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what is this engine noise? with video by grsychckn
Started on: 08-19-2014 08:22 PM
Replies: 9 (180 views)
Last post by: grsychckn on 08-23-2014 09:50 AM
grsychckn
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Report this Post08-19-2014 08:22 PM Click Here to See the Profile for grsychcknClick Here to Email grsychcknSend a Private Message to grsychcknEdit/Delete MessageReply w/QuoteDirect Link to This Post
Picked up this car from a fellow member last weekend in a swap for mine. He suggested it might be the oil pump but it seems so intermittent I'm not sure. I'll confirm tomorrow but it appears as if the oil pressure gauge stays high when the engine makes the sound. I'm thinking something in the valve train but not sure. Any ideas on where to start? Thanks in advance.

Fiero engine noise
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army_greywolf
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Report this Post08-19-2014 10:35 PM Click Here to See the Profile for army_greywolfClick Here to Email army_greywolfSend a Private Message to army_greywolfEdit/Delete MessageReply w/QuoteDirect Link to This Post
Is the car a manual transmission by chance?
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grsychckn
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Report this Post08-19-2014 11:40 PM Click Here to See the Profile for grsychcknClick Here to Email grsychcknSend a Private Message to grsychcknEdit/Delete MessageReply w/QuoteDirect Link to This Post
Yes, sorry. It is an 88gt manual and the video is of it idling.
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Patrick
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Report this Post08-20-2014 01:47 AM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by grsychckn:

I'm thinking something in the valve train but not sure. Any ideas on where to start? Thanks in advance.

Fiero engine noise


I've posted this a number of times. Seriously, it's worthwhile using one of these things.

 
quote
Originally posted by Patrick:

Eliminate the guesswork and spend a whole four bucks on a Mechanic's Stethoscope !



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mitchjl22
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Report this Post08-20-2014 02:28 AM Click Here to See the Profile for mitchjl22Click Here to Email mitchjl22Send a Private Message to mitchjl22Edit/Delete MessageReply w/QuoteDirect Link to This Post
Does the noise go away with the clutch pushed in? If so, its probably just neutral rattle from the Getrag.

-Mitch
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grsychckn
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Report this Post08-20-2014 06:37 AM Click Here to See the Profile for grsychcknClick Here to Email grsychcknSend a Private Message to grsychcknEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by Patrick:

I've posted this a number of times. Seriously, it's worthwhile using one of these things.

[QUOTE]Originally posted by Patrick:

Eliminate the guesswork and spend a whole four bucks on a Mechanic's Stethoscope !



[/QUOTE]

That's funny, I ordered mine yesterday. I should have it today. I'll use it and update the thread.
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grsychckn
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Report this Post08-21-2014 07:53 PM Click Here to See the Profile for grsychcknClick Here to Email grsychcknSend a Private Message to grsychcknEdit/Delete MessageReply w/QuoteDirect Link to This Post
Ok engaging the clutch makes no difference in the noise but I found tonight that makes the noise after a spike in throttle so I recorded another clip. Also, it appears as if it's coming from the firewall side of the engine (as heard on the stethoscope). Could this be piston slapping?

video two

Listen carefully as the engine revs down for the noise.
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plane
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Report this Post08-23-2014 12:45 AM Click Here to See the Profile for planeClick Here to Email planeSend a Private Message to planeEdit/Delete MessageReply w/QuoteDirect Link to This Post
Clacking. Generally a valve/lifter issue. The valves/pushrods might need adjustment. Sounds similar to when overhead cam cars sit for a long time and you get valve racket until the lifter refill with oil. So valve lash adjustment or maybe some bad lifters or - Did car sit for more than 2 weeks?
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jon m
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Report this Post08-23-2014 08:22 AM Click Here to See the Profile for jon mSend a Private Message to jon mEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by plane:

Clacking. Generally a valve/lifter issue. The valves/pushrods might need adjustment. Sounds similar to when overhead cam cars sit for a long time and you get valve racket until the lifter refill with oil. So valve lash adjustment or maybe some bad lifters or - Did car sit for more than 2 weeks?


I'd go for that as well

jon

[This message has been edited by jon m (edited 08-23-2014).]

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grsychckn
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Report this Post08-23-2014 09:50 AM Click Here to See the Profile for grsychcknClick Here to Email grsychcknSend a Private Message to grsychcknEdit/Delete MessageReply w/QuoteDirect Link to This Post
 
quote
Originally posted by plane:

Clacking. Generally a valve/lifter issue. The valves/pushrods might need adjustment. Sounds similar to when overhead cam cars sit for a long time and you get valve racket until the lifter refill with oil. So valve lash adjustment or maybe some bad lifters or - Did car sit for more than 2 weeks?


I just picked up the car last week and am not sure how long it sat. The previous owner informed me that it has been making that noise while he owned it (drove it approximately 3k miles). I have to pull off the valve covers soon anyway as the gaskets are leaking so I can check the valve lash then (although I've never done it and it appears there are several prevailing opinions on how). How would I determine if a lifter needs replacing? If one (or more) does, can I do that without tearing the engine down and replacing the cam as well?

Also, I purchased a high volume oil pump to install - would this help "unstick" a lifter?

Thanks.

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