severe pinging problem
Thread Starter
|
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
severe pinging problem
My 390 pings most of the time. I used to have a 2bbl and like no problems and now i have a edelbrock 600 and the motor runs to damn lean. I swaer it causes most of the pinging. I have turned my timing down from 10 to 4 and ran 92 or octance booster on 89 octane and its no better. I had a fuel problem before of not getting enough gas but i have a new filter, pump, and line. The temp runs on n of normal down the road but on h when idleing. I have about 3k on a rebuild. I have milled d2te aa heads with fel pro gaskets. I don't think the deck has been milled. I need to do whatever i can to richen the a/f mixture. I 'm going to cut off as much air as possible. I'm going to put my snorkel back on and maybe dissconnect the secondaries. I believe they are vacumm activated but every little bit helps. I have the 2 adjustments screws turned out to like 2.5 turns and i might turn to out more yet but most people say thay are for idle and low speed only. I haven't checked my vaccum advance at more then idle so i don't know if its a problem or not. Any suggestions are greatly appreciated or ask me any question that you have about my setup
Thanks.[SIZE=3]
Thanks.[SIZE=3]
Thread Starter
|
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
i ran it without a the vaccum advance hooked up and it ran like a champ. Is it bad to drive with the line plugged and what are the possible problems. I mean would buying a new advance on the distributor work or is it a leak or manifold problem?
Cargo Master
Joined: Aug 2000
Posts: 2,931
Likes: 12
From: SW Michigan
pinging
The vacuum advanse helps with fuel economy. I wouldn't be running without one, for that reason. But there are lots of guys who don't use the vacuum. There are several differant vacuum cans available, and some are even adjustable. You might need a can that adds less advance. Also when you had the 2 barrel, where was the vacuum hooked up ? If you changed from ported to manifold vacuum when you switched carbs, you might have the problems like you are experiencing now. I like full manifold vacuum on the dizzy, but your tune-up has to allow for that. Keep in mind that Edelbrock has had some problems with quality control on those carbs, we ( the shop I work for ) have several that were just not usable. DF
Junior User
Joined: Jul 2001
Posts: 61
Likes: 0
From: Rockwall, Just East of Da
I am also dealing with a severe pinging problem with my 1976 390 4V. A previous owner had installed a Holley 4160 carb that apparently causes the motor to run much leaner that the stock carb. After receiving some excellent advice on this forum I installed an crane adjustable vacuum advance kit from Summit. It cost 29.95 plus shipping was very easy to install and adjust. Pinging problem is now gone when running factory spec 12 degree static adcance and 89 octance gas. I also plan on rejetting the carb in the next week or two. When I do this I plan on running regular unleaded (87 octane) without any pinging problems whatsoever.
It really is nice to drive the truck without that horrible noise coming from the engine during moderate acceleration.
let me know if you have any other questions. I learned quite about ignition timing dealing with this problem and feel alot more comfortable tunning an engine now.
Mark
It really is nice to drive the truck without that horrible noise coming from the engine during moderate acceleration.
let me know if you have any other questions. I learned quite about ignition timing dealing with this problem and feel alot more comfortable tunning an engine now.
Mark
Thread Starter
|
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
so mark you bought the crane adjustable vacuum advance and all is good. So you are running at 12 btdc. I just don'tknow what the deal with switching to 4bbl but the trucks don't like it i guess. That price was good since i got a price quote a new vacuum advance at the auto parts store and it was $40 and i was a smart *** and asked about the whole damn distrib and its $55. I think i will order that crane piece today or tomorrow. Thanks guys.
Logistics Pro
Joined: Jun 2003
Posts: 3,919
Likes: 271
I have found that on Edelbrock, (Carter) carbs, the vac port has way too much vacuum as soon as the throttle plates are open. Put a vacuum gauge on the port and see how much you've got at idle. Also, throw a timing light on it and gradually open the throttle and see how soon you get max advance. Probably gonna need the adjustable advance.
