Question about 2003 Suzuki Vitara

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Hi my spark plugs keep fouling up and making my 1998 v6 petrol run rough iv'e check all coils and are fine, injectors are all fine, no head gasket problems. smokes when first started then clears. rings should all be fine as its only done 52000 mls and there's no pressure from oil filler cap. cat has been done. please can anyone help or say if they have had a simular problem???

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If your plugs foul most likely you are having a problem with the fuel air mixture and that is causing them to fail. Check your IAC Idle Air Control valve and make sure that your air filter and everything is clean

Posted on Feb 19, 2009

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Hi,i have a 2005 4lt v6 4x4 courier petrol was running fine started missing changed spark plugs crank sensor cam sensor coil pack computer still not running properly only running on 4 cylinders.


you have changed all the electronics but that is half the problem
misfires are from low fuel pressure , faulty injectors/tips , wiring to the injectors and ECM

May 11, 2016 | Cars & Trucks

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1998 bmw 540i having a misfire on cylinder 5 changed the plugs and coil packs. It ran fine for a couple days, then it began again, giving me a check engine, and it's idling rough at low rpms.


Is the same cylinder causing the problem? If so take a close look at the spark plug for fuel fouling. The cylinder may be over fueled causing plug fouling. You may also have a bad coil or defective spark plug. Try swapping coil and plug with one from adjacent cylinder to see if misfire changes to that cylinder

Apr 06, 2015 | BMW Cars & Trucks

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My audi start but rough idel, excessive black smoke and no revolution, cause?


petrol or diesel if petrol check plugs coil packs and leeds if diesel cloged injectors water in tank (change filter ) sticking valves timeing wrong head gasket could be a number of things but get the first couple checked first hope this helps ivan

Oct 08, 2012 | Audi 5000 Cars & Trucks

1 Answer

Spark jumping from coil pack


Hi there:
Misfire is a common driveability problem that may or may not be easy to diagnose, depending on the cause. A misfiring cylinder in a four-cylinder engine is, pardon the pun, hard to miss. The loss of 25 percent of the engine power output is the equivalent of a horse trying to run on three legs. The engine may shake so badly at idle that it causes vibrations that can be felt in the steering wheel and throughout the vehicle.


Basically, it's one of three things: loss of spark; the air/fuel mixture is too far out of balance to ignite; or loss of compression. Loss of spark includes anything that prevents coil voltage from jumping the electrode gap at the end of the spark plug. Causes include worn, fouled or damaged spark plugs, bad spark plug wires or even a cracked distributor cap. A weak coil or excessive rotor gas inside a distributor would affect all cylinders, not just a single cylinder.

Lean misfire can occur when the air/fuel mixture is too lean (not enough gasoline in the mixture) to burn. This can be caused by a dirty, clogged or inoperative fuel injector; air leaks; or low fuel pressure because of a weak pump, restricted filter or leaky pressure regulator. Low fuel pressure would affect all cylinders rather than an individual cylinder, as would most air leaks. A leaky EGR valve can also have the same effect as an air leak. In fact, if a vehicle has one or more misfire codes and a P0401 EGR code, the fault is likely carbon buildup under the EGR valve.

Loss of compression means the cylinder loses most of its air/fuel mixture before it can be ignited. The most likely causes here are a leaky (burned) exhaust valve or a blown head gasket. If two adjacent cylinders are misfiring, it's likely the head gasket between them has failed. Also, if an engine is overheating or losing coolant, it's likely the head gasket is the culprit.

Intermittent misfires are the worst kind to diagnose because the misfire comes and goes depending on engine load or operating conditions. They seem to occur for no apparent reason. The engine may only misfire and run rough when cold but then smooth out as it warms up. Or, it may start and idle fine but then misfire or hesitate when it comes under load. Also, it may run fine most of the time but suddenly misfire or cut out for no apparent reason.

Hope this helps; also keep in mind that your feedback is important and I`ll appreciate your time and consideration if you leave some testimonial comment about this answer.

Thank you for using FixYa, have a nice day.

Jun 18, 2012 | 1998 Ford Mustang

1 Answer

My 98 exployer is misfiring on all 6 cycdeers but runs fine after warmed up


Misfires across all 6 cylinders could indicate the following:

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Priority Action Part Type Cause 1 Inspect Wireset Worn, Damaged or Faulty Spark Plug Wire(s). 2 Inspect Distributor Cap Loose, Burned or Cracked Distributor Cap. 3 Inspect Distributor Cap and Rotor Kit Loose, Burned or Cracked Distributor Cap and Rotor. 6 Inspect Spark Plug Fouled, Damaged, Broken, or Incorrectly Gapped Spark Plug(s). 7 Inspect Coil - Ignition Faulty Ignition Coil. 8 Inspect Condenser-Ignition Faulty Condenser-Ignition. 9 Inspect Point Set Burned, Worn or Incorrectly Set Ignition Points. 15 Inspect Timing Specification Incorrect Ignition Timing. 19 Inspect Fuel Injector Dirty or Worn Fuel Injectors. 21 Inspect Intake Manifold Gasket Leaking, Worn, or Damaged Intake Manifold Gasket. 22 Inspect Distributor Worn, Damaged or Faulty Distributor. 24 Inspect Valve Burned, Worn, or Sticking Exhaust Valves.

Nov 03, 2010 | 1998 Ford Explorer

2 Answers

Have a misfire on cylinder 3


Hello
Here is what to check let me know if you need help checking this out
most common misfire causes on the cars I've worked on have been:
  1. Spark plugs
  2. Spark plug wires
  3. Ignition coil
  4. Fuel injector
  5. Wiring to fuel injector
  6. Timing Belt
  7. Vacuum leak or stuck open EGR
  8. Contaminated fuel or bad fuel pump
  9. Weak compression
  10. Blown head gasket

Jul 14, 2010 | 1998 Dodge Durango

1 Answer

I have a 97 plym grand voy. 3.3 v6, it has new ignition coil, new spark plug, new crank shaft sensor, new camshaft sensor, but it missfire the cilinder n3 and n6, check the wires from the pcm to the ign....


Not likely. With 3 cylingers out, it would not run. When you have one coil, and spark different at any plug, it has to be wires. Not unusual to have 2 bad wires. Switch with one thought to be good before buying anything. Check the voltage at suspect injector, with test light. Should flicker. If flickers, swap injector with one thought to be good. Buy only parts known to be bad by comparison.

Jan 16, 2010 | 1997 Plymouth Voyager

2 Answers

Runs rough and keeps fouling out new spark plugs


sounds like too rich of a mixture check for vacuum leaks and check fuel press regulator

Apr 23, 2009 | 1996 Mazda Millenia

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