The reason for the recall was for loss of braking, but vacuum leaks would also cause the check engine light to come on. I had the engine running and checked every single vacuum hose and any other hose on sight. When you changed the spark plugs, did you happen to notice if any of them were particularly dirtier than the others? A common trouble code with the Toyota Tacoma is P0172. I saw in the report that the injectors are fine as well as the vacuums. Can I ask what kind of spark plugs you have? Eric at did a great walk-through of troubleshooting this code on a 2006 Chevy Silverado where he ended up relearning the fuel trims to fix it. Good luck figuring out what is wrong with your Tacoma. The first symptom is a check engine light followed by black smoke in the exhaust.
Here are the typical symptoms that something is wrong when you have code P0172. This youtube video is a great resource for diagnosing the P0172 trouble code in your Tacoma. As a matter of fact, this error code is very similar to P0175, in some cases and scanning tools, the vehicle may show both codes simultaneously. So i accepted because I have no other choice. Somebody tells me a fuel pump somebody else tells me maybe my mass air flow sensor. Thinking about blow-by, did you notice any oil fouling of the spark plugs? If you have a Flex Fuel vehicle, measure your alcohol content and reset the fuel trim level. Ideally, this should be around 1% to 2%.
If the oil smells like fuel, change that, as well. Definition Combustion engines work by burning the mixture of air and fuel of about 14. This is unlikely the cause of the problem, but it is still possible. If the air ratio decreases to lower than 14. The vehicle can still be driven despite the code, but you might notice a significant increase in fuel consumption and a strong scent in the exhaust fumes.
How to check O2 sensor using monitoring obd data? Measure fuel pressure and then shut the engine off. After driving 12 km the check engine light it pop up again with same 0172 code. You may also smell a strong fuel odor and see black soot in the exhaust tip or the back of the car, an indicator that a lot of unburnt fuel is making it through the system. When P0172 is set, the means the fuel trim is somewhere around -15% or even as low as -30% compensated. A common trouble code with the Toyota Camry is P0172. I reset the codes, and drove for about a week or 2. So you should chech it on our car models.
I did a full Valve Adjustment, No More Ticking. A fuel pressure leakdown test might point to a leaking fuel injector, particularly if you notice that the oil smells like fuel or if the engine is misfiring. Tacoma P0172 Code Defined P0172 is thrown when the oxygen sensors detect that the air fuel mixture is too rich. This particular ratio was chosen because it was discovered to have the highest power output but lowest fuel consumption rate. This pollutant can be very poisonous and contributes to air pollution. I will inform you how it goes.
Also, vacuum leaks would lead to a lean problem, not a rich problem. Take a look around and see if you can find the vacuum leak. I need your reply soon. I think I would start with checking the spark plugs, perhaps doing a compression test, and a fuel pressure test. I have had it checked again by a diagnostic machine and the technician told me that we have a a vacuum leak.
You will notice a decrease in gas mileage and over time the car will eventually start stalling a lot. I thought I was done. There could be a vacuum leak. You could have another problem, too, though. Fuel pressure should be 40 — 45 psi, whether the engine is off or idling.
Is the coil pack wire harness in good condition? Check that everything is connected. Make sure you have proper fuel pressure, about 36 psi at idle, up to 45 psi with the fuel pressure regulator vacuum line disconnected. It means that the motor is running with a rich condition. Cleaning may solve the problem. The cost of fixing a P0171 code will vary. What are the symptoms of code P0172? Need help with a P0172 code? Still shows Bank 1 problem.
If there are fuel problems, such a leaking fuel injector or stuck fuel pressure regulator, unmetered fuel will simply dump into the cylinders. The warranty on my turbo is going to expire after 20 days only. How serious is the P0172 code? Thanks a lot for your time and effort to help me. Over time, however, dirt and grime builds up, and it can easily find its way into the engine and control systems. I had a mechanic look at the cylinders and he said they look good. Is there anything else i should do considering the conditions i found? That might help to isolate the misfire so you can focus on that. Fuel pressure may drop slightly, but should remain stable for at least 10 or 15 minutes.
If it sticks, you have a faulty sensor. Hi ben, First of all, thanks for your reply. Not one thats still funtioning nomally. However, if the margin of compensation is too large, then a P0172 code will likely set. If the fuel pressure continues to drop, you could have a leaking fuel injector, which would lead to a rich condition and possible misfire condition. Until I reached behind the engine right in between the engine and the firewall.