Question about 2004 Acura TL

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Po174 check engine light comes on for few days and then it goes off .i change all the sensors the o2 and the air fuel,injectors about a month ago and the light just came back on.

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  • maxnewyorker Apr 05, 2009

    i have exactly the same problem with my tl 2004. I changed the o2 sensor. And i think that the guy who wrote the comment suggesting to check vacuum lines is probably right. Because i have this strange airy sound when i push accelerate. i will let you know if i will find what was wrong:) Good luck



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Have you checked all vacuum lines etc, for leak, or crack. It's reading lean on bank 2. Your coolant isn't going down is it?

Posted on Mar 05, 2009


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Engine not revving out at times

black smoke is excess fuel entering the cylinders. and does not burn completely. poor fuel milage is also a complaint of black smoke from tailpipe.check your O2 sensor, your MAF sensor and for vacuum leaks. Could be air intake check your air filter, but probably the O2 sensor.The O2 sensor. located on the exhaust pipe prior to the muffler, looks like a spark plug with a wire that comes off the tip and leads into the wire loom.But the 02 sensor will turn the check engine light on.other intake components like sensors, fuel injectors and the fuel-pressure regulator.should be checked. good-day!

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Repeated PO171 Lean Code:2008 Pontiac Vibe

First thing i would do is take the mass air flow sensor off and clean the small thin wires inside with a non-chlronated brake cleaner let dry for 10 minutes then re-install.If that does'nt help then check the fuel pressure it could be a weak pump or clogged fuel filter.Then check for vacuum leaks and next i would have the injectors cleaned.

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2000 Lincoln Navigator - few days ago started idling very rough when truck is at a stop or in park. Service Engine Light came right around time I noticed that it was idling rough when stopped. Following...

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I have a 1994 gmc 1500 truck with a 5.7 fuel injector is pumping fuel and the other injector is not!!!!i swapped the injectors and its not the injector.

Go to the parts store and get a noid light for your truck, plug it into the injector electrical and turn the engine over to see if there is electrical pulse, also check the fuel pressure, the pump needs 9-13 psi with the engine running. you know if there is no pulse your going to need to check the wireing first. let me know

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P0174 is SYSTEM LEAN BANK 2. If you do not have any rough running or missfires. Check for any vacumm hoses that may be damaged or loose. Any code that is set on OBDII has to be cleared with code reader. If you have any rough running or mussfires, check fuel injectors for proper operation. If this helps, please rate.

Apr 30, 2009 | Ford Mustang Cars & Trucks

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05 mercury sable check engine po174

You has a vacuum leak on the engine.

In order to troubleshoot this, you must start with a clean engine wipe down.

The major offender parts are

air intake gasket on the manifold

air tube after the mass air flow sensor

rubber seal under idle air control IAC motor


Warm up the engine for 15-20 minutes (LEAVE THE engine at idle) then spray a little Barmen carburetor clear on the potential air leak location (ONE AT A TIME) and listen for a surge in rpm.

If the engine speed go higher that's mean the carburetor clean (ADDITIONAL FUEL) got into your engine and that's the gasket you need to change.

There may be multiple leaky spots so take your time and check all rubber gaskets,sensor and hose that are lead into the intake manifold.

When you finish fill up with one tank of Chervon to clean out the injectors.

Please post more information after your inspection.

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My 2002 Ford Windstar van is giving the code ''PO174 System lean bank 2''. Usually runs bad when it is damp, raining or winter, but never stalls out. This time (winter) check engine light on. Van has...


Sounds like it could be a bad Oxygen sensor on that bank. check for vacuum leaks first but since it is only on 1 side of the motor is most likly a O2 sensor.

get the engined scanned and look at the reading from that O2 sensor. But if you have more then 100k and it has never been replaced then I would juts replace the front 2 o2 sensors as they are only good for 100-120k. You don;t need to replace the rear O2 sensors only the front 2.

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After fighting with mine (2003 GMC 5.3 liter), I believe I have it solved. Mine was throwing P0171 and P0174. Also, there was an occasional p0101. I had a rough idle sometimes right when I started it, but usually after 5 minutes when the fuel system went in to closed loop mode (about 200 RPM swings at idle that slowly went away). Days below 10 degrees were much worse.

I cleaned the MAF sensor, checked fuel pressue, changed spark plugs, and cleaned the throttle body. The code basically means that more fuel is being dumped in by opening the fuel injectors longer. The code is set by the long term trim on the injectors be over 23% (opened 23% longer than they should be based on sensor readings). The extra fuel allows the engine to run with the right air to fuel ratio (not necessarily lean as the code suggests). Causes could be low fuel pressure (from pump, fuel regulator, clogged injectors, and such). Running a scanner on it for several days, everything looked normal.

That is all background. The other cause is that air is being introduced into the intake after the MAF sensor. Extra fuel has to be added for the air that the MAF does not see. I did some digging and found out that the gaskets between the plastic intake manifold and cylinder heads are prone to leaking. I tried to spray throttle body injector around where it might leak to monitor the engine speed, but the air leak seems to be less on warmer days and leaks can occur on the inside edge of the gasket where it is hard to reach with the spray (there are foam ends that open the inside edges to atmosphere). I replaced the gaskets and my long term trim dropped to about 6% from 10% on warmer days to pegged out at 25% on cold days with a cold engine. The work isn't too bad as long as you are patient enough to get the plugs off of the ignitors. I have yet to test it out in cold weather, but I am pretty confident.

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