Question about 2004 Kia Optima

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Relay for exhaust system

Getting no fire to the spark plugs

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Probably the coil pack get a mechanic to check the OBD codes

Posted on Mar 27, 2014

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2 Answers

What would cause it to backfire if timing is correct


firing order is out by 2 plugs if v8
incorrect valve clearance or burnt valve

Dec 28, 2016 | Cars & Trucks

1 Answer

How do you check if you spark plug is firing


Take out the spark plug, place wire back on plug. Hold wire/plug by wire's boot, so firing end of plug is close to (1/4" away from) a ground like the engine block, exhaust manifold, etc.

Have some one turn the key so engine turns over.

If you have good spark you will have a bright blue spark from plug to exhaust manifold. you better use well insulated pliars to hold plug or a piece of wood to hold it to a ground to see if it sparks. good-day !

Mar 27, 2012 | Cars & Trucks

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I have porsche cayenne s with turbo exhaust system......i hav changed spark plugs at 46000 km....and after 48000km it started missing when we drive it fast and then slows down it starts missing at low revs...


first of all let car get cold
open hood chek spark pluge cable weather they are fitted well or not if every thing fine also make sure the tight spark plug well..



if above fine might some oxygen sensor problem u can chk with dealer computer

Jun 18, 2011 | Porsche Cayenne Cars & Trucks

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Do I have to take the timming belt off to do a head gasket on a 1999 chevy malibu v6 3.1L


The 3.1 engine does not have a belt,it is a chain motor.You do not need to remove timing chain to remove head.

Apr 12, 2011 | 1999 Chevrolet Malibu

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Car bucks and back fires under load.... cleaned map replaced cat


Check spark plug leads and spark plug caps.
Back fire out the exhaust can mean air leak on intake or exhast manifolds, or an exhaust valve on the way out

Feb 06, 2011 | 1992 Chevrolet Cavalier

1 Answer

First time changing fuel injector seals. i turned the switch to far the car backfired and caught on fire. i put the fire out with a dry chemical the intake was open. i changed all the wires and the spark...


When you replace the seals for fuel injectors, it's a good idea to soak the rubber seals in gasoline before installing them. This will help the rubber to swell a bit. Remove your battery connection before working on your car if you couldn't find your fuel pump relay. This give you fire insurance.

Maybe you fried your ign control module. If dry chemical went inside the intake you'll have to clean that up preventing it getting sucked inside the combustion chamber. If you fire this inside, you might bend a valve, damage your cat converter, damage your 02 sensors, damage your exhaust valve.

Working with fuel is risky, even if fire or sparks are not present it can ignite from compressing the mixture. Maybe you should buy more insurance. Remember a real mechanic may not know how each and every car works but knows every danger involved while working on it. Safety first. Cut all power before screwing around electrical work.

Apr 30, 2010 | 1997 Dodge Intrepid

1 Answer

1990 Mercedes 190e ignition system miss firing after much work


OVP relay, coil and wires usually are the culprit. If not then it gets spendy. EZL is alot and may be an issue. EHA / EGR tube gets clogged also which comes off the exhaust.

Jun 11, 2009 | 1990 Mercedes-Benz 190

1 Answer

Timing the cams and crank with a belt


  1. Note: Electronic Ignition engine timing is entirely controlled by the PCM. Electronic Ignition engine timing is NOT adjustable. Do not attempt to check base timing. You will receive false readings.

The CKP sensor is used to indicate crankshaft position and speed by sensing a missing tooth on a pulse wheel mounted to the crankshaft. The CMP sensor is used by the COP Integrated EI System to identify top dead center of compression of cylinder 1 to synchronize the firing of the individual coils.
  1. The PCM uses the CKP signal to calculate a spark target and then fires the coil pack(s) to that target shown in Figure 51. The PCM uses the CMP sensor not shown in Figure 51 on COP Integrated EI Systems to identify top dead center of compression of cylinder 1 to synchronize the firing of the individual coils.
  1. The coils and coil packs receive their signal from the PCM to fire at a calculated spark target. Each coil within the pack fires two spark plugs at the same time. The plugs are paired so that as one fires during the compression stroke the other fires during the exhaust stroke. The next time the coil is fired the situation is reversed. The COP system fires only one spark plug per coil and only on the compression stroke.

    The PCM acts as an electronic switch to ground in the coil primary circuit. When the switch is closed, battery positive voltage (B+) applied to the coil primary circuit builds a magnetic field around the primary coil. When the switch opens, the power is interrupted and the primary field collapses inducing the high voltage in the secondary coil windings and the spark plug is fired. A kickback voltage spike occurs when the primary field collapses. The PCM uses this voltage spike to generate an Ignition Diagnostic Monitor (IDM) signal. IDM communicates information by pulsewidth modulation in the PCM.
  1. The PCM processes the CKP signal and uses it to drive the tachometer as the Clean Tach Out (CTO) signal.

