Another Pinging 302
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I don't know if this tells anything, but it pings worse when it's warm - both outside temperature and engine temperature. When it's winter it hardly pings at all. Even if it's summer it doesn't start pinging until the engine starts warming up. Does this tell me anything about the cause of the problem at all?
Fleet Owner
Joined: Sep 2005
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From: Lake Tahoe, Nevada
Originally Posted by Mud Bone
I don't know if this tells anything, but it pings worse when it's warm - both outside temperature and engine temperature. When it's winter it hardly pings at all. Even if it's summer it doesn't start pinging until the engine starts warming up. Does this tell me anything about the cause of the problem at all?
Try the water trick to de-carbonize the cyls. Take a pint of clean water, run the engine about 2,000 rpm, pull off any small manifold vacuum line and use it to suck up water for two seconds. Watch the exhaust. If it is carbon, you will see fine particulant matter being blown out the exhaust. If so, put the whole pint of water through it. If it is still blowing lots of dust (not just steam,) out the exhaust, you may have to do it again. Just be sure to feed it through slowly.
Keep us posted.
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Joined: Oct 2005
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I did all the tune up stuff also, along with questioning the knock sensor, timing, etc and have this problem. I also did multiple seafoam baths, similar to the water trick. I just assume carbon build up is increasing compression and I've surrendered to 93 octane gas. I don't have any problems with premium, even running up hill with a load in the summer, and paying a little more for gas is less than risking engine damage from knock.
Tuned
Joined: Jun 2006
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when i first got my truck (1990 f150, 5L) i did a full tune up. the parts store was all out of normal plugs so i tried platinums. what a mistake that was, i was pinging in 5th down the highway all the time. went back a week later and intalled regular V groove and have never looked back. i don't know why but some types of motors just don't work well with platinum plugs (not just fords)...so check out those plugs.
Hotshot
Joined: Aug 2002
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From: BC, Canada
Mud Bone did it ping before you replaced the plug wires?
I don't remember which firing order a 1992 302 has but if it's 15426378 then check how you have #7 and 8 wires routed. If they are nice and neat and parallel to each other that can cause a ping. The wires can set up an induction crossfire.
The cure is to make sure the wires are as far away from each other as possible and if they have to be close together then cross them.
I don't remember which firing order a 1992 302 has but if it's 15426378 then check how you have #7 and 8 wires routed. If they are nice and neat and parallel to each other that can cause a ping. The wires can set up an induction crossfire.
The cure is to make sure the wires are as far away from each other as possible and if they have to be close together then cross them.
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Joined: Jan 2005
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From: Alberta, Canada
Originally Posted by Racerguy
The wires can set up an induction crossfire.
The cure is to make sure the wires are as far away from each other as possible and if they have to be close together then cross them.
The cure is to make sure the wires are as far away from each other as possible and if they have to be close together then cross them.
Can you explain?
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Fleet Owner
Joined: Sep 2005
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From: Lake Tahoe, Nevada
Originally Posted by Fallguy2004
Now I have never heard of this??
Can you explain?
Can you explain?
The current through one wire, (any wire, more so at high voltages,) creates a magnetic field around it. As the field expands and contracts through the neighboring wire, it induces a current flow which causes an out of sequence firing of the plug. (That's the principle behind what makes a coil work.)
By routing the wires so that they are not paralell will reduce the induction effect.
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Well, it's not pinging anymore. I moved the spark plug wires away from each other and the pinging is gone. Thanks guys so much for your help. But I have another question: aren't the wires supposed to be shielded to prevent crossfiring? Also, if running them parallel to each other is bad, why do they have clips that keep them parallel?
Thanks Again.
Thanks Again.
Hotshot
Joined: Aug 2002
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From: BC, Canada
I should have explained it a bit better when I first replied.
It's the ones that are physically next to each other and firing next to each other, #7 and 8 in this case, that you have to be careful with. The rest of them can be routed parallel.
It's the ones that are physically next to each other and firing next to each other, #7 and 8 in this case, that you have to be careful with. The rest of them can be routed parallel.
Lead Driver
Joined: Feb 2002
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From: Greater Austin, Texas
Racerguy beat me to it. I used to have a '90 302 that pinged like crazy, even on super unleaded. A guy at McRee Ford in Dickinson, Texas, hipped me to the plug wire thing. I moved them apart right there in their parking lot and it never did it again. The fact that they are next to each other in the firing order causes the crossfire.