Backfiring/flame through TBI - Chevrolet Forum - Chevy Enthusiasts Forums

Go Back   > >
Log In 

General Tech Good at troubleshooting? Have a non-specific issue? Discuss general tech topics here. IF YOUR QUESTION IS SPECIFIC TO A CERTAIN MODEL, IT DOES NOT GO IN THIS SECTION.

LinkBack Thread Tools Search this Thread
Old 06-07-2007, 12:20 AM
Thread Starter
Join Date: Jun 2007
Posts: 4
Default Backfiring/flame through TBI

I've recently pulled and replacedthe heads on my 1990, 350 tbi, and now it won't start. I have spark and fuel to the throttle body. I have also set the rocker arms to one turn past zero lash. I initially thought the timing might be out 180 deg., but have tried the timing both from tdc and 180deg. When I try to start the truck, it coughs and backfires through the throttle body, and has even thrown flames. The truck has sat for almost 2 years, and is old fuel, but it seems to burn all right in the intake This one has me stumped. Any suggestions?
Reply With Quote
Old 06-11-2007, 10:44 AM
Join Date: Mar 2007
Posts: 40
Default RE: Backfiring/flame through TBI

Gotta be in your timing. You do anything with the cam or timing chain? Could you have either a tooth missing on the timing gear or the chain jumped.
Double check your distribuor orienation starting at TDC.
Also, check your valve springs, rocker arms and push rods. Make sure the valves are really opening and closing.
Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
05 silverado backfiring through the carborator Mitnelson Express & G-Series Vans 1 07-06-2014 04:05 PM
Quit while towing now backfiring through the intake Tndellis Silverado & Fullsize Pick-ups 4 04-05-2014 07:29 PM
backfiring through the intake tommyboy8072002 General Tech 5 01-06-2014 01:01 AM
94 silverad 5.7L backfiring through tbi only when hot lonewolf1980rc General Tech 2 12-07-2013 02:38 PM

350, backfire, backfires, backfiring, body, chevy, distribuor, flames, gm, intake, starting, tbi, throttle, tooth, truck

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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

All times are GMT -5. The time now is 07:57 AM.