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Posts Tagged: rough idle

P0172, fuel in oil, Rough idle, engine run-on GM

P0172, fuel in oil, Rough idle, engine run-on GM Diagnose and fix P0172, fuel in oil, Rough idle, engine run-on GM GM has issued a service bulletin #PIP4783B to address P0172, fuel in the oil, Rough idle, engine run-on GM vehicles listed below. Before you perform any diagnostic tests, pull the engine oil dipstick, and check for the presence of fuel. GM has determined that a P0172 System Too Rich (Bank 1) may be caused by a defective high-pressure fuel pump that’s leaking fuel into the crankcase when the plunger … Read More

P0505, P0506, hard start, rough idle

Fix P0505, P0506, hard start, rough idle on Ford vehicles Fix P0505, P0506, hard start, rough idle Ford has issued a service #12-7-4 to address trouble codes P0505, P0506, hard start, rough idle on the vehicles listed below. The vehicles may also store enhanced trouble codes P2111 and P2112 after the keep alive memory has been cleared, the battery has been disconnected or the vehicle has a dead battery. On vehicles with over 10,000 miles the problems may be caused by sludge buildup in the electronic throttle body. That causes … Read More

Rough idle – Ford

Why do I have a Rough idle – Ford Ford has issued a service bulletin to address a rough idle problem on 2009 Ford Escape and Mercury Mariner vehicles with the 2.5L engine and six-speed automatic transmission built before 3/5/09. The rough idle appears when first started after an extended soak. The bulletin says that the rough idle usually happens with the transmission in Drive and the engine loaded (like when AC is on). As is more common these days, the problem is due to faulty software. Before you spend … Read More

Rattling noise F150

Fix Rattling noise f150 Rattling noise, rough idle, check engine light. If you own a 2004-12 Ford F150 or other truck with 5.4L three-valve V8 engine and experience a rattling noise, rough idle, check engine light, the repair may not be as serious as you thought. Ford has issued a service bulletin alerting dealers to defective variable valve timing solenoids. The bulletin says the rattling noise is usually accompanied by a rough idle and an check engine light. If you check the codes, you might see P0021 P0022 P0340 P0341. … Read More

How does an idle air control valve work

What is an idle air control valve Many people are confused about how idle air control valves work. An idle air control valve literally bypasses air around a closed throttle plate so the engine can get air at idle. Because it bypasses air, it’s also called an air bypass valve. Back in the days of carburetors, idle speed was adjusted by way of an idle speed screw. In fact, on many carburetors there were two idle speed adjustment screws; one for hot idle and another for cold. Turning the screw … Read More

Transmission slips – GMC Safari

Transmission slips – GMC Safari Rough engine and slipping transmission on 2004 GMC Safari van with the 4.3L V-6 engine. Before you even think of adding anything to your engine or transmission, clean your mass airflow sensor (MAF) sensor. It’s one of the known causes of engine and transmission issues. The MAF sensor is located in the air duct between the air filter box and the throttle body. The sensor contains heated wire elements that are cooled by the inrush of fresh air. The sensor measures how much power is … Read More

Rough idle Mazda 3

Rough idle Mazda 3 Rough idle, bad gas mileage on Mazda 3 with the 2.0-litre engine A vacuum leak can cause both a rough idle and poor gas mileage. And on this vehicle the positive crankcase ventilation (PCV) valve hose can leak and be very hard to diagnose. Even professional shops with smoke machines have a hard time finding this one. The hose is located under the intake manifold. Since new hose is cheap, try replacing it and the PCV valve and see if the condition improves. I’m betting it … Read More

Car stalls and has rough idle

Fix stalling and rough idle Taurus Sable P0191, P0300-p0306, P0316, P2197, stalling, hesitation, rough idle, poor performance. This could be caused by lots of things but the key might be the P0191 Fuel rail pressure sensor condition code. Because if the fuel rail isn’t getting enough fuel pressure, the air/fuel mixture will be lean and that will cause misfires and hesitation. It would also cause the O2 sensor to read lean. So start with the basics like a fuel pressure and fuel volume test. Or, you can start on the … Read More

Toyota Camry won’t start

Toyota Camry won’t start and has rough idle and hesitation If you’ve got a No Start Toyota with a 4-cylinder 2.2L engine or it has a rough idle or hesitation on acceleration and you’ve already checked spark plugs, wires, air filter, and fuel filter, it may be worth your while to drop $25 on an engine coolant temperature sensor. These sensors can give false readings to the ECM making it think the engine is warmer or colder than it really is. That would result in a rich or lean fuel mixture … Read More

Rough idle Ford Focus hesitation surge

Fix rough idle hesitation surge Ford Focus TSB 07-10-7 Ford has issued a technical service bulletin (TSB) 07-10-7 to address problems with a rough idle, rolling idle, or induction backfire on 2003-04 Ford Focus SVT models. They may also exhibit a hesitation or surge at a steady cruising speed. The problems usually occur after a cold start. Ford has identified one source for these problems. Direct your attention to the clamps at the intake manifold. Poor intake clamp sealing can cause separation at the rubber boots. Start by inspecting the … Read More

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