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 is 1 user online :: 0 Registered, 0 Hidden and 1 Guest :: 1 Bot

None

Most users ever online was 132 on Wed Oct 04, 2017 3:26 pm
Latest topics
» In search of a 1996 knock module URGENT
Fri May 11, 2018 3:31 pm by fatvet

» Allagash Wilderness Waterway Canoe Trip 2018
Wed May 02, 2018 8:24 am by boojum

» Collected RMW stuff for 22 years--time for it to go!
Tue May 01, 2018 10:05 am by silverfox103

» HEY HOW AH YAH?
Wed Apr 25, 2018 4:28 pm by fatvet

» Looking for 91-96 RMW for sale
Mon Apr 23, 2018 12:21 pm by Wawa

» WTB: caprice taillights
Fri Apr 20, 2018 3:36 pm by fatvet

» Transmission temp sensor help..
Sun Mar 11, 2018 2:41 pm by Ironfistdog

» WTB: 235/70/R15 tires
Mon Jan 15, 2018 8:42 pm by demilo

» Triumph C 7000 Lift
Mon Jan 08, 2018 1:56 am by demilo

Search
 
 

Display results as :
 
Rechercher Advanced Search
May 2018
MonTueWedThuFriSatSun
 123456
78910111213
14151617181920
21222324252627
28293031   
CalendarCalendar

Share | 
 

 Backfireing under the hood on startup

Go down 
AuthorMessage
cloud 9

avatar

Posts : 563
Join date : 2009-10-03
Age : 50
Location : Dover, NH

PostSubject: Backfireing under the hood on startup   Thu Oct 13, 2011 6:42 pm

Last couple days whenever I start the Caprice it pops from under the hood when I give it any gas for the first 30 seconds it is running. After that she is fine, normal. Any input?????
Back to top Go down
bowtiepimp

avatar

Posts : 1566
Join date : 2010-06-19
Age : 33
Location : working a corner near you

PostSubject: Re: Backfireing under the hood on startup   Thu Oct 13, 2011 7:05 pm

cloud 9 wrote:
Last couple days whenever I start the Caprice it pops from under the hood when I give it any gas for the first 30 seconds it is running. After that she is fine, normal. Any input?????



LT1 car? if so..... sounds like an opti.....
Back to top Go down
Ironfistdog

avatar

Posts : 2133
Join date : 2011-01-11
Age : 36
Location : Warren, MA

PostSubject: Re: Backfireing under the hood on startup   Thu Oct 13, 2011 7:47 pm

Check your air intake elbow for holes, also check the MAF and IAC. Any Sticking valves?
Back to top Go down
Guest
Guest



PostSubject: Re: Backfireing under the hood on startup   Thu Oct 13, 2011 8:05 pm

OPTI!!!!!!!!!!!!!
Back to top Go down
cloud 9

avatar

Posts : 563
Join date : 2009-10-03
Age : 50
Location : Dover, NH

PostSubject: Re: Backfireing under the hood on startup   Sun Oct 16, 2011 2:16 pm

So just cause it was easy and inexpensive I replaced the fuel filter. Still doing it though. Weird, it only does it for the first 60 seconds after cold start then runs and starts easy after warmed up, responsive as normal. I have looked all around the engine compartment nothing disconnected or cracked. I believe it has the original opti in it. 80k miles and 17+ years old, sounds like that may be my next option. Any other ideas before I get into it would be appreciated. scratch scratch scratch
Back to top Go down
bowtiepimp

avatar

Posts : 1566
Join date : 2010-06-19
Age : 33
Location : working a corner near you

PostSubject: Re: Backfireing under the hood on startup   Sun Oct 16, 2011 2:36 pm

IMPALADAKID wrote:
OPTI!!!!!!!!!!!!!




Sleep
Back to top Go down
Machine-De-Zine

avatar

Posts : 512
Join date : 2010-11-16
Age : 61
Location : Wrentham

PostSubject: Re: Backfireing under the hood on startup   Sun Oct 16, 2011 3:35 pm

bowtiepimp wrote:
IMPALADAKID wrote:
OPTI!!!!!!!!!!!!!




Sleep

Sounds like possibly a "lean-pop" backfire.

Check for anything that delivers the necessary rich fuel mixture required when cold.

The computer needs to know various temps though-out the engine systems.

O2, coolant temps, A/F ratio, Etc. The FSM (factory service manual) has excellent procedures for tracking down the cause.

The normal hot engine fuel ratios will be too lean while flowing through the cold intake runners, condensing on the cool surfaces.
Back to top Go down
cloud 9

avatar

Posts : 563
Join date : 2009-10-03
Age : 50
Location : Dover, NH

PostSubject: Re: Backfireing under the hood on startup   Sat Oct 22, 2011 10:06 am

Put in a new coolant temp sensor. Everything ok now. Cheap fix, very happy. cheers Thanks for the advise guys.
Back to top Go down
Matt Trakker

avatar

Posts : 5087
Join date : 2009-07-30
Age : 36
Location : Reading, MA

PostSubject: Re: Backfireing under the hood on startup   Sat Oct 22, 2011 10:50 am

Nice!
Back to top Go down
Sponsored content




PostSubject: Re: Backfireing under the hood on startup   

Back to top Go down
 
Backfireing under the hood on startup
Back to top 
Page 1 of 1

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: