Question about 2007 Pontiac Grand Prix GXP Sedan

1 Answer

5.3 engine misfiring

How do I check the fire going to plugs without any fancy tools...just replaced all coils and it is worse....maybe I finished off one of the spark plug wires changing them?...was having intermittent hesitating in cruise power going down road

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  • Expert
  • 145 Answers

Harbor freight sells cheap inline spark checker, good for checking wires/spark visually

Posted on Dec 25, 2013

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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dustyboner
  • 331 Answers

SOURCE: 2000 Pontiac Grand AM trouble code P0300

Im surprised that didn't fix it. On the Quad4 engine its usually a cracked coil housing.
Have you checked:

  • fuel injectors / fuel pressure
  • coolant temp sensor
  • compression - to check for bad head gasket
  • ignition control module
  • EGR system - make sure the valve isn't stuck
  • crank position sensor.
The crankshaft position system variation compensating values are stored in the PCM non-volatile memory after a learn procedure has been performed. If the actual crankshaft position system variation is not within the crankshaft position system variation compensating values stored in the PCM, DTC P0300 may set.

Posted on Oct 15, 2008

  • 1 Answer

SOURCE: I am getting a misfire

Here is a copy of the "Policy Adjustment" that I took to the dealer with me this morning. Hope this helps any of you.

----------
Subject: Special Policy Adjustment - Catalytic Converter #05551 -(09/14/2005)
Models: 2001-02 CHEVROLET IMPALA, MONTE CARLO
2001-02 PONTIAC GRAND PRIX
2001-02 BUICK REGAL
EQUIPPED WITH 3.4L (RPO LA1 - VIN E) OR 3.8L (RPO L36 - VIN K) V6 ENGINE
----------
Condition
Some customers of 2001-02 Chevrolet Impala, Monte Carlo; Pontiac Grand Prix; and Buick Regal model vehicles, equipped with a 3.4L (RPO LA1 - VIN E) or 3.8L (RPO L36 - VIN K) V6 engine, may experience a condition where the vehicle exhaust catalytic converter is replaced due to complaints of lack of power or illumination of the Malfunction Indicator Lamp (MIL). This may be due to the front endcone insulation from the catalytic converter breaking away and blocking the front of the first catalyst brick and preventing the free flow of exhaust gas through the converter.
Special Policy Adjustment
This special policy covers the condition described above for a period of 10 years or 120,000 miles (190,000 km), whichever occurs first, from the date the vehicle was originally placed in service, regardless of ownership. The repairs will be made at no charge to the customer.
For vehicles covered by Vehicle Service Contracts, all eligible claims with repair orders on or after September 15, 2005 are covered by this special policy and must be submitted using the labor operation codes provided with this bulletin. Claims with repair orders prior to September 15, 2005 must be submitted to the Service Contract provider.
Vehicles Involved
Involved are all 2001-02 Chevrolet Impala, Monte Carlo; Pontiac Grand Prix; Buick Regal model vehicles, equipped with a 3.4L (RPO LA1 - VIN E) or 3.8L (RPO L36 - VIN K) V6 engine and built within the following VIN breakpoints:
Year
Division
Model
From
Through
2201
Chevrolet
Impala
19100001
19378250
2001
Chevrolet
Monte Carlo
19100001
19378233
2001
Pontiac
Grand Prix
1F100004
1F275188
2001
Buick
Regal
11100004
11338085
2002
Chevrolet
Impala
29100001
29374833
2002
Chevrolet
Monte Carlo
29100016
29374832
2002
Pontiac
Grand Prix
2F100019
2F276927
2002
Buick
Regal
21100001
21288762
Parts Information
Parts required to complete this special policy are to be obtained from General Motors Service Parts Operations (GMSPO).
Part Number
Description
Qty/ Vehicle
10343187
Converter, Catalytic (L36 engine)
1
10343185
Converter, Catalytic (LA1 engine)
1
10328740
Gasket, Catalytic Converter (Converter to I-Pipe, both)
1
15286606
Gasket, Exh Manif Pipe (L36)
1
24505057
Gasket, Exh Manif Pip (LA1)
1
Customer Notification
General Motors will notify customers of this special policy on their vehicles (see copy of typical customer letter included with this bulletin - actual divisional letter may vary slightly).
Service Procedure
Catalytic Converter Inspection
Begin the inspection by reviewing the condition described by the customer. Refer to "Description and Operation," SI document 657895, to help you determine the correct symptom diagnostic procedure when a malfunction exists.

