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Old 01-28-2013, 12:48 PM   #1 (permalink)
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No Start...Intake Explosion

Car 2007 si 118k
The car has been sitting not being used since saturday night.
Outdoor temp below freezing.
I go out to start the car this morning and it wont start.
I checked the oil and the coolant all is good.
Plugs have been changed within the last 12k
So i start cranking it again and it still wont start, so i stop then crank it again this time pushing on the accelerator pedal just for *****, and then the intake box literally exploded and blew all the tabs off and the filter out of the engine compartment. This is the first time ive ever seen an intake explode during a no start. Car ran absolutely fine prior to this.
Anyone know what it could possibly be?
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Old 01-28-2013, 01:20 PM   #2 (permalink)
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No Start...Intake Explosion

Your tailpipe isn't plugged with some snow or anything is it?


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Old 01-28-2013, 01:49 PM   #3 (permalink)
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No Start...Intake Explosion

Is it cranking over at its normal speed or does it crank over really fast? Did you smell fuel after or before the intake blew off?
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Old 01-28-2013, 01:50 PM   #4 (permalink)
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wow... In for updates.
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Old 01-28-2013, 01:53 PM   #5 (permalink)
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You most likely flooded the engine and then it backfired. I'd be looking for ignition issues.
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Old 01-28-2013, 02:01 PM   #6 (permalink)
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Old 01-28-2013, 02:09 PM   #7 (permalink)
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how was the Battery life. 8thgens have weak battery life in the cold
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Old 01-28-2013, 02:50 PM   #8 (permalink)
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Quote:
Originally Posted by leveldowen View Post
You most likely flooded the engine and then it backfired. I'd be looking for ignition issues.
Yup, backfire into the intake manifold (a real backfire)

Fuel vapors made their way into the intake and where ignited. When I worked at a dealer I saw this a few times with various cars, including a brand new 2006 Acura RL that wasn't even sold yet.

You may have an ignition timing problem, or it was just REALLY bad luck...

Did your intake mani get ruined? Check your throttle plate to make sure it didn't bend.
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Old 01-28-2013, 03:06 PM   #9 (permalink)
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my manifold is fine. its cranking over just fine. the battery is fine. when cranking it does like a little stumble almost like an attempt to start but then goes back to regular cranking with a stumble here and there almost like its trying to start but doesnt.
i just checked all the fuses and verified that the fuel pump was working...which obviously it was because it backfired thru the manifold. **** is mind boggling.
ill go check the throttle plate although that would be collateral damage and not the root cause.
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Old 01-28-2013, 03:08 PM   #10 (permalink)
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i was about a half quart low on oil but topped that off, and that shouldnt have stopped it. there still should have been enough oil pressure to run the timing chain tensioner. and even then, generally an engine will start with no oil at all, it just wont run for long at all.
Any more ideas?
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Old 01-28-2013, 03:10 PM   #11 (permalink)
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I checked the tailpipe for a clog immediatley after the backfire... that was my thought exactly but all checked out fine. i even went so far as to but my optical camera up the pipe to visually see. no luck in that area.
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Old 01-28-2013, 03:21 PM   #12 (permalink)
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i checked the butterfly on the throttle body....looks fine minus some soot but thats to be expected.
Q: is the butterfly supposed to move when i push it with my finger?
This is my first DBW car, im used to B-series, but when i push on it from the top and bottom it will only move about a 16th of an inch either way. i know on b series cable throttle bodies you can move it fully open by hand but are these different?
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Old 01-28-2013, 03:25 PM   #13 (permalink)
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sounds flooded. I would take the fuel pump fuse out and crank the car for a while to clean out the cylinders. Put the fuse back in and try starting it.
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Old 01-28-2013, 03:30 PM   #14 (permalink)
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No Start...Intake Explosion

Or instead of taking the fuse out just plant your foot flat on the gas pedal to the floor when cranking it and that will shut off fuel supply while you are cranking it.
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Old 01-28-2013, 03:32 PM   #15 (permalink)
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i let the car sit for a couple hours already. do you think the gas if it were flooded would have seeped past the rings already?
Side-note- i just tried to jump it off my v10 work truck and same thing just cranks and minor sputter. no backfire. The only reason i tried that was to see if my CCA were not in line but it checked out. ill unplug the fuse and crank then try again.
Its just odd because this issue just popped up out of nowhere.
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Old 01-28-2013, 03:35 PM   #16 (permalink)
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It sounds like the timing is off to me.
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Old 01-28-2013, 04:51 PM   #17 (permalink)
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^^^ yea thats what im thinking as well. but the only thing that doesnt make sense about that though is the fact that it was perfectly fine when i parked it 2 days ago.
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Old 01-28-2013, 04:56 PM   #18 (permalink)
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also i may add that im not throwing any DTC's
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Old 01-28-2013, 04:59 PM   #19 (permalink)
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Noob question but how can i check the ignition timing. im big on b series but all of this coil on plug crap has me bumfuzzled. can i even use a timing light...well no because the car must be running for that...hmmm
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Old 01-28-2013, 06:13 PM   #20 (permalink)
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ok next thing to try. get brake cleaner or starting fluid and spray into the intake. see if it runs just off of that
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