Question about 1998 Mercury Grand Marquis

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Engine runs rough

Took to have put on computer it said that (2) cylinder banks are lean.
#4 and #2, recently had to replace the intake, might have a connection problem, any suggestions and what is the firing order on the V8 to know which bank. thanks in advance glenn @ TTurner474@aol.com

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Bank 2 is on driver side and bank1 on passenger side. you need to check all vacum lines if you have a lean code. in other words check all vacum hoses for leaks.

Posted on Feb 20, 2009

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2003 Ford Expedition XLT 4X4 4.6L. 70,000 miles. Had a rough idle then stalled. Happened 4 times today. CEL reports a lean left bank. Just finished changing spark plugs and fuel filter. Plugs were fine....


Cam Phasers. There is an Extended Warranty for them. What happens is the Cam Phaser is suppose to automatically adjust each cylinder bank independently. When one of the Cam Phasers gums up, it can leave a Cam over-advanced.

An over-advanced Cam will be lean and generate a lean Code for that side of the engine. An engine with one bank operating at 1 timing setting and the 2nd bank operating at a different setting will run rough and stall before blowing up.

Ford has given a 7 Year, Limited mile Extended Warranty for those DOHC engines having this problem. This can be a costly repair of around $2400. A recently developed "Cheater Procedure" can cut Labor from 8 to 4 hours with savings in gaskets resulting in a $1200 to $1600 repair.

Your vehicle may develop a Diesel sound which fades at 2000RPM. So contact a Dealer with a VIN# and go from there.

Jun 19, 2011 | Ford Expedition Cars & Trucks

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Rough engine idle and Lean DTC codes caused by split air intake


Check the 5" wide rubber air intake hose at the convolutes for splits that allow unmetered air into the engine. When this happens, the MAF sensor does not know this air is flowing into the engine, so it leans out the mixture generating DTC codes for Lean, Bank 1 & Bank 2.<br /><br />Use duct tape for a temporary fix and buy a new air intak hose. This hose runs from air cleaner box to engine throttle body.

on Oct 30, 2010 | Mazda MAZDA6 Cars & Trucks

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Rough idle vibrates and po171 code service engine soon. jamesrowland9@aol.com


Hi, a Ford P0171 is a LEAN code for cylinder bank 1, and P0174 is a LEAN code for cylinder bank 2. These codes commonly occur on many Ford vehicles, and are set when the powertrain control module (PCM) sees the air/fuel mixture is running too lean (too much air, not enough fuel).
When the Check Engine Light comes on, either one of these codes, or both, may be found when a code reader or scan tool is plugged into the vehicle diagnostic connector. IF the vehicle is driven long enough, typically both codes will be set.
A P0171 lean code for bank 1 is the cylinder bank on the RIGHT (passenger) side of the engine on Ford vehicles with a V6 or V8 engine and rear-wheel drive.


A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance.
Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Mar 24, 2011 | Ford Escort Cars & Trucks

2 Answers

Po174


A P0174 lean code for bank 2 is the cylinder bank on the LEFT (driver) side of the engine on Ford vehicles with a transverse-mounted V6 engine and front-wheel drive. This code is not set on four cylinder engines (no bank 2).
WHAT A LEAN CODE MEANS
A lean fuel condition may exist if the engine is sucking in too much air and/or the fuel system is not delivering enough fuel. If bad enough, a lean fuel condition may cause lean misfire, a rough idle, hesitation or stumble when accelerating, and/or poor engine performance . Unmetered air can enter the engine through a vacuum leak, a dirty airflow sensor that is not reading airflow accurately, an EGR valve is not closing and is leaking exhaust into the intake manifold, an EGR valve that is allowing too much flow (because the EGR differential pressure sensor that monitors EGR flow is faulty and is under-reporting EGR flow).
If the problem is not enough fuel, the underling cause may be a weak fuel pump, restricted fuel filter, leaky fuel pressure regulator or dirty fuel injectors.

Dec 24, 2010 | Ford Explorer Cars & Trucks

2 Answers

Check engine light flashing runs rough not firing on all cylinder2000 lincoln navigator with large triton engine Hooked up diagnnostic and it said 1. system too lean bank #2 2. Unable to bleed up fuel tank...


you may try your rotor button and distributor cap. and spark plug wires. try your map sensor also they tend to cause a lot of misfiring if they go bad.hope this helps.

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Check engine light flashing runs rough not firing on all cylinder


take of the fuel filter and blow it out. i had the same problem with a 2008 ford f150 5.4 v8.

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I have a 2003 gmc yukon 5.3 the engine idles rough sometimes the idle will get so low the engine will shut off.(the engine runs good while driving) hooked to scaner po101 maf/vaf (dont know what vaf is),...


you have a vacume leak somewhere.check all of your vacume hoses for leaks.Injector seals can cause this too.Also intake gaskets could be leaking.Running to lean usually means the car is getting to much air coming in.To check leaks spray brake cleaner around the hoses and the bottom of your intake if the rpms change then you found a leak.

Feb 21, 2010 | 2003 GMC Yukon XL

1 Answer

Error codes appeared on 2003 GMC Yukon PO170 too lean bank 1 PO174 tool lean bank 2 PO300 multiple cylinder misfire Still runs OK, idles a bit rough.


Check the intake manifold gaskets for leakage. It will tend to run rougher in the morning when it is cold. Check for vacuum leaks on any hose connected to the intake plenum too.

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2001 MPV Runs Rough at Idle and Low end Throttle


This could be a bad fuel injector. Lean implies low fuel to the cylinder which will cause a misfire.

Feb 01, 2009 | 2002 Mazda MPV

1 Answer

3.9 v6 4x4 check engine light, runs rough


Replace the ECT sensor.
And letme know. If you feel any diference. ok.

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