Question about 2000 Chevrolet Cavalier

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#3 cylinder misfire -put in new plugs car hesitates alot when accelrating also when a/c is on it gets worse sometimes stalls, i think theres only 1 injector on this motor could it be that , hate spendings alot for diagnosis,

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  • yadayada
    yadayada May 11, 2010

    spend the money

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  • 216 Answers

Replace your spark plug wires .

Posted on Jun 30, 2009

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I have a 2003 jeep grand cherokee, It started


wow, no engine option stated, and no DTCs.

4.0L I-6 or 4.7Liters?

WHY DO THAT FIRST. $$$$ parts first.

why not do a tune up first.

you swap in the most expensive parts first? ouch,

The PCM tells you when ckp or cmp fail, with DTC codes

so its not that. but you never posted ALL DTC errors. why not do that.?

do a real tuneup? heat (spark plugs, filters.)

if you have P030x errors,

eg: p0301 is cylinder #1 is misfiring (3 ways to do that not JUST spark)

eg: P0300, random on all cylinders. (fuel mix wrong) or never tuned up.



Misfire 101; (example P0301 DTC)

P030x codes, are all just about spark, misfire is caused by 3 things, (at least)

1: sure spark. weak. (tuneups work as does hV wires sets if no COPS) if 1 cop is bad move it to other location, does failure follow the move>???????? buy new cop boots if engine has cops.

COPS means coil over plug, so v6 has 6, v8 has 8.

coil packs have 3 coils inside for v6 and 4 for V8. called wasted spark to any tech.

2: low compression, think of your v6 (is it) as 6 engines, not 1.

3: wrong FUELING rates. including air leaks to 1 cylinder.

if engine has EGR that too, will cause gross misfiring.

so can an air leak near one intake runner, causing 1 cylinder to misfire.





why not scan it with a real scan tool that can see ALL jeep codes

then post all DTCs found. both idling and driving for 45mph or 1/2hr.

with these facts and what engine is there we can do the remaining tests.

free book



http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service







The tune up is this and filters.

do the tune up, new wires, and plugs using correct spark plugs not some bs, magic ones, use spec, plugs first. its in the manual.

then HV wire set on 4.0L,

if cops V8 , 4.7L try new boots on them. or swap them to find bad one.

the USA car V8 has coil on plugs





misfire means ONLY that this cylinder has weak COMBUSTION

its not weak spark only, that is only 1 cause of poor combustion.



post DTC\'s driving and we can fix it

the best tool is the

Innova 3160 scan tool, that is what I use on home cars.

it does all jeep codes, ALL.

i can drive , and scan and log DTCs.

and gather lots of facts on errors.

that is always the best way,

you can not fix cars today with out owning a scan tool.

unless , luckiest man on earth. (guessing)

Sep 17, 2014 | 2003 Jeep Grand Cherokee

1 Answer

2002 ford escape misfiring changed all plugs gaskets boots


I would have it scanned and check what cylinders are still misfiring. I would change the ignition coil for that cylinder and see if that fixes the
problem. If the misfire is still there...the PCM will likely need replacement.

Feb 01, 2013 | 2002 Ford Escape

1 Answer

1996 isuzu rodeo keeps reading #2 misfire runs good xcept when cold it hesitates most times or jus occasionally hesitates then the check engine light flashes and its guzzling gas i only got 50 miles on a...


A misfire alarm typically means the coil pack mounted above the sparkplug indicated in the misfire had gone defective.

To test it, swap the coil pack with another cylinder, and see if the misfire goes from #2 to the cylinder you put it on.

If the misfire continues to be on #2, then consider changing the sparkplugs.

I hope this helps.

May 14, 2011 | 1996 Isuzu Rodeo

3 Answers

I started having a problem about a month ago. My 2003 Mercury Grand marquis LSE tuned up at 100k currently 145k. started hesitating and slight bucking at cruise speed. I went to autozone and coded #8...


A misfire can be related to a number of causes. Since the coil and spark plug were replaced and it did not solve this issue, it is most likely related to the circuit for the number 8 cylinder. A thorough inspection of the electrical circuit is what is required next. Also, engine compression will need to be tested on that cylinder as well as cylinder number 6 that is next to it. Vacuum leak around the intake port of the number 8 cylinder could also be a cause and will need to be checked.

Mar 31, 2011 | 2003 Mercury Grand Marquis

1 Answer

Have a 2002 Chevy Silverado 5.3 4wd. having engin hesitation problems.... service engine light came on...... Changed plugs (Autolite .040 gap) and wires. Problem continued, got worse Had auto parts...


Try swapping the injector on that cylinder with the one next to it and see if the misfire changes to the other cylinder.If it does then you have a plugged or bad injector.It it still stays on that same cylinder then check compression on the number 6 cylinder.Let me know what you find out.Good luck.

Aug 18, 2010 | Chevrolet Silverado 1500 Cars & Trucks

1 Answer

Rav 4 2004 stalls, sputters won't run changed plugs, ignition coil and camshaft senor.Put in cleaned used mass air thing.Sometimes code says cylinder one misfiring. What's the problem?


Change your plug wires. If you want to, switch wires with another cylinder. If the misfire moves to the new cylinder, you found your bad wire.

Feb 20, 2010 | Toyota RAV4 Cars & Trucks

2 Answers

Poor performance, hesitation, sluggish and shaking


Those are cylinder misfire codes. PO300 is random misfires (meaning 1+ cylinders misfired) and the other 2 codes are for cylinder #1 and 2. Did you change the ignition coils yet on 1 and 2?

Do you let the tank go to empty before refueling a lot?

Sep 02, 2009 | 2004 Audi A4

2 Answers

Hesitates like it want to flood when starting, Getting worse


Could be aging ignition cables letting you know that winter is coming and the condensation that can form overnight can invade cracks that can bleed off some of the high voltage you need at the spark plugs. After the engine is warm, leaky cables can temporarily 'heal,' drying out and losing less than when cold.
If they are sufficiently bad, sometimes you can see some sparkling going on under the hood if you park in a dark area. 
If you have 50k on your plugs, it may be time to replace those too.  

Oct 02, 2008 | 2001 Nissan Sentra

2 Answers

My van seems to be having random multiple misfires


First,investigate the warranty,as there is no need for you to be spending money out of your pocket if the warranty covers such items.As far as the misfires,they can be caused by items a little more in depth,although the spark plugs are the first items to check and replace.The spark plug wires can also cause misfires,as well as coil or coils,and injectors being dirty and partially plugged up.If your engine utilizes spark plug wires,replace them,as they will leak voltage when old,and cause misfires.Anything beyond that will require more diagnostics.Every diagnostic trouble code (DTC) has a diagnostic route as prescribed by the manufacturer.These diagnostic routes are available through pay sources such as All Data online.If the simple things like plugs and wires doesnt fix the problem,then diagnostics are in order.Good luck.

Aug 10, 2008 | 2004 Dodge Caravan

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