Car making a knocking sound. (Newbie)
Thread Starter
Supreme Member
iTrader: (3)
Joined: Jul 2009
Posts: 1,311
Likes: 3
From: Chicago, IL
Car: 1986 Pontiac Firebird
Engine: 97 LT1 W/ Alot of goodies.
Transmission: 4L60E W/ Yank SS3600
Axle/Gears: 3.27 9 Bolt BW
Car making a knocking sound. (Newbie)
So the cam has been making a very weird noise when turning over lately meaning when you try to turn over it makes a knocking sound kinda if you tap a engine part with a wrench or something similar in that ball park.
I looked online to see if it was the starter, and the noises car made does not sound anything close, the car does not turn over like i see in most of the cars i seen it just makes the knocking sound everytime you turn it over. It does start though after a few key turns. It started about 4 months ago i did not think of it much since it only did it for about 2-3 turns then started up normally but lately it needs more to turn over.
What can it be? I will be taking a video of the noise tomorrow and checking to see if anything is loose or worn out.
I looked online to see if it was the starter, and the noises car made does not sound anything close, the car does not turn over like i see in most of the cars i seen it just makes the knocking sound everytime you turn it over. It does start though after a few key turns. It started about 4 months ago i did not think of it much since it only did it for about 2-3 turns then started up normally but lately it needs more to turn over.
What can it be? I will be taking a video of the noise tomorrow and checking to see if anything is loose or worn out.
Supreme Member
Joined: Jan 2006
Posts: 3,341
Likes: 10
From: Mooresville NC
Car: LOWERED ♦ CRIMSON METALFLAKE
Engine: ► 400 KUBES ◄
Transmission: 765R4
Axle/Gears: EATON POSI 4.56
• Knock • Knock •
Have a friend crank the engine while you use a rubber hose as a stethoscope.
Make sure you stay away from moving parts.
You can put the end of the hose on a stick so your hand won’t be anywhere near a moving part.
That will help locate the source of the knocking.
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
Happy Racing!
◙◙◙◙◙◙◙◙◙◙◙◙◙◙◙
If People Drove Any Slower They’d Be Going BackwardsWhen you see fog lights on in good weather beware. Low performance driver ahead. Right grandma?
How bout those nervous nellies too scared to drive without headlights on in the daytime or if there is a little rain!
.
.
Junior Member
Joined: Nov 2009
Posts: 53
Likes: 0
From: Windsor, Ontario
Car: 1988 Firebird Formula
Engine: LO3 - 305 TBI
Transmission: T5
Re: Car making a knocking sound. (Newbie)
Is it just when you start it? Or is it the whole time the car is running? Is your check engine light on? If so you can buy an ALDL (assembly line diagnostic link) reader from wal-mart for $25, you plug it in under your dash and it gives you a code, and based on that code you can find out what's malfunctioning.
According to my repair manual, there's a few things that could cause a knocking sound.
- Ignition timing
- If it's carbureted then it (the carb) might need adjustment
- Improper spark plugs?
- Faulty emissions system
- Vacuum leak
According to my repair manual, there's a few things that could cause a knocking sound.
- Ignition timing
- If it's carbureted then it (the carb) might need adjustment
- Improper spark plugs?
- Faulty emissions system
- Vacuum leak
Supreme Member
Joined: Jan 2009
Posts: 2,313
Likes: 115
From: belle fourche,s.d.
Car: '82 z28
Engine: L83 5.7
Transmission: 700r4-1985
Axle/Gears: 3.42 posi
Re: Car making a knocking sound. (Newbie)
could be a cracked flexplate or loose flexplate bolts
(A/T tranny) if flexplate is cracked,cause could be loose
bellhousing bolts or a worn bushing in the tranny where
the torque converter pump drive fits.
(A/T tranny) if flexplate is cracked,cause could be loose
bellhousing bolts or a worn bushing in the tranny where
the torque converter pump drive fits.
Thread
Thread Starter
Forum
Replies
Last Post
thefirebirdm@n
South Central Region
3
Sep 14, 2015 01:45 PM
Linson
Auto Detailing and Appearance
40
Aug 21, 2015 02:12 PM
