piston slap on start up - Ford Mustang Forum
 
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Old 10-01-2015 Thread Starter
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piston slap on start up

either piston or upper end chatter for about 1 or 2 seconds on start up..my 98 ls1 had piston slap on start up, which chevy said was normal..how about ford?

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Old 10-01-2015
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What year is your car? It is semi normal on earlier 2Vs...most likely it's valvetrain (lash adjusters not pumping up imediately) or timing chain related (tensioners wearing out).


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Old 10-01-2015 Thread Starter
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its an 04 with abt 143k on the clock...it makes the noise only on start up when cold..it only lasts a second or so..
the only other times the engine makes noise is if i forget to downshift and get on it a bit..and sometimes when i blip the throttle from idle, it will ping slightly. other than that the engine runs great, very willing


thanks
mike
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Old 10-01-2015
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Originally Posted by mikenicholas327 View Post
its an 04 with abt 143k on the clock...it makes the noise only on start up when cold..it only lasts a second or so..
The only other times the engine makes noise is if i forget to downshift and get on it a bit..and sometimes when i blip the throttle from idle, it will ping slightly. Other than that the engine runs great, very willing


thanks
mike
have you changed brand of oil filter? What you may be hearing is bearing knock because a lot of the cheaper oil filters don't have an anti-drain back valve.when you start up you have no oil pressure until filter and clearences pump back full of oil.does it sound like a small hammer tapping? THE MOTORCRAFT AND WIX FILTERS ARE THE ONLY TWO I KNOW THAT HAVE THE ANTI-DRAIN BACK VALVE

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Old 10-01-2015
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Originally Posted by ALLYDRIVER1 View Post
have you changed brand of oil filter? What you may be hearing is bearing knock because a lot of the cheaper oil filters don't have an anti-drain back valve.when you start up you have no oil pressure until filter and clearences pump back full of oil.does it sound like a small hammer tapping? THE MOTORCRAFT AND WIX FILTERS ARE THE ONLY TWO I KNOW THAT HAVE THE ANTI-DRAIN BACK VALVE
I had no idea about that,i use mobile one
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Old 10-02-2015
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Originally Posted by sleeper bird View Post
i had no idea about that,i use mobile one
may not be your problem but worth a try

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Old 10-02-2015
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Its your timing tensioners we see these all the time fail on the 5.4s and occasionally on the 4.6s. I would recommend that you get that fixed before the chain guides break. If that happens then be wary of your timing cover. These motors are very sensitive about the weight of oil. 5-20 and 5-30 shouldnt hurt the motor, ive also never heard of an oil filter making this issue because the filter wont drain the pressure in the hydraulic tensionsers allowing the timing chain to "slap"

In the workshop manual, the first step is to check the oil level by the way.

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Old 10-02-2015
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Originally Posted by 6stang02 View Post
Its your timing tensioners we see these all the time fail on the 5.4s and occasionally on the 4.6s. I would recommend that you get that fixed before the chain guides break. If that happens then be wary of your timing cover. These motors are very sensitive about the weight of oil. 5-20 and 5-30 shouldnt hurt the motor, ive also never heard of an oil filter making this issue because the filter wont drain the pressure in the hydraulic tensionsers allowing the timing chain to "slap"

In the workshop manual, the first step is to check the oil level by the way.
don't know about draining the tensioners,but do know will let oil drain out of filter, if that happens you get no oil pressure until filter refills.so rod knock is the results of no oil in them. no one said anything about this causing timing chain slap,read the post!

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Old 10-02-2015
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If you understand these motors then you would understand why i mentioned this. The reason why i said that he assumed it was piston slap was due to a noise he heard. Hydraulic tensionsers especially on the modular motors will cause a "knock" or "tick" on start up. Once the tensioners build oil pressure it takes the slack out of the chains and shuts the noise up. Maybe instead of jumping on my post read up on the modular motors and how the tensioners work in the timing system. If you dont believe me search around about these tensioners failing, you will find many posts about this. But obviously, working in heavy line at the Ford dealership i do not understand this enough for people to mistake piston slap for the gaskets blowing out on the tensioners. But hey, it isnt my prollem, just trying to help lead this guy to either the solution or another option to look into. Good luck mike.

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