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Have a misfire, the scan tool said cylinder #4 put a tune up on about a year to year and a half ago, just started after I cleaned the engine compartment from a coolant leak found a cracked distributor

A strong engine has new distributor cap and rotor plugs and wires about a year old. I have thought it could be a intake leak but only 1 cylinder don't seem right and want to check a few other options first I hope

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  • 213 Answers

Hello What is the year make and model? Also, have you scanned the system for fault codes? Misfires can be caused by a number of different things including anything as small as spark plug spacing to a failed ECU and I would be happy to run the codes if you can get them. Feel free to call if need be 561 615 0103 hope this is helpful! -Tim

Posted on Nov 24, 2014

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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SOURCE: low compression in #1and #2 cylinders 1993 eclipse gs 1.8l

burned valve is likely the culprit.... or bad rings.... hook air up to that cyclinder one at a time.... and listen where the air is escaping... be aware that the motor will rotate till the piston is at the bottom of it's rotation. if it's a burned valve you will have to remove the head and replace it but somewhat easier job then replacing the rings. darn almost forgot.... it can also be a blown head gasket.... same procedure but you might need a brush and some soap water to test for an air leak at the side of the head. when you are done spray some wd 40 on it to get the water off so the spark plugs do not arc.


Posted on Sep 26, 2008

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SOURCE: 95 GMC Jimmy 4.3l W vin rough idle

My problem was solved when I repaired my 4 wd activation dash switch. The switch was contacting on 2WD & 4HI at the same time. The front differential activation is vacuum activated possibly creating a tug of war that didn't actually engage it but drained off vacuum from the engine? A theory at best but stumbbled across it because I knew the switch wasn't working properly I repaired it and low and behold rough idle disappeared and all is good for 3 weeks running.

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SOURCE: 1990 Celica GT #4 cylinder is misfiring intermittently

shaft seal in dist is bad may be able to replace might have to replace dist

Posted on Feb 20, 2009

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SOURCE: 99 5.2 durango :pulled codes for multipe missfire cylinder #5-7

Aloha We have just replaced all of what you have replaced, plus water pump, fuel pump, pcv valve and 02 sensor. Took it to mechanic today we had misfire on 1,2,6,7. Mechanic said that the 99 dodge is known for bad computers, he checked ours and works great turns out that it was the coil. Ours was jumping 1/4 inch and had a orange/yellow spark. it is supposed to have a 1 inch spark and be blue. This has solved our problems after 527 dollars later.
Check the coil!

Posted on Feb 26, 2009

  • 1 Answer

SOURCE: p0300 (random misfire) code

I would suspect your distributor is faulty. It isn't too hard to remove it and inspect for wear. Set the engine at TDC, then unbolt and remove distributor. Remove cap and check for bearings and/or metallic debris inside of distributor. If so, it is toast. Even if you don't see any metal particles inside, check that the distributor rotates freely by hand. If not, you will need to replace the distributor assembly soon.

Posted on Nov 15, 2010

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I have 1999 grand jeep cheroke v6 with 180,000

USA CAR? why not say that.?
a tune up is 1st not last. for 100 years.
skipping that 60k service or 100k, is the cause.
you have misfire. hot and cold
id have to do 3 to 10 tests to find it. but that be after a tuneup.
why delay doing that. so odd......
you can not burn fuel right with no or weak spark, so.....

this is called misfire, (hot and cold, no hot actual temp stated)
our USA cars have OBD2, PCM.
so why not connect a scan tool to the OBD2 16pin port, and scan it.
see all those errors, BINGO !!!!!
that be 2nd after a real tuneup.

p0300s are random misfire.
and P0301 is cylinder 1 misfiring.... like that...see?
me knowing the DTC errors, makes troubleshooting impossible.

here are some rand come causes of all misfiring.
  • bad compression 1 or more cylinders, (not at spec, psi)
  • Bad spark 1 or more (tuneup time full )
  • Bad fueling. (too weak or too much 1 or more cyl.)
  • injectors leaking. 1 or more...
  • injectors clogged in whole or part. 1 or more...
  • intake air leaks , cause lean misfire.
  • water thermostat stuck open, and never reaches 180F min.
  • ECT lies, and water is 180f but reads say 140 on scan tool.
  • lots of other thinks, all seen on scan tool, sensors inputs.....
end guessing list. the first has 50 causes. bad engine.
so guessing is futile.
we do simple tests, with simple tools and let the EVIDENCE speak.

do you want us to guess, or show the tests, and the order.
you call,
we can not guess what you are asking unless you say so.
here is one example
hello my car misfires. EFI engine.,
i have nyo tools , and no books and do not want to buy any.
nor learn.
what is wrong.? with my engine.?
answer, get it serviced, or do the tuneup and pray.
listing the 50 causes, is futile.

