Backfiring - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Problems and Service Talk about any mechanical problems you are having

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post #1 of 14 (permalink) Old 01-14-2014, 10:16 AM Thread Starter
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Backfiring

Ok when I really give it gas it hesitates and back fires into the carb.
Then kind takes off but nothing seems it should been kind like that sense bought it don't really hammer on it but when I do this happens
And since owning it sulfur smell once in awhile and dealer told me it's the gas I'm using, use the top ter. Gas stations... Had the fuel system cleaned out at the mileage recommend...and still does this
Is this the Cadillac convert doing this?
Dealer said a light will light up if that happens so I'm stumped?
And ideas would help?

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post #2 of 14 (permalink) Old 01-14-2014, 10:26 AM
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First off cobalts have a throttle body and second a bad cat can smell like rotten eggs or so i heard but dont think that would make it pop threw the throttle body

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post #3 of 14 (permalink) Old 01-14-2014, 10:31 AM Thread Starter
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Sorry old school here...yeah back fires through it...pop pop and takes off....sometimes 3 or 4 pops an takes off....

---------- Post added at 10:31 AM ---------- Previous post was at 10:29 AM ----------

Only when I really get on it.....if I wanta race someone hell no I'm back still pop pop pop take off.....

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post #4 of 14 (permalink) Old 01-14-2014, 10:31 AM
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Backfires through the intake are usually a timing issue and through exhaust is usually a fuel mixture problem I do believe

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post #5 of 14 (permalink) Old 01-14-2014, 10:33 AM Thread Starter
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Had a jeep and did the about same thing but when it went ya couldn't give it any gas it would pop through the throttle body....

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post #6 of 14 (permalink) Old 01-14-2014, 10:37 AM
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If you take it to a mechanic he can probably fix it fairly easily. They aren't usually a major problem

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post #7 of 14 (permalink) Old 01-14-2014, 11:40 AM
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You sure it isn't trying to transform?

And how can you be old school? You phrase your sentences like a 5th grader.
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post #8 of 14 (permalink) Old 01-14-2014, 11:51 AM
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Quote:
Originally Posted by Jasper Clap View Post
You sure it isn't trying to transform?

And how can you be old school? You phrase your sentences like a 5th grader.
Lol

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---------- Post added at 02:50 PM ---------- Previous post was at 02:49 PM ----------

Sure it's not the fuel you use? What octane do you use?


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---------- Post added at 02:51 PM ---------- Previous post was at 02:50 PM ----------

Quote:
Originally Posted by swanman35 View Post
Backfires through the intake are usually a timing issue and through exhaust is usually a fuel mixture problem I do believe

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Your right if the cat is back it stinks bad! There's a bad cat on my work truck and boooy does it steel like rotten eggs lol

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post #9 of 14 (permalink) Old 01-14-2014, 04:19 PM Thread Starter
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Lol maybe that it ready to transform into a plane and fly outta here...

---------- Post added at 04:16 PM ---------- Previous post was at 04:13 PM ----------

Use the 89 what the book calls for was told by the dealer anything else would be worse...lowest octane.... So change the octane? Use nothing but the top ter gas stations gm recommends.....mobile and shell....

---------- Post added at 04:19 PM ---------- Previous post was at 04:16 PM ----------

It stinks really when I hammer it....then ya really smell it...but last cad (on the jeep)went it just went no sign just jumped in a started up but as soon as I give it gas it would back fire, spit and sputter and couldn't go over 5-10mph....good thing the shop was near by...

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post #10 of 14 (permalink) Old 01-14-2014, 06:06 PM
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It sounds like you have a clogged cat. Get the cat changed and call it a day. It can make a backfire as the fuel trims are WAY off because of the bad cat and mis-readings of the rear 02 sensor. The smell is the way you can tell.

If you're not having any other issues with it running, to include sounds, then it's not timing.

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