Help!!! Explosion and smoke coming from intake grill!

[Dgnarvs]

Originally Posted by tnoice

This might give you some information about the code

Erratic Idle Code P1502 - 986 Series (Boxster, Boxster S) - RennTech.org Forums

now, I also have to worry about the DME!!!

I just wonder whether the battery replacement, explosion/smoke had anything to do with all these issues or whether it was simply a coincidence?!

[Homeboy981]

When you "jump started" the car where were the + and - connections connected?

Pcars are finicky about WHERE you place the jumper cables. Improperly connecting those could be an issue. Notwithstanding that, clean the TB and intake system first. Before you touch the MAF - disconnect the battery (using the negative post). Leave 'unbatteried' for at least 30 minutes - it should take a lot longer to clean the intake system.

Otherwise, my money would be on an AOS. You will be able to see how much 'blowby' is there once you remove the intake. Please consult our DIY here to make sure you do it correctly. This is one of the first things I did to my car and it was disgusting! Make sure you have plenty of paper towels standing by.

Good Luck!

[Dgnarvs]

Originally Posted by Homeboy981

When you "jump started" the car where were the + and - connections connected?

Pcars are finicky about WHERE you place the jumper cables. Improperly connecting those could be an issue. Notwithstanding that, clean the TB and intake system first. Before you touch the MAF - disconnect the battery (using the negative post). Leave 'unbatteried' for at least 30 minutes - it should take a lot longer to clean the intake system.

Otherwise, my money would be on an AOS. You will be able to see how much 'blowby' is there once you remove the intake. Please consult our DIY here to make sure you do it correctly. This is one of the first things I did to my car and it was disgusting! Make sure you have plenty of paper towels standing by.

Good Luck!

Thanks, HB. I wouldn't suspect that the jump was an issue as the car managed to reach the shop from the house in one piece and without any issues. The problem only materialized after the new battery was installed.

Anyway, I had a suspicion that the AOS needed replacement as there was the telltale smoke the last time I used he car a few weeks back. Stupidly, I ordered the wrong part from Pelican so the right part has not yet arrived. Maybe the 'explosion' was the extreme result of the defective AOS? Not sure though if replacing the AOS would be sufficient to remove the fault code 412.

[Dgnarvs]

The more I read about it, it makes me wonder how all of these are connected.

My theory is that somehow, the intake plenum boots got detached upon start up with the new battery. Maybe there was too much gas vapor inside the engine during the hard cranking when the car was being started using the old weak battery or perhaps during the jump start. The excess vapor when combusted might have produced sufficient pressure to 'blast' out the plenum boots.

Why is there now a fault code 412? My guess is that the 'explosion' could have messed with the throttle jacking sensor and/or the throttle body. Or maybe the throttle body is just really dirty.

I am inclined to think that the problem is mechanical (well, the throttle jacking sensor is of course electronic but it may have been damaged physically) because of the 'explosion', and not the electronic failure of the DME.

I've got an engineering degree...but in a completely different field so I wouldn't be surprised if everything I've just said is pure nonsense to the technically minded!

So I would appreciate any help you guys can offer. I just need to know a starting point on which parts to order. My car is in Manila so I need to source parts online and take to account the longer shipping time.

Thanks y'all!