the Ticking sound... - Ford Bronco Forum
 
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post #1 of 11 (permalink) Old 02-14-2017, 06:18 PM Thread Starter
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the Ticking sound...

So - found a few threads on it already, but guess my problem is different.

I have this ticking sound which is only there under LOAD, so press throttle, ticking sound appears and increases with more gas/higher revs. At first I though about dirty, hanging valves. So refreshed the oil and added a quart of Marvel mystery oil instead of a quart of Oil. Also added to the gas. Few weeks in, 0 improvement. What else could this be? Hole in exhaust/manifold?

Thanks!

Dan
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post #2 of 11 (permalink) Old 02-14-2017, 07:00 PM
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Is it loud? Like can hear it over the radio? Or if you turn radio up a little you cant hear it?

Does it do it reving in parked? Or only while driving?

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post #3 of 11 (permalink) Old 02-14-2017, 07:21 PM
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A noise like you are describing, that happens ONLY under load is almost always pre-ignition (spark knock).
If your base timing is above 10, put it back to 10 BTDC and see if that fixes the problem. Do you have any DTCs (trouble codes)?
Another possibility is that you have a very lean mixture, which will will have a tendency to "knock". Large vacuum leaks could lean out the mixture, but will also cause a high idle, and usually some trouble codes.
A third possibility is that you have very low octane fuel. Try a full tank of premium fuel from a gas station you don't usually use (could be that your regular gas station had contaminated fuel).

Also tell us what the last thing you did before this problem occurred (bought fuel/changed vacuum lines/cleaned PCV/ etc. anything, even if you don't think it may have an effect).

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post #4 of 11 (permalink) Old 02-14-2017, 09:34 PM
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Just out of curiosity, what grade Gas are you running. Both my Bronco's do NOT like regular! I run mid grade 89 ocaine...
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post #5 of 11 (permalink) Old 02-15-2017, 02:59 AM
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that's interesting. I've had idle and slight tic/knock issue that didn't make any sense and I always put in the cheap sh!t.
I always run the highest oct I can get in the hog... but I've been cheap on the Bronco's.
Guess I'll have to try and pony up a few more bucks and see what's what.

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post #6 of 11 (permalink) Old 02-15-2017, 07:24 PM Thread Starter
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thanks guys - much appreciated.

the 'loudness' of the ticking differs from day to day, but generally it is quite loud, but if I put up the radio it is not noticeable anymore. It seems to come from the passenger side, and also is apparent while standing still and revving (though much less).

The Bronco had it since I bought it a couple of months ago. Like said, thought it would be an internal issue which simply needed a clean (like MMO). I've got a CEL recently with code P0401. So ...ordered silicone hoses and a new return valve, yet to install.
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post #7 of 11 (permalink) Old 02-15-2017, 09:00 PM
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I have had a PCV valve do that. New Motorcraft, replaced Napa Crappa, and no more tick. Also, loud lifter could be the culprit.
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post #8 of 11 (permalink) Old 02-15-2017, 11:34 PM
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Might want to check your exhaust manifold for cracks.

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post #9 of 11 (permalink) Old 02-16-2017, 08:04 AM
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Timing? ("pinging"), low-octane gas?

Maybe an exhaust manifold problem (crack or gasket), or loose spark plug? I've seen either make odd sounds.

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post #10 of 11 (permalink) Old 02-16-2017, 08:09 PM Thread Starter
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thanks again - listened just now, and no ticking while standing still and revving. Run regular 87 btw.

i'll check spark plugs, replace PCV and put some premium gas in it.

Any tips to check for manifold cracks? or just visually inspect for crack(hair)lines?
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post #11 of 11 (permalink) Old 02-16-2017, 11:50 PM
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get your hands out there and feel around it before it gets too hot.
you should feel the exhaust blowing through the crack.
other than that... yea, a flash light and a keen eyeball.


some more mechanical guys might have better advice.

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