First time 'PINGING'
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Lead Driver
Joined: Mar 2008
Posts: 7,174
Likes: 377
From: Near Los Angeles
First time 'PINGING'
The outside temp today was about 115 where I was. The truck was unloaded and running a bit hotter than normal, understandably. When I got on the freeway it pinged so badly I could hardly accelerate. The temp also went up, but I expected that being it was the first time to drive in such heat.
Any ideas on the pinging? Street driving at normal temps it seems fine.
Any ideas on the pinging? Street driving at normal temps it seems fine.
Tuned
Joined: Nov 2007
Posts: 386
Likes: 3
From: Whitmore lake Mi
I Googled this... "is msd ignition heat sensitive?". And found this and a few others...
MSD ignition suggestions... [Archive] - MallCrawlin.com Forums
I found this intersesting...
Ignition Coil - Tech - Terms & Definitions - Hot Rod Magazine
Jim
MSD ignition suggestions... [Archive] - MallCrawlin.com Forums
I found this intersesting...
Ignition Coil - Tech - Terms & Definitions - Hot Rod Magazine
Jim
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Mine also pings considerably more when it's hot out, and I have to be careful accelerating. Not sure how to address it quite yet, but wanted to let you know you weren't alone in it. It's with the Duraspark II ignition, and whatever Schucks/Oreilly's aftermarket performance coil is.
Normal days I can't get it to ping if I try.
Normal days I can't get it to ping if I try.
Elder User
Joined: Nov 2004
Posts: 666
Likes: 5
I suspect your biggest problem with pinging is due to lack of EGR. Without EGR, timing and F/A ratio are much more critical. Check your initial timing, and check to see how much vacuum advance you get. I removed the EGR from my 300. Took a bit of tweaking to get rid of the ping. I found that my vacuum advance pulled in about 20 degrees more timing. I pulled and plugged the vacuum line to the distributor. I am getting ready to rebuild the distributor and will adjust the vacuum advance to give a lot less total advance.
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Hey F100Jim,
That makes a lot of sense! I hadn't thought of that. Again, makes me wonder if reinstating a simple EGR setup is worth the trouble. Doesn't more advance on the highway mean more mpg?
That makes a lot of sense! I hadn't thought of that. Again, makes me wonder if reinstating a simple EGR setup is worth the trouble. Doesn't more advance on the highway mean more mpg?
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Lead Driver
Joined: Mar 2008
Posts: 7,174
Likes: 377
From: Near Los Angeles
I suspect your biggest problem with pinging is due to lack of EGR. Without EGR, timing and F/A ratio are much more critical. Check your initial timing, and check to see how much vacuum advance you get. I removed the EGR from my 300. Took a bit of tweaking to get rid of the ping. I found that my vacuum advance pulled in about 20 degrees more timing. I pulled and plugged the vacuum line to the distributor. I am getting ready to rebuild the distributor and will adjust the vacuum advance to give a lot less total advance.
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
IIRC stock initial timing is between 6* and 10*. With my razuu Mallory box, ACCELL coil, recurved dizzy, Taylor wires, and NGK plugs, it's not happy unless it is set right at 8*. You might try backing off on the initial a degree or two at a time, drive and try.
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Lead Driver
Joined: Mar 2008
Posts: 7,174
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From: Near Los Angeles
The guy who recurved the dizzy told me to run 16 initial advance, and that there was 16 degree vacuum as well. I tried it and bumped it back.
It has run perfect for seven months at this timing. But on that hot (115 degrees) day, it pinged getting on the freeway. As soon as I got to streets, and temp dropped, it was fine once more.
"razuu Mallory box," I don't think I'm familiar with that model. lol
It has run perfect for seven months at this timing. But on that hot (115 degrees) day, it pinged getting on the freeway. As soon as I got to streets, and temp dropped, it was fine once more.
"razuu Mallory box," I don't think I'm familiar with that model. lol
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FTE Legend
Joined: May 2008
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From: In my own world
gas is formulated 3 or 4 times per season. the hotter it gets, the more it is changed, to keep it from vapor locking. get some octane booster, and add it when it is real hot out. this is especially true for gas-a-hol. hahahaha. the alcohol evaporates, and you are left with a less than desirable mix to burn
Fleet Mechanic
Joined: Feb 2007
Posts: 1,326
Likes: 48
From: Middle TN
16 degrees sounds like a lot of initial advance, I would think more like 10 would be right.
I could be that you are running to lean. Gas with alcohol needs a little larger jet in the carb. or back the timing down to compensate. Move the timing a little at a time until it stops pinging.
I could be that you are running to lean. Gas with alcohol needs a little larger jet in the carb. or back the timing down to compensate. Move the timing a little at a time until it stops pinging.
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Lead Driver
Joined: Mar 2008
Posts: 7,174
Likes: 377
From: Near Los Angeles
Research has told me that 32 degrees total advance is what you want. Without the vacuum advance your mpg will suffer.
I may bump the initial advance back a couple of degrees. I guess I hesitate because it ran great set there for seven months. It was the heat that affected it. I think carrying a bottle of octane booster will help.
I may bump the initial advance back a couple of degrees. I guess I hesitate because it ran great set there for seven months. It was the heat that affected it. I think carrying a bottle of octane booster will help.
Moderator
Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Heya F-250,
Personally, if it were me, I'd leave it alone since it works great all of the time. The only time to worry about having too much initial advance is if you have hard starts (kickback on the starter), or if it's pinging all the time. If it's only under certain circumstances (ie. hot outside), figure out a way to deal with the special case. Aka. tune it for how it'll run best 95% of the time.
In this case, I'd say a bottle of octane booster, or high octane fuel on hot days.
Personally, if it were me, I'd leave it alone since it works great all of the time. The only time to worry about having too much initial advance is if you have hard starts (kickback on the starter), or if it's pinging all the time. If it's only under certain circumstances (ie. hot outside), figure out a way to deal with the special case. Aka. tune it for how it'll run best 95% of the time.
In this case, I'd say a bottle of octane booster, or high octane fuel on hot days.
Elder User
Joined: Apr 2009
Posts: 922
Likes: 1
From: San Diego
my egr was removed by a p.o. any ideas on where to get the pipe that goes between the exhaust manifols and the egr input? my local jy, had only 1 and it was rusted apart...
I ask because i get pinging under throttle with the dizzy hooked up to vacuum, and little to none with it disconnected.
I tried setting different timing, with mixed results, so i set it back to the stock 8 degrees. runs fine around town, but I would like to get back a few mpg cheaply...
I ask because i get pinging under throttle with the dizzy hooked up to vacuum, and little to none with it disconnected.
I tried setting different timing, with mixed results, so i set it back to the stock 8 degrees. runs fine around town, but I would like to get back a few mpg cheaply...
Last edited by 6fifty_f1fifty; Oct 4, 2010 at 10:05 PM. Reason: added info