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Miss fire #7 cil - F-150 Ford Cars & Trucks

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engine?

Misfire is usually a spark plug, plug wire , (COP) Coil

Posted on May 26, 2011

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1 Answer

Miss fire#7


in the codes for misfire there is also an injector and fuel pressure result . It is not always the plug and coil. have a fuel pressure test done as well and have the injectors and electrical connection checked.

Dec 04, 2013 | 2003 Jaguar S-Type

1 Answer

Can't get number 2 cyclinder to fire. See spark when I pull the wire off. Looks the same as number 3 but can't tell if its fuel injector issue or not enough spark?


Have you switched the spark plugs to see if it is a bad plug ?
Switching the plug in cyl 2 with another cyl will tell you if the plug is bad if the problem moves to the other cyl.
It takes alot more voltage to fire a plug in a compressed cyl than it does out in the open. If the plug is fuel soaked it will never fire.

Jun 26, 2012 | 1997 Chevrolet Cavalier

1 Answer

Idling #5 and #7 miss fire. holding it at 2000 rpms makes all 8 miss fire. its running really rich and the only code its showing is P0300 which is engine miss fire. have replaced plugs wires cap and...


When there is an engine misfire it could be gas or spark related. Or, the oxygen sensor may not be operating correctly, which controls fuel supply.

If there is a 'random misfire' then it could be an oxygen sensor causing the problem, as well, causing a rich mixture.

Good luck on this repair.

Jan 30, 2011 | GMC K1500 Cars & Trucks

1 Answer

I have a Lincoln ls v8 2001 and my #7 spark plug is miss firing. i need to know the way they fire so i can change that one.


Driver side on 3.9 V8 --5-6-7-8
Second from back is COP #7
Should have a code PO307 with MIL light lit, on dash

Just bought a coil on Wed. Airtex 5C1179 $48.64 at auto parts store.
Also did #7 on mine in march this year

Jun 24, 2010 | 2001 Lincoln LS

2 Answers

Missing after replacing spark plugs


What size engine? Check the gap on the plugs as well. "pregapped" is not always right

Feb 18, 2010 | 1991 Oldsmobile Cutlass Ciera

2 Answers

Spark plug wiring diagram for 98 tahoe car is missing need to know which wire goes were


You didn't post your engine size so please pick the applicable diagram:


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1996-98 4.3L Engines Firing Order: 1-6-5-4-3-2Distributor Rotation: Clockwise


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1996-98 5.0L, 5.7L and 7.4L Engines Firing Order: 1-8-4-3-6-5-7-2Distributor Rotation: Clockwise



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4.3L Engines Firing order: 1-6-5-4-3-2 Distributor rotation: Clockwise


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4.8L, 5.3L and 6.0L Engines Firing order: 1-8-7-2-6-5-4-3 Distributorless ignition system (one coil on each cylinder)


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5.0L, 5.7L and 7.4L Engines Firing order: 1-8-4-3-6-5-7-2 Distributor rotation: Clockwise

Feb 14, 2010 | 1998 Chevrolet Tahoe

1 Answer

2.5 tdi 5 cil. is good?


Audi A6 2,5 TDI 5 cil is a great car. The engine is one of Audi's most tested engines. But models before '96 will rust quite a bit, if you dont look af it. So look for rust and be sure that the drive-belt is replaced in time.

Feb 09, 2010 | 1995 Audi A6

1 Answer

Engine misfiring cylinder #3


Hi there;
I have run into an issue with these engines miss-fireing on #3 before.
You may want to have you tech check the miss-fire count for #3 & #7 on his/her scanner, THe distributor cap on these engines is made so the spark for #3 crosses over the path of #7 & they sometimes mix & become one. What happens then is they may be fooled by a spark coming through the wire if on a test lead but won't send the spark to the cylinder. The spark always goes to the easieat place so when cyl.#3 is ready to fire it is easier for the spark to go to #7 & vice-versa, So you tech will see a constant miss-fire on #3 & an intermitant missfire on #7. they can ceck the cap by pulling #3 plug wire off the distributor cap while the truck is running & there will be no spark, if he puts #3 back on & pulls #7 off there will be no spark there. the computor will only set a #3 miss-fire code because that is the cylinder that miss-fires the most.
If they find that is O/K you will want to have them do a compression test. If they find the compression is conciderably lower on cylinder #3 than the rest the camshaft theory is plausable.
The next step will cost you some money but it will tell you if you have an injector issue. You will have to pay you tech about 3.0 hrs to do this & you can just have them replace the #3 injector & hope it works. But they are around $200.00 rebulit so thats alot of money to throw at a hope. You'll need to get them to swap the #3 injector with the injector from one of the other cylinders then run the engine. if the miss-fire moves to the other cylinder you know you have an injector issue.

I hope this helps, Good luck, please let me know how you make out.
Farrout!

Mar 19, 2009 | 1999 Chevrolet Tahoe

1 Answer

Engine miss fire


If this is a truck with The coil on Plug setup, I would suggest replacing the #7 ignition coil and the plug.

Aug 09, 2008 | 2000 Ford F150 Flareside SuperCab

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