Question about 2001 Jeep Grand Cherokee

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We have replaced the coil pack 3 times and the pcm once and about every 6 months we get a code for misfire on cylinder # 1 and winds down to replacing the coil pack every 6 months. Have seen this before

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  • yadayada
    yadayada May 11, 2010

    The coil pack is not the problem, have the dealer look at this.

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  • 145 Answers

The ignition module may be going bad Are you using oem coils

Posted on May 21, 2009

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2006 grand prix gxp 5.3. When you are driving normally it will miss from 50mph and up. When you punch it it doesn't miss a beat. I cleaned the maf sensor and air filter, Plugs were replaced.


It's probably a coil breaking down , have a scan tool hooked up an have misfires checked to see which cylinder is missing .
Ignition Coils
Each ignition coil has an ignition 1 voltage feed and a ground. The engine control module (ECM) supplies a low reference and an ignition control (IC) circuit. Each ignition coil contains a solid state driver module. The ECM will command the IC circuit ON, this allows the current to flow through the primary coil windings for the appropriate time or dwell. When the ECM commands the IC circuit OFF, this will interrupt current flow through the primary coil windings. The magnetic field created by the primary coil windings will collapse across the secondary coil windings, which induces a high voltage across the spark plug electrodes. The coils are current limited to prevent overloading if the IC current is held high too long. The spark plugs are connected to their respective coils by a short secondary wire. The spark plugs are tipped with iridium for long life and efficiency.
Drive it long enough like that (with it misfiring ) the check engine light will flash . This is to warn that a catalytic converter damaging event is taking place . This would also set a DTC - diagnostic trouble code
DTC Descriptors ?€¢
DTC P0300 Engine Misfire Detected


?€¢
DTC P0301 Cylinder 1 Misfire Detected


?€¢
DTC P0302 Cylinder 2 Misfire Detected


?€¢
DTC P0303 Cylinder 3 Misfire Detected


?€¢
DTC P0304 Cylinder 4 Misfire Detected


?€¢
DTC P0305 Cylinder 5 Misfire Detected


?€¢
DTC P0306 Cylinder 6 Misfire Detected


?€¢
DTC P0307 Cylinder 7 Misfire Detected


?€¢
DTC P0308 Cylinder 8 Misfire Detected

Apr 26, 2016 | Cars & Trucks

1 Answer

I have toyota tundra v6 hesation on depression of


After about 6 to 7 years all the ignition coils fail

Keep diagnosing the cylinder misfire issues

Need professional scan tool software, to use Mode $06,
& look at other data, as your not going to get a perfect
fault code every time & just replace a failed part

There are times when professional tools won't work & you
have to walk a new coil or use a scope on a road test & that
could take months before the coil goes down

How about the spark plugs ?
Over 3 years old ? loose them

Smoke the intake-- for vacuum leaks

Look at fuel trim for that bank with the Misfires

O2 Sensors over 100,000 miles

Fuel Pressure Correct at fuel rail?

Sep 26, 2014 | Cars & Trucks

1 Answer

What causes engine misfires to stay after new plugs and coil packs?


Try swapping the coil packs around - like swap #1 with #2, and swap #6 with #5, see if the misfires MOVE with the coil packs swapped to the new cylinders or if they stay with the cylinders. If they move with the coil packs, the new coil packs are bad. If they stay with the cylinders, there's a problem with those cylinders. You DID replace that camshaft sensor, right?

Have you checked your #1 and #6 injectors?

Aug 07, 2014 | BMW 528i Cars & Trucks

1 Answer

Random multiple misfire P0300, P0302, P0304 on 2006 Kia Rio


A competent mechanic will check all probable causes associated with these DTC codes.
Code P0300: Random-Multiple misfire detected. Probable causes:
1. Vacuum leaks, damaged hoses, or improper routing
2. Fuel contamination
3. Ignition system - Ignition module, coil, spark plugs and wires
4. Fuel system
Code P0302: Cylinder 2 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system
Code 0304: Cylinder 4 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system

Be sure the invoice enumerates all of these probable causes as having been checked. Also, some of the replacement parts installed earlier may be faulty.

Jan 19, 2014 | Kia Cars & Trucks

3 Answers

I have a 05 VW Pessat with a 1.8L 65K miles on it. I have a random misfire and surge at idle. Code's set: P0300, P0301, P0302 and I seen P0303. This misfire comes and goes. Does not have a dead miss. I...


Try the crank pisition sensor that is vary likely to be the couse of your misfires its working but its intermintly shorting out telling the pcm that you have a misfire and setting the codes

Nov 22, 2010 | 2004 Volkswagen Passat

2 Answers

I have a 1996 Plymouth Grand Voyager SE with a 3.3 liter V6 Engine. It hasn't been firing on the 6th and 3rd spark plugs, and is only running off of 4 of them. I was told to replace the camshaft position...


The coil pack unit's circuit #3 drives plugs #3 and #6 directly from the PCM. If the cam sensor was defective, it should not fire any plugs. Suspect bad wiring from the PCM to the coil pack, the PCM unit itself, or a segment of the camshaft position sensor surface has lost magnetism causing missing signal to the PCM. An oscilloscope is the best test instrument for chasing down a missing pulse problem. The missing timing signal also explains why the PCM would report a 'bad camshaft sensor'. Hope this helps!

May 11, 2010 | 1996 Plymouth Grand Voyager

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

4 Answers

I have a 2001 Mercury Sable the check engine light is on it also blinks at times. I have done a oil change also air filter and oil filter checked the spark plugs and replace an air flow hose the engine...


First I recommend you get an auto repair/maintence manual for about 20.00. by Chilton or Haynes then check trouble codes for your sable, this manual is reasonable and will aid you in any further and future repairs. this manual is the type I use, I work on or vehicles-( shady tree mechanic)

Jul 11, 2009 | 2001 Mercury Sable

1 Answer

2004 Neon SXT cylinder misfire


TRY REPLACING THE CRANKSHAFT POSITION SENSOR..HAVE SEEN THESE CAUSE MISFIRES AND LOW VOLTAGE DTCS AS PCM THINKS VEHICLE IS NOT RUNNING..ALTERNATOR MAY NOT BE PUTTING OUT PROPERLY

Jul 05, 2009 | 2004 Dodge Neon

1 Answer

Coil pack


Cylinders 2 - 4 - 6 are facing the radiator. Cylinder 2 is closest to the drive belts.

Cylinders 1 - 3 - 5 are facing the firewall, cylinder one closest to the drive belts.

Hope this helps; and Thanks for choosing FixYa for assistance.

Feb 25, 2009 | 1993 Toyota Camry V6

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