Backfire on start up...wtf over!?
05-23-2009, 02:15 PM
#1
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Backfire on start up...wtf over!? Sometimes when I start it up and give it gas...it gives a small backfire. What causes this? I think it started doing it after the SLP tune.
05-23-2009, 05:28 PM
#2
Also, do you ever get smoke trails when you hit the gas from a cruising speed of like 60mph?
See if you have any oil on any of your spark plug threads. The only thing I can think of is that maybe you have a bad valve seal(s) and its leaking oil onto one or more plugs AFTER shutdown. Then when you start it up a spark plug may not fire properly till that dried/burnt up oil that is stuck to the spark plug comes off the plug. The fuel thats going in there though accumulates and pools, then when it does fire its a backfire.
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05-25-2009, 02:00 AM
#4
I've had the same thing happen, start the car up and go to pull out onto the road. If my rpms go over 3k and I let off the gas quick I get this LOUD pop noise sometimes.
Also I did notice when I was changing my spark plugs that one of them had fresh oil on the end of it.
Also I did notice when I was changing my spark plugs that one of them had fresh oil on the end of it.
05-25-2009, 02:08 AM
#5
I've had the same thing happen, start the car up and go to pull out onto the road. If my rpms go over 3k and I let off the gas quick I get this LOUD pop noise sometimes.
Also I did notice when I was changing my spark plugs that one of them had fresh oil on the end of it.
Also I did notice when I was changing my spark plugs that one of them had fresh oil on the end of it.
Next time you start it up when its cold, hold the rpm's steady with pedal at say 1,200 rpm. Just hold it there, see if the rpm's start to climb little by little by itself while it warms up (don't move the pedal at all). Thats the **** burning off the electrodes making a better spark each time it lights.
05-25-2009, 02:17 AM
#6
Yeah, you both may have the same issue. It takes a bit to get the oil that dries and gums up on the electrode part of the spark plug AFTER shutdown. The spark plug is still hot as **** and the oil that drips onto it sticks to it like glue. After it burns off you can cruise away.
Next time you start it up when its cold, hold the rpm's steady with pedal at say 1,200 rpm. Just hold it there, see if the rpm's start to climb little by little by itself while it warms up (don't move the pedal at all). Thats the **** burning off the electrodes making a better spark each time it lights.
Next time you start it up when its cold, hold the rpm's steady with pedal at say 1,200 rpm. Just hold it there, see if the rpm's start to climb little by little by itself while it warms up (don't move the pedal at all). Thats the **** burning off the electrodes making a better spark each time it lights.
05-25-2009, 06:45 PM
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Yeah, you both may have the same issue. It takes a bit to get the oil that dries and gums up on the electrode part of the spark plug AFTER shutdown. The spark plug is still hot as **** and the oil that drips onto it sticks to it like glue. After it burns off you can cruise away.
Next time you start it up when its cold, hold the rpm's steady with pedal at say 1,200 rpm. Just hold it there, see if the rpm's start to climb little by little by itself while it warms up (don't move the pedal at all). Thats the **** burning off the electrodes making a better spark each time it lights.
Next time you start it up when its cold, hold the rpm's steady with pedal at say 1,200 rpm. Just hold it there, see if the rpm's start to climb little by little by itself while it warms up (don't move the pedal at all). Thats the **** burning off the electrodes making a better spark each time it lights.
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05-25-2009, 07:08 PM
#8
Nothing at all wrong with driving around like that for years if you want to. I would just recommmend to NEVER get on the gas until that **** burns off and there is NO MORE misfiring and stumbling. Wait till it clears up before you drive off. You can hurt the engine badly by accelerating while you are misfiring and detonating and stumbling.
05-25-2009, 07:22 PM
#9
IF.....it is a bad valve seal(s), then the only way to fix it is to remove the head(s) and get new seals put in. Time consuming job, but not too expensive.
Nothing at all wrong with driving around like that for years if you want to. I would just recommmend to NEVER get on the gas until that **** burns off and there is NO MORE misfiring and stumbling. Wait till it clears up before you drive off. You can hurt the engine badly by accelerating while you are misfiring and detonating and stumbling.
Nothing at all wrong with driving around like that for years if you want to. I would just recommmend to NEVER get on the gas until that **** burns off and there is NO MORE misfiring and stumbling. Wait till it clears up before you drive off. You can hurt the engine badly by accelerating while you are misfiring and detonating and stumbling.
Could running lean cause this?
Last edited by epox4life; 05-25-2009 at 07:29 PM.
