bad backfire
!["Beemer Nut"'s Avatar](data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 50 50'><circle class='avatar-circle-default' fill='%23bc5285' cx='25px' cy='25px' r='20px'></circle><text class='avatar-text-default' x='49%' y='53%' fill='white' text-anchor='middle' alignment-baseline='middle'>"</text></svg>)
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
If you have a Fluke 87 or 88 digital meter they have the ability to read dwell, if not your local auto parts store. Have you watched your mechanical advance with a timing light? You should have a smooth repeatable advance. Yet you state it idles, to me sounds like carb related problems.
Last edited by "Beemer Nut"; Oct 23, 2006 at 04:26 PM.
Thread Starter
|
Senior User
Joined: May 2004
Posts: 398
Likes: 0
From: london, ontario
it's not the carb, i've got 2. i can turn the dist almost 90 degrees and doesn't sound much worse. i sprayed out the dist with some cleaner today, didn't make any difference. the vac advance seems to move ok, and there wasn't that much gunk in the dist, just some black dust. now i think the starter seleniod is going, when i turn the key it only moves a little then stops. i'll order one today and see if that helps? the +wire from the battery gets really hot quickly.lol i'm still looking for a timing light and a dwell meter.
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
I'm not familar with that 6 but a typical 6 has the intake bolted against the exhaust for heat transfer under the carb?
You may have a small hole burnt thru the exhaust manifold now it's entering into the intake. If so you'll run on idle until you throttle up when exhaust pressure increases as well exhaust flame that can ignite the intake charge.
This can drive you crazy until found.
You may have a small hole burnt thru the exhaust manifold now it's entering into the intake. If so you'll run on idle until you throttle up when exhaust pressure increases as well exhaust flame that can ignite the intake charge.
This can drive you crazy until found.
Thread Starter
|
Senior User
Joined: May 2004
Posts: 398
Likes: 0
From: london, ontario
Originally Posted by Beemer Nut
I'm not familar with that 6 but a typical 6 has the intake bolted against the exhaust for heat transfer under the carb?
You may have a small hole burnt thru the exhaust manifold now it's entering into the intake. If so you'll run on idle until you throttle up when exhaust pressure increases as well exhaust flame that can ignite the intake charge.
This can drive you crazy until found.
You may have a small hole burnt thru the exhaust manifold now it's entering into the intake. If so you'll run on idle until you throttle up when exhaust pressure increases as well exhaust flame that can ignite the intake charge.
This can drive you crazy until found.
thanks all
mark
Post Fiend
Joined: Dec 2003
Posts: 6,658
Likes: 4
From: "Islander"
We (dad and I) had this burn thru problem 35 years ago on the 56 Mercedes.
At 2:30 one morning in the shop blowing air thru the exhaust manifold with rags stuffed and tape across the other open ports air came thru the intake manifold. The cast iron exhaust manifold had a thin spot that rusted and burned thru, bolted above was the intake also rusted with a 1/16" hole.
When you throttled up or under load it popped thru the dual carbs.
One in ten million chance?
With a good idle the compression must be equal on all six cylinders with good valve sealing.
At 2:30 one morning in the shop blowing air thru the exhaust manifold with rags stuffed and tape across the other open ports air came thru the intake manifold. The cast iron exhaust manifold had a thin spot that rusted and burned thru, bolted above was the intake also rusted with a 1/16" hole.
When you throttled up or under load it popped thru the dual carbs.
One in ten million chance?
With a good idle the compression must be equal on all six cylinders with good valve sealing.
Last edited by "Beemer Nut"; Oct 25, 2006 at 11:20 PM.
Thread Starter
|
Senior User
Joined: May 2004
Posts: 398
Likes: 0
From: london, ontario
it changes, but will still run, and it might be a little closer to 75, how much play in the shaft should there be? i can turn this one about 1/3 of the flat on the shaft, but it doesn't wiggle sidewas.
mark
mark
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
Laughing Gas
Joined: Sep 2004
Posts: 1,169
Likes: 4
From: Whitby, Ontario, Canada
These engines did not use timing chain but rather gears as indicated. A common problem is for these distributors to shear the roll pin that holds the the driven gear to the distributors shaft. Pull the distributor and check it! Bad lifters could also cause this problem but check the dizzy first as it definitely sounds timing related.
Frank
Frank
Thread Starter
|
Senior User
Joined: May 2004
Posts: 398
Likes: 0
From: london, ontario
well it finally works. looks like it was the dist all along. it runs great, lots of power. now it's got the pertronics in it so i'm getting a better spark, rebuilt starter thats twice as fast as the old one, new carb, new plugs, ignitor 2 coil, new intake gasket, plus 2 new parking tickets from the mechanic.
over $1000 and all i needed was a $75 dist.
still need to find a timing light, and put on a new cap and rotor but no-one in town carries then, have to be ordered in, what a joke.
thanks for the help all.
mark
over $1000 and all i needed was a $75 dist.
still need to find a timing light, and put on a new cap and rotor but no-one in town carries then, have to be ordered in, what a joke.
thanks for the help all.
mark
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Watch the Canadian Tire flyer/web site for deals on tools .
They put a complete tune-up kit together in a nice case ..and put it on sale for christmas.
http://www.canadiantire.ca/home.jsp?...d6f9c89a846937
also Princess Auto gets Equus Products in sometimes.
http://www.princessauto.com/moreinfo...53092&SCAN=CAN
You can view both catalogues online
They put a complete tune-up kit together in a nice case ..and put it on sale for christmas.
http://www.canadiantire.ca/home.jsp?...d6f9c89a846937
also Princess Auto gets Equus Products in sometimes.
http://www.princessauto.com/moreinfo...53092&SCAN=CAN
You can view both catalogues online
Last edited by Mil1ion; Nov 9, 2006 at 04:00 PM.
Senior User
Joined: Oct 2006
Posts: 174
Likes: 0
From: Mountains of N. Montana
Originally Posted by marks69
well today i got it home, sorta.lol
changed the plugs, added some new gas, new fuel filter plus added an inline filter. sounds great till i touch the gas. still backfires bad with no power. it runs fine when cold, but when it heats up the problem starts. when it stops snowing i'll take the dist off and bring it inside to clean out. is carb cleaner ok for the inside the dist?
also would too much carb cleaner in the gas likely to cause this? there's a can in the back of the truck, and i don't know how it got there. there's only 1/4 of gas in the tank, and am not sure if the mechanic added it to my tank.
thanks all
mark
changed the plugs, added some new gas, new fuel filter plus added an inline filter. sounds great till i touch the gas. still backfires bad with no power. it runs fine when cold, but when it heats up the problem starts. when it stops snowing i'll take the dist off and bring it inside to clean out. is carb cleaner ok for the inside the dist?
also would too much carb cleaner in the gas likely to cause this? there's a can in the back of the truck, and i don't know how it got there. there's only 1/4 of gas in the tank, and am not sure if the mechanic added it to my tank.
thanks all
mark
Thread
Thread Starter
Forum
Replies
Last Post
10129
1973 - 1979 F-100 & Larger F-Series Trucks
4
Feb 9, 2015 03:39 AM
FordTroutCatcher
1973 - 1979 F-100 & Larger F-Series Trucks
3
Aug 5, 2012 08:08 PM
truckmano5-2
335 Series- 5.8/351M, 6.6/400, 351 Cleveland
10
May 4, 2004 12:56 AM
astamp78
Big Block V8 - 385 Series (6.1/370, 7.0/429, 7.5/460)
7
Sep 22, 2002 08:24 PM
