Question about 2007 Chevrolet Cobalt Coupe

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Dead cylinder but its not the plugs or coil pack

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  • Roberta Smith
    Roberta Smith May 11, 2010

    what colour is the exhaust smoke ?

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Maybe a bad injector. or u need to do a compression test to seeif ther is enough to firethe fuel.

Posted on Feb 19, 2009

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2 Answers

No power to ignition coil


2004 Suzuki Forenza , so say title.
what engine?, 2.0L or out side usa with 5 engines used.
power to.,.

  1. check fuses yet, that be first. (all electrics that.)
  2. scan it next to see DTC errors related to IGN COIL.????
  3. RTM , the manual is 4 bucks read that yet?


https://suzukipitstopplus.com/Products/1027-2004-forenza-service-manual.aspx

so are you saying there is no spark on all 4 cylinders.
that be first, 1 &4 dead or 2 &3 dead. (coil pack pairs, not with wires scrambled, they most not be connected WRONG)

if only 1 pair fail we have a cure.
if all 4 die, other ,,, see?
tests matter, doing all tests on wasted spark, tells you whats up.
test with 2 spark plugs. new.
shells gounded.
1 and 4
then 2 and 3. pairs.
all 4 fail, or just 1 pair? a key fact. on all wasted spark systems.


if you scan and get DTC shows, cmp dead, ckp dead or
ignitor 1 dead, well, ???? do you>?
coil pack
if pin 2 is 0v, cranking
the fuse EF10 is blown or the pump relay open.

to fix cars like this, you need the book, the schematic,
as seen here.
the ecu fires the hidden coil pack drivers.
if one plug goes open , you lose 2 cylinders
if one HV wire goes open, same.
see?
if one HV wire shorts to ground only THAT cylinder goes dead.

pin 86 is 12vdc cranking
pin 85 , the ECU grounds this pin to send power to the coil pack.
pin 30 is obvious, 12vdc all the time.

25959996-4zravhdsrnjs1qqbtsjws2h4-4-0.jpg

Nov 14, 2015 | 2004 Suzuki Forenza

1 Answer

I have a 94 ford ranger, 4 cylinder 8 spark plugs, 150 thousand on it, the vehicle has ran flawlessly until a week ago, the first sign was driving down the road it started skipping and had a huge loss of...


Two plugs per cylinder? Just wondering why it has twice as many plugs as it does cylinders.

Anywho; have you tried fresh wires, or at least swapping them around?

Nov 28, 2014 | Cars & Trucks

1 Answer

My suzuki vitara 20v6 number one plug is not


its a 2.0L V6 called the h20 engine
in some countries, this engine uses a coil pack with 1 coil per
2 cylinders, this magic is called Wasted spark.
some have 3 coil packs for 6 cylinders
others have 1 huge pack with 3 coils inside.
what you have , im totally clueless, (no country stated, dig?)

but no matter, the pack is bad, or the wire that is FINE, is not FINE
no human on earth can test a HV wire, no body.! ( 1 out of 4 sure)
that is fact, (sure if opened) but what about the other modal failiures.
1: insulation breakdown.
2: resistance wrong, (say too high)
3: intermittent.
4: dead open, anyone can test this, its a no brainer. if ever.

this fact is why the 60k mile tune up, will fix it. new wires.
new HV wire set, I run NGK MAG wires, they last 2x longer.
easy.

no only that. with wasted spark , the other plug in the loop can cause your dead plug to be dead. and its wires too.
that is because it is a LOOP

if both plugs are new and both wires are new
then the coil is bad.
coil packs are usually way more expensive that $2.49 spark plugs
or $20 wires.

Aug 27, 2014 | Suzuki Vitara Cars & Trucks

1 Answer

Dead miss on one cylinder 99 sl2


A quick way to check the single coil pack if you know for sure which cylinder is miss firing and its setting a code you can swap the coil pack to another cylinder and see if the miss changes from one cylinder to another. If it travels to where you moved the coil then the coil is bad,if not you have other problems.

Mar 16, 2014 | Saturn Cars & Trucks

1 Answer

I have a 2002 TrailBlazer with the straight 6,diognostic check said #3 cylinder was dead or misfiring, also map sensor showed up. #3 cylinder was misfiring, so to test the coil pack I swapped #3 coil pack...


did you replace only one spark plug? that can cause issues because of differences in resistances between cylinders. also, did the map code stay off after replacing
?

Feb 28, 2010 | 2002 Chevrolet TrailBlazer

1 Answer

91 caviler running on 2 cylinders just changed plugs and wires , was having a backfire on heavy acceleration


If the two dead cylinders are close together,then the head gasket may have blown out in between them.See if the timing has jumped.If it has a coil pack,the the coil pack may not be firing the two dead cylinders.

Nov 20, 2009 | 1991 Chevrolet Cavalier

1 Answer

I have a 2006 Saturn Ion. It started running


You can by a new Coil pack from Auto Zone for less then the dealer's cost and Auto Zone can give you the step by step instructions for you to replace the coil pack free of charge and will take about 1 hour if your good with common tools. Auto Zone also can scan your car for DTC codes Free of charge to ensure that it's the coil pack. The other common problem that will also seam like a bad coil pack is a bad ignition module which is what I  am leaning towards since it's three of the cylinders you mentioned, most of the time it's just one of the two coils that will go bad which would only make two of the cylinders go dead. Check the wires to the electronic module first and then the switch the coils and see if the same two cylinders are still dead, if the same cylinders are still dead. Good chance that it's going to be the module and if the other two cylinders go dead and the dead ones come alive then it's going to be the coil pack. Good luck and here is a you-tube link to the ignition module and coil pack replacement procedure. keep me posted, be glad to know you got your car running 100% again . http://www.youtube.com/watch?v=8XgHM1i5jK8

Oct 27, 2009 | 2006 Saturn ION

1 Answer

Starts fine, smell fuel, rough idle-missing.


have you tried testing your ignition coils, there's 3 of them in a pack, i've had to change a couple when my lumina euro was running badly.
the coils send the spark to the spark plugs, if you have a bad coil, the cylinder won't fire. which would explain the gasie smell. a bad coil will also contribute to loss of acceleration, power and a rough idle.
the coil are rather cheap, about $20cdn each. usually one is dead and the others are good.
to test if your coils are working, what you can do is...
- start your car - unplug one cable and replace it and listen for a change in sound in the engine. if there is a noticable change in sound then that cylinder is working. - if you unplug a cable and nothing happens, and plug it back in and nothing happens, that coil is dead. you will have to replace it (one coil powers two cylinders, each independantly. one cylinder on a coil may work while the other is dead).
*please remember to unplug and replace a cable one at a time. and while doing this don't touch the metal framing of your car, our you'll get a nice zapp.
this is a cheap and easy way to test you coil pack. my friend spent about $1000 and 3 mechanics and they never checked the coils. i did, and didn't cost him a thing.

Jun 05, 2009 | 1990 Chevrolet Lumina

1 Answer

Misfire code on 2001 2wd jeep cherokee what can we try


I would lean toward a dead coil pack or a dead plug, there is no way to test the coil pack other than removing it and keep the wires plugged in and install spark plugs in the grommet cavities of the coil pack and check for spark across all cylinders( assuming its a 4.0L)

Apr 21, 2009 | 2001 Jeep Cherokee

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