4 valve too clean - Forums at Modded Mustangs
 
LinkBack Thread Tools
post #1 of 17 Old March 30th, 2008, 08:59 PM Thread Starter
Regular
 
Join Date: Mar 2008
Location: Nazareth, Pa
Posts: 193
 
iTrader: 0 reviews
4 valve too clean

So I had purchased a 93 GT with a intake backfiring problem and after checking the timing, wiring order, injectors, fuel pressure and rocker nuts, I pulled all the plugs and they all look like normally used plugs but on the #4 valve, it is clean an smells of unburned fuel. Does anybody have any suggestions...I will take any and all at this point, thanks. -Matt-
1982matthew is offline  
Sponsored Links
Advertisement
 
post #2 of 17 Old March 30th, 2008, 09:15 PM
MM Fanatic
 
ryans88gt's Avatar
 
Join Date: May 2007
Location: Bloomington, IL
Posts: 4,781
     
iTrader: 0 reviews
bad injector? bad plug or wire?

88 GT CHI headed 351w 10.8 @ 125 - still figuring it out.
03 Cobra 2.3 whipple 10.7 @ 129 - sold it
04 Mach 1 12.7 @ 109 mostly stock - sold it
89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

ryans88gt is offline  
post #3 of 17 Old March 30th, 2008, 10:38 PM
MM Fanatic
 
fogged306's Avatar
 
Join Date: Apr 2007
Location: NY
Posts: 4,875
     
iTrader: 2 reviews
Probably not an injector if it smells like fuel. I second the bad plug or wire, maybe bad cap too.

and if you're reading this again ryan... why?? I'm sure you did the avie for the camaro guys, but what did we ever do to you?!
fogged306 is offline  
Sponsored Links
Advertisement
 
post #4 of 17 Old March 30th, 2008, 10:45 PM Thread Starter
Regular
 
Join Date: Mar 2008
Location: Nazareth, Pa
Posts: 193
 
iTrader: 0 reviews
wires, plugs and cap and rotor all ford new......
1982matthew is offline  
post #5 of 17 Old March 30th, 2008, 10:55 PM
MM Fanatic
 
fogged306's Avatar
 
Join Date: Apr 2007
Location: NY
Posts: 4,875
     
iTrader: 2 reviews
have you checked for spark at the plug?
fogged306 is offline  
post #6 of 17 Old March 30th, 2008, 10:59 PM
MM Fanatic
 
nolife's Avatar
 
Join Date: Dec 2006
Posts: 3,659
Blog Entries: 3
     
iTrader: 0 reviews
Attach a timing light on your #4 wire and see if it is firing. The injector could be leaking. Do you notice any fuel smell in the oil or is your oil seem thin?

nolife is offline  
post #7 of 17 Old March 31st, 2008, 12:04 AM
MM Fanatic
 
ryans88gt's Avatar
 
Join Date: May 2007
Location: Bloomington, IL
Posts: 4,781
     
iTrader: 0 reviews
Quote:
Originally Posted by fogged306 View Post
Probably not an injector if it smells like fuel. I second the bad plug or wire, maybe bad cap too.

and if you're reading this again ryan... why?? I'm sure you did the avie for the camaro guys, but what did we ever do to you?!
I changed it just for you, you homophobe

88 GT CHI headed 351w 10.8 @ 125 - still figuring it out.
03 Cobra 2.3 whipple 10.7 @ 129 - sold it
04 Mach 1 12.7 @ 109 mostly stock - sold it
89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

ryans88gt is offline  
post #8 of 17 Old March 31st, 2008, 12:22 AM
MM Fanatic
 
fogged306's Avatar
 
Join Date: Apr 2007
Location: NY
Posts: 4,875
     
iTrader: 2 reviews
Homophobe?? I wanted you to change it because my pants got tight every time I read one of your posts!
fogged306 is offline  
post #9 of 17 Old March 31st, 2008, 12:25 AM
MM Fanatic
 