Posted on Feb 08, 2009

seanpwright
  • 2030 Answers

SOURCE: My 2001 Grand Am is randomly misfiring. Have

Has the ECM been checked, and all the igniotion connectors.

Have the fuel injectors checked you may have a bad one or two, or possibly bad gas, or a low fuel pressure problem.

Posted on Nov 09, 2009

  • 110 Answers

SOURCE: i have a 99 grand am SE 2.4 4 cylinder and my

A misfire doesn't always have to be ignition... it's just the most common cause. Faulty or plugged injector, low compression. You need to check fuel pressure and test the fuel injector flow. Then check compression. If you don't have tools for these tests, take it to someone who does. Testing is much cheaper than throwing parts at the problem.

Posted on Feb 25, 2010

  • 238 Answers

SOURCE: 2001 Pontiac Montana - what is a misfire #5?

Without your actual trouble code, I am assuming that you are have a misfire on cylinder # 5. The computer cannot really tell what is causing the misfire only that cyl 5 is not putting out full power. If it misfires when cold then smooths out as it warms up, I would say it is probably an injector that is sticky, as it warms up it starts working properly.

Posted on Apr 29, 2010

Testimonial: "Thank you for your suggestion. I will have that checked out. I will also ask my mechanic what the actual trouble code says."

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Firing order coil pack 2000 ford explore 5-0


Firing Order is 1 3 7 2 6 5 4 8

JF: Integrated Ignition Coil On Plug Coil 1 Through 10 Failure

2000 PCED On Board Diagnostics II


SECTION 5: Pinpoint Tests




Procedure revision date: 01/31/2001










JF: Integrated Ignition Coil On Plug Coil 1 Through 10 Failure


? JF: Introduction




JF1 DETERMINE WHICH COIL IS NOT FIRING

    Note: Electronic ignition engine timing is entirely controlled by the PCM. Electronic ignition timing is NOT adjustable. Do not attempt to check base timing. You will receive false readings.

  • Determine which coil is not firing using information from Pinpoint Test JB or DTC and the table at the beginning of this pinpoint test.


  • Record cylinder, coil and PCM pin number from the table.


Have the cylinder number, coil driver and PCM pin number been recorded?







Yes


No






GO to JF2.


To obtain required information, GO to JF1 and REPEAT.




JF2 DTC P0351, P0356, P0357: CRANKSHAFT POSITION SENSOR FAILURE
Are any of the above listed DTCs present?







Yes


No






GO to JF3.


GO to JF4.




JF3 CHECK RESISTANCE OF CRANKSHAFT POSITION SENSOR


  • Measure resistance of crankshaft position sensor.


Is resistance between 290 and 390 ohms (for LS8 between 900 and 1300 ohms)?







Yes


No






GO to JF4.


REPLACE crankshaft position sensor. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).




JF4 CHECK FUNCTIONALITY OF SUSPECT COIL DRIVER (CD) CIRCUIT


  • Disconnect suspect coil (determined from the table).


  • Connect incandescent test lamp between IGN START/RUN and suspect CD circuit (determined from the table) at the coil on plug harness connector.


  • Disable fuel pump by disconnecting inertia fuel shutoff switch.


  • Observe incandescent test lamp while cranking engine.


Is the test lamp blinking consistently?







Yes


No






KEY OFF. GO to JF5.


KEY OFF. GO to JF6.




JF5 CHECK FUNCTIONALITY OF SUSPECT COIL


  • Remove suspect coil (determined from the table) from spark plug.


  • Connect an air gap spark tester 303-D037 (D81P-6666-A) or equivalent to a suspect coil.


  • Reconnect suspect coil harness connector.


  • Observe spark tester while cranking engine.


Is the spark present?







Yes


No






KEY OFF. INSPECT spark plug, REPLACE if necessary. GO to Z1.


KEY OFF. REPLACE coil. INSPECT spark plug, REPLACE if necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).




JF6 CHECK IGN START/RUN VOLTAGE TO SUSPECT COIL


  • Key on, engine off.