Sep 24, 2014 | 1999 Jeep Grand Cherokee

1 Answer

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

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

2 Answers

02 ford windstar sometimes it chuggs going down the road changed the master air flow housing and sensor also changed the fuel filter what other reasons would it still be running rough???

CEL glows running?
scan codes stored, use a scan tool ,
chuggs. my guess this is misfire.?
misfire code is P0300 (random) either stored or in pendings
misfire has many reasons.
1 cylinder is like P0301 #1 misfire.
P0300 all cylinder, so not knowing what codes is stored, makes diagnoses, endless.
also does it misfire hot or cold engine or both
going down the road, flat, hills, steady cruise, fast right foot only.?
just a hint of when, and how.? WOT up hills> (wide open throttle)

misfire is under BASICS.
1`; poor compression on hot motor? if fails hot.
2: bad spark ever consider doing the 60k mile listed tune up? if not why not? all steps. not just 1 filter.
3: bad fueling.
4: stuck open EGR (covered under 60k, clean it.)

there are tests for each fail point. above.

use a scan tool, no scan tool the job is 100 times harder.

Oct 23, 2013 | Cars & Trucks

1 Answer

Car idles fine but when you step on the gas it bogs down, and won't accelerate. The car will not go over twenty miles an hour.

what year.
ever tune it up,
no, then the fuel filter i packed, air filter same.
if it is tuned up and newer than 1996 and in USA, (are you)
then you can use any scan tool for $7 and read DTC errors.

to get power from any engine only takes these things.
1: DC power to EFI, a volt meter, proves this is 1min.
2: full compression,. 4 readings.
3: good spark at all spark plugs, 4 tests.
4: good fueling. (tool lean, bog, too rich misfire bog"violent")
there are 4 tests.

the tune up also cleans the EGR valve /
there are other rare failures but the above is the majors.

Oct 09, 2013 | Subaru Outback Cars & Trucks

1 Answer

Missfiring detected in OLDSMOBILE intrigue 2002 3.5L

For engine misfiring problem check the help links mentioned below. Click the link below to go through the troubleshooting procedure :---- Engine misses and truck jumps? Hard to down shift? Issue with high gear only?

Bad miss at idle?

While stop engine idles like cylinder missing?

Engine Misfire codes for car?
Engine Misfire codes?

Misfire on cylinder 4?

Oil on spark plugs and car misfires?


This will help.


Jan 30, 2012 | 2002 Oldsmobile Intrigue

2 Answers

Code 303 and 304 and check engine light plugs have not been changed 119.000 miles is it tune up time

P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

sounds like a new set of HT leads and plugs wouldnt go amiss(fire wires) weird name that fire wires HT stands for high tension leads in proper english .

Mar 07, 2011 | Ford F-150 Cars & Trucks

1 Answer

I have a 2000 chevy blazer 4.3l engine\is backfiring

Start by checking each cylinder for spark with a good spark tester. A misifre is either spark or fuel, so you can cut the problem in half. The engine light is probably on due to the misfire.

Sep 20, 2009 | 2000 Chevrolet Blazer

1 Answer

1998 chrysler sebring convertable limited misfire on all cylinder

Assuming a "complete" tune up is plugs and wires. Recheck all wires that they click into fit. I would put fuel additive in the gas tank, I prefer to use the $3.00 method as opposed to the $65.00 cleaning method. You may need to do this more than once, but most deposits can be cleaned from the injectors by just running the additives. I'll bet you a quarter she 'purring' again in 3 days. Yes I've got the quarter. Sheesh!

Jun 11, 2009 | 1998 Chrysler Sebring

1 Answer

97 Honda Civic shakes at start and check eng light comes on.

It looks like misfiring in one cylinder. That is why check engine come on. Misfiring can be due to spark plugs/wiring/worn distributor cap. Maybe also vaccum leak and clogged injectors (use injector cleaner).
You can read the trouble codes at Autozone store for free
Please kindly let me know if this infor was usefull for you or you need more infro
Good Luck

Feb 09, 2009 | 1997 Honda Civic

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