So I start the car up this morning, drive about a mile or two and am stopped at a red light. Out of nowhere, I feel my car vibrating and my exhaust tone is lower. I also hear my engine/exhaust, and it doesn't sound smooth - almost like its sputtering. I can also smell some weird smell, almost like something random burning. Upon acceleration, I feel the engine vibrating a bit and the car is definitely feeling weaker. So I drove the car carefully back home, went to Walmart in my friend's car and got a OBDII code reader. These are the codes I got.

P1399 Random/Multiple Cylinder Misfire
P0219 Engine Overspeed Condition

I was expecting the misfire but not the overspeed. I do have a 6 speed, but I have never over rev'd the engine. To my recollection, I have never hit the rev limiter. I also changed my spark plugs about 10-15k miles ago with the NGK iridium. I also put in 93 octane gas from Exxon yesterday. I now have 102K on the car. I have not yet gotten the valves adjusted or done the timing belt.

What could be causing this? I'm really hoping it's not the valves or anything. I was thinking it could be the coilpacks, but the engine overspeed condition is worrying me.

Thanks in advance

 

engine over speed could have happened any time, before u owned the car. it doenst throw up a code, but it does store it.

when the cars running and misfiring. start unplugging one coil at a time till the engine runs worse. if the sound doenst change, that coil is bad. if the engine runs worse than that coil is good.

 

About the first part, I understand that, but I never had a check engine light before that. And I also took it to an Acura dealership for a PPI before I bought it, and they never mentioned it to me. It came to me as a surprise because the check engine light came on after this happened today, and I find this overspeed when I check the codes.

And for the second part, I kind of feel uncomfortable running the car because it sounds like something is wrong. I'm not sure if I want it to run even worse and break something else. I talked to my cousin, and he told me to check each spark plug/coil pack by disconnecting all but one of them, taking that spark plug/ coil assmebly out, grounding it, cranking the car and see if I see sparks. Which ever one doesn't spark has the problem.

Finally, I took a video on my shitty phone. You can kind of hear that it sounds like a diesel truck near the end of the video at the mufflers. I also noticed that I hear some high pitched whistle when I go back there. Odd....

http://s528.photobucket.com/albums/d...=VIDEO0028.flv

 

just unplug one coil at a time. if it runs worse than before, plug the coil back it and move on until they sound of the engine doesnt change. thats ur bad coil. a misfire is usually a bad coil. it will throw many diff codes when just one is bad

 

It was certainly misshifted. Only way to get the overspeed code. And that code does not throw a light, just a stored code. Could have happened at any time. Just because the dealer said they checked it doesn't mean anything. There was no check engine light to check. Why would they hook a scanner to it?

 

does an overspeed mean valve damage? like will an overspeed cause valve damage for sure?

 

It doesn't always mean valve damage. U could have over reved it a few hundred rpm or a few thousand rpm like me and bent valves and had piston damage. All repends how much u over reved it

 

For the "over speed", does the same apply to auto's ?

 

nah. its impossible to overspeed in an auto. the manuals its possible because of the mechanical overspeed.

so rajca. how do u know u have piston damage?

 

jay. are you in alanta now or in houston? i could check it out for u

 

I'm in Houston now, unfortunately. I'm gonna try to do what Rajca suggested after work. Hopefully it's just a coil pack. I'm tired of car pooling already lol

Oh, and also how would you know if the valves were damaged? My car has been reliable until this incident.

 

I took off the heads bc I was gonna swap in some good ones bc mine had bent valves. And all my pistons were dented in on the intake side from over reving/ bent valves. I put on the good heads and haven't had a problem. Engines gettin rebuilt during winter anyway so damaged pistons won't bother me

 

Okay, I think its the coil pack on cylinder #2 from the test. I switched it with the coil from cylinder #6, and the engine ran the same when I pulled the #6 plug.

Going to Autozone to try to grab one before they close.... It doesn't have to be OEM right?

 

That fixed it. Thanks guys

 

ur welcome. it doesnt have to be oem but u can find the cheap on ebay if u can wait

 

You can overrev an auto though. These automatics particularly, sometimes when they go out they will downshift on you. If youre driving in, say 4th or 5th and it drops to second you could overrev.

 

true. but i was speaking about normal conditions.

 

civicdrivr, u cant over rev an auto. had that happen to me twice. doing 80mph on the highway then trans takes a shit, car drops into 2nd gear, hits the rev limiter and front wheels lock up till the mph match the rpms in 2nd. happened twice to me and never want to experience that again.

 

The rev limiter just cuts fuel, if the car drops into a lower (shorter) gear, and the gear stays engaged, the crank is going to spin at that, unless the torque converter slips. Theres nothing stopping the crank from spinning way past the fuel cut, especially when its driven my inertia.

 

You guys think it could have been a sensor going haywire that could have caused the engine overspeed code?

 

nah.