misfire and plug removal

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misfire and plug removal

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misfire and plug removal - 12/28/2007 5:20:55 AM

zerochills

Posts: 73
Joined: 4/12/2007
Status: offline

Had a misfire code on cyl. #5 shortly after replaceing plugs and wires. Plugs where iridiums and not sure of wire brand (cost near $100). Since then I have ordered the magnacore wires and got a set of bosch plat 4's which I plan to replace this weekend. In addition I have also done the throttle body cleaning recently and the seafoam treatment.

Question- when inspecting the plug in #5 I noticed it was unusually difficult to break free and continued to be tight while removing. The motor was not warm so I do not believe expansion was an issue. Honestly can not remember if I used any anti seize or not. Hope all are not as difficult. Any suggestion for easier removal if they are???

Also, just this week noticed truck starting to idle much ruffer than it had been, have not had a chance to get codes read yet. Could this be related to the misfire and is it typical for it to get rougher as time goes on?

Thanks

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2000 Land Rover Disco II
2003 Volvo S40
2003 Jaguar X Type

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RE: misfire and plug removal - 12/28/2007 7:10:55 AM

jkid

Posts: 597
Joined: 9/26/2007
Status: offline

I'm not really sure why they tell you to remove plugs when the engine is cold. I have always found it to be much easier to get stuck plugs out with a warm engine. I guess a warm engine could free them up - a hot engine might cause expansion issues though. Make sure to use anti-seize.

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01 D2 SE (90K miles) Stock For now
1982 Mercedes 300SD (270k miles)

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RE: misfire and plug removal - 12/28/2007 7:15:55 AM

Disco Mike

Posts: 10489
Joined: 4/27/2006
Status: offline

Once you get that plug out, I would inspect the threads for metal filings and re lube it. If it doesn't go back in easy from the start remove it and run a thread chaser the the plug hole. In the future, I wouldn't replace a plug without proper plug lube.
Also, do not change out your plugs untill after you have replaced your wire, if you are still having a problem call me before change the plugs. I am currently using Bosch Uridum plugs and really like them, prior to that I put 65,000 miles on a set of Plus 4's that I swear by, they were super.

< Message edited by Disco Mike -- 12/28/2007 8:38:28 AM >

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Mike
Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers.
99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45.

(in reply to jkid)

Post #: 3

RE: misfire and plug removal - 12/28/2007 7:20:46 AM

S4poor

Posts: 241
Joined: 8/8/2007
From: Loveland, Colorado (Heaven)
Status: offline

quote:

Also, just this week noticed truck starting to idle much ruffer than it had been, have not had a chance to get codes read yet. Could this be related to the misfire and is it typical for it to get rougher as time goes on?

Thanks

Are the plugs gapped properly?

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'04 Disco SE II 50k miles.
Needs more mountians.

'02 Audi S4 with a few extras ;-)

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Post #: 4

RE: misfire and plug removal - 12/31/2007 7:08:08 AM

zerochills

Posts: 73
Joined: 4/12/2007
Status: offline

Changed plugs and wires on Saturday, only #5 was tough to remove all others came out like they should. Truck runs much better, misfire codes gone!. However I heard a nock which had not been present prior to changing plugs, any relation? Still have code P0304 and P0305. Going to change out Oxygen Sensors next weekend and should remove those codes. P1590 still remains, any ideas?

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2000 Land Rover Disco II
2003 Volvo S40
2003 Jaguar X Type

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Post #: 5

RE: misfire and plug removal - 12/31/2007 8:05:58 AM

Disco Mike

Posts: 10489
Joined: 4/27/2006
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Who's plugs and wires did you use, what plug gap did you use?
304 and 305 are mis fires related to either plugs or wires, unless your engine is so carboned up that the carbon is causing the misfire and knock.
How many miles on the engine?
The 02's will not cure the misfires.

_____________________________

Mike
Retired service manager. Member of the Solihull Society, NCLR club,past member of the SCLR club and Santa Barbara 4 Wheelers.
99 D2, 3" lift, lockers, H.D. axles, 4:11 gears, Custom front and rear bumpers, Warn winch, HID lights and an Engel 45.

(in reply to zerochills)

Post #: 6

RE: misfire and plug removal - 12/31/2007 8:44:42 AM

zerochills

Posts: 73
Joined: 4/12/2007
Status: offline

my apologies Mike, posted wrong codes. Codes I still have are P0154 and P0155, which O2 sensor should fix.
The knock is a new concern however.
I used Bosch Plat. +4 and Magnacore wires.

2000 Disco w/ 136000

Thanks

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2000 Land Rover Disco II
2003 Volvo S40
2003 Jaguar X Type

(in reply to Disco Mike)

Post #: 7