Back fire
Thread Starter
Intermediate
Joined: Apr 2015
Posts: 47
Likes: 1
Back fire
changed intake manifold and carb
carb in street demon and edlbrock intake
when car is idling good and runs not bad but when i step on the gas it back fires. .it hesitates and the back fires any ideas timing is at 8 degease i am going to check to make sure my plug wires are corect
carb in street demon and edlbrock intake
when car is idling good and runs not bad but when i step on the gas it back fires. .it hesitates and the back fires any ideas timing is at 8 degease i am going to check to make sure my plug wires are corect
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,809
From: Cool Northern Michigan
I will throw some ideas at ya.
Lean condition?
Intake gasket not sealed 100% at the heads.
Carb base gasket not sealing.
Vacuum port fittings did not get thread sealant when installed.
Vacuum hoses to carb are loose.
Number 5 & 7 plug wires too close together.
Carb needs richer adjustments / tuning.
Lean condition?
Intake gasket not sealed 100% at the heads.
Carb base gasket not sealing.
Vacuum port fittings did not get thread sealant when installed.
Vacuum hoses to carb are loose.
Number 5 & 7 plug wires too close together.
Carb needs richer adjustments / tuning.
Last edited by HeadsU.P.; May 13, 2018 at 07:06 PM.
Tech Contributor
Joined: Aug 1999
Posts: 14,370
Likes: 6,364
From: At my Bar drinking and wrenching in Lafayette Colorado
Backfire up through the carb is a sign of a lean condition, caused either by vacuum leaks, or by the carb being too lean (most likely). Carb lean condition can also be caused by a lean pump shot.
Contributing to this is your retarded timing. Get some timing into that thing!...
Lars
Last edited by lars; May 13, 2018 at 11:30 PM.
Is my vette stock?? HAHA
Joined: Oct 2015
Posts: 20,111
Likes: 9,239
From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
2020 Corvette of the Year Finalist (performance mods)
2019 C3 of Year Winner (performance mods)
2016 C3 of Year Finalist
read Lars' paper on timing
Last edited by Rescue Rogers; May 14, 2018 at 08:23 AM.
