Question about 2004 Pontiac Grand Prix

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I have a 2004 Grand Prix and the exhaust valve spring was broke on cylinder #5 and I replaced it and the motor is still running rough. Any idea what might be wrong

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  • Randy Ault Nov 15, 2010

    Plugs and wires are new

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Have misfire, code P0316, any ideals? 86,000 miles on


2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
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Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
SERVICE PROCEDURE FOR VEHICLES WITH RUNS ROUGH/MISFIRE CONDITION:
1. Perform relative compression check on all cylinders. If abnormal, check cylinder leakage and actual compression for "low" cylinders refer to Workshop Manual (WSM), Section 303-00.
2. If leakage/compression check indicates a valve train concern, per valve train diagnostics in WSM, Section 303-00, replace cylinder head and cam assembly, pipe plugs and timing chain tensioner, per procedure outlined in WSM, Section 303-01.
3. If cylinder leakage and compression tests are inconclusive, perform misfire diagnostic, per TSB 05-22-8.

So

Feb 26, 2011 | 2004 Ford Freestar

1 Answer

Which spark plug is #5 on a 2004 Pontiac Grand Prix?


#5 cylinder is the last cylinder at the back of the engine ( the one closet to the trans. )

cylinders at the front of the engine are from front to rear are #2 #4 #6 cylinders at the back of the engine closest to firewall are from front to rear #1 #3 #5 ..........Hope this helps

Dec 10, 2010 | 2004 Pontiac Grand Prix

1 Answer

2004 Grand Pix starting running rough all of the sudden. I tuned it up and replaced the engnition module and it still running rough any suggestions?


Electronic Engine Controls WARNING
To avoid personal injury and/or vehicle damage, refer to the service precautions at the beginning of this section.
General Information The Engine Management System (EMS) uses several different sensors and actuators to gather and control various emissions and driveability aspects of the vehicle. These may include but are not limited to:
  • MAP - Manifold Absolute Pressure Sensor
  • BARO - Barometric Pressure Sensor
  • FTP - Fuel Tank Pressure Sensor
  • ECT - Engine Coolant Temperature Sensor
  • A/F - Air Fuel Ratio Sensor
  • APP - Accelerator Pedal Position Sensor
  • CKP - Crankshaft Position Sensor
  • CMP - Camshaft Position Sensor
  • EGR Valve Position - Exhaust Gas Recirculation Valve Position Sensor
  • HO 2S - Heated Oxygen Sensor
  • IAC - Idle Air Control Valve
  • IAT - Intake Air Temperature Sensor
  • KS - Knock Sensor
  • MAF - Mass Air Flow Sensor
  • TP - Throttle Position Sensor
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Are there any codes that point to a problem with any of the above sensors?

Nov 08, 2010 | 2004 Pontiac Grand Prix

2 Answers

2004 Jeep Grand Cherokee (63,000 mi - V8) Check engine light indicates #1 cylinder misfiring. Spent $$ getting system flushed for carbon residue. Drove 3 weeks, started up, ran rough, and light came on...


The miss,does not just come and go,if it is a engine valve,replace the coil and boot,go from there,if this does not solve the problem,then the injector is gone out,or going out.If it is a engine valve,the miss would never get better,then worse,it would be the same all the time,get him to run a air compression test,get the valves up(close)and see if any air is detected threw the exhaust,or the intake,it will be present if the valve is the problem.

Apr 24, 2010 | 2004 Jeep Grand Cherokee

2 Answers

WHERE IS O2 SENSOR BANK 1 01 GRAND PRIX 3.8 ENGINE


Standing in front of the car looking at the engine bank 1 is the cylinders on the front of the engine. These are cylinders 1-3-5. On the rear is bank 2 cylinders 2-4-6. The O2 sensor is located screwed into the exhaust manifold or the exhaust pipe on the front of the engine.

Oct 09, 2009 | 2001 Pontiac Grand Prix

1 Answer

Four cylinder feels like it is only hitting on three


you may have sticking valve or a weak or broken valve spring sometimes an exhaust valve rotator , it maybe that the # 1 cylinder exhaust valve is slightly bent and when it rotates to a certain spot it hangs slightly... requires inspection for confirmation, due a compression test or a cylinder leakdown % test...

Aug 12, 2009 | 1996 GMC Sonoma

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