Question about 1996 Jeep Grand Cherokee

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I replaced the top part of the engine ,plugs, distribtor& cap, wires, injectors and i am getting a misfire on cylinder 3 the compression is good so we changed wires again now its reading misfire cylinder 4 help

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Need to know why you did what you did. What was the original complaint before the work.??

Posted on Jun 07, 2010


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It has a misfire ,we changed the plugs and the coil pack and wires still has a misfire what else could it be

Gas or compression. Check the injector circuit on 1 and 3. Are they pulsing, to put gas in the cylinders? Do a compression test to rule out loss of compression as cause for the misfire.
Kind of odd it would be 1 and 3, but that is one right after the other in the firing order of, you have a single coil? So you have a distributor-examine closely the distributor cap and rotor if those were not changed too, with the plugs and wires. Look for damage, little black tracks that indicate shorting of the spark, maybe damage at the electrode tips on the inside of cap on 1 and 3 plug wire towers. Most people change the cap and rotor when doing the plugs and plug wires.
Just a possibility also, that the injector ground wires for 1 and 3 might share the same ground. That is to say, they might splice together before going to the computer where the computer internally grounds injector circuits to cause pulsing. Well, those are my thoughts, good luck. And let me know what you find, always interested.

Dec 13, 2013 | 1998 Dodge Neon

1 Answer

Terraza P0303 Code. What's most likely cause? Injector, spark plug, wires or any of the above?

Might be dirty injector or burned valve. Check the connector on the injector. If good, run a compression test on all cylinders. If compression is significantly lower on #3, the head will have to come off. If compression is good, pull up the injector rail with injectors and wiring attached. Watch the injectors spray as someone cranks the engine.

Sep 02, 2017 | 2005 Buick Terraza

1 Answer

1999 GMC Jimmy 4.3 gets P0303 (#3 misfire) Changed plugs, cap, rotor, wires. Did not help. Read GM tech bulletin and replaced fuel injection system from SCPI to MFI. Did not work. Checked #3 plug again...

Yes . You need an ohm/ volt meter. First check the injector, at the leads of the injector you should have 11 to 15 ohms. At the injector plug with the ignition on you should have 12 volts at one of the wires. To check for fire at the plug put the meter leads on the plug leads and crank the engine. the voltage should spike. My guess is that you have a bad wire on the #3 injector. All the injectors will have 12 volts with key on. The ECM grounds the injectors according to where the crank/cam sensor is. On your vehicle it fires 2 cylinders at a time. This is why I say you have a bad /broken wire. At the #3 injector plug you can also check for ground to the ECM. Instead of putting both leads to the plug you have to first find the ECM wire, then put the meter leads to that wire and ground on the battery. Again it should spike in ohms

Sep 05, 2011 | 1999 GMC Jimmy

3 Answers

I have a 1998 D1500 318 V-8 3.2L . The computer keeps tripping the check engine light and coding cylinder 4 misfire--yet the plug is good and the distributor cap is not problem??

Hi, there are 2 common reasons for a single cylinder misfire you have not addressed it: faulty fuel injector and burnt valve.
You need a voltmeter to test the injector:
Check the resistance across the injector terminals. It should be about 12 ohms. If open or shorted, replace the injector.
After removing an injector, apply 12 volts DC across the terminals. A "click" should be heard. If not, replace the injector.
If ok, then you need to do an engine compression leakdown test with cylinder compression gauge. if compression leaks down in that cylinder, then you have a burnt valve causing the misfire

Jul 24, 2011 | 1998 Dodge Ram 1500 4WD

3 Answers


P0301 - Cylinder 1 Misfire Detected.

- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
- Intake air leak

- Perform Injector Service
- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

P0303 - Cylinder 3 Misfire Detected.
Follow info from P0301.

P0316 - Misfire Occurred In The First 1,000 Engine Revolutions.

- Damaged CKP sensor.
- Ignition System.
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Base engine
- Damaged Powertrain Control Module

Usually the P0316 is combine with a P03XX codes. The P03XX code indicates in which cylinder the misfire occurred.

Jan 17, 2011 | 2002 Mercury Sable

1 Answer

Rebuilt engine in 96 mustang,engine is stalling and sometimes dying.Put on machine and it said 2 and 3 are misfiring.Found out today someone replaced one of two oxygen censors with one that was for a...

The wrong part would be the first thing I would get rid of. If the part was not damaged by the grinding, there are operating ranges for the feedback of these O2 sensors which affect the settings of the Engine Management Systems. The wrong part would have to have an identical range as the correct part to work right.

The Misfiring probably has another cause. You have 2 misfiring cylinders. Make sure the wires on #2 and #3 are not crossed at the coil-pak. Then check your Intake Manifold for loose bolts. If no luck, take the good plugs on 1 and 4 and swap them with 2 and 3. Clear your engine Codes and see if the bad cylinders stay the same or follow the plugs. If cylinder 2 and 3 still misfire, its not the plugs. Test the Injectors. Switch Injectors as you earlier switched plugs, clear the Codes and see if the misfiring follows the Injectors.

If the misfires follow the Injectors, you have found the problem. Two bad Injectors. If cylinders 2 and 3 still misfire you need to check the wiring or coil-pak. Cylinders 2 and 3 each have working sparkplugs and working Injectors from the earlier swap and it is not helping.

Before blaming a head gasket, test the Injector wiring and follow the wiring to the connector for a corrosion check on the pins. If no success do a compression check on #2 and # 3 as they are adjacent to verify a blown headgasket.

I hope you find my solution very helpful. I have provided info letting you work with the parts you have. If you want to install new plugs or do a compression test first and have the tools go ahead. You will save testing time, then follow my swap methods for further results if you have good compression.

Jan 08, 2011 | 1996 Ford Mustang

1 Answer

1997 Dodge Stratus, 2.5L 4 cyl engine. Engine diagnosis from a trouble reader = cylinder 3 misfiring. The plug and spark plug wire are good. I don't know how too test the electronic ignition or the fuel...

Test the compression in that cylinder. Make sure you have the correct plugs, and good wires, as well as the cap and rotor button. If you have good compression, and the plugs and all are good, I would suspect either a bad fuel injector, bad head, or a bad distributor.

Aug 12, 2009 | 1997 Dodge Stratus

5 Answers

Hi, I have a 1997 Porsche 993. Motronic 5.2 M07. I am getting these fault codes 1) 62 misfire emissions-relvant 2) 51 Cylinder 2 misfire emissions-relevant) 3) 54 Cylinder 5 misfire ...

misfire :-------- try checking your 02 sensors /fuel pump and filter.

for 51 cylinder misfire :---
Change the coil. Period. Very easy to remove from the vehicle if it's a 4 cyl. Follow that spark plug wire from the spark plug to the other end. What it's attached to you should replace
for 54 cylinder 5 misfire :---First you have to eliminate the most obvious problems, like spark plug and spark plug wire. If you replace those and you still have a misfire, then it's a good idea to look for a vacuum leak in the intake manifold

Mar 07, 2009 | Porsche 911 Cars & Trucks

3 Answers

1997 ford f150 cyliner 7 misfire

sme problem had to have it put on computer and codes reset

Feb 05, 2009 | 1998 Ford F150 Regular Cab

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