  • Measure voltage between IGN START/RUN circuit at the coil on plug harness connector and ground.


Is voltage greater than 10.0 volts?







Yes


No






KEY OFF. GO toJF7.


KEY OFF. LS6 and LS8: GO to B5.

All others: IGN START/RUN circuit fault. CHECK condition of related fuses/fuse links. If OK, REPAIR open circuit. If fuse/fuse link is damaged, CHECK IGN START/RUN circuit for short to ground. REPAIR as necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).




JF7 CHECK SUSPECT CD CIRCUIT FOR OPEN IN HARNESS


  • Disconnect PCM.


  • Measure resistance of suspect CD circuit between PCM harness connector pin (determined from the table) and coil on plug harness connector.


Is resistance less than 5 ohms?







Yes


No






GO to JF8.


REPAIR open circuit. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).




JF8 CHECK SUSPECT CD CIRCUIT FOR SHORT TO VPWR IN HARNESS


  • Key on, engine off.


  • Measure voltage between suspect CD circuit at the PCM harness connector (determined from the table) and ground.


Is voltage less than 1.0 volt?







Yes


No






KEY OFF. GO to JF9.


KEY OFF. REPAIR short circuit. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).




JF9 CHECK SUSPECT CD CIRCUIT FOR SHORT TO GROUND IN HARNESS


  • Disconnect scan tool.


  • Measure resistance between suspect CD circuit at the PCM harness connector (determined from the table) and ground.


Is resistance greater than 10,000 ohms?







Yes


No






GO toJF10.


REPAIR short circuit. If symptom or DTC is still present, GO to JF11 to check for damaged coil, otherwise COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).




JF10 PERFORM INTERMITTENT TEST ON SUSPECT CD CIRCUIT HARNESS


  • Connect digital multimeter between suspect CD circuit at the PCM harness connector (determined from the table) and CD circuit at coil on plug harness connector.


  • Wiggle and bend CD harness from PCM harness connector to coil on plug harness connector.


Did resistance fluctuate during wiggle test?







Yes


No






REPAIR intermittent fault in harness. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).


REPLACE PCM. (REFER to Section 2, Flash Electrically Erasable Programmable Read Only Memory (EEPROM)). If symptom or DTC is still present, GO to JF11 to check for damaged coil, otherwise COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).




JF11 CHECK SUSPECT COIL FOR DAMAGE


  • Remove suspect coil (determined from the table) from spark plug.


  • Connect an air gap spark tester 303-D037 (D81P-6666-A) or equivalent to a suspect coil.


  • Disable fuel pump by disconnecting inertia fuel shutoff switch.


  • Observe spark tester while cranking engine.


Is the spark present?







Yes


No






KEY OFF. INSPECT spark plug, REPLACE if necessary. GO to Z1.


KEY OFF. REPLACE coil. INSPECT spark plug, REPLACE if necessary. COMPLETE Misfire Monitor Repair Verification Drive Cycle (REFER to Section 2, Drive Cycles).

Feb 14, 2015 | 2000 Ford Explorer

1 Answer

2001 toyota sienna 3.0 V6 random missfiredorder on #1,3,5 cilinder, I start the engine and lift plug coils one at the a time and NO change in the engine, but cylinder #2,4,6 they do engine stalls normal,...


Are the coils more than 6 years old ?

Maybe you need to replace all of them or the
ones on the bank that have the misfires

Without professional tools all you can do is walk
one new coil at a time & then drive it,to see if it
clears up.

If you have a flashing MIL Lamp,that is a Class A
cylinder misfire & you do not want to test drive that
& ruin the converter

I suggest you do not remove the coils when the motor
is running,we are not back in the 1960's,you can ruin
things in the ignition system with the secondary open

Always use a tool to ground out your coils or plugs

Oct 06, 2014 | 2001 Toyota Sienna

2 Answers

Misfire and poor acceleration in kia sportage 1999


either you have a faulty gas pump, one or more spark plugs or cables ar going bad or nrrd to br replace, could be a vacuum leak too, yourcar have the check engine light on? if so, need to know what code the will help you a lot.

Nov 24, 2011 | 1999 Kia Sportage

2 Answers

I have an 02 Ford Ranger 4 cylinder 2.3ltr and it keeps just falling on its face,stutering,jerking,mis or back firing. And its get'n worse and worse. I got the code 1301 #1 cylinder misfiring so i put...


