Question about 2004 Chevrolet Silverado

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Engine odd side black carbon even side burning good???

Changed number one coil pack, spark plugs, wires. lose of power, black out exhaust when stomped on ??

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My first thought is a skewed O2 sensor on that side. Have the truck scanned and look at the O2 values.

Posted on Mar 19, 2014

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What are codes p1401 p0302 p0305 p1409 p0301


P1401 Differential Press Feedback EGR Circuit High Input
Your EGR port is plugged. Replace your EGR valve, and clean the ports
A code P0302 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer
  • A code P0305 may mean that one or more of the following has happened:
    • Faulty spark plug or wire
    • Faulty coil (pack)
    • Faulty oxygen sensor(s)
    • Faulty fuel injector
    • Burned exhaust valve
    • Faulty catalytic converter(s)
    • Running out of fuel
    • Poor compression
    • Defective computer
    • A code P0301 may mean that one or more of the following has happened:
      • Faulty spark plug or wire
      • Faulty coil (pack)
      • Faulty oxygen sensor(s)
      • Faulty fuel injector
      • Burned exhaust valve
      • Faulty catalytic converter(s)
      • Running out of fuel
      • Poor compression
      • Defective computer
      • A code P0302 may mean that one or more of the following has happened:
        • Faulty spark plug or wire
        • Faulty coil (pack)
        • Faulty oxygen sensor(s)
        • Faulty fuel injector
        • Burned exhaust valve
        • Faulty catalytic converter(s)
        • Running out of fuel
        • Poor compression
        • Defective computer
        • p1409
        • EGR Vacuum System Leak - Read Our Article on EGR Valve Codes For Help With This Oldsmobile Check Engine Light Code

Sep 25, 2014 | Cars & Trucks

2 Answers

Jeep 3.7 cylenders 2 & 4 not firing


3.7 V6, mileage?

most likely the HV wires bad.

then bad coil pack.

did you check spark directly at the coil pack?

i use 2 known good HV wires to do that and 2 good test spark plugs.

both plugs grounded to engine (shell)

that is how you test any wasted spark coil pack. 3 coil pack.

if that fails the FSM shows, unplugging it and check the coil resistances. if wrong the pack is bad,

keep in mind the res. can read ok and coil be bad ,due to internal insulation break down (internal shorts)

if thats ok. the resistance , make sure the wires are not (primary)

to the coil (the low voltage connnector)

if that is ok, its mostly likely a bad coil, (pray not bad PCM)

if tool-less? start with cheap parts , work to expensive. (guessing)





now wasted spark 101.

if one line opens , both spark plugs die. no spark

the wasted spark is wired in SERIES. ( like Christmas lights)

the magic cuts cost of 6 coil\'s.

so if the HV wires are say, cheap , carbon wire and open

you lose, both spark plugs. use MAG wire and end this issues.

get some nice NGK mag wire or Bosch Mag wires.

you can see i hate carbon wire. for good causes.

(carbon string wire)

mag wires is real wire that is coil spun and is inductive. it

has the correct impedance but is not a resistor its and inductor.

and lasts the longest , and worth every penny.

Mar 29, 2014 | 2006 Jeep Liberty

1 Answer

Spark plugs all black carbon on odd side even side burning clean changed number one coil pack,new plugs new wires????


if oil consumption then valve guide seals may be leaking or head problems.have compression check done

Mar 19, 2014 | 2004 Chevrolet Silverado

2 Answers

How do i change the rear spark plugs on a 2000 crysler grand voyager


The best way we've found in our shop to do this is from below with the car up on the hoist.You'll have to let it cool down,the exhaust manifold is right close by and could burn your arm.
John

Sep 04, 2011 | 2000 Chrysler Grand Voyager

3 Answers

P0304 code-Misfire on cylinder 4


A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.-------- Symptoms may include:--------
  • the engine may be harder to start.
  • the engine may stumble / stumble, and/or hesitate.
  • other symptoms may also be present.
--------------- A code P0304 may mean that one or more of the following has happened:
  • Faulty spark plug or wire
  • Faulty coil (pack)
  • Faulty oxygen sensor(s)
  • Faulty fuel injector
  • Burned exhaust valve
  • Faulty catalytic converter(s)
  • Running out of fuel
  • Poor compression
  • Defective computer.
  • ---------------------
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.
If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.-----------------
This should help.Thanks.Helpmech.

