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5 an 6 cylinder misfires

Will a spark plug gap cause it an if so what is the gap spec so i can set them

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  • Cars & Trucks Master
  • 5,341 Answers

Check on the VECI label under the hood, vehicle emission control information, the long rectangular label. It shows tune-up specs and spark plug gaps. And yes, halphin, the wrong gap can cause a misfire, if too far off.

Posted on Jan 07, 2013

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Posted on Jan 02, 2017

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SOURCE: spark plug gap

.03-.035 inches

Posted on Sep 08, 2008

  • 196 Answers

SOURCE: Spark Plug gap settings.

Look on you're emissions tag under the hood they should be on there.

Posted on Jan 16, 2009

emissionwiz
  • 76691 Answers

SOURCE: Spark Plug Gap settings

ACDELCO Part # 41103
SPARK PLUG .043 GAP

Posted on Feb 23, 2009

  • 315 Answers

SOURCE: 1996 Jeep GC - Diagnostic tool identified cylinder misfire

P0300 Code - Random Misfire

Symptoms Symptoms may include:

  • the engine may be harder to start
  • the engine may stumble / stumble, and/or hesitate
  • other symptoms may also be present
Causes A code P0300 may mean that one or more of the following has happened:
  • Faulty spark plugs or wires
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector(s)
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Stuck/blocked EGR valve / passages
  • Faulty camshaft position sensor
  • Defective computer

Posted on Mar 05, 2009

michigan man
  • 3533 Answers

SOURCE: spark plug gap spec. for 1997 ford ranger/4.0 liter

for the most part it is under the hood of your car where the sticker say engine size try this website to see if they have you car listed its www.autozone.com if not call your local part store and tell them its a 4.0 liter and you need the gap on the spark plugs

Posted on Apr 20, 2009

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Code P306 on my Caravan 04, causes, fixes, please?


Misfire on cylinder six could be spark plug, spark plug wire, coil, or no compression in that cylinder. Check plug for gap, wire for burn or worn marks and for spark at coil. Compression tester will be needed to go on.

Jul 19, 2017 | Cars & Trucks

2 Answers

I have a misfiring problems with cylinders 1 and 6. Which ignition coil do i need to change?


Ignition coil one and six or course.The 3.7L uses separate ignition coils for each cylinder. The one-piece coil bolts directly to the cylinder head. Rubber boots seal the secondary terminal ends of the coils to the top of all 6 spark plugs. A separate electrical connector is used for each coil.
Because of coil design, spark plug cables (secondary cables) and a distributor are not used.
Two knock sensors (one for each cylinder bank) are used to help control spark knock.
The Auto Shutdown (ASD) relay provides battery voltage to each ignition coil.
The ignition system consists of:
² 6 Spark Plugs
² 6 Separate Ignition Coils
² 2 Knock Sensors
² Powertrain Control Module (PCM

Dec 10, 2016 | Jeep Cars & Trucks

1 Answer

What causes misfires?


If the misfire is on one a particular cylinder or perhaps 2, these issues need to be addressed and checked...
1. Power to the spark plug.
2. Coils and spark plug condition.
3. Fuel supply to the cylinder
4. Air supply to the cylinder
5. Correct fuel/ air mixture to the cylinder
6. Cylinder compression. Low compression or a cylinder compression level below spec will result in a misfire. If the compression tester shows low compression in a cylinder the causes of the poor compression reading then need to be addressed.

The fault codes generated by the computer and read by an appropriate scanner will tell you which cylinder or cylinders are misfiring.

Nov 14, 2015 | Cars & Trucks

1 Answer

WHEN I GIVE IT GAS IT START TO MISFIRE


Misfires are caused by one of 3 things-gas, spark, or compression-one of those is the problem. For gas, check the fuel pressure and see if it is at the right pressure for your car. Low fuel pressure will cause misfires. If pressure is good, it could still be an injector problem, like a clogged injector. If low pressure, suspect the fuel pump or the fuel filter.
For an ignition spark problem, check your spark plugs. Pull them out and inspect them for broken or cracked plugs, check the spark plug gap, check for oil fouled plugs. You may be able to isolate the misfire to a cylinder or two by the plugs condition. A misfiring plug or cylinder should show more black, sooty deposits than the other plugs. A normal firing plug will have a tan or brown colored insulator on the end with very little deposits. If the plugs are okay, clean them a bit if needed, and check for spark on the spark plug wire ends with engine cranking. Buy an inexpensive spark tester, or hold each spark plug wire metal end terminal 1/4 inch from a ground on the engine block, while cranking the engine. Wear a heavy glove to avoid getting shocked. Check that every cylinder is getting a strong blue spark to eliminate ignition as a problem. A weak, yellow or orange spark is an ignition problem, possibly a bad coil, or other ignition part.

