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Bank 1 lean code on audi a4

Already replaced spark plugs, fixed vac leak hoses, maf and o2 appear to be ok. Engine rpm between 3000-4000 before engaging.

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Recently changed spark plugs on 2003 kia spectra. Afterwards it started to sputter at low rpms. I changed fuel filter and it still sputters. When moving and over 1000 rpm it runs fine. What do I do?


get urself a can of carb cleaner...brake cleaner...whatevers clever
with the car running spray it over vac maf sensor...until you hear the engine bog down. now you found ur vac leak or anything else and leaking.

Feb 07, 2015 | 2003 Kia Spectra

1 Answer

I have a 1990 ford 460 EFI cylinders 1,2,6 has no change or little in RPM when spark plug wires removed.The three spark plugs has black carbon on them. I replaced them with new ones with new wires.Co


check that the egr valve is not stuck open remove it and cover the hole on the intake side and see if it goes away or with engine running remove the vac line from the valve and install a short length of hose and suck on the hose to draw a vac on the valve it only takes 3-5 inches of vac to open it the engine should stall or run even worse if it is not stuck and if it was stuck open you didnt change anything

Dec 07, 2012 | Ford F 450 Super Duty Cars & Trucks

1 Answer

Replaced intake manifold in 1999 lincoln towncar now intermintent low rpm missing


My first guess would be a vac leak around one of the gaskets, or a hose is disconnected. A leaking gasket could change with the engine temp.

Jul 06, 2012 | 1999 Lincoln Town Car

2 Answers

Engine sputters on iddle.


The codes for the O2 sensors mean they are not providing the data expected by the computer. Sometimes this means there is a problem upstream in the engine.
If the engine is missfiring on one or more cylinders, it should set a code for those cylinders. Same thing with a vac leak.
But low fuel pressure would not normally set a code.
Depending on which sensors are setting codes, the catalytic converter could be faulty. Even a dirty air filter can cause problems with the O2 sensors.

Jul 04, 2012 | 2004 Cadillac Deville

1 Answer

1999 Chevy G-30 utility van code p-0174 , cleaned then replaced MAFcleared code, back on 50 miles later, found vacum leak hose off vac. ball, code cleard 50 miles light back on,


what size engine do you have in the g-30 van. is it the plastic plenum. if it is there are rubber o-ring seals that go bad all the time and will cause the p0171,p0174,p0172,p0175 these are all lean codes also check for fuel pressure to make sure it is up to specs.
have you changed your fuel filter lately this can effect fuel trims.

Jan 09, 2012 | Chevrolet Cars & Trucks

1 Answer

I have a 2005 f150 with a 5.4 and am getting a code po506 what is this!


PO506 --- Idle Air Control System RPM lower then expected

Clean Throttle Plate
Check for any air/vacuum leaks --

Ducting from air filter to throttle,loose or a vacuum leak
Throttle Body Leaking
MAF Sensor
IAC Valve gasket
Egr Gasket
PCV Seal

Hopefully you have installed new spark plugs since 2005
Also replaced the front (2) O2 Sensors at 100,000 miles
Cleaned MAF Sensor once or twice a year

Jul 12, 2011 | Ford F-150 Cars & Trucks

2 Answers

Check engine lights on 99 ford ranger ODB codes 3- need solutions before in shop takes me to the bank help #1- P1506 #2- P1131 #3- P0171 I already know what they mean, got them written down. Need...


DTC P1506 is set when the PCM detects the engine idle speed is greater than the desired rpm. This is most commonly caused by a dirty or bad IAC valve. Cleaning the throttle body will, most likely, cure this problem.

p1131 means that the bank #1 O2 sensor, the bank closest to the firewall, cylinders 1-3 is showing a lean mixture. Could be a vacuum leak, a misfire on that bank, an exaust leak upstream of the O2 sensor, fuel control or injector problem on that bank, a faulty O2 sensor, faulty PCM, faulty wiring in the engine control wiring harness.

P0171
In the vast majority of cases, simply cleaning the MAF sensor does the trick. I find it's best to take it off and spray it with electronics cleaner or brake cleaner. Make sure you are careful not to damage the MAF sensor, and make sure it's dry before reinstalling also Inspect all vacuum and PCV hoses, replace if necessaryCheck for a dirty fuel filter and proper fuel pressure

May 19, 2010 | 1999 Ford Ranger SuperCab

2 Answers

I have code 174 and a spark knock at high rpm's. What are some things I should check?


P0174 indicates a lean condition that the computer is trying to compensate for.. I would look for vacuum leaks. The vacuum hoses near the throttle body will dry out and split causing a leak. I would spray a little bit of carbeurator cleaner around the base of the throttle body and listen for an increase or change in the engine idle speed. If the idle changes the try to trace it down to one point where there is a leak. I would bet that you have a split or broken vacuum line in that area. Not an uncommon problem. If no vacuum leaks are found then I would start to suspect the MAF sensor.

Apr 01, 2010 | 1997 Lincoln Town Car

1 Answer

P0101 p0171 p0174 engine codes on gmc siera 3/4 ton 6.0l idle rough


Those are lean codes and a MAF (P0101) code. Make sure the MAF sensor is plugged in, and there are no leaks/ loose hoses between the air filter and the engine. You may have a vac leak at the intake also, but check these first, If all appears OK a repair shop will need to check it out for you.

Dec 16, 2009 | 2003 GMC Sierra 2500HD

9 Answers

1995 ford escort idle problem


Hi , i have a 1995 Escort with 1.9 4 cyl engine , at cold start the engine revs ok but as it get warmer it start to idle rought and die , with a scantool the o2 sensor always reed lean at idle , after checking fuel pressure , air mass meter , EGR valve , and potential vacuum leak at intake and hoses , its the PCV valve that give me that problem , as i remove the pipe with the valve there was a whissle noise comming from it , when i block the valve at its tip the whissle noise stop the engine revs smooter and the o2 reads normal , i replace the PCV and its idling good .

May 31, 2008 | 1995 Ford Escort

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