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Pinging on Highway

 
  #1  
Old 03-26-2019, 10:45 AM
mgraveman
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Pinging on Highway

My stock 2006 F350 was pinging like crazy on the highway yesterday at 80 MPH. I was running 2800 RPM. I have a manifold leak, but don't think this is it. I'm sure this thing has got a ton of deferred maintenance, but don't even know where to start. It's a manual transmission with 170k miles on it, chassis cab. I've got a 500 mile return trip home friday, would like to fix it here if it's simple. No CEL.

It also seems a little low on power, but maybe that's not really it. I just thought a 3v engine would be a little more responsive. I'm running 87 octane.
 
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Old 03-31-2019, 07:06 AM
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Iím sorry no one has responded to you. Thatís abnormal on FTE.

Sounds to to me like catalytic converters. Seems like every ford Iíve owned has them go bad around 200,000 miles.
2000 Contour,
2003 E250,
2007 E350,
2010 Escape (only has 140,000)

And now that I think of it; maybe the extra back pressure from the cats is causing the manifold gaskets to fail.

Does yours sputter and struggle at medium-high throttle input?
And/or medium-high rpm?
also Iíve read about using a laser thermometer to check the temperature of the inlet and outlet of each cat to judge if itís plugged up. Spend an hour on YouTube researching this method though. I donít know what temp spread is acceptable.

if so- I bet you have at least one bad catalytic converter.
 
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Old 04-04-2019, 03:25 PM
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Im50Fast is dead on. I have been going nuts with this issue with my 2004 E450 SuperDuty 6.8L. Turns out the Catalytic Converter was clogged. 78k miles on it. Just had it changed and the pinging is completely gone and the power is SUPER! Do not have the dealer change it though...lol. Dealer price on the converter is over $2,000.00. Got it changed with labor in a shop in Mesa Arizona for $600.00. Could not be happier.
 
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Old 04-04-2019, 07:43 PM
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A vacuum guage can tell you if your exhaust is plugged up.

https://www.ericthecarguy.com/faq/so...t-restrictions
 
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Old 04-06-2019, 11:12 AM
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Turns out the problem virtually went away with 91 octane gas. Iíd like to not keep putting this in there but that makes the converter seem unlikely. Any other ideas?
 
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Old 04-06-2019, 11:14 AM
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Now Iím worried my gas mileage is going to suck because Iím actually using the throttle
 
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Old 04-06-2019, 02:43 PM
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Should not ping on 87 octane.
Something is not right.
Could be running lean
Check O2 sensors
 
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Old 04-06-2019, 04:30 PM
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No cel. I know they could still be bad, Are those something I can check myself?
 
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Old 04-08-2019, 06:28 AM
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Originally Posted by mgraveman View Post
No cel. I know they could still be bad, Are those something I can check myself?
you could try the suggestions in posts 2,3, and 4 above.
 
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Old 04-08-2019, 08:48 AM
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If it were a plugged catalytic converter why would it go away with higher octane fuel? The fact that the fuel made a difference made me think that it Has to be something in the engine management system. Oxygen sensor makes a lot of sense. I know that with the scan tool there are ways to test them but I wasnít sure if there was a way to do it otherwise. It may not matter because I called the part store and sounds like theyíre only $25 apiece. With 200,000 miles on them I will probably just replace them anyway.
 
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Old 04-08-2019, 05:01 PM
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1st why do you think a manifold leak is not the cause?

2nd do the deferred maintenance

3rd I suggest making sure injectors are all in good condition, one or 2 that are not spraying or partially working will cause lean condition in those cylinders. This in turn will make other cylinders too rich, because O2 sensors will try to compensate.
 
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Old 04-09-2019, 07:43 AM
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Originally Posted by rock2610d View Post
1st why do you think a manifold leak is not the cause?

2nd do the deferred maintenance

3rd I suggest making sure injectors are all in good condition, one or 2 that are not spraying or partially working will cause lean condition in those cylinders. This in turn will make other cylinders too rich, because O2 sensors will try to compensate.
pinging and the manifold leak are different noises. Pinging is more irregular and happens at load, the manifold leak is constant. It needs fixed, will probably go to the mechanic next week. Iím not doing the manifold.

no cel currently but I had a persistent misfire when cold this winter. That sounds a lot like what you talk about with the missing. Itís beginning to sound more and more like Iím going to have to just take it to the mechanic and let him diagnose it with the scan tool. I was hoping to save some money if it was something simple by doing it myself before taking it to him.
 
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Old 04-09-2019, 09:28 AM
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Ok, let's look at the exhaust manifold leaking.

It may not be the the "sound" you are hearing, but may cause pinging.

As exhaust excapes the manifold via leaks the O2 sensors, that are down stream from the leaks, are not sensing the correct air fuel ratio.

Maybe the O2 sensors are making the motor or a bank run lean because they are sensing the wrong reading due to exhaust manifold leaks.
 
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Old 04-09-2019, 09:57 AM
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Hmm....hadnít considered that. Itís getting the new manifold next week. Guess Iíll wait till then to see if it still does it.
 
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Old 04-11-2019, 08:55 PM
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I disagree completely.

Exhaust manifold leaks wonít cause your engine to run bad, nor cause steady highway pinging. And it doesnít cause wrong o2 readings.
People always says that, but think about it like if your exhaust manifolds and exhaust pipes were flowing water instead of hot exhaust: ok great some water leaks at the mating surface of the head and manifold. But the manifold is still full. Itís not magically sucking outside atmosphere into the stream; because the exhaust system has pressure, not vacuum. A pressurized leak is just a leak. The exhaust system is still full of exhaust, even though itís leaking some.

Ive read your posts repeatedly and it still seems like catalytic converter(s).
Could be bad spark plugs or bad fuel or anything else basic. But steady spark knock at highway speeds is almost certainly caused by excessive exhaust back pressure IF coupled with low power.

Which leads to my questions above, that you didnít answer:
Does your engine sputter and struggle at medium-high throttle input while driving? And/or medium-high rpm?

Two separate questions there, read and reread- donít just answer quickly.
 

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