Question about 2003 Mazda MPV

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How do you remove the bolts from the manifold to

I have a random misfire. How do I find out what the problem is?

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Check spark plug wires and coil packs

Posted on Sep 07, 2009

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How to check coil packs and spark plugs wire with a multimeter. ..having random/ multiple misfire P0300...need to know their spec? 97 Cadillac Deville, 4.6 engine/Northstar


I don't think you really understand what this fault code means, it means that likely all the engine cylinders are misfiring at random no set pattern, not any particular cylinder. I would start with checking for engine vacuum leaks like the intake manifold gasket. that is all I can say since you provided no make, model or year and engine type and size information.

Sep 21, 2016 | 1997 Cadillac DeVille

1 Answer

I took my 2001 civic to the mechanic to clean my egr ports because of the random misfire when he pulled the intake manifold there was oil in there can is this the problem caused by the rndm misfire


It could cause a random misfire but I can't imagine it's from the random misfire, the only way oil can get into the intake is from the pcv system, most likely the pcv valve. A little oil coating is normal but excessive amounts are usually due to the valve being stuck open

Jan 27, 2016 | Cars & Trucks

2 Answers

Random misfire


Have the fault codes read. Replace faulty items. Use only
genuine items as replacement as non-genuine are not always compatible with the OEM fitted CPU units. This results in the fault codes not cancelling out. Pay attention to ignition coils problem Wiring connectors.

May 19, 2013 | 2005 Mitsubishi Montero Limited

1 Answer

Multiple random misfire cylinder 3 misfire


Is the fuel reaching the cylinder, is there compression in that hole? Any intake manifold vacuum leaks?

Feb 13, 2013 | 2000 Dodge Neon

1 Answer

1997 Saturn EGR Check Engine Light


saturn had a lot of problems with the coil posts getting rusty that will cause the misfire on cylinder number 3 and any skip will cause the random misfire see as one coil fire two cylinders the egr sensor is built into the vavle and try stick closed from carbon build up cleaning it will only putoff replacing it if it operates at all

Jun 12, 2012 | Cars & Trucks

2 Answers

Heavy idle, random misfire code 04 trailblazer


I would start with the inlet manifold gasket, these are know to break down causing vacuum leaks which can cause this issue, also check around engine for other vacuum leaks

Mar 08, 2012 | Chevrolet Cars & Trucks

1 Answer

I have a code of PO300 random misfire the truck starts runs ruff then stalls. have just replaced the fuel filter.


Check for a vacuum leak all hoses and also check for leak in the intake manifold gaskets.This will cause a misfire and a code p0300

Apr 21, 2011 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

My 98 ford windstar is displaying trouble codes p1537/p1538, along with a misfire on cylinder 1 & 2 (p0301/p0302). what are some problems that can cause this problem?


Codes p1537 and p 1538 are codes for a faulty IMRC valve. They are located on the lower intake manifold.

Intake Manifold Runner Control (IMRC), Vacuum Control
  1. Remove E-clip retaining vacuum control linkage to lever/shaft assembly.
  1. Remove adjustment screw from the vacuum control (9S514) and bracket.
  1. Remove two bolts retaining vacuum control and bracket to IMRC housing assembly.
  1. Disconnect linkage from the lever/shaft assembly and remove vacuum control .
  1. To install vacuum control and bracket assembly, reverse Removal procedure. Tighten retaining bolts to 8-11 Nm (71-97 lb-in). Adjust vacuum control as described.


    Intake Manifold Runner Control (IMRC)


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As for the misfire codes, Check out the upper and lower intake gaskets. Since you have to take the upper intake off for the imrc valves its just a few more bolts to remove the lower intake. The intake gaskets are rubber seals. When the engine is cold the seals shrink and causes a misfire. when the engine warms up the seals expand and the misfire goes away.

Mar 07, 2011 | 1998 Ford Windstar

1 Answer

Loss of power, stalling at stops and slows, codes P0300, P0107, P0105 and P0105. Will stall but when put into nuetral will start right up.


The symptoms and the codes you've given would indicate to me that you have a vacuum leak. Look for a loose a throttle body, loose, missing or damaged hoses, loose or missing intake manifold bolts or any other opening in the intake manifold.
P0105 - Manifold Absolute Pressure/Barometric Pressure Circuit Malfunction
P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
P0300 - Random/Multiple Cylinder Misfire Detected

Jun 17, 2010 | 2001 Pontiac Grand Am SE

1 Answer

Code 301, random or cylinder 1 misfire


Spake pluge could have gone bad, or the Spark Plug wire. Try changing all your plugs and wire and inspect the old one's. The wire could be bad do to time or may have been against the exhaust manifold and brunt. Good luck

Apr 08, 2009 | 1997 Dodge Caravan

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