Ticking noise question
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Ticking noise question
Have a 92 F-150 with the 4.9L, Auto, A/C, 72,000 miles. Just recently has begun having a ticking sound toward the rear of the engine. It has always been alittle noisy, but this is new. I am thinking it is probably a lifter, but the ticking sound is only about 3 per sec, or around 180 a minute. This engine idles at about 750 rpm. If this noise was a lifter wouldn't the sound be more frequent? Do injectors make a ticking sound as they wear? Also if it is a lifter would it hurt anything to try a cleaner like Marvel Mystery Oil? If needed is it difficult to replace a lifter? This truck has EFI. Thanks for your time.
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It is hard to tell if it ticks while driving, but it does at idle, both slow and fast idle. The EGR valve is still pretty new, a couple of years old, I will have to check out the exhaust system. Thanks
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From: Spokane
It could also be the PCV valve. It's towards the firewall right behind the valve cover. Mine's kinda loud and it took me quite a while to figure out what was making all the noise. Just something to check out.
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Wik
You are the man, finally had time to really investigate the ticking noise. I can't believe it, but it was a loose sparkplug. I was all ready to start taking off the air induction system to get to the valve cover tonight, when I found that loose sparkplug. What a sweet noise to hear that rumbling six without that dang tick. Thanks to all that responded, but Wik you were right, a loose sparkplug does sound like a lifter tick.
You are the man, finally had time to really investigate the ticking noise. I can't believe it, but it was a loose sparkplug. I was all ready to start taking off the air induction system to get to the valve cover tonight, when I found that loose sparkplug. What a sweet noise to hear that rumbling six without that dang tick. Thanks to all that responded, but Wik you were right, a loose sparkplug does sound like a lifter tick.
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From: Timmins,Ontario,Canada
The bombs got some weird noises coming from it too. I get some tick too, but i suspect its the the injector(s) that got a bad case of the squirts. I get a little gas in there too, gotta change em soon. The valves get a bit a noice from time to time, like a startup or once wormed up like at a stoplight its gets a slower raaat raaat raaat raaat noise kind of like a diesel. Sounds like a well broken 300 with sawdust ticks and rats.
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