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Did I hydrolock my engine using Seafoam?

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26K views 48 replies 14 participants last post by  OneSpecialM  
#1 ·
Well, I'm scared shitless. I was flipping trough the Seafoam thread and decided to try it.

Well, I can feel noticable vibrations when I'm sitting in park with the car on idle. However, when I rev the engine at or above 2000RPM, the vibrating goes away.

Another thing that was happening, the check engine light went on, and would flash when I was revving the engine at 2k-3kRPM's. Once I let go of the gas pedal and the car went back to idling, the check engine light turns solid and stays there. I don't know what the error message could be, I'll have to check in two days (won'tbe in town tomorrow). The exhaust sounds different as well, you can hear it making a puffing sound.

When I was driving the car, I could notice the speedometer gauge acting a bit odd. Say I went up to 55mph, it'd shake around the 54-55-56 mark.

Well, I put it in trough the suction hose trough here (this is a pic from the seafoam thread):

Image


Anyway... this is what I did:

- Let the engine run for about 5 minutes
- Slowly (maybe not slow enough) sucked in the Seafoam (half a can). My definition of slowly and how fast I sucked it in is: about half the can within 5 minutes. I'd stick the vacuum hose into the seafoam for about 1-2 seconds, release, then stick it in again every 10 seconds.
- Let the engine idle for about 5 minutes.
- Took the car for a drive, took it up to 70mph, and drove it around town for a bit.

So, the car is off, I let it idle another 10 minutes before I went outside to turn it off. Now I'm here, scared shitless, hoping I didn't **** up my Intrepid. I feel like a complete idiot, and even worse knowing I could lose it.

I'm going to try starting the car again in a few minutes, seeing if letting it settle did anything.

:bowdown:
 
#3 ·
well you put the seafoam in slower then i did and mine is fine so i dont think thats the problem.
 
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#4 ·
Did you guys feel any vibrations or anything I have experienced above? Different muffler sounds?

Gonna go and start the 'trep, see if letting it sit did anything.

I don't have the check engine light tool, maybe I'll see if I can get the 'trep to autzone and have them check what its saying before I leave around 8:30AM... hope they're open that early.
 
#5 ·
Well, went and started the car... still shakes, check engine light's still on. What I find odd is the engine sounds the same as it always has.

I'm wondering whether I should go and let the car idle for longer?

I dunno if I'll be able to fall asleep with this on my mind, argh!
 
#6 ·
where do you live?
 
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#8 ·
how much have you driven you car since seafoaming it?
 
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#10 ·
00r/t.mopar.muscle said:
Did you do the key dance? I don't know if that works on 1st gens or not if that's what yours is.
yeah it works on 1st gens.
 
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#13 ·
I'll be happy if I didn't ruin my engine, that's all I need to hear from somebody. If it fouled my plugs and messed up my o2 sensor, I'd take that anyday over hydrolocking my car.

I've looking trying to find out exactly what hydrolock is, but I haven't gotten a definite answer. On one thread somebody said you would definitely notice when you hydrlocked your car.

Do any of you have an idea as to what I'm describing above sounds like a hydrolock or just another problem that can be fixed? Is my car hydrolocked? I'm sick of that word, I swear, lol.

EDIT: I should have thoroughly read as to how to inject it before I did it, but anyway, I let it slurp, however, I did submerge it a couple of times as well.
 
#14 ·
First I don’t think you hydro-locked it, because due to the velocity of the intake air, I think it’s nearly impossible to hydro-lock it with one cup of seafoam being sucked through that little hose. I think one of two things happened. First I think you may have just screwed with the sensors a little, and it will clear up after a little driving, or possibly by resetting your codes or disconnecting the power for about 20 minutes (that’s just a stab in the dark though). The other is that if the exhaust note changed, and has stayed different and the performance is odd, wheezy, and has now top end power; that sounds like classic signs of a clogged catalectic converter.
 
#16 ·
flying_pork_products said:
I've looking trying to find out exactly what hydrolock is, but I haven't gotten a definite answer. On one thread somebody said you would definitely notice when you hydrlocked your car.
In automotive terminology, a hydrolock is the immobilization of an engine's pistons by a liquid (usually water, hence the prefix "hydro-"). Hydrolocking occurs when liquid fills a cylinder on the intake stroke and, due to the incompressibility of a liquid, makes the compression stroke impossible. This, in turn, prevents the entire engine from turning, and can cause significant engine damage if one attempts to forcibly turn over or start the engine. Typically, connecting rods will be bent, making the engine uneconomical to repair. It is relatively common when driving through floods, either where the water is above the level of the air intake or the vehicle's speed is excessive, creating a tall bow wave.
(Thank you answers.com)

I think there would be a lot of metallic sounding racket under the hood if you had hydro-locked it and bent/broke something.
 
#17 · (Edited)
Sleeper, if you are right, I want to thank you, because just knowing my engine isn't gone completely makes me feel 10x better.

It has top end power, the only time the car vibrates is from idle up to the 1800RPM range. I'd notice when driving when I let go of the gas pedal and started accelerating again, I'd feel a vibration until I reached 2000RPM. However, what's odd at higher speeds is the speedometer in shaking 1-2 mph increments.

As to the exhaust sound, maybe I'm just dumb, because I never truly listened to my exhaust until now. Maybe it has always sounded this way.
 
#19 ·
If the “key dance” doesn’t give you what you’re looking for, if I were you I’d just go to Advance, Checker, or Napa and have them run the codes on the car. If it’s flashing the check engine light there’s probably a sensor that isn’t working right at all. Also check and see what your exhaust smells like after it’s reached operating temp. If it smells kid of sweet it’s probably getting the air fuel mixture right; if it smells gassy it’s probably an oxygen sensor or a clogged spark plug; and if it smells like rotten egg it’s probably a clogged catalectic converter.
(Oh and don’t leave your head in front of the exhaust pipe for too long, it’s not healthy.)
 
#20 ·
Well, I'm going to head to bed, have to wake up in around four hours.

I'm extremely relieved that the worst that could have occured, didn't. Thank you both for putting my minds at ease.

I'll drive the car around for a bit tomorrow when I get back home and see if I can make it to Autozone before it closes to see what the check engine light says.

Thanks everybody for all your help, and anyone else that skims trough this thread and has any input or ideas as to what could be happening, I'd love some more input. Thank you.
 
#22 ·
24vsleeper said:
If the “key dance” doesn’t give you what you’re looking for, if I were you I’d just go to Advance, Checker, or Napa and have them run the codes on the car. If it’s flashing the check engine light there’s probably a sensor that isn’t working right at all. Also check and see what your exhaust smells like after it’s reached operating temp. If it smells kid of sweet it’s probably getting the air fuel mixture right; if it smells gassy it’s probably an oxygen sensor or a clogged spark plug; and if it smells like rotten egg it’s probably a clogged catalectic converter.
(Oh and don’t leave your head in front of the exhaust pipe for too long, it’s not healthy.)
I'm going to go try the key dance right now real quick before I head to sleep. If it works, I'll come back with the code. I'll smell the exhaust, might as well while I'm there. And I'll take your advice Seth, LOL!
 
#24 ·
There ahs to be another code after that. The 1684 is just the battery has been disconnected in the last 50 starts. That won't trigger the light, it jsut gets stored. There's another code related to your problem. It will flash them one after another, and say "done" when there are no more to display.
 
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