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#1035780 - 10/01/06 08:10 PM P0307 Cylinder #7 Misfire Detected
BritVicManUk Offline
Stranger

Registered: 09/25/06
Posts: 8
hello folks
well after a quick trip to advanced "oh no" parts in appleton the OBDII pulled P0307 cylinder 7 misfire detected
and i checked the plug which had carbon deposits on it(new set of plugs on 2 weeks ago) and the resistance in the injector is 15.9 ohms and haynes said that 13.5 to 19.0 is ok..still got that awful judder/shudder and 100% know that its that bloody cylinder #7..any tips before i march to the mechanic with my tail between my legs
cheers ian

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#1035781 - 10/01/06 08:22 PM Re: P0307 Cylinder #7 Misfire Detected
Modly Offline
Over the Hill

Registered: 08/05/06
Posts: 1437
Loc: Beaverton, OR
I had two problems with my #7 that caused it to misfire when I first had it.

My injector clip wasn't secured to the injector (Which I'm sure you've taken care of after testing impedence), and my spark plug boot had a small hole in it, and shorted out in the head, so it never got the spark to the plug.

Test out your wires, or swap two of them around, and see if it pulls a new code. *edit* Scratch that last part, I forgot that some of them use COPs, so it could be a faulty COP instead. Test it for spark with somebody else, and see if it will arc out on a metal surface. Test the boot out as well, and see if it is damaged.


Edited by Modly (10/01/06 08:28 PM)

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#1035782 - 10/01/06 08:25 PM Re: P0307 Cylinder #7 Misfire Detected
bamf70 Offline
n00b

Registered: 09/29/06
Posts: 12
Loc: Pennsylvania
Quote:

hello folks
well after a quick trip to advanced "oh no" parts in appleton the OBDII pulled P0307 cylinder 7 misfire detected
and i checked the plug which had carbon deposits on it(new set of plugs on 2 weeks ago) and the resistance in the injector is 15.9 ohms and haynes said that 13.5 to 19.0 is ok..still got that awful judder/shudder and 100% know that its that bloody cylinder #7..any tips before i march to the mechanic with my tail between my legs
cheers ian




I suggest you swap the COP off #7 and any other cylinder. Pull the - terminal on the battery for about 20 minutes then replace it (clears any codes in the ECM). Then start it up and when the CEL comes back on see if it the misfire follows the COP. If it does, just get a new COP and problem solved.
_________________________
02 Black GM

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#1035783 - 10/01/06 08:38 PM Re: P0307 Cylinder #7 Misfire Detected
BritVicManUk Offline
Stranger

Registered: 09/25/06
Posts: 8
ooops sorry lads but its the 95 vic which had the 2 coil packs so i guess the cop thingy is out of the question i guess and the plug wires where replaced 2 weeks ago when the problem started so other help maybe needed here

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#1035784 - 10/01/06 08:40 PM Re: P0307 Cylinder #7 Misfire Detected
bamf70 Offline
n00b

Registered: 09/29/06
Posts: 12
Loc: Pennsylvania
Quote:

ooops sorry lads but its the 95 vic which had the 2 coil packs so i guess the cop thingy is out of the question i guess and the plug wires where replaced 2 weeks ago when the problem started so other help maybe needed here



The idea is the same here. Swap the coil packs around if the misfire comes up again on plug #7 then the packs are good but if it jumps to a different cylinder than it's the coil pack.
_________________________
02 Black GM

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#1035785 - 10/01/06 08:40 PM Re: P0307 Cylinder #7 Misfire Detected
Modly Offline
Over the Hill

Registered: 08/05/06
Posts: 1437
Loc: Beaverton, OR
See if the coil end of the plug wires are all properly seated. They may not be connecting properly.

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#1035786 - 10/01/06 08:45 PM Re: P0307 Cylinder #7 Misfire Detected
Warren'74 Offline
Poobah

Registered: 06/13/02
Posts: 5363
Loc: Saskatoon, Sk. Canada
Re check the wires for proper resistance first. Replace plug, just because.

If that fails to solve it, do a compression test. Could be a broken valve spring.
_________________________
2004 CVPI - Ex RCMP Highway Patrol vehicle.

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#1035787 - 10/01/06 09:38 PM Re: P0307 Cylinder #7 Misfire Detected
Not_Gramps_Marq Offline
Over the Hill

Registered: 04/04/06
Posts: 1481
Loc: Southeastern, Wi
BritVicManUK - I just sent you a PM. I have the whole top end from a 95 so if you want to plan a day to come down we can go through it. I have lots of parts. look forward to hearing from you.
_________________________
1999 Marquis LS. K&N Cone, 90mm Lightning MAF, 04 ZIP tube, Ported and polished upper plenum, Pro Prod polished intake manifold,
EGR delete, custom 2.5 inch exhaust with catless X-pipe and Magnaflow Muffs,. Stage 2 J-Mod, AMMX driveshaft, 3.73 gears with modified limited slip.
2005 GT rims with 1.5inch spacers and 255 series rubber

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#1035788 - 10/01/06 10:13 PM Re: P0307 Cylinder #7 Misfire Detected
BritVicManUk Offline
Stranger

Registered: 09/25/06
Posts: 8
heh got yer PM and PM`d you back so lookng forward to it will get more details middle of week. heh warren i hope its not a valve spring as thats a pain in the arse aint it? aint got valve spring compressor

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#1035789 - 10/01/06 10:26 PM Re: P0307 Cylinder #7 Misfire Detected
Not_Gramps_Marq Offline
Over the Hill

Registered: 04/04/06
Posts: 1481
Loc: Southeastern, Wi
If it was a valve spring you'd more than likely have some noise. Here is what a broken Valve spring does:





you could have lost a cam follower. Which has been known to happen. Not too hard to fix though
_________________________
1999 Marquis LS. K&N Cone, 90mm Lightning MAF, 04 ZIP tube, Ported and polished upper plenum, Pro Prod polished intake manifold,
EGR delete, custom 2.5 inch exhaust with catless X-pipe and Magnaflow Muffs,. Stage 2 J-Mod, AMMX driveshaft, 3.73 gears with modified limited slip.
2005 GT rims with 1.5inch spacers and 255 series rubber

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#1035790 - 10/03/06 06:43 PM Re: P0307 Cylinder #7 Misfire Detected
BritVicManUk Offline
Stranger

Registered: 09/25/06
Posts: 8
heh mate
i pM`d you so go take a look and fingers crossed

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