________________________
63 Unibody 390 c6
62 Uni Shorty 292
67 Fastback 390 4-speed
________________________
63 Unibody 390 c6
62 Uni Shorty 292
67 Fastback 390 4-speed
Trending Topics
Post Fiend
Joined: Feb 2000
Posts: 5,130
Likes: 8
From: Brea CA
Originally posted by instig8r63
I have found that on Edelbrock, (Carter) carbs, the vac port has way too much vacuum as soon as the throttle plates are open.
I have found that on Edelbrock, (Carter) carbs, the vac port has way too much vacuum as soon as the throttle plates are open.
Barry
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
10 Most Surprising 2026 Ford Truck Features!
Joe Kucinski
Top 10 Ford Trucks Coming to Mecum Indy 2026
Brett Foote
5 Best / 5 Worst Ford Truck Wheels of All Time
Joe Kucinski
Ford Super Duty: 5 Things Owners LOVE, 5 Things They LOATHE!
Joe Kucinski
Every 2026 Ford Truck Engine RANKED from WORST to FIRST!
Michael S. Palmer
The Best F-150 Deal of Every Trim Level (XL through Raptor)
Joe Kucinski
More Turbo
Joined: Oct 2003
Posts: 632
Likes: 15
From: Fairbanks, Alaska
Mark, Is the kit you purchased part number CRN-99607-1 ?
I have a 390 with a Holley 4160 and it seems to ping pretty bad. I just got the truck a few days ago and have been playing with the timing. The mechanical and vacuum advance seem to be working fine but it still pings when I stomp down on it no matter how I adjust it. What is it that stops the pinging under acceleration? More or less advance?
I have a 390 with a Holley 4160 and it seems to ping pretty bad. I just got the truck a few days ago and have been playing with the timing. The mechanical and vacuum advance seem to be working fine but it still pings when I stomp down on it no matter how I adjust it. What is it that stops the pinging under acceleration? More or less advance?
Post Fiend
Joined: Feb 2001
Posts: 6,624
Likes: 8
From: Missouri
Less advance will stop the pinging. You guys need to check your total timing. I am over 10:1 and am far from having detonation problems. You guys running stock compression 390s shouldn't even know what a "ping" sounds like. If you are pinging then you have a severe carbon buildup or you are running way too lean. Your total advance has to be way up in the clouds.
Senior User
Joined: Jun 2002
Posts: 119
Likes: 0
From: simpsonville USA
I have some pinging too. I am at 10:1 and at mod load I get detonation. I have found that if I pull the choke out just a tad the pinging will disappear. The 390 engine is new with an Edel performer and 650 carb. Mild crane dual duration cam. I opened up the the heads with CJ valves. Darn intake just didn't fit right. So maybe I have a small leak underneath. Vacuum is 17 and relatively steady at 800 rpm? Ignition is new but stock. Advance is about right. Idle mixture screws are out about three. Should I take these scews out more?
Ken
68 F100 390
74 Bronco 351W
Ken
68 F100 390
74 Bronco 351W
Thread Starter
|
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
i put in my crane vaccuum canister and ran my truck. I heard some pinging so i turned out the canister 2 turns as recommended and my truck ran pretty good then. I still need to hookup up a timing light and get it dialed in for max power but i am impressed. The kit comes with 3 springs to recurve the distributors but i didn't bother with it. I am not sure why my motor pings other then i went from a 2bbl to 4bbl. I got the oponion of 3 other people and they had agreed that my motor pings. I have probably 9 something compression.
Thread Starter
|
Postmaster
Joined: Jul 2003
Posts: 3,934
Likes: 0
From: iowa
for fun i thought i would share cranes opionon. "in general, cars and trucks originally equipped with ford electronic distributors will be able to use a total advance of 45 to 55 degrees. Limiting factors are: increased compression,octane rating, certain manifolds, lockup torque converters, extremely heavy loads, and lean fuel mixture."