Are Burnt Valves Common in 302?
Thread Starter
|
New User
Joined: Apr 2005
Posts: 3
Likes: 0
Are Burnt Valves Common in 302?
I'm going on my second Bronco and in each case there is a "Burnt Valve" issue in regards to the 302. The weird thing is that on both engines it's the number 8 cylinder which impacts number 4. My first Bronco is an 84 and the one I'm getting this week is a 92.
Is this a common problem with the 302? This is my first post. I have always loved the Bronco. It is only now that I can finally drive the vehicle that I've always wanted. Talk about practical: 4 Wheel Drive, Carry 5 peeps, cargo room, a removeable top, up off the ground-so-things-move-slower and a body style that kills. Thanks for reading my thread.
Ray
Is this a common problem with the 302? This is my first post. I have always loved the Bronco. It is only now that I can finally drive the vehicle that I've always wanted. Talk about practical: 4 Wheel Drive, Carry 5 peeps, cargo room, a removeable top, up off the ground-so-things-move-slower and a body style that kills. Thanks for reading my thread.
Ray
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
The number 8 cylinder is known to get a higher amount of PCV return through it due to the location of the port on the intake being directly in line with the intake runner for this cylinder. This tends to cause this cylinder to build up with crud and foul plugs, burn rings, valves etc. more frequently than the rest of them. This is true of the 5.8 as well. Its been a while since I have read anything on it but I seem to recall a thread here or an article that discussed possible solutions to the problem OTHER than strict monitoring of the condition of the PCV valve. Unfortunately, I haven't got the links to them. I do know that this IS a concern for older (higher mileage) 302's and 351w's.
Speculation on my part would tend to make me think that possibly relocating the vacuum port for the PCV in the intake might be of some value. But my expertise is limited. you might want to pose this question in the small block V8 forum and see what responses you get.
Speculation on my part would tend to make me think that possibly relocating the vacuum port for the PCV in the intake might be of some value. But my expertise is limited. you might want to pose this question in the small block V8 forum and see what responses you get.
Senior User
Joined: Mar 2004
Posts: 497
Likes: 0
From: END OF THE OREGON TRAIL
Keep looking I remember reading about technical service bulletin for the fuel injected truck/van 302 with regard to the type of failures listed. Advised relocating PCV valve.
Last edited by 93BigBlackBronco; Apr 12, 2005 at 12:36 AM.
Posting Guru
Joined: Jun 2004
Posts: 1,371
Likes: 0
From: just outside of Phila.
Well, I've had both problems....the one with #7 & 8 wires crossing (easy fix obviously...just some wires looms) and burnt valves. I had a Jasper 302 do it to me, luckily just before the warranty ran out so it was taken care of quickly, but this was only after 60,000 miles. I'm told that's average to above average for how long a Jasper should last too.
Thread Starter
|
New User
Joined: Apr 2005
Posts: 3
Likes: 0
I'm grateful for you guy's getting back to me. I just bought a 92 Bronco XLT and she has high mileage as well. We're gonna put rebuilt heads on her and I'm gonna read up on relocating the PCV port. I really appreciate the feedback and I'm really glad that I joined the FTE forum.
Ray
Ray
Trending Topics
Lead Driver
Joined: Sep 2002
Posts: 9,182
Likes: 12
From: Gateway to the West
Broncocrazy,
With a high mileage 302, keep a close eye on the airbox UNDER the filter. When these engines age, the increased blow-by from worn rings tends to allow the breather filter under there and the lower portion of the airbox itself to take on noticable amounts of motor oil. Replacing the PCV valve will usually help at first but it eventually means engine overhaul. Not to scare ya, just some info so you can keep an eye on it.
With a high mileage 302, keep a close eye on the airbox UNDER the filter. When these engines age, the increased blow-by from worn rings tends to allow the breather filter under there and the lower portion of the airbox itself to take on noticable amounts of motor oil. Replacing the PCV valve will usually help at first but it eventually means engine overhaul. Not to scare ya, just some info so you can keep an eye on it.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
Elder User
Joined: Jan 2004
Posts: 552
Likes: 0
From: Northern, Va
Fuel inj. problems my acure also !!! after 100,000 I would change em out sumitt 215.00 19lbs new ford motor sports . That is what caused my valves to burn oil must be changed very often 2,500 miles & tune - up every 30,000 miles inc. pvc valve ! the only fuel inj. cleaner that works is BG 44K but its just a quick fix !!
Don
Don
Thread
Thread Starter
Forum
Replies
Last Post
Manofgod4life
1994.5 - 1997 7.3L Power Stroke Diesel
7
Feb 2, 2016 09:07 PM
awkoop
1987 - 1996 F150 & Larger F-Series Trucks
19
Jun 1, 2009 09:44 PM
