5.3 bogging/stumbling - LS1TECH - Camaro and Firebird Forum Discussion



Carbureted LSX Forum Carburetors | Carbed Intakes | Carb Tuning Tips for LSX Enthusiasts

5.3 bogging/stumbling

Reply
 
Thread Tools Search this Thread
Old 01-06-2017, 06:01 PM   #1
Teching In
Thread Starter
 
Join Date: Jul 2016
Location: Gulfport, Ms
Posts: 4
Unhappy 5.3 bogging/stumbling

What's up guys ? Been lurking for a minute trying to soak up information, but I'm at a dead end at the moment with my swap. I have a 5.3 with a 670 holley on it and every time I accelerate from a red light or stop and go it stumbles like it wants to die. The carb was sitting up awhile. So, i put in new gaskets, float, accelerator pump, and a bigger squirter (31). I did notice the other day once the car gets warm up it stumbles just a little bit but not to the point I'm going 5 mph waiting for it to go. ????

Stock 5.3/LM7
MSD 6014 LS1 timing selected
TH350
Eazy228 is offline   Reply With Quote
Old 01-06-2017, 09:38 PM   #2
TECH Resident
iTrader: (2)
 
baronsmith98's Avatar
 
Join Date: Feb 2013
Location: Brunswick, GA
Posts: 809
Default

Is it stumbling while getting on the gas hard or gradually getting on the gas? What is you fuel level set at and fuel pressure?
baronsmith98 is online now   Reply With Quote
Old 01-07-2017, 02:31 AM   #3
Teching In
Thread Starter
 
Join Date: Jul 2016
Location: Gulfport, Ms
Posts: 4
Default

stumbling while gradually getting on the gas like just trying to cruise. I got the regulator set at 6 psi
Eazy228 is offline   Reply With Quote
Old 01-07-2017, 02:31 AM   #4
Teching In
Thread Starter
 
Join Date: Jul 2016
Location: Gulfport, Ms
Posts: 4
Default

Its a walbro pump inline.
Eazy228 is offline   Reply With Quote
Old 01-07-2017, 11:09 PM   #5
On The Tree
 
Join Date: Jul 2015
Posts: 148
Default

Do you have a afr gauge? I assume not, but I would recommend one.

I'd make sure that the float level is right first. Do you have a MAP sensor hooked up? Make a reference mark on the balancer for any one of the cylinders and use a timing light just to see if it's advancing properly.

I am currently tuning a stock 5.3 as well, and in order to get it right I had to use the #35 squirter and the blue cam, needs a really aggressive shot, but right now this most likely wouldn't help if you're only gradually accelerating. Does aggressively accelerating make the problem disappear, or get worse?
Greg.H is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
95 z28 383 stroker d1 procharger. Bonemaroz28 LT1-LT4 Modifications 15 05-16-2017 04:09 AM
Hesitation and Stumble under load LS1 Snaps Generation III External Engine 7 11-20-2016 05:08 PM
Lean spot in acceleration Greg.H Carbureted LSX Forum 30 07-21-2016 06:59 PM
Engine stumbling flashing check engine racinnc PCM Diagnostics & Tuning 0 06-07-2016 10:13 AM
LS stumbles under acceleration Angry73 Generation III External Engine 5 04-06-2016 04:57 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -5. The time now is 12:32 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: