I have a problem with my 2004 Impala 3400 sfi that I need some help with.
When idling or driving for a length of time that seems to vary, but usually more than 45 minutes, the car will shut off like you just turned the key to the acc position. No check engine light, no stumbling, no drama. All the lights stay on and everything seems normal except for the car is off and won't start again. It won't start for anywhere from 3-10 to ten minutes, and then runs fine again for a while.
I have taken a video that shows that after it shuts off like this, there is no spark (the video is shaking but trust me). I've also seen twice now a good sized puff of white smoke coming from the throttle body area or towards the firewall from there, and a bit of a smell that I can't exactly locate. Also i've noticed a noise that I don't think I've heard before, it occurs about 19 seconds into the video.
https://youtu.be/d76DvmIt_C8
I am prepared to do troubleshooting. I have a DVOM and an OBDII interface with Torque Pro for android.
The only thing changed even recently was the fuel pump and relay. I tested the fuel pressure during the no start condition and I appear to be getting fuel, just no spark. I can't get a noid light on the injectors as it looks like the whole upper intake has to come off to get at them.
My wallet is very thin and I cannot afford to take this anyplace so I'm hoping you all can help.
When idling or driving for a length of time that seems to vary, but usually more than 45 minutes, the car will shut off like you just turned the key to the acc position. No check engine light, no stumbling, no drama. All the lights stay on and everything seems normal except for the car is off and won't start again. It won't start for anywhere from 3-10 to ten minutes, and then runs fine again for a while.
I have taken a video that shows that after it shuts off like this, there is no spark (the video is shaking but trust me). I've also seen twice now a good sized puff of white smoke coming from the throttle body area or towards the firewall from there, and a bit of a smell that I can't exactly locate. Also i've noticed a noise that I don't think I've heard before, it occurs about 19 seconds into the video.
https://youtu.be/d76DvmIt_C8
I am prepared to do troubleshooting. I have a DVOM and an OBDII interface with Torque Pro for android.
The only thing changed even recently was the fuel pump and relay. I tested the fuel pressure during the no start condition and I appear to be getting fuel, just no spark. I can't get a noid light on the injectors as it looks like the whole upper intake has to come off to get at them.
My wallet is very thin and I cannot afford to take this anyplace so I'm hoping you all can help.
