs. Why? Because a worn or damaged plug can degrade your spark plug wires and even damage the ignition coil. If you replace the wires or … Read More

Engine Runs Rough

Engine Runs Rough If you find any of these trouble codes P0300, P0301, P0302, P0303, P0304, P0305, P0306, read this. Here’s how to diagnose engine runs rough after going through a puddle on any of these vehicles: 2008-2009 Chevrolet Colorado, TrailBlazer, 2008-2009 GMC Canyon, Envoy, 2008-2009 HUMMER H3, H3T, 2008-2009 Saab 9-7X, All Equipped With Engine RPOs LLR, LLV, LL8, here’s what to check out. The ignition coil bolts on these vehicles is vented. If you drive through puddles and water splashes onto the bolt vent holes, the water will … Read More

Why does my Malibu Stall

Fix a stalling Malibu If you’ve got a 2004-’05 Chevrolet Malibu with the 2.2L engine and notice severe hesitation and your Malibu Stalls and RPM Drops, this may be the fix. The problem can occur if you’re doing parking lot maneuvers or during a deceleration. The cause is a voltage spike from the radiator fan that scrambles the electronic ignition controls. Don’t waste your time replacing the crankshaft sensor—it won’t help. Instead, install a diode protected jumper harness (P/N 15242641). Splice it in into the cooling fan circuit using the … Read More

P0300 P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308 P0309 P0310 P0311 P0312

Fix code P0300 P0301 P0302 P0303 P0304 P0305 P0306 P0307 P0308 P0309 P0310 P0311 P0312 Pinpointing cylinder misfire codes People ask me about misfire codes after they’ve replaced all the spark plug wires, coil, and plugs and they still have the code. Here’s a quick explanation of how a pro would attack the problem. First, if you’re getting a P0300 Random/Multiple Cylinder Misfire Detected code, that would indicate a universal problem that applies to all cylinders. In that case, start by checking fuel supply issues like poor fuel pressure caused … Read More

Chevy Silverado No Start

Why won’t my Chevy Silverado Start Shops are reporting Chevy Silverado No Start pattern failures on the ignition systems on 1999-2007 Chevrolet Silverado 1500 4.3L vehicles. The problem is usually caused by a broken ground wire at the ignition coil. This wire is white/black and may not appear to be broken. But the wire inside frays and causes intermittent no-start conditions. To check the condition of the wire is the vehicle does start, run the engine at operating temperature and have someone wiggle the wire and listen for misfire. This … Read More


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