ryans88gt's Avatar
 
Join Date: May 2007
Location: Bloomington, IL
Posts: 4,781
     
iTrader: 0 reviews

88 GT CHI headed 351w 10.8 @ 125 - still figuring it out.
03 Cobra 2.3 whipple 10.7 @ 129 - sold it
04 Mach 1 12.7 @ 109 mostly stock - sold it
89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

ryans88gt is offline  
post #10 of 17 Old March 31st, 2008, 12:29 AM
MM Fanatic
 
fogged306's Avatar
 
Join Date: Apr 2007
Location: NY
Posts: 4,875
     
iTrader: 2 reviews
Quote:
Originally Posted by ryans88gt View Post
Oh stop... everybody knows you swallow, you're not foolin' anyone
fogged306 is offline  
post #11 of 17 Old March 31st, 2008, 12:33 AM
MM Fanatic
 
ryans88gt's Avatar
 
Join Date: May 2007
Location: Bloomington, IL
Posts: 4,781
     
iTrader: 0 reviews
Nah I prefer to have my face painted.

88 GT CHI headed 351w 10.8 @ 125 - still figuring it out.
03 Cobra 2.3 whipple 10.7 @ 129 - sold it
04 Mach 1 12.7 @ 109 mostly stock - sold it
89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

ryans88gt is offline  
post #12 of 17 Old March 31st, 2008, 12:38 AM
MM Fanatic
 
fogged306's Avatar
 
Join Date: Apr 2007
Location: NY
Posts: 4,875
     
iTrader: 2 reviews


ok I'm done spamming this poor bastards thread.
fogged306 is offline  
post #13 of 17 Old March 31st, 2008, 02:11 PM Thread Starter
Regular
 
Join Date: Mar 2008
Location: Nazareth, Pa
Posts: 193
 
iTrader: 0 reviews
I am a poor bastard.....I can't fix my problem, got spark and oils fine also changed the injectors and still no good.
1982matthew is offline  
post #14 of 17 Old March 31st, 2008, 03:00 PM
MM Fanatic
 
ryans88gt's Avatar
 
Join Date: May 2007
Location: Bloomington, IL
Posts: 4,781
     
iTrader: 0 reviews
If it smells of unburned fuel you are looking at an ignition problem I guess. You have confirmed spark at the problem cylinder?

88 GT CHI headed 351w 10.8 @ 125 - still figuring it out.
03 Cobra 2.3 whipple 10.7 @ 129 - sold it
04 Mach 1 12.7 @ 109 mostly stock - sold it
89 LX procharged 302 515 hp 497 ftlbs 10.7 @130 mph - sold it

ryans88gt is offline  
post #15 of 17 Old March 31st, 2008, 04:56 PM Thread Starter
Regular
 
Join Date: Mar 2008
Location: Nazareth, Pa
Posts: 193
 
iTrader: 0 reviews
i can pull that plug out and put it in the wire and lay it against metal and i get spark, i am so puzzled right now.....working on cars everyday and not being able to figure this out is pissing me off...
1982matthew is offline  
post #16 of 17 Old March 31st, 2008, 05:36 PM
MM Fanatic
 
fogged306's Avatar
 
Join Date: Apr 2007
Location: NY
Posts: 4,875
     
iTrader: 2 reviews
If you pull the #4 plug wire and run the car, does the backfire stop? Maybe you have more than one problem on your hands. From my experience, backfire will only happen if you have a bad intake gasket, or your intake valve is bent, or the intake valve is open at the wrong time (timing), maybe I'm missing a thing or two there, but those are all I've seen.
fogged306 is offline  
post #17 of 17 Old March 31st, 2008, 06:51 PM Thread Starter
Regular
 
Join Date: Mar 2008
Location: Nazareth, Pa
Posts: 193
 
iTrader: 0 reviews
thanks for suggesting that I didn't take notice I will try that and see. Its pouring right now so I will have to check it tomorrow.
1982matthew is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Forums at Modded Mustangs forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
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:
OR

Log-in










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



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