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engine runs flat

 
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Old 10-08-2012, 10:53 AM
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engine runs flat

Hi,

i recently bought a honda prelude 2.2i vtec of the year 1997.

sometimes when driving the engine runs flat, there is no symbol on de dashboard when it happens, when i try to start the engine again, it isn't possible.
when i unlock and lock the doors again whith the remote control, there is not happening much, untill (for me ) whitout a trace, my alarm starts yelling, when i put this one off, i can swtart my engine again.

does anybody know what it can be and what to do about it.
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Old 10-08-2012, 02:49 PM
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Re: engine runs flat

Oh shiiiiiit. That sounds weird.

I don't know what you mean by "Engine runs flat" is it stalling?

If it's stalling and not starting again right away it could be overheating so check your temp gauge.

The thing with your locks and alarm could be bad wiring so check that if you can and make sure it's not wired to anything weird.
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Old 10-08-2012, 06:15 PM
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Re: engine runs flat

What i mean with run flat is that everything exept my
Windows and lights are stop functionion.

I cant start my car right away, maybe something with the immobilizer system?
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Old 10-08-2012, 06:40 PM
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Re: engine runs flat

Could be your battery.

How long have you had that car?
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Old 10-08-2012, 06:48 PM
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Re: engine runs flat

maybe ignition relay?
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SHdriver once told me that some preludes lose vtec after a while. I think you need to take it to Honda and RE-Vtec-a-lize it. Just my .02
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Old 10-08-2012, 06:56 PM
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Re: engine runs flat

Take a look at your battery and ignition lines.

Does the car do that when you're driving or only when you're going slow/standing still?
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Old 10-09-2012, 01:38 AM
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Re: engine runs flat

maybe try adjusting your idle speed, if its an electrical problem, it could be your ignition relay...

you know what it might be though, possibly a bad alternator, try this, next time you are going to start your car, jump start it to charge up your battery a little bit, and then unhook the jumper cables, and then unhook the ground from your battery, positive i believe then one that goes from battery to the radiator support right there. not the one that goes to fuse box, always get them mixed up lol, if your car noticeably drops idle, or shuts off right when you remove the ground terminal from the battery, then your alternator is bad

if its not that, it could be that your idle speed is to low maybe? is it weak when your trying to start it the first time of the day? cause it could possibly be your starter.

also if your alternator checks out good, then you could possibly need a new battery. if the alternator is bad, then its not doing its job properly by keeping the battery charged, which would cause you to loose power when the battery drains, and then not be able to start again because its drained to much. that would be my guess, try it and then let us know
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Old 10-09-2012, 03:11 AM
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Re: engine runs flat

I have This car for bout 3 months.
It happens when i'm drivng,but. It can happen even when i want to drive away, or slowing down.

I'm going to change the battery, see what thst does..
Thanks for so far..
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Old 10-09-2012, 03:16 AM
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Re: engine runs flat

dont just go changing parts and hope it fixes your problem man, you need to pinpoint the problem and fix that. you should get your battery tested first, for free at pepboys, or autozone, also, do the alternator test i told you about, or have pepboys or autozone do a free one for you...

also check your idle speed, you can change it yourself...

when you ask a question, you get advice... you should follow the advice from the people who give you logical answers, and possible solutions... not just im gonna go buy a battery and see what that does, you will waste money if your battery was not bad in the first place. but if thats what you wanna do, then do it. i gave you my advice, its up to you how you use it, and others advice too...
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Old 10-09-2012, 03:40 AM
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Re: engine runs flat

I understand, and i agree, but i'be a New battery in the garage. So its not that i have to but a new One. And i thought of there is something wrong with it, that should help the problem right?
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Old 10-09-2012, 11:31 AM
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Re: engine runs flat

Sure, swap your battery if you have a spare one, but you should find out exactly what the problem is because if your new battery can hold more charge and it could feel like the problem is fixed, but you're just delaying the inevitable and the issue will rise again later on.

If you're unsure of your mechanical skills or don't feel confident enough to test anything yourself then take it to a mechanic. I know that you're here because you'd rather fix it yourself, but sometimes it's better not to mess with your car if you don't know what you're doing.

I had some electrical problems and wanted to fix them myself, I ended up wrecking my sunroof and draining my battery for no reason, so think twice before you start digging around.
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Old 10-09-2012, 01:44 PM
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Re: engine runs flat

if you already have the battery then go ahead and swap it, but did you try the alternator test i recommended? its not that hard to do.... just get the car running, with a good battery (charged, jump started) if you jump start it let the jumper cables sit on your battery still connected to the doner battery (car) to let it charge up a little, and then disconnect jumper cables, disconnect ground terminal(cable) from the battery post, and see what happens and then let me know what happens... it is very possible that either the alternator or battery is going to be your problem in this case, however, a replaced battery will fix the problem for right now if it is one of those two. BUT you should test your alternator for this reason:

The Battery is what is needed for everything electrical on a car to work, with a drained battery only things that require low power will work, meaning windows, and lights, you will not produce enough power to start the car.
There are a few things that can cause a battery to not operate properly:
1. Dead or Drained battery - either need a new battery but should look into number 2
2. Bad Alternator- The alternator is driven by the engine, connected with a belt. once the battery starts the car, the alternator charges the battery, which is why the battery doesnt usually go dead or drained. so with a bad alternator you will have a drained battery. and replacing the battery without looking into the alternator, will potentially cause this problem again in the future, because your battery is getting no charge.

3. The only other thing to look into would be the wiring, make sure all wiring is tightly secured, especially the battery terminals, and make sure there are no cuts in your wiring, and if there are, not touching metal, this will short out your battery. if you have exposed wiring, and you cleaned your engine bay recently, with water cause that would NOT BE GOOD? if you have exposed wiring you should either wrap it with electrical tape after pushing frayed wires back in as best as you can, or REPLACE IT ASAP. I think all the stock wiring for the battery is 4awg, and lilmissprelude posted a very good DIY writeup for the Big 3, you should look it up. ALSO check your grounds, it could simply be a bad ground, not clean contact, metal to metal, loose connection any of these. all of these checks i gave to you will take you all of about 10 minutes to do, and are very simple.
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