You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, 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 free, fast and simple, so please join our community today!
I Have A 1990 Supercab 2wd With A 4.9 And A 5 Speed. When I First Got It I Changed The Plugs And Noticed The Old Plugs Were Loose. (Like 3 or 4 Were Finger Tight) I Put New Ones In And Was Rollin Smooth For A Month Or Two Till I Had ECM Problems. Mine Took A Crap And I Searched Salvage Yards High And Low For The Correct One. (It Has "CB" As The Last 2 Letters In The Part Number) I Ended Up Running For Like 3 Weeks With A Spare ECM From My Brother's 1993 Taurus 3.8 V6. My Truck Ran Rough And Was Weak On The Low End But Could Smoke The Tires Off With Higher RPM's. LOL. I Recently Got The Correct ECM (For An Automatic) And My Truck Still Ran A Little Rough But Much Better Than With The Bad ECM And The Taurus ECM. Until I Went To Give It A Tune Up. When I Went To Change Plugs I Noticed They Were Really Loose. So Instead Of Changing Them I Just Tightened Them Up And Took A Drive. All My Power Was Back And Not One Miss Or Hesitation And 20 MPG Again. But My Question To You Guys Is Why Were My Plugs Loose. I've Changed Plenty Of Plugs In My Lifetime And Have Never Had A Set Back Out On Me. I Dunno. Any Input Would Help. Thanks.
That happens with my 4.9 also. Always the rear one and sometimes the second to the rear one. I don't know why it happens, so I check them every once in a while.
__________________
Quote:
Originally Posted by Early Cuyler
Fights begin, fingerprints are took, days is lost, bail is made, court dates are ignored, cycle is repeated.
Yeah I have had plugs back out before, usually in a cast head application. If you torque the plugs properly they will not back out, though that can be fun with the room given on these though they are loads better than my s10 was.
yeah that happened to me to on my 4.9l. that pissed me off cause like you said ive worked on cars and never had that happen. i torqued mine this time and still no problem yet.... knock on wood...
__________________ 1993 F150 Super Cab 4.9l 5spd 4x4 128,000 miles
-31x10.5x15 BFG All Terrain tires 86 Bronco 4.9l 4spd granny -31x10.5x15 tires
-9in rear end
The Typing With Every Word Capitalized Is A Bad Habit That I Havent Been Able To Break. LOL. My Left Ring Finger Just Hovers Over The Shift Key Out Of Some Weird Habit I Aquired Somehow
also try getting a sparkplug thread chaser you can get them for about 7$ at an autoparts store or i seen for 4$ at a harbor freight tools. some1 told me it could have been something with the threads.
__________________ 1993 F150 Super Cab 4.9l 5spd 4x4 128,000 miles
-31x10.5x15 BFG All Terrain tires 86 Bronco 4.9l 4spd granny -31x10.5x15 tires
-9in rear end
Spark plugs Work Themselves Loose Over Time????
1993 F150 Super Cab 4.9l 5spd 4x4 128,000 miles
Linear Mode