Mar 27, 2011 | 2007 Chrysler PT Cruiser Touring Hatchback

1 Answer

1999 Toyota Solara V6 SLE has an engine misfire, Throws check engine codes, is running lean in bank 1 any ideas?


running lean bank one; suggest a bad 02 sensor on bank one,check engine light on? suppose so, or you would'nt have codes.may be a bad coil pack on bank one. it does'nt run without a backfire right? your best thing to do is this. check engine fire to plugs that supply fire to bank one,it may have a red fire to plugs on bank one side, but you need blue fire to plugs on bank one side.[the best spark to plugs will always be blue] you may only need to replace part of the engine coil pack, they will have numbers on them[coil pack] and which cylinders that they supply spark to. if i'm not mistaken, you will be looking from front of car, look on passenger side of motor for a bad spark plug, or may even be a worn spark plug wire,inspect your spark plug wires for a worn place where the wire is exposed to ground the spark from the spark plug. pull the spark plug out and check it for carbon build up also. for carbon build up, it will be covered with hard black substance. recommend if you do replace plugs, nepindenso, no ac plugs[cheap] no ac delso,cheap. the better the plug, the better the car runs with great mileage. hope this helps,merry christmas, and as always,if you need further assistance,please repost your question and an expert will be happy to assist!

Dec 26, 2010 | 1999 Toyota Camry Solara

1 Answer

Runs rough when idling, even worse in drive, and nearly cuts off in reverse. Loses power climbing a hill.Is not running hot. Oil and trans fluid look good. Sometimes "service engine light is on". Changed...


I would perform a compression test on all cylinders if you've already changed your plugs and wires. This willtell u if u have ay mechanical problems with the engine. Also even tho you've changed your spark plugs and wires did you check your injectors or coil packs to ensure they're good. A problem with either will also cause misfires.

Sep 02, 2010 | 1995 Pontiac Grand Am

1 Answer

96 dodge caravan 3.0 has p300 and p306 codes,


A P0306 code means that the the ECM has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #6.

A code P0306 may mean that one or more of the following has happened:

Faulty spark plug or wire, Faulty coil (pack), Faulty fuel injector, Burned exhaust Valve, Poor compression, and Defective computer. 

Check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the Caravan, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). The number six cylinder is the one towards the radiator and drivers side. If you are going to change all the plugs and wire keep me posted, be glad to help. Good luck and hope this helps, P0300 just means multi miss fire. 

Jun 22, 2009 | 1997 GMC Jimmy

1 Answer

Plug replace


This is a outstanding question!!! The plugs or wires are not visible from the top or sides of the moter. You just can't see em'!!! You have to remove the large black plastic air intake. Then remove the intake manafold(not too hard to do) to access the spark plugs and wires.
Also: After removing all the black plastic air intake stuff, you'll have to remove the coil pack (long black plastic thing that says "Ecotek" on top). The coil pack is removed by disconnecting the wire connector on the driver's side end and then removing four bolts. To lift off the coil pack, you'll have to pull upwards firmly and evenly from both sides, because the spark plug boots or wires are holding onto the spark plugs as well as the coil. With the coil pack removed, look down into the silver channels - there's the plugs. To remove, you'll need a plug socket head and a socket wrench with long extension. To replace the plugs, I use an extra or old spark plug boot to hold the plug and get it started turning into the engine threads. Good Luck!

Jun 07, 2009 | 2003 Saturn VUE

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