Spark Plug pictures showing??? - Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z
User Tag List

Closed Thread
 
LinkBack Thread Tools
#1 (permalink) Old 05-14-2006, 05:01 PM
mjz
Senior Member
 
Join Date: Mar 2005
Posts: 481
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Spark Plug pictures showing???

Below are pictures of my spark plugs removed shortly after the car went into its lousy idle mode and stalled several times. Re-start was full of gasoline smell and eventually the smell went away, but the idle was still bad.

Can you tell anything from the spark plugs based on your experience. The order of the plugs are #6 on the left, number 1 is on the right (1= front of engine - 6 = rear)

When I pull off the main vacuum hose to the VCM so air enters directly into the intake manifold, the rpm's rise quite a bit (800-900 rpm) but the engine is not steady (understandable).

I think I have a rich condition, but I was surprised that only one spark plug showed any signs of that.

Anything else the spark plugs are telling you?





Post Edited (May 14, 2:05pm)

1983 280Zxt w/57,000 miles
Stock engine - Energy Suspension front-end restore, KYB struts
mjz is offline  
Sponsored Links
Advertisement
 
#2 (permalink) Old 05-14-2006, 05:03 PM
Senior Member
 
Join Date: Oct 2004
Posts: 810
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Re: Spark Plug pictures showing???

hmmm



Post Edited (May 14, 2:04pm)
whitezster is offline  
#3 (permalink) Old 05-14-2006, 05:31 PM
Senior Member
 
Join Date: Mar 2000
Posts: 4,236
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Re: Spark Plug pictures showing???

My opinion 1 is starting to lean 2 is rich 3 is lean 4 is lean 5is ok 6 is lean

how are your injectors? .. 2 might be stuck and the rest ok, making the AFM off.. but then there are number of other condition that can cause this.

assuming your vacuum system would work like it should. i would go for injectors.



Post Edited (May 14, 2:32pm)

My drinking team has a racing problem

www.facebook.com/rmrmotorsport


if you are fully in control, you are not driving fast enough!


79 ZXR 406 SBC 532HP 745NM 6 speed caged lsd coiled etc etc
78 ZX isma Widebody jackstand (project eternity)
E36 GTR full race M5 v8 money pit
frank280zx is offline  
#4 (permalink) Old 05-14-2006, 06:42 PM
Senior Member
 
Join Date: Mar 2005
Posts: 1,585
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Re: Spark Plug pictures showing???

Those are odd numbers and letters on the plugs....I've only seen BPR6ES or 7 or 8 but its alwas BPR#ES


1998 Outback Limited

1984 Datsun 300ZX NA
fairladyVT is offline  
#5 (permalink) Old 05-14-2006, 10:03 PM
Senior Member
 
Join Date: Jun 2005
Posts: 1,941
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Re: Spark Plug pictures showing???

2 n 5, 5 appear to be the biggest offender, I would replace those n see what happens


..and like a man with a tiger outside his gate
He not only couldnt relax, but he couldnt relate..















t5turbo is offline  
#6 (permalink) Old 05-15-2006, 12:56 AM
Senior Member
 
Join Date: May 2001
Posts: 4,289
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Re: Spark Plug pictures showing???

Since the pic has the plugs shown left to right 6, 5, 4, 3, 2, 1.

Put plug 6 in cyl # 4.

Put plug 5 in cyl # 3.

Put plug 4 in cyl # 6.

Put plug 3 in cyl # 5.

Put plug 2 in cyl # 1.

Put plug 1 in cyl # 2.

Start the engine and take it for a 30 to 45 min ride on a freeway and return home, let the engine cool a bit and pull the plugs. Now take another picture showing left to right 6, 5, 4, 3, 2, 1.

Do not touch or mess with anything else at this point.




Wayne Monteath
Masham, Quebec.
1979 280ZX 2+2
1981 280ZX 2+2
79-280-ZX is offline  
#7 (permalink) Old 05-15-2006, 08:21 AM
mjz
Senior Member
 
Join Date: Mar 2005
Posts: 481
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
(Thread Starter)
Re: Spark Plug pictures showing???

Will do ... I thought about doing that - but the order is interesting.


1983 280Zxt w/57,000 miles
Stock engine - Energy Suspension front-end restore, KYB struts
mjz is offline  
#8 (permalink) Old 05-15-2006, 10:53 AM
Senior Member
 
Join Date: Mar 2000
Posts: 4,236
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Re: Spark Plug pictures showing???

hmm and ?


My drinking team has a racing problem

www.facebook.com/rmrmotorsport


if you are fully in control, you are not driving fast enough!


79 ZXR 406 SBC 532HP 745NM 6 speed caged lsd coiled etc etc
78 ZX isma Widebody jackstand (project eternity)
E36 GTR full race M5 v8 money pit
frank280zx is offline  
#9 (permalink) Old 05-15-2006, 01:01 PM
Senior Member
 
Join Date: Apr 2005
Posts: 315
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Re: Spark Plug pictures showing???

looks like your fuel injectors or connectors are starting to take a dump. How old are they? Try cleaning all of your electrical contacts first. If that doesn't do it you should try replacing the cap and rotor. If not, Probably the injectors.


- Raleigh

78 280Z, 4 spd. Manual, NGK plugs and wires, GP Sorenson Injectors, CAI, Memphis Audio speakers, Pioneer head unit, Kicker L5 sub, custom rust holes
karioth is offline  
#10 (permalink) Old 05-15-2006, 02:13 PM
Senior Member
 
Join Date: Jul 2000
Posts: 2,910
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
Re: Spark Plug pictures showing???

karioth... you stole what I was going to say...

one other thing though... if cleaning the connectors doesn't fix it.... you can always clean the injectors yourself with a small screwdriver and some carb cleaner.

Or, since the car is actually running, you could just spray half a can of carb cleaner into the gas tank.... drive it for a while, then let it sit.... that method seems to clean the injectors really well also.

But be prepeared to possiblly having to replace the fuel filter. Carb cleaner is good about freeing up any sludge that may be in your tank or lines.

It will also clean off any carbon/sludge buildup in the head.


'81 280ZX-N/A 2+2 - stolen on 11-9-2006 :-( - recovered 11-13-2006 :-D
'77 280 - now back to being my project car.
'76 280 2+2 - parts car - slowly being stripped
Ethan is offline  
Closed Thread

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Nissan : Datsun ZCar forum :Nissan Z Forum: 240Z to 370Z forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



  Similar Threads
Thread Thread Starter Forum Replies Last Post
Spark Plug Pictures - What can be concluded? nukebrewer 70-83 Tech Discussion Forum 5 07-29-2009 06:45 PM
Spark plug gap.. Ricter 70-83 Tech Discussion Forum 15 01-24-2005 06:29 PM
posted 4 pictures they not showing HELP! Delirious Kustom Car Talk Forum 5 07-15-2003 12:01 PM
What is the best spark plug wires and spark plugs 350zhawaii 350Z Tech Discussion Forum 3 04-23-2002 09:54 AM
Faint spark at #3 spark plug BOB 84-89 Tech Discussion Forum 3 02-04-2000 11:20 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome


Content Relevant URLs by vBSEO 3.6.0 PL2