Question about 2002 Ford ZX2

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P0300 Engine Code Ford ZX2 2002 ZTEC dual over head cam engine. Has 107K miles. Has new plugs, Only thing I really notice is when I turn on AC the car seems to stumble at steady speeds, especially interstate speeds. Also, car is starting to get hot (temperature gauge) in stop and go interstate when outside temperature is above 85

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P0300 Random Misfire

Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

A Random Misfire code usually indicates a vacuum leak or bad gas.

NOTE: If a misfire in a specific cylinder should lead you to check the spark plug, fuel injector and compression.

Posted on Jul 25, 2009

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Check engine light came on ....error code detected po300 random misfire detected... 2013 forester with 35,000 mile on it....what should be my next step?


check plugs and coils --also possible bad fuel ---try reset code to see if it comes back --the following link can also assist with p0300
SUBARU FORESTER ENGINE CODE P0301 P0303 also their is an old forum thread about the misfire and possible about an update for vehicle to correct problem didnt see any thing about update but you can check with a dealer about it
P0300 P0300

Jul 08, 2017 | Cars & Trucks

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Why is focus is suddenly running rough. pingy sounds like timing is advanced 2001 2.0?


With out actually hearing it or knowing what engine is in it it hard to be 100% sure but, it depends on if its the 2.0 spi or the 2.0 ztec dual overhead cam, if its the spi, that particular engine is known for dropping the valve seats out of the head, the seats are the sealing steel sealing ring that the valve closes against during different strokes of the engine. its an aluminum head and a steel seat, they will expand and contract at different rates, if the seat doesnt have enough interference when pressed in it can fall out and damage the head, valve and piston, when the seat comes loose you will have a misfire and a noise coming from the engine, now.... that being said it could be a timing belt that has partially slipped... this is a real tough call without seeing and or hearing the car, what codes does it have?, whats the fuel pressure etc.... This is one you should have a qualified tech look at... sorry.

Aug 03, 2014 | 2001 Ford Focus

1 Answer

2003 Buick 3800 engine 82,000 actual miles on it multiple/random misfire code How it started.. Car was running fine. Check engine light started flashing and engine started missing. What...


You can't rule anything out yet. It could be a plug or injector among other things, but probably not low fuel pressure. If you have a code 300 and nothing else, you may have to wait until the problem gets bad enough to set additional codes. And if any of the sensors fail, such as the cam or crank sensors, you'll get a code for those to be tested.
Have the plugs been checked or replaced in the past 30,000 miles ?

Mar 12, 2014 | 2003 Buick LeSabre

1 Answer

Turns over but no spark, after new head askets


are you asking this 3 times removed? really>????
is this the 4 cam v6 or 2?
the 4 cam has 2 gears for 2cams and belt drive. 6ve1
the 2 cam v6 has no gears.
6ve1 engine, they have real names and all run different EFI controls
all do.

ok no spark (tested the wrong way !!!)
fuses good. or not, we test them not guess, on (looks ok)
you need to run compression on any engine with new head (or pulled) or leakdown 10x more safe.
that be first. you can bend valves on the 4 cam engine
(not on 2valve engines,one per bank)
forget the 2 CMP sensors on rear of both heads.?
spark dead on all 6 spark plugs
ckp dead.
CMP 1 or 2 dead
fuse blown.
has 6 ignition coils right, (usa) called C.O.P.'S.

i bet you didnt scan it cranking did you
if the pcm on the 6ve1 engine, sees cams turn wrong
it cuts spark to keep from bending over the head valves
the cams must be timed correctly and not in a cavalier manor
what's your engine vin code 8th digit
that tells the helper what engine is there, as you seem not to know.
there are 3 different V6 used here.

i see you really didnt check spark, just assumed it.
why? extend one cop, use fresh grounded test spark plug
omg got spark omg on all 6 in fact
omg compression is dead. x6 bent valves.

i never ever ever, crank any DOHC engine (messed with like this)
until the leak down test passes, by hand with shop air.
this act,saves further damage

