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Obd2 test shows #8 coil is bad. which one is #8 ????

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From the front of the engine looking back towards the gearbox left side is 1357...right side is 2468.(4x thumbs do you think???)

Posted on Oct 13, 2010

  • louiswhitney Oct 30, 2010

    This answer is NOT correct ! left side looking back towards gearbox is 1234 other is 5678
    2 out of 8 just isn't a 4Xthumbs!



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How do i check the trigger side of the ignition coil? what is all the things that will cause no spark at spark plugs boot?

What are the fault codes in memory for this problem, if you haven't run that test borrow an OBD2 code reader and do the test.

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How to find a misfire on a ford obd2

if you have a slight misfire and only get a P0300 random multiple misfire code here is a trick that i use. u will need to have a scanner with a "generic/global OBD2" setting. go into mode 6 and go to special tests and find test number 53. fi you find this you will see a special misfire counter and will show misfire history. clear the codes and get the misfire to come back. recheck this section in the scanner and you will see where that hidden misfire is. this trick is great for finding bad coil boots or water on the boots without going though the trouble of removing all the coils for Ford engines with coil-on-plug systems.

on Nov 19, 2010 | Ford F-150 Cars & Trucks

1 Answer

P0303 Code has been detected, I already change spark plugs for new ones, then I tested the coils by swapping them. I don't know what to do next. It might be an ingector??

what country? what engine, USA is 2.0L chain cam.
7 engine world wide,?
my wild guess is uSA as 2002 cars in many countries
have no OBD2. till later.. no 303 to show. my weak guess,....

it's means , ONLY that #3 misfires. ( P0303 not just spark )
there are lots of ways to misfire. huge.
but here they are. (some)
1: bad spark to #3 (cop? coil swapped, got 4 coils or 2 or ?)
no country stated, some have wasted spark with 1 cops per pair of cylinder i presume its 4 COP 4cylinder engines.
2: bad injection #3 (injector clogged or weak, or bad conn, to ECU.
3: weak compression to #3
4: coolant leaks to #3
5: valves sticking on #3 (or oil leaking past valve guides #3)
6:Does the spark plug re-foul, yes/no?
is that fouling (if true #3) oil , water, green, or fuel soaked?
color of spark tips are a huge clue, learn to read them.

in most cases, guessing never works, you need to do tests.
start with compression. at spec. all cylinders. are they equal.?
Does the strobe light show, misfire at idle?
is the fuel trim in OBD2 looking ok , near zero . Long term fuel trim.
"LTFT" mine runs -4% not -40 rich or +40 rich
are there only 303s, no others?
is the engine ECU holding closed loop at idle and light flat cruise?

you do ,know all engines have 1 weaker cylinder, (marginal)
and if fuel mix is off, the weakest cyl ,fails first
so ignoring fuel mix above, fails to find a real culprit.
closed loop. does closed loop hold?

keep in mind this.
the ECU detected a weak power stroke on #3.
it has no idea at all why , only that its 100% true ,that fact..
well, if the cam is not bouncing.... rare, if chain , common with belt drive. then that too can show misfire in very odd ways.
(cam and belt bias , facts are complex but can show up ,in odd ways. turn a cam head off, and feel that bias. this fact add to the belt or chain bounce and cat favor a cylinder or a tad weak one.)
so if the belt or chain bounces, oops. (the chain will yell , im bad)
didnt try to look up which motor you have., so chain or belt.
of stated suz. engine type.
2 liter? or 2.3L? j18/20/23? its called.
no miles stated, 100k ,300k? what?
the chains can fail about 120k, and the tell you,

the WIKI worldwide, shows
1.3 L I4; 1.5 L I4; 1.6 L I4; 1.8 L I4; 2.0 L I4; 2.3 L I4; 1.4 L Diesel I4

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1 Answer

I have a 03 ford explorer codes p0307 p0316 what could cause that injects good

You have to use Google to find your codes
& study OBD2 Systems
Forget the PO316
The PO 301 thru PO 308 are engine cylinder misfires
On a 2003 --11 year old ford veh you replace ALL
8 COP Ignition Coils
They only last about 6 to 7 years
Some will set a PO300 code
Some with set lots of codes even with just one bad coil
Some coils are so bad they will shut the engine off anytime
& any where under any conditions or temp
There are alos 3 or more ways to diagnose the coils
With no experience & over 7 years on them,buy all 8 coils
from Rock Auto & replace
Also the front Oxygen Sensors get replaced at 100,000
The last number as in your 307 is cylinder #7
Some fords you have
A,B,C,D,E, etc
1,2,3,4,5 etc
PO 301,302,303,304 etc
All 3 examples are the same thing or cylinders

Aug 10, 2013 | Ford Cars & Trucks

1 Answer

01 a6, cyl 1 2 3 show misfire on obd2 scan above idle,plugs wires coil injectors fuelfilter o2sensors allgood

What is the code you are getting? Have you checked the engines compression and all cylinders are in good shape? Do that test and get back to me.

Jun 16, 2012 | 2001 Audi A6

4 Answers

How to tell which of the 8 coils on a 1998 Pontiac trans-am ws-6 is bad?

This may help in some cases... At night turn all the lights off, wait a bit for your eyes to ajust to darkness, start the engine and look at your coils. Bad one will have a blue sparking inside. This solution does not work in all the cases though. But it is fast and easy. If you can't find a bad one like this then try to measure resistance of the primary for each coil because it could be a burned primary.

Mar 14, 2011 | Pontiac Firebird Cars & Trucks

1 Answer

Ok I was getting P0358 ignition coil H which i believed was cylinder8. I flipped the coil with cylinder7 now im getting code P0351 ignition coil A. Im still not exactly sure what those letters A & H...

Hello, the 300 Series is for plug misfires. The coil problem is designated a 350 Series. Your coils are lettered to follow the cylinder. 1=A, 2=B, 3=C, 4=D, 5=E. 6=F, 7=G and 8=H.

You started with a 350 Series+ 8 which means the coil on cylinder 8 is coil H. You flipped with cylinder 1 which shows a coil defect A. This means the defect followed the coil from H turning into A.

If it had been a plug problem it would have been a 300 Series like 301 for the first cylinder and 302 for the second, etc.

Test the coil, from 1 top contact to the bottom plug contact should be 10,000Ohms.

Feb 08, 2011 | 2003 Lincoln LS

2 Answers

How do you know if you have a faulty rear ho2s sensor and where is it located?

o2 sensors are located on the exhaust pipes
1-2 before the cataltic converters and 1-2 after the cat. converters. 4 cyl engine has 1 before and 1 after. 6 and 8 have 2 before and after mostly) to determine if they are bad it is best left to a repair facility to run a computer diagnostic test routine and or emissions system tests.

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2002 ford windstar showing obd2 codes po303,po304,po305 and idiling ruff and wont run over 45 mph and has low miles, how do i fix it ,thanks sincerely mark

might be the coil pack is bad, wires, plugs, o2 sensors, dirty injectors, catalic converter ( only if you smell rotten eggs ) . cylinders are misfireing.

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