Sparkplugs are not the only cause for a misfire... there could be any number of things.
- The cause of misfire should be fairly easy to pinpoint if the problem is present all the time. A quick look at the spark plugs can tell a lot. Signs of arcing on ignition coil, distributor cap or rotor can also point to a faulty part. Basics, such as the compression, timing and fuel pressure need to be checked.
- A faulty on-plug ignition coil is typically identified by swapping the coils between the cylinders and checking if the misfire moved with the coil or stayed at the same cylinder. If a bad ignition coil is replaced, it's good idea to change all the spark plugs as well.
- The engine might need to be checked for vacuum leaks. The short term fuel trim (STFT) and long term fuel trim (LTFT) need to be checked with a scan tool to see if the air/fuel mixture is not too lean. Often a bad mass air flow sensor causes the engine to run lean causing misfire.
- Pressure testing of the cooling system might be needed to check for a leaking head gasket.
- Valve adjustment may need to be checked, as valves that are out of adjustment can cause misfiring at a cold start, which is, a fairly common issue in Honda engines.
- When the misfiring happens only at idle, the EGR valve and purge valve need to be checked, as either one could be stuck open.
- Faulty mechanical valve train components like worn camshaft lobes or stretched timing chain can also cause the engine to misfire; they too might need to be inspected carefully.
- Sometimes a broken or damaged tooth at the crankshaft or camshaft sensor gear can be the source of misfiring; checking the sensor signal with an oscilloscope can help if crankshaft position sensor or camshaft position sensor are suspected.

Oct 24, 2017 | 2002 Ford Ranger Regular Cab

3 Answers

My husband did a tune up on my car yesterday and now it wont start it will turn over like it wants to start but it wont he said that its miss firing we have bought 3 new coil packs and still will not start...


If your car is miss firing and your husband changed the coil packs,the wires leading from coil packs to sparkplugs must have got crossed.This will change car timing which will result in the car miss firing.He needs to go over wiring and correct problem for car to run right.You can go online to autozone.com and type in Info about car to get the correct wiring layout.Your problem isnt the new plugs n wires.Its the wiring layout.

Feb 09, 2011 | Pontiac Grand Am Cars & Trucks

1 Answer

Service engine soon light on; diagnostic code states: cylinder 7, Misfire


you need to have your engine tuned up, unless it's been done recently. misfire means it's not getting fire or fuel to #7 plug. you may have a plug wire bad or a bad spark plug on #7 if you go to effort of sending it to garage just to replace one plug or wire,you'll pay labor for whole tune up. wires,plugs, and maybe a bad coil pack. suggest you have tuned up with new plugs and wires. also while they are there, have them check fire to #7 plug on coil first before you do a complete tune up. thank you for choosing fixya.com

Dec 30, 2010 | 1999 Lincoln Town Car

2 Answers

Misfires. I have a 1998 Camry 2.2 with 200K miles. The


Hi, my first recommendation would be to take the plugs out and visually inspect each one and check to make sure they are properly gapped, if they look fouled at all i would replace them without hesitation. try throwing a set of NGK plugs in the car to fix the misfires. other than that you may want to look at the wires. good luck joe

May 22, 2010 | 1998 Toyota Camry

2 Answers

Engine seems to miss / sputter between 30 mph and 50 mph. Really noticeable when going uphill at any grade. 2005 ford expedition 5.4l


Hi Nascar2nd.
From what you are describing it appears like an engine misfire.
These trucks are notorious for bad ignition coils.
They don't always set a code either, it depends on several factors.
To check these out in my shop there is a mode in our scan tool called "mode 6". This allows us to look at certain engine data parameters to look at misfire to locate the offending cylinder(s).
Unfortunately without the use of a scan tool you will not be able to see this.
It may be in your best interests to get a shop to look at this for you and verify the bad cylinder.
I have had issues with aftermarket coils and use Ford originals exclusively now. They have also reduced the price of them, good thing too because we go through many.
Might be an opportune time to replace spark plugs as well. worn spark plugs can accelerate coil failure as a worn plug takes more energy to fire.
Thank you for using FixYa !

Dec 02, 2009 | 2003 Ford Expedition

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