VIN = Y or W
eight digit of vin is engine code. !!!
are 4 camsl

its flooding
so, compression is gone
sparks gone
or it over injecting for some reasons
if compression is ok, 150psi +
and parks good
secret wide open throttle will clear floods, (cut fuel mode )
but all this is risky on any 4 cam interference engine.

when i put the belt back (assuming cams not removed)
I check cam timing 2 time or 3 times, or risk bending valves.
6ve1
then do the leak down test now, just like you are there.
hand turned crank. (at each of the 6 TDC points(skills)
opps its got 0psi on many cylinder
that means valves are bent.

here is the SM quote step 4 belt install
WARNING If any binding is felt when adjusting the timing belt tension by turning the crankshaft, STOP turning the engine, because the pistons may be hitting the valves.
one can just throw an engine like that back together.
they also told you to set cam timing first, before pulling heads
or damage can happen,
but that depends on the event
belt snapped, jump cogs or just leaking head gasket.

Mar 02, 2017 | 2000 Isuzu Rodeo

1 Answer

P0300


which engine? there are many.
can be 50 things
300 means random misfire on all cylinders.
it really means all cylinder have weak HP, weak power, weak combustion energy levels !

The ecu actually measures crankshaft acceleration rates (geekspeak)
in lay terms this means (btw 300s never lie, it's REAL misfire)
there is one exception a loose timing belt or cam chain. can trip 300s.

in no order ever.

1: bad spark to all cyl.
2: low compression to all cylinders (cam timing off, melted CAT)
3: bad fueling to all. (EGR stuck wide open , engine stalls?)

but can be 50 things, so its best not to GUE$$
what we do is conduct simple tests.
first is do the 60,000 mile tuneup. do that its cheap, and works in most cases.
1: tuneup time.sparks and filters both. fuel and air.
2: compression test, and vacuum tests. at WOT,. both. ask for data.
3: check cam timing. if compression fails on all cyl.
4: i scan the ECU looking at fuel trim and closed loop working, ask.

Jan 19, 2014 | Toyota RAV4 Cars & Trucks

1 Answer

Idle speed to fast it variies up and down double


very likely your idle position sensor is bad. i would start there . are you showing any check engine lights on the dash? if so check which codes are showing up first as it could be other things as well like a dirty or bad MAP sensor or filiment, crank position sensor etc. ggod luck. the idle position sensor is fairly cheap and easy to replace if you have some basic tools.

Jun 20, 2010 | 2001 Ford Focus

1 Answer

2000 ford focus sedan 2.0 dohc ztec engine rear


check all battery leads and earth straps
"" car body and engen bay straps""
also check battery terminals are tight check its full of battery water too if its been low for a time bump it!
and have a ""drop meeter test"" done on the battery if its a bad battery it should show that up first time it could have cracked plates inside the battery its self, test by turning on head lights then hit starter, if every thing go's dead!!!! put ""good jump start"" battery on to car and try it again,,, all should work just fine then,,,,it could just be a flat battery?????

Oct 27, 2009 | 2000 Ford Focus

2 Answers

I have a 2005 ford ranger 3.0L with repetitive engine codes


these engines did have some exh valve issues, service bulletin 05-26-3. one other thing to verify is that the cam synronizer (CMP) is correctly installed. if its not right on, its way off.

Oct 14, 2009 | 2005 Ford Ranger

3 Answers

P0300 code reading on Chevy aveo. Engine light flashes and stays solid intermittently. While driving on the freeway, engine suddenly cut off. Tried to restart. Could hear the starter turning but engine...


Pull out your spark plugs. Change them if dirty. There might be a problem with the fuel trim, thats causing spark plug to foul up prematurely. A stucked open EGR valve can also cause a multiple mispfire code(P0300) but then it would be accompanied by an EGR code(P402) which means excessive flow detected. Anyways if was indeed a fouled up spark plug change them as well as the air filter.

Jun 30, 2009 | 2005 Chevrolet Aveo

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