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Discussion Starter · #1 ·
I've been away from home for 40 days and couldn't drive my car for that long.
When I came back and turned on the engine I've heard a blast the very moment I hit the start button.
It was very noisy. I tuned off and on again a couple of times and didn't hear anything unusual.
Does anybody know why ?
I can tell you that blast was... impressive


ciao
 

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Did it come from the front / engine bay area or the rear / exhaust area?

What kind of blast tone, popping noise, grinding noise? Any more specifics?
 

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Discussion Starter · #4 ·
Did it come from the front / engine bay area or the rear / exhaust area?

What kind of blast tone, popping noise, grinding noise? Any more specifics?

It was like a gunshot when I pressed the start button and I'm 100% sure it came from the exhaust on the back
 

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It was like a gunshot when I pressed the start button and I'm 100% sure it came from the exhaust on the back
Got it. I think that reinforces Patrick Hayes comment. You might have had some friends nestled in your exhaust..

You might want to give other areas of your car a once over as well. Inspect any visible wires for chew marks or other debris.
 

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Where was your car parked? Did you notice any evidence of external combustion?
 

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I've been away from home for 40 days and couldn't drive my car for that long.
When I came back and turned on the engine I've heard a blast the very moment I hit the start button.
It was very noisy. I tuned off and on again a couple of times and didn't hear anything unusual.
Does anybody know why ?
I can tell you that blast was... impressive


ciao
Hi wincenzo,

Sorry to hear about this! If it happens again and/or if you decide to visit a certified dealership for further diagnosis I'd be happy to offer assistance if needed. Just send us a PM with your VIN and let me know.

Andrea
Alfa Romeo Social Care Specialist
 

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You may have had some unburnt fuel in your tailpipe. Once you applied voltage to the system or closed the circuit by pressing the button, whatever static or charge that became available grounded and lit it off. This can happen on my Miata, particularly because it uses an ecool extra fuel injection system. If you get on it on the way home, there may be a few drops of fuel in the intake the next time you start the car. Or it could be a tired idle control valve. Mine can both pop and groan, as if some fuel is lighting off or the idle control valve is trying to reach a resting position when it's cold and suddenly under voltage. I also have a long aluminum intake so it magnifies the sound.

No telling how much fuel may get past the valves when under boost in the Quad. I suspect that was it. My Miata was worse when I had shorts in the fuel injector harness causing dropped fuel. It would end up in a flooded state so when I went to try and start it, raw gas would be pushed down the tail pipe too rich to burn until it found enough O2 out the back to light off. Classic backfire, POW!
 
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You may have had some unburnt fuel in your tailpipe. Once you applied voltage to the system or closed the circuit by pressing the button, whatever static or charge that became available grounded and lit it off. This can happen on my Miata, particularly because it uses an ecool extra fuel injection system. If you get on it on the way home, there may be a few drops of fuel in the intake the next time you start the car. Or it could be a tired idle control valve. Mine can both pop and groan, as if some fuel is lighting off or the idle control valve is trying to reach a resting position when it's cold and suddenly under voltage. I also have a long aluminum intake so it magnifies the sound.

No telling how much fuel may get past the valves when under boost in the Quad. I suspect that was it. My Miata was worse when I had shorts in the fuel injector harness causing dropped fuel. It would end up in a flooded state so when I went to try and start it, raw gas would be pushed down the tail pipe too rich to burn until it found enough O2 out the back to light off. Classic backfire, POW!
While that makes sense, would the backfire's intensity be exacerbated by extending the time between shut-down and the next start? 40 days makes me think of Noah.
 

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Discussion Starter · #10 ·
Hi wincenzo,

Sorry to hear about this! If it happens again and/or if you decide to visit a certified dealership for further diagnosis I'd be happy to offer assistance if needed. Just send us a PM with your VIN and let me know.

Andrea
Alfa Romeo Social Care Specialist

thanks ! very much appreciated
 

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Discussion Starter · #11 ·
You may have had some unburnt fuel in your tailpipe. Once you applied voltage to the system or closed the circuit by pressing the button, whatever static or charge that became available grounded and lit it off. This can happen on my Miata, particularly because it uses an ecool extra fuel injection system. If you get on it on the way home, there may be a few drops of fuel in the intake the next time you start the car. Or it could be a tired idle control valve. Mine can both pop and groan, as if some fuel is lighting off or the idle control valve is trying to reach a resting position when it's cold and suddenly under voltage. I also have a long aluminum intake so it magnifies the sound.

No telling how much fuel may get past the valves when under boost in the Quad. I suspect that was it. My Miata was worse when I had shorts in the fuel injector harness causing dropped fuel. It would end up in a flooded state so when I went to try and start it, raw gas would be pushed down the tail pipe too rich to burn until it found enough O2 out the back to light off. Classic backfire, POW!

Thanks, that makes sense. Anyway it didn't happen again up until now and I'm using the car on a daily basis now
 

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I am headed back east to visit my car on Monday. my car has sat for approx. 40 days as well. I will let you know how my car fires up for comparison. did you have the car on a battery tender? if not, did the car hold the charge? please advise.


I cannot wait to drive her!!!
 

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i was reunited w/ my beloved qv today after 42 days. I had her on a battery tender while I was on the west coast.


she started up perfectly and w/ no drama this morning w/ 35 degree weather. **** I love this car!!!!
 

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Discussion Starter · #14 ·
No I haven't used a battery tender the battery was ok. I've been using the car very often recently with many on/off and didn't notice anything unusual, so it's been a one time thing
 

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i was reunited w/ my beloved qv today after 42 days. I had her on a battery tender while I was on the west coast.


she started up perfectly and w/ no drama this morning w/ 35 degree weather. **** I love this car!!!!

@ferraripete: what kind of battery tender do you use and how it work?
Current sourse, bonnet open etc..
Thank you.
 

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You may have had some unburnt fuel in your tailpipe. Once you applied voltage to the system or closed the circuit by pressing the button, whatever static or charge that became available grounded and lit it off. Classic backfire, POW!
That's what put me in the hospital in December.
 

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Yikes! I am loving my car too. No issue starting in the winter cold so far. What I really love is the knowledge that my steering wheel is repaired and can actually enjoy the car now. But I am still waiting for my touch up paint, finishing the side skirt wrap, and the purchasing the exhaust controller for install in the spring
 

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@ferraripete: what kind of battery tender do you use and how it work?
Current sourse, bonnet open etc..
Thank you.

I am using a "battery tender" brand. it is not as advanced as the cytek but when I was leaving back for san diego after buying the car, I needed something. I sourced it at the walmart automotive repair side of the store.


I have not hard wired it as I was time restricted when I last left the car. I will however hard wire it on this trip east.


I left the car with the trunk/boot closed over the battery tender cord. I was worried about the light being on the entire time I was gone. all was fine when I returned.


now, I have been able to drive the car about 10 miles since returning to nc and then the snow hit! I will not drive the qv in foul weather as I just love this car too much to dirty her. I am now hoping for the snow to melt and a good rain to follow so I can drive this lady again soon!!!! **** snow!!!!
 

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Yikes! I am loving my car too. No issue starting in the winter cold so far. What I really love is the knowledge that my steering wheel is repaired and can actually enjoy the car now. But I am still waiting for my touch up paint, finishing the side skirt wrap, and the purchasing the exhaust controller for install in the spring

john, trust me, you will be so comforted when you have the rockers wrapped. they are really out there to have road debris pepper. wrap those babies and enjoy the car and no more lost sleep:))
 
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