Pennock's Fiero Forum
  Technical Discussion & Questions
  Odd 2.5 sound

Post New Topic  Post A Reply
Email This Page to Someone! | Printable Version


next newest topic | next oldest topic
Odd 2.5 sound by Zeak
Started on: 03-12-2014 08:06 AM
Replies: 11 (178 views)
Last post by: jaskispyder on 03-13-2014 07:05 PM
Zeak
Member
Posts: 108
From: Lake of the ozarks MO
Registered: Dec 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-12-2014 08:06 AM Click Here to See the Profile for ZeakSend a Private Message to ZeakEdit/Delete MessageReply w/QuoteDirect Link to This Post
I'm still somewhat indifferent about my 2.5 duke, but I want to take care of it until I decide which direction I want to go.
I did a basic tune-up about 4 months ago and she was running a lot better.
Rebuild the 700 throttle body.
New plugs and wires.
Replaced the timing gear cover gasket
Replaced the harmonic balancer seal and did the repair sleeve.
New belt and tensioner pulley. (the tensioner lines are lined right up to where they should be)

Now I've noticed that when you have the engine under load, it makes a sound sort of like what you would hear from a diesel engine head.
Is that pinging or just lifter clatter?

------------------

1988 Fiero 2.5

IP: Logged
PFF
System Bot
carbon
Member
Posts: 4767
From: Eagan, MN
Registered: Apr 2004


Feedback score: (2)
Leave feedback





Total ratings: 133
Rate this member

Report this Post03-12-2014 09:27 AM Click Here to See the Profile for carbonSend a Private Message to carbonEdit/Delete MessageReply w/QuoteDirect Link to This Post
A friend of mine once told me he though the 88 Duke sounded like a Singer sewing machine... I wonder if it isn't the additional mechanical noise from the force balancer...
IP: Logged
Zeak
Member
Posts: 108
From: Lake of the ozarks MO
Registered: Dec 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-12-2014 09:40 AM Click Here to See the Profile for ZeakSend a Private Message to ZeakEdit/Delete MessageReply w/QuoteDirect Link to This Post
That is a better description of the sound I guess.

------------------

1988 Fiero 2.5

IP: Logged
Stubby79
Member
Posts: 7064
From: GFY county, FY.
Registered: Aug 2008


Feedback score: N/A
Leave feedback





Total ratings: 58
Rate this member

Report this Post03-12-2014 12:06 PM Click Here to See the Profile for Stubby79Send a Private Message to Stubby79Edit/Delete MessageReply w/QuoteDirect Link to This Post
I don't think your lifters would care if the engine is under load or not. I'd make the same noise either way, were it them. I'd say you're pinging or maybe have an exhaust leak(cracked manifold). Check what your O2 sensor is doing.
IP: Logged
jaskispyder
Member
Posts: 21510
From: Northern MI
Registered: Jun 2002


Feedback score:    (22)
Leave feedback





Total ratings: 205
Rate this member

Report this Post03-12-2014 01:26 PM Click Here to See the Profile for jaskispyderSend a Private Message to jaskispyderEdit/Delete MessageReply w/QuoteDirect Link to This Post
how much of a load? Going up a long hill and I gave the car some gas (as to pass) my '87 would ping. I ran higher octane gas and that seemed to help.

IP: Logged
Zeak
Member
Posts: 108
From: Lake of the ozarks MO
Registered: Dec 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-12-2014 02:29 PM Click Here to See the Profile for ZeakSend a Private Message to ZeakEdit/Delete MessageReply w/QuoteDirect Link to This Post
It's mainly when accelerating ( to try and merge onto the highway) Or when cruising in a higher gear.

------------------

1988 Fiero 2.5

IP: Logged
jaskispyder
Member
Posts: 21510
From: Northern MI
Registered: Jun 2002


Feedback score:    (22)
Leave feedback





Total ratings: 205
Rate this member

Report this Post03-12-2014 02:34 PM Click Here to See the Profile for jaskispyderSend a Private Message to jaskispyderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Which plugs did you use, and did you gap them correctly?

Does it get better with higher octane fuel?
IP: Logged
Zeak
Member
Posts: 108
From: Lake of the ozarks MO
Registered: Dec 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-12-2014 07:32 PM Click Here to See the Profile for ZeakSend a Private Message to ZeakEdit/Delete MessageReply w/QuoteDirect Link to This Post
I've not had a chance to try a higher octane fuel.
For plugs, I went with Ngk as I've had good results with them.
The box said they where pre-gaped, but the site said .060 and they where all 4 spot on.
I pulled them today just to have a look and they still look like new even after 4 months.

------------------

1988 Fiero 2.5

[This message has been edited by Zeak (edited 03-12-2014).]

IP: Logged
logical1
Member
Posts: 106
From: raliegh, nc
Registered: Feb 2014


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-12-2014 09:32 PM Click Here to See the Profile for logical1Send a Private Message to logical1Edit/Delete MessageReply w/QuoteDirect Link to This Post
I always go dealer specific. I had a 5.0 mustang with ac del co plugs and ran fine but sounded wierd... talked with a few gear heads and swapped out for motorcraft and it ran soooo quite and got good power. I dunno y but same plug base and gap, but it was like the signal was different or something. Just my experience.... thought id share after I saw the ngk. N I know thats usually for nissan or hondas.. but id try ac del co since they are gm brand. Plus 4plugs is like 20 $ or less
IP: Logged
Csjag
Member
Posts: 3170
From: Ocklawaha,Fl, USA
Registered: Dec 2013


Feedback score: N/A
Leave feedback

Rate this member

Report this Post03-13-2014 06:41 AM Click Here to See the Profile for CsjagClick Here to Email CsjagSend a Private Message to CsjagEdit/Delete MessageReply w/QuoteDirect Link to This Post
I agree with Zeak, the heat range on the NGK's could be a little off
IP: Logged
theogre
Member
Posts: 29206
From: USA
Registered: Mar 99


Feedback score: N/A
Leave feedback





Total ratings: 549
Rate this member

Report this Post03-13-2014 06:16 PM Click Here to See the Profile for theogreClick Here to visit theogre's HomePageSend a Private Message to theogreEdit/Delete MessageReply w/QuoteDirect Link to This Post
DIS engine doesn't like even hates:
many "improved" plugs
Missing/bad EGR valve
Dying MAT and/or MAP
Dying spark plugs

See my Cave, DIS Ignition and 87-88 DIS Duke ECM


------------------
Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)


The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

[This message has been edited by theogre (edited 03-13-2014).]

IP: Logged
PFF
System Bot
jaskispyder
Member
Posts: 21510
From: Northern MI
Registered: Jun 2002


Feedback score:    (22)
Leave feedback





Total ratings: 205
Rate this member

Report this Post03-13-2014 07:05 PM Click Here to See the Profile for jaskispyderSend a Private Message to jaskispyderEdit/Delete MessageReply w/QuoteDirect Link to This Post
Try stock plugs to see if that helps.
IP: Logged

next newest topic | next oldest topic

All times are ET (US)

Post New Topic  Post A Reply
Hop to:

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock