04 350z -- I have one of those stupid in bumper cold air intakes and rolled thru what I thought was a puddle. Sucked up water and the engine stopped immediately. I was roughly at idle speeds.

Towed it home and I pulled all the plugs, shot a bunch of water out. Changed all the spark plugs to new and it fired right up. But I did have a misfire. The Bluetooth scan tool I have did not/could not read a misfire. I did feel like the idle was rough and felt like a misfire.

I rechecked all the coil packs and spark plugs. I did a compression check and all were sitting at 150-180. I don't have a leak down tester yet. I do have some oil in the cylinders from what I suspect are leaky valve cover seals. (hopefully not leaking down thru the valves) If I had a bent valve then the compression would be zero there right?

After going thru the compression test and reinstalling everything I cannot get it to fire up anymore. I triple checked everything and got it back to original but to no avail. I'm not sure what I would have done to cause it not to run.

I'm a fairly experienced garage mechanic but new to these cars. I do have a 05 G35 as well that if in a pinch i could pull parts off of, but would rather not since it runs perfect.

Ideas?

 

Do you have comprehensive coverage on the vehicle? If so just file a claim

 

So now it just turns over and doesn't start?

 

If it got into the cylinders I would check your oil and make sure none got into it.

If it did change that oil ASAP. If it's got water it will look like coffee with creamer.

 

Yes, it just turns over and not start. I'll check the oil too.

Unfortunately I just have liability.

 

Last time you started it did you just let it run for like 30 seconds and then turn it off?

Try starting it in clear flood mode, foot all the way down on gas pedal, once it starts let up on the gas and dont allow it to rev too high...

 

It ran for about a min. But had the misfire so I shut it off.

Unfortunatly it won't start now. It smells like it's dumping fuel out the tailpipe. What is the best way to test spark for each coilpack? Also would anything about this situation cause oil to be in the cylinders maybe coating some of the spark plugs. When I pulled them they had oil on the tips and these were fresh plugs.

 

Im sure your valve covers are leaking its a common problem.

And your engine is most likely flooded... Try starting with foot all the way down on gas pedal.

 

NEED HELP

I have a 2003 350z and I have recently installed a de-cat exhaust system and now the car runs like **** I've herd a remap will solve this. The car is throwing p0300 code plus 2 exhaust cat codes will the de-cats be causing this misfire

 

why are you hijacking someone else's thread? not to mention, its not even remotely the same issue. typical new member move

 

Instead of being a jackass why don't you point me in the right direction

 

my350z.com there you go lazy ***

 

By flooded im saying flooded with gas in spark plugs not flooded with water in engine.

If you dont like the foot all the way down on accelerator idea you can pull the spark plugs and clean the gas off them and reinstall.

Its a common problem when you turn a car on and dont give it time to get to operating temperature before you shut it off.

 

 

That was funny... But I wouldn't be too harsh. Not everyone knows how car forums work. Still, I'm not sure how he got here to post this unrelated problem?


I tried the pedal to the floor trick and still nothing. Pulled the plugs and several are covered in oil again. So I'm guessing a valve cover gasket would be my next step?

 

No the valve cover thing has nothing to do with it not starting, thats just the crappie design...

If it smells gassy at the exhaust the car is probably really flooded with gas... (this is my guess anyways)

Sometimes you need to crank with foot to floor for a long time 15+ seconds... Sometimes you end up killing the battery it takes so long...

I usually hook up a jump box when im dealing with a flooded engine... Its not pleasant getting them started sometimes, and defiantly not a happy time for the starter.

Might wanna check you tube for some videos on it.

 

Trav, your memes are on point today

 

Every time you flick the key it primes. If you're smelling raw fuel at the exhaust it's flooded.

 

I checked the oil and it looks like milk. So obviously water got into the oil. Does that happen thru the piston rings?

So now what? Is the engine shot?

 

The engine may not be shot, but your budget will be. The only way to truly evaluate the damage done is to pull the engine and disassemble the top and bottom ends. If that much water has gotten into the internals, you may have damage to the bearings, or even bent a rod. Worse, leaving it alone isn't an option either, as the precisely machined surfaces of the VQ will degrade over time. Best to find a place you can begin disassembly and get to it before the engine is permanently lost.