If spark and gas is good, you may need to check engine compression. Any cylinder that has significantly lower compression than the other cylinders will cause a misfire, and set a misfire code. You should check for any trouble codes in the engine computer. A code reader or scanner would have to be connected to the diagnostic connector under the dash. What is "significantly lower" compression? About 15-20% less compression. Say you checked and had 150 psi compression in most cylinders. If one had 20% lower compression ( 150 X 20%= 30 psi, 150 -30 =120 psi, or same as saying 150 X 80%= 120 psi.), a condition like that can cause a misfire. I hope I have made sense here. Good luck, and post back what you find, or if any questions.

Apr 10, 2014 | 1998 Ford Windstar

2 Answers

I have a 1999 Silverado 1500 2WD, it misfires @ 2nd and 3rd shift point until it reaches 210 degrees then the misfiring completely goes away. I have given it a complete tune up. Any ideas??


joking they all do/ really,! but yours is outside normal.

the OBD2 DTC codes clear, no P0300s at all, or the like?

cold misfire.
new spark plugs , using OEM type plugs and gapped to factory spec. not to Autozoned spec. they lie.

misfire can be many reasons
even a leaking EGR main valve.
1: low compression any cylinder. (compression gauge)
2: bad spark (look for OBD2 pending P030x)
3: bad fueling, (injector balance tests)

there are tests for each , all are simple.
injector clogged or leaking?

is the fuel old?
try techron fuel additive, (i hate additives) but this one is just
more benzine that is already in all chevron fuel. so is 100% safe.
run that, read bottle for rates.
the misfire is real, it can be found.
the first question, is it all 8 cylinders or just 1.
we can do a spark shunt test to find cylinders that are dead
during the misfire.

Oct 08, 2013 | 1999 Chevrolet Silverado 1500

1 Answer

Cylinder number 5 misfire, what is the cause? connected obd II and detected number 5 cylinder misfire?


I'm assuming the code that was pulled is P0305. Best case would be a bad spark plug on the number 5 cylinder. Keep in mind, the spark plugs are torque sensitive when installing. These are the possible causes that are stated in a Jeep service manual for your vehicle. Check the basics first......Camshaft,crankshaft,valve timing or vacuum problem,ignition coil output is low,engine internal mechanical problem,secondary ignition pattern is irregular, fuel contamination, Fuel pressure leak down is out of spec, fuel pump ampere out of spec, fuel pump capacity out of spec, fuel pressure is out of spec., engine compression, PVC system restriction, Fuel injector #5 is defective or the connection on the injector itself is loose or corroded, Intake gasket defective. It could also be freeze frame data in the PCM, but this is a very very rare cause.

Mar 15, 2011 | 2000 Jeep Cherokee

2 Answers

Hello I have a1997 xk8 runs great but my check eng. light came on and the code that it read was a misfire code were do I start troubleshooting.


If it was a specific misfire code go to that cylinder and check the following: plug, wire, and coil, if it is a random misfire code, start by checking your spark plugs(including the gap), plug wires, and coil packs.

Sep 24, 2010 | 1997 Jaguar XK8

1 Answer

Cylinder 3 misfire


Misfire codes (including P0301, P0302, P0303, P0304, P0305, P0306, P0307 & P0308) indicate that there is a misfire in a cylinder, the last number indicates which cylinder has the problem. If something is causing a miss in random cylinders or is affecting all of them, a P0300 misfire code will be stored in the car's computer. It's always smart to begin with the basics. Also consider the mileage and service history when diagnosing a misfire. Higher mile vehicles are more inclined to have mechanical issues with the engines, like low compression from worn valves or rings etc. Any accompanying codes should also be considered in case they may be related. If the spark plugs are worn (excessive gap) or the car is past due for a tune up, it may be smart to go ahead and start with spark plugs and spark plug wires and go from there.
The 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 (if eqipped)
  7. Vacuum leak or stuck open EGR
  8. Contaminated fuel or bad fuel pump
  9. Weak compression
  10. Blown head gasket

May 30, 2010 | 2004 Dodge Ram 1500

3 Answers

Misfire code#306


cylinder #6 is misfiring check plug(if gap incorrect can cause misfire, fouled etc) , coil on plug (or Wires) poss spark plug coil pack (check for cracks and heat damage in insulation of pack)

Oct 20, 2009 | 1996 Ford F150 Regular Cab

1 Answer

Replaced spark plug in VW polo, warning lights is on...


are the plugs gapped to spec this could cause misfires whick would set off the engine light make sure your plug wires are good and not split for this to may cuase misfires cause the wire is grounding out on the head or the manifold

Aug 23, 2009 | 2002 Volkswagen Golf

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