Slight tick- oil additive suggestion
#3
Race Car
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Could also be that vacuum leak that is giving you other problems.
They can sound like a tick sometimes.
Can you isolate where its coming from?
Even if its a lifter or injector, you should be able to get a sense of where it is.
All that said, if you search, I think you'll find a number of folks that have some results from Swepco for lifter tick. There are others as well. If that's what it is, it may resolve after some driving once you get it squared away.
They can sound like a tick sometimes.
Can you isolate where its coming from?
Even if its a lifter or injector, you should be able to get a sense of where it is.
All that said, if you search, I think you'll find a number of folks that have some results from Swepco for lifter tick. There are others as well. If that's what it is, it may resolve after some driving once you get it squared away.
#6
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First isolate the sound. Get a mechanics stethescope or the longest screwdriver you have and find the source. (put the screwdriver handle against your ear and move the tip of the screwdriver on the injectors then different spots on the cam covers.) If it's a lifter, Marvel Mystery oil has worked for lots of us. If it's the injectors try some Techron or a good fuel system cleaner. DON'T go to a thinner oil than what's recommended in the owners manual. Also check your HVAC diaphrams, when they leak they can make a ticking sound.
#7
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Swepco 502 was suggested
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#9
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Since it's been more than a year since I've heard anyone else's 928 and have forgotten "what's normal," I've been wondering the same thing as the O.P. regarding my car.
Is the ticking/tapping sound normal (injectors?) or something to investigate further?
I guess I should dig out my stethoscope and go hunting unless it's obvious to anyone that these are normal sounds.
Perhaps this can also serve as a useful reference to the O.P. Same sound? Something different?
(Turn the sound up pretty much or you can't hear the ticking/tapping.)
Is the ticking/tapping sound normal (injectors?) or something to investigate further?
I guess I should dig out my stethoscope and go hunting unless it's obvious to anyone that these are normal sounds.
Perhaps this can also serve as a useful reference to the O.P. Same sound? Something different?
(Turn the sound up pretty much or you can't hear the ticking/tapping.)
#10
Burning Brakes
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Ed - lifters? Last year I put my car away for the winter and when I first started it in the spring, I had that same ticking sound. Drove the car around and it went away.
#11
Race Car
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The frequency of that ticking sound matches the normal firing pattern of injectors. Are they new or newly cleaned? New/clean injectors are usually louder than old/dirty ones.
I have a similar tick but since I run 42lb injectors, mine are in enhanced mode at idle so only fire half the time.
Dan
'91 928GT S/C
475hp/460lb.ft
I have a similar tick but since I run 42lb injectors, mine are in enhanced mode at idle so only fire half the time.
Dan
'91 928GT S/C
![EEK!](https://rennlist.com/forums/images/smilies/eek.gif)
#12
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The frequency of that ticking sound matches the normal firing pattern of injectors. Are they new or newly cleaned? New/clean injectors are usually louder than old/dirty ones.
I have a similar tick but since I run 42lb injectors, mine are in enhanced mode at idle so only fire half the time.
Dan
'91 928GT S/C
475hp/460lb.ft
I have a similar tick but since I run 42lb injectors, mine are in enhanced mode at idle so only fire half the time.
Dan
'91 928GT S/C
![EEK!](https://rennlist.com/forums/images/smilies/eek.gif)
This morning, I probed around with a stethoscope, and sure enough, the noise was loudest at each injector body. That's pretty close to the valves, too, but probing around on the cam covers didn't reveal much noise. Furthermore, each injector sounded about the same; that would indicate normal operation rather than a sticky lifter or whatever, right?
Kind of interesting doing that. I might just have to shoot another video, this time showing what's being probed and what it sounds like. I'm rather ashamed to admit that I don't think I've ever actually used my mechanic's stethoscopes yet (have two, just took this one out of the shrink-wrap this morning.
![Smilie](https://rennlist.com/forums/images/smilies/smile.gif)
Still waiting to hear from PC-85-928S: same sound, or not?
And thanks for your comments, Dan.
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Last edited by Ed Scherer; 04-17-2012 at 12:28 PM.
#15
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I recently had the injectors cleaned.
Does the marvel mystery oil go in the oil, or the gas?
Does it replace a quart?
Does the marvel mystery oil go in the oil, or the gas?
Does it replace a quart?