2.5L V6

The ignition system consists of an ignition coil, spark plug wires and spark plugs.
The crankshaft position sensor signal is the basis for ignition timing calculations. The alternating voltage signal from the crankshaft position sensor is digitized by a pulse former within the powertrain control module. This digitized signal is then used to position the closing time of the primary circuit of the ignition coil.
Ignition timing is determined by the powertrain control module in response to engine operating conditions based on stored data tables or maps. Once ignition timing has been determined, the powertrain control module interrupts the current to the primary circuit of the ignition coil thus triggering the ignition spark which is supplied to the cylinders through the spark plug wires and spark plugs.
The ignition coils are triggered by the powertrain control module in pairs (cylinders 1 and 5, cylinders 4 and 3 and cylinders 2 and 6) sending one ignition spark to the firing cylinder and one ignition spark to the corresponding cylinder on the exhaust stroke. This ensures that any unburnt fuel residues remaining in the cylinder on the exhaust stroke are re - ignited to provide cleaner exhaust emissions.
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2.0L 4 cynder

The ignition system consists of an ignition coil, spark plug wires and spark plugs.
The crankshaft position sensor signal is the basis for ignition timing calculations. The alternating voltage signal from the crankshaft position sensor is digitized by the powertrain control module. This digitized signal is then used to position the closing time of the primary circuit of the ignition coil.
Ignition angle is determined by the powertrain control module in response to engine operating conditions. Once ignition angle has been determined, the powertrain control module interrupts the current to the primary circuit of the ignition coil thus triggering the ignition spark which is supplied to the cylinders through the spark plug wires and spark plugs.
The ignition coils are triggered by the powertrain control module in pairs (cylinders 1 and 4 and cylinders 3 and 2) sending one ignition spark to the firing cylinder and one ignition spark to the corresponding cylinder on the exhaust stroke. This make sures that any unburnt fuel residues remaining in the cylinder on the exhaust stroke are re - ignited to provide cleaner exhaust emissions.
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Integrated Electronic Ignition System The Integrated Electronic Ignition (EI) System consists of a crankshaft position (CKP) sensor, coil pack(s), connecting wiring, and PCM. The Coil On Plug (COP) Integrated EI System uses a separate coil for each spark plug and each coil is mounted directly onto the plug. The COP Integrated EI System eliminates the need for spark plug wires but does require input from the camshaft position (CMP) sensor.
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Apr 05, 2009 | 1998 Ford Contour

2 Answers

1990 Subaru Legacy shorted out the ignition coil. I replaced it and in less than 1 mile,it shorted out the new one.


Subaru engines (including Legacy and engines of many other automobiles, GM, etc.) have returned to so-called wasted spark ignition systems since advent of the electronic distributor-less ignition (having been used historically in early engines with magneto ignitions). With this approach, the ignition systems are less expensive and usually quite reliable. At the same time, however, a shorted spark plug (cracked or carbon clogged, etc.) (or bad ignition spark plug wire) grounds both the ignition spark and the false spark being used. This means that it also grounds the corresponding respective ignition spark of the other 180 degree out of phase cylinder (that uses the same the same coil because the spark current is connected to the spark plugs of two cylinders). Since such a defect allows more current to flow in the spark coil to two plugs when the resistance of the spark plug gap disappears due to a cracked plug, etc, it seems likely to hasten coil burn out if the spark plug/plug wire defect is not corrected before installing the new spark coil.

To explain further, wasted spark means that when a cylinder is ready to fire, it gets a spark to its spark plug while part of the spark (from the same coil and current) as a sort of copy is also sent to another cyclinder at the same time but when the piston in that cylinder is exhausting its ignited gases 180 degrees out of phase from when its spark is needed. When the second cylinder is ready to fire and receives its "spark, the first cyclinder the also receivesa "wasted" spark "copy" of the one needed by the second cylinder. Economy is achieved in manufacture because otherwise electronics would have to turn on and off four different spark coils to distribute four different sparks as needed to the four cylinders. With wasted sparks (which are cheap), because the spark current of one coil is connected (internally in the ignition coil unit) to two cylinders that are in the same position but 180 degrees out of phase in firing, the system can turn on and off two spark coils twice as fast with half the electronics and fire two cylinders that are 180 degrees out of phase. A four cylinder engine thus uses only two coils, a six cylinder engine, three coils, etc., in a wasted spark system.

Jul 27, 2008 | Subaru Legacy Cars & Trucks

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