Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)
Sign in using an external account
Register Forgot Password?


Welcome to Ford-Trucks Forums!
Welcome to Ford-Trucks.com.

You are currently viewing our forums as a guest, which gives you limited access to view most discussions and access our other features. By joining our community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join the Ford-Trucks Forums community today!





 
Reply
 
LinkBack Thread Tools Search this Thread
  #1 (permalink)  
Old 10-12-2005, 08:03 PM
Sgt_Pepper17 Sgt_Pepper17 is offline
Senior User
 
Join Date: Sep 2003
Posts: 212
Sgt_Pepper17 is starting off with a positive reputation.
302 misfire

My 302 is misfiring on cylinder 3. I replaced the wire to no avail (it did it on at all rpm's however, it needed wires anyhow.) I pulled the plug to find it black. I'm pretty sure that means that the motor is running rich, at least on that cylinder, however, even after cleaning the plug it still won't fire. I scraped the build-up off the cap and rotor, also to no avail. I'll prolly just replace the plugs, wires, and cap/rotor tomorrow, but wanted to know what you guys thought. One other thing, it smokes and the previous owner said that the compression was low on one cylinder which I believe to be cylinder 3. Thanks in advance.

Erik
Reply With Quote
  #2 (permalink)  
Old 10-12-2005, 10:48 PM
TigerDan's Avatar
TigerDan TigerDan is offline
Super Moderator
 
Join Date: May 2004
Location: The hills of No. Calif.
Posts: 11,717
TigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputation
Did you check for spark on that plug? It could be a bad plug, or a bad wire.

I'd do a compression test though, from what you say I think the problem may be mechanical rather than electrical.
__________________
"alot" is not a word...

Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.
Reply With Quote
  #3 (permalink)  
Old 10-12-2005, 11:20 PM
Sgt_Pepper17 Sgt_Pepper17 is offline
Senior User
 
Join Date: Sep 2003
Posts: 212
Sgt_Pepper17 is starting off with a positive reputation.
The guy I bought it from said that it had about 70 percent of what it should have compression wise. Not sure on an actual number because i'm not sure on compression ratio and whatnot. However, I will change the plugs tomorrow and get a new cap and rotor. I plan on swappin the motor but that could be a month or more away.

Erik
Reply With Quote
  #4 (permalink)  
Old 10-13-2005, 12:08 AM
TigerDan's Avatar
TigerDan TigerDan is offline
Super Moderator
 
Join Date: May 2004
Location: The hills of No. Calif.
Posts: 11,717
TigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputation
Even if that cylinder's dead, a month or so on 7 isn't too bad. 70% of what it's supposed to be is liveable. So, let's see what the tune up does for it. Keep us posted.
__________________
"alot" is not a word...

Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.
Reply With Quote
  #5 (permalink)  
Old 10-13-2005, 04:22 PM
Sgt_Pepper17 Sgt_Pepper17 is offline
Senior User
 
Join Date: Sep 2003
Posts: 212
Sgt_Pepper17 is starting off with a positive reputation.
well i'ld love to start it, I would, but the power steering line is off at the pump but won't come out at the box. I'm thinking about just screwin it back in the top and starting it but i decided to cook some chili to cool down... the chilli's good though. Oh and thanks for the suggestion.

Erik
Reply With Quote
  #6 (permalink)  
Old 10-13-2005, 06:28 PM
TigerDan's Avatar
TigerDan TigerDan is offline
Super Moderator
 
Join Date: May 2004
Location: The hills of No. Calif.
Posts: 11,717
TigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputationTigerDan has a superb reputation
Or you could pull the power steering belt off and start it.
__________________
"alot" is not a word...

Political Correctness is a doctrine, fostered by a delusional, illogical minority, and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.
Reply With Quote
  #7 (permalink)  
Old 10-13-2005, 08:40 PM
Sgt_Pepper17 Sgt_Pepper17 is offline
Senior User
 
Join Date: Sep 2003
Posts: 212
Sgt_Pepper17 is starting off with a positive reputation.
Yeah, but I don't like to start two things at once. Got the new hose on now, changed the plugs and wires, however, the cap I got at farm and fleet is the wrong one. I'm headed back right now to get the right one.

Erik
Reply With Quote
Old 10-13-2005, 08:40 PM
Reply

Go Back   Ford Truck Enthusiasts Forums > Performance, Engines & Troubleshooting > Small Block V8 (221, 260, 289, 5.0/302, 5.8/351W)

Tags
1968, 302, ford, misfire, missfire

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On
Forum Jump



All times are GMT -5. The time now is 05:04 PM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
SEO by vBSEO 3.5.2 ©2010, Crawlability, Inc.
Advertising - Terms of Use - Privacy Statement - Jobs
This forum is owned and operated by Internet Brands, Inc., a Delaware corporation. It is not authorized or endorsed by the Ford Motor Company and is not affiliated with the Ford Motor Company or its related companies in any way. FordŽ is a registered trademark of the Ford Motor Company.

vbulletin Admin Backup