Question about 2000 Cadillac Escalade

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2000 Cadillac Escalade replaced all o2 sensor total 4 sparg plugs maf. Code says multiple misfire. Truck idles an runs rough

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  • 158 Answers

Could be the spark plug wires.

Posted on Apr 13, 2015

6 Suggested Answers

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Posted on Jan 02, 2017

wireguy212
  • 1627 Answers

SOURCE: how do i fix my 2001 cadillac catera idle problem

The problems you are describing indicate to me that you likely need to replace the coil pack that runs from the spark plugs ,and the plug wires end up at it.It also may be the spark plug wires,get a water bottle and spray the wires after dark and if you get a light show from them then replace them,if not,replace the coil pack.

Posted on Jul 15, 2010

  • 135 Answers

SOURCE: 2002 cadillac escalade ext misfire, shifting problems,

change spark plugs,check for valcum leaks. multiple misfire is spark plugs,coil or wires

Posted on May 19, 2009

Keef2011
  • 160 Answers

SOURCE: 2003 2500hd rough idle and

Sounds like a defective knock sensor. These bring on multiple misfire codes with little change to performance. Check your oil level too, this can make knock detection codes come on unnecessarily. Hope this helped...

Posted on Mar 08, 2011

emissionwiz
  • 75822 Answers

SOURCE: Down to the final OB code on my truck...Po174

P0174 FORD - Fuel Injection System Too lean Bank 2xicon.jpghttp://engine-codes.com/p0174_ford.htmlForum CodePossible causes- Intake air leaks
- Faulty front heated oxygen sensor
- Ignition misfiring
- Faulty fuel injectors
- Exhaust gas leaks
- Incorrect fuel pressure
- Lack of fuel
- Faulty Mass Air Flow (MAF) sensor
- Incorrect Positive Crankcase Ventilation (PCV) hose connection Tech notes The codes is usually set when there is an intake leak after the air flow meter, before replacing any parts check for loose or broken hoses and intake gasket leak. On Ford some models dirty air filter, and dirty or faulty air flow sensor are the cause of the problem.

It's a very common problem for the Ford Windstar. Here a link to a web site with information how to repair:
When is the code detected?- Fuel injection system does not operate properly.
- The amount of mixture ratio compensation is too small. (The mixture ratio is too lean.) Symptoms- Engine Light ON (or Service Engine Soon Warning Light)
- Excessive Fuel ConsumptionP0174 FORD Description The Powertrain Control Module (PCM) monitors the engine Air/Fuel mixture ratio, the actual mixture ratio can be brought closely to the theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensors 1. The PCM calculates the necessary compensation to correct the offset between the actual and the theoretical ratios.

In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the PCM judges the condition as the fuel injection system malfunction and light up the engine light.

Posted on Oct 08, 2012

SOURCE: what causes 2000 taurus engine rough idle but no codes

I had a head gasket going when I have a rough idle. Just weeping coolant past the number 1 cylinder. When I pulled the head the piston was all shiny and steam cleaned. $500 dollars all good now.

Posted on Nov 04, 2013

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possibly the TPS....also check it for vaccum leaks

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When checking for Vacuum leaks, did you use a water spray bottle on seams and vacuum lines and EGR pod?(engine running)

Check for air leaks in exhaust before O2 sensors. O2 thinks its running lean from air leak in exhaust header and enrichens fuel charge.

Fuel injectors dirty, not closing tight. Switch injectors to other bank and see if Error Code moves to relocated injectors.

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PO174 &171- Both banks lean. This could be caused by a defective MAF or O2 sensor but something as simple as a vacuum leak could cause this problem. Also make sure there are no air leaks from the MAF sensor to the intake manifold. I have repaired many vehicles with these codes that was caused by a vacuum leak. Hope this helps

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I have a 2000 Cadillac Deville with 180k miles. I've been getting P0171 and a P0174 code. Yet there is no vacuum leaks. I replaced the MAF and still its idles rough once it heats up. Any suggestions?


Have you not Googled the Codes PO171 & PO174
to learn the problem ?

I would suspect you never changed the front O2 Sensors
at 100,000 miles & they both have now failed

The MAF shouldn't have been the issue

You may also have converters that are worn out
with a 14 year old vehicle

Are you changing Spark Plugs every 3 years ?

A rich fuel issue will drive the O2 lean also
Need to look at Fuel Trim on scan tool & other data

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How do i fix my 2001 cadillac catera idle problem. ive tried fuel injector cleaner, changed the spark plugs, and o2 sensors, but it still idles rough and im throwing these codes. bad o2 sensor bank 1...


The problems you are describing indicate to me that you likely need to replace the coil pack that runs from the spark plugs ,and the plug wires end up at it.It also may be the spark plug wires,get a water bottle and spray the wires after dark and if you get a light show from them then replace them,if not,replace the coil pack.

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2000 Toyota Tundra 4.7L V8 Rough Idle


Clean/Inspect Intake, MAF sensor, IAC valve for proper operation. Also check for vacuum leaks within the air intake hose and intake components. Hopefully this helps

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1 Answer

2002 cadillac escalade ext misfire, shifting problems,


change spark plugs,check for valcum leaks. multiple misfire is spark plugs,coil or wires

Jan 04, 2009 | 2002 Cadillac Escalade Ext

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