BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
 
HomeHome  RegisterRegister  Log in  
Log in
Username:
Password:
Log in automatically: 
:: I forgot my password
Who is online?
In total there are 2 users online :: 0 Registered, 0 Hidden and 2 Guests

None

Most users ever online was 132 on Wed Oct 04, 2017 3:26 pm
Latest topics
» Looking for a bench seat/frame for an ‘84 C10
Yesterday at 4:18 pm by Ironfistdog

» 95 Impala SS Parts car - Last call for Parts - FREE DCM DOORS!!!
Fri Jun 15, 2018 7:46 pm by Big Wagon Guy

» WTB 9C1 rubber floor
Thu Jun 14, 2018 4:17 pm by MASShole9C1

» 1984 Impala
Sun Jun 10, 2018 10:13 am by Big Wagon Guy

» 1994 LT1 caprice parts for sale or trade...
Thu Jun 07, 2018 10:06 pm by ROCK SOLID LT1

» HEY HOW AH YAH?
Thu Jun 07, 2018 10:22 am by Tomz9C1

» Refinishing SS wheels
Tue Jun 05, 2018 8:44 pm by KingpinSS

» Like the mob, the B-bodies have pulled me back in.
Tue Jun 05, 2018 8:43 pm by KingpinSS

» In search of a 1996 knock module URGENT
Fri May 11, 2018 3:31 pm by fatvet

Search
 
 

Display results as :
 
Rechercher Advanced Search
June 2018
MonTueWedThuFriSatSun
    123
45678910
11121314151617
18192021222324
252627282930 
CalendarCalendar

Share | 
 

 Random knock

Go down 
AuthorMessage
CrashMaster

avatar

Posts : 189
Join date : 2011-12-05

PostSubject: Random knock   Tue Jul 03, 2012 7:50 pm

My 72k mile lt1 has started doing some random knocking. Sometimes it can go weeks without doing it and when it does I usually just let it idle in drive a little and it stops. However I think it stops because it's retarding the timing because I have noticed a serious lack of power at times.

My first question is this. The egr valve used to throw a code every once in a while when I first got it (sometimes on for weeks somtimes it would clear itself the same day) but it hasn't come on in a very long time. Is that most likely the problem?

Could it be as simple as plugs and wires? I think no since the knock rarely happens but does anyone think otherwise?

I have put 23k miles on it in the year I have owned it and it's a fairly recent problem.

Any help lt1 gurus?
Back to top Go down
Ironfistdog

avatar

Posts : 2136
Join date : 2011-01-11
Age : 36
Location : Warren, MA

PostSubject: Re: Random knock   Tue Jul 03, 2012 9:16 pm

Take the egr valve tube off the intake side and see if that hole is plugged up solid.
Back to top Go down
CrashMaster

avatar

Posts : 189
Join date : 2011-12-05

PostSubject: Re: Random knock   Tue Jul 03, 2012 10:22 pm

I will check that soon. Thanks for the reply.

To add more info...... There is no ryme or rythem to the knocking. Hot or cold that is. It's never at idle though. Always under throttle. Also it has been hard to start alot in the mornings lately which is probably related.
Back to top Go down
Ironfistdog

avatar

Posts : 2136
Join date : 2011-01-11
Age : 36
Location : Warren, MA

PostSubject: Re: Random knock   Tue Jul 03, 2012 11:08 pm

What year lt1? Any codes or CEL?
IAC been replaced?
clean the MAF?
Back to top Go down
CrashMaster

avatar

Posts : 189
Join date : 2011-12-05

PostSubject: Re: Random knock   Tue Jul 03, 2012 11:31 pm

96. IAC? Not familiar. Never cleaned the MAF.... Heard that can cause more harm than good. No dash lights.
Back to top Go down
IMPALADAKID
Admin
avatar

Posts : 1525
Join date : 2009-01-17
Age : 49

PostSubject: Re: Random knock   Wed Jul 04, 2012 6:54 am

CrashMaster wrote:
96. IAC? Not familiar. Never cleaned the MAF.... Heard that can cause more harm than good. No dash lights.
Just because there is no light does not mean there are no codes. If you don't have a code reader, bring it to autozone. The one near me uses a scanner that can see past codes, and soft codes.

To clean a MAF safely, and gently. Remove it from the car, hold it in your hand with the engine side pointed at you. Take a couple Q-tips saturated with rubbing alcohol on them and reach in and wipe the three diodes. You have to be very gentle. Bend the Q-tip so you can get the back side of the diode. Let the alcohol do the work. I have cleaned MAFs this way for over 20 years with great results.

_________________
1980 Cadillac Coupe DeVille. 6.0 87k
2017 Chevrolet Silverado LT 4.3 Aluminum V6 (My daily)
2008 Saab 9.3 convertible (Wife's Daily)
Back to top Go down
SPCS

avatar

Posts : 122
Join date : 2012-02-17
Age : 40
Location : Stuttgart, Germany

PostSubject: Re: Random knock   Thu Jul 05, 2012 12:15 pm

It's always the Opti.
Back to top Go down
http://www.oldschoolcustoms.de
CrashMaster

avatar

Posts : 189
Join date : 2011-12-05

PostSubject: Re: Random knock   Thu Jul 05, 2012 2:15 pm

No codes at auto zone. Egr replaced, pcv valve replaced. Still no luck.

Are you serious about it being the opti? Would it be an intermittent issue like this if it were the opti?

Trying plugs tonight.....
Back to top Go down
SPCS

avatar

Posts : 122
Join date : 2012-02-17
Age : 40
Location : Stuttgart, Germany

PostSubject: Re: Random knock   Fri Jul 06, 2012 2:04 pm

At this stage, the Opti really isn't more likely to be the source of the problem than a lot of other things. It just always ends up actually being the source, for me, anyways.

It certainly can fail in the most bizarre, intermittent, coming-and-going ways. Never had a MAF do that to me - but in any case, cleaning the MAF is a better place to start than replacing the distributor.
Back to top Go down
http://www.oldschoolcustoms.de
IMPALADAKID
Admin
avatar

Posts : 1525
Join date : 2009-01-17
Age : 49

PostSubject: Re: Random knock   Fri Jul 06, 2012 2:16 pm

If you are getting a random knock and a loss of power, it might be that you need to do an engine flush and replace with fresh oil and filter after. The knock sensors will detect knock, and the PCM will pull timing. This might be the loss of power you feel. If you do a motor flush and oil change, and the knock continues, you might try and find a LT4 knock module. I don't like them on a stock valve train motor, but in your case it may be an idea.

_________________
1980 Cadillac Coupe DeVille. 6.0 87k
2017 Chevrolet Silverado LT 4.3 Aluminum V6 (My daily)
2008 Saab 9.3 convertible (Wife's Daily)
Back to top Go down
Sponsored content




PostSubject: Re: Random knock   

Back to top Go down
 
Random knock
Back to top 
Page 1 of 1
 Similar topics
-
» Random Happenings variant (rules + cards)
» Looking for a lt4 knock module or an lt1 pn's in post.
» Random Happenings for a Mine setting
» Red's Random Challenger March 2011 is me!
» The Random Mai-HiME/Otome Emote FREE RP! ANYONE CAN JOIN!

Permissions in this forum:You cannot reply to topics in this forum
BADASS of New England :: 91-96 B & D-body tech :: Problems / Maintenance-
Jump to: