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Engine runs after shutting down?

 
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Old 04-06-2015, 08:59 AM
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Icon5 Engine runs after shutting down?

Hello

I own a 91 prelude 2.0ex ( carburator).

Now when i turn the engine off, it keeps running a few seconds on a strange way, hard to explain. I don't think this is good for the engine.

Does anybody know what the problem is?

excuse me for my english

greetz Stijn
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Old 04-06-2015, 11:01 AM
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Re: Engine runs after shutting down?

It sounds like you're describing dieseling. There are a number of things which can cause an engine to diesel.

First, run a carbon-cleaning solvent through your engine. A gasoline engine can't diesel without something to ignite the fuel. Diesel engines run without an ignition source because their extremely high compression ratios ignite the fuel by heat and pressure alone; gasoline engines use far lower compression ratios, so there must be something in the cylinder that remains hot enough to ignite the fuel. That "something" is usually excess carbon. Introducing a carbon-cleaning solvent like Seafoam, GM Top-End Cleaner or Wynn's Internal Engine Cleaner into your intake will dissolve the carbon and reduce hot-spots in the combustion chamber. Check youtube for videos on "Seafoaming" your engine. You may or may not have these products available where you are. I'm sure you will have comparable products there though.

Replace the spark plugs with "colder" heat range plugs. Odds are good that if your engine has been dieseling, the spark plugs are malfunctioning, coated in carbon and need to be changed. "Colder" plugs have a smaller ceramic insulator that will help to keep the plug tip cooler, eliminating a potential hot spot in the combustion chamber.
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Old 04-06-2015, 01:04 PM
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Re: Engine runs after shutting down?

Hey thank you for your quick respond !

I did a bit research and it's dieseling for sure.
It is a B20A3, so its a carbie... Should i clean the carburetor to?

I have to admit that i have no experience working on cars, but i'm doing my best to learn. but my buddy is a mechanic and he will help me.

Does it hurt my engine if i drive it in this conditions?

Thnx for the help!
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Old 04-06-2015, 01:14 PM
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Re: Engine runs after shutting down?

It can hurt it if you continue to use the car, but it can also be relatively harmless. It's difficult to predict if it will damage your engine. So you'll want to fix this condition as soon as possible.

Cleaning the carbs will not likely fix your dieseling issue, but it won't hurt them to be cleaned. However, be aware that the dual side-draft carbs on your engine are quite complex. What method are you planning to use to clean them? I wouldn't try removing them and disassembling them until you do a lot of research about them. They are not like normal car carbs, and it's very easy to mess them up. Most shops in my area refuse to even work on them because of the complexity. There is a member over on preludepower.com who is quite familiar with them. His username is TripleLude. He has a link to a thread on carb adjustments that can be made to the carbie lude in his sig at the bottom of all of his posts.

Edit: Here is a link to that thread in case you're interested...http://www.preludepower.com/forums/s...d.php?t=264926 I strongly suggest you at least read through this entire thread before you touch the carbs on your car. It can save you a tremendous amount of frustration and money if it keeps you from messing with the wrong adjustment.
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Old 04-06-2015, 04:07 PM
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Re: Engine runs after shutting down?

Ok I replace the spark plugs, and carbon clean the engine. hope that it will fix it.

I will read that tread, but if you say it's so complex i probably will not touch them

Thanks for your help!
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Old 04-06-2015, 04:19 PM
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Re: Engine runs after shutting down?

Sounds good, I hope that fixes your problem. I wasn't trying to scare you away from learning about your car, but I wanted you to be aware that the PGM-CARB system on your car is a complex system, and can be easily messed up if you adjust the wrong thing. I learned this the hard way on my 89 S model, which was my first 3rd gen. It was and expensive mistake.
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Old 04-06-2015, 08:03 PM
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Re: Engine runs after shutting down?

^^ good explanation about diesel-ing!!!

I knew in the old days junky gas would cause diesel-ing. But never considered it was from the carbon build up sorta being on fire, or rather hotter than the flash point of gasoline.

What do you think of ole Stijn running premium fuel?

If you can't find a carby mechanic for your car Stijn, maybe an old motorcycle mechanic can help. Honda sold a WHOLE LOTTA motorcycles back then.
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Old 04-06-2015, 11:36 PM
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Re: Engine runs after shutting down?

I'm not sure if premium fuel would solve his problem or not (I don't think it would but it might be worth trying just for a test). Even if it stops his dieseling issue, it won't fix the problem, it will merely be a band-aid fix for it. Until he fixes the cause of the problem he'll have to pay for premium gas if it does do any thing to help his issue.

As I mentioned in my earlier post, there can be many cause of dieseling. Here's a link to a pretty good explanation of dieseling, and the many causes of it. It goes into detail and it's pretty interesting IMHO...
Engine run-on, Dieseling
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Old 04-07-2015, 07:28 AM
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Re: Engine runs after shutting down?

I maybe try the premium fuel, if i can't get seafoam or simular product's and spark plugs soon.

Do you have experience with seafoam? I read some horror stories about it, damaging your engine.

About the carbs, i'm reading and learning about them, but you're right that it's to complex for me at the moment.

Last question, I think I have the B20A4 instead of the A3 because the A4 is the europian version of the carbed engine. Do you know what the difference is between those 2 types?

Thank you for helping me out!

edit: found an DIY for people who are intrested : ENG: DIY Sea Foam - Motor Treatment

Last edited by Stijnsuy; 04-07-2015 at 10:22 AM.
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Old 04-07-2015, 10:30 AM
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Re: Engine runs after shutting down?

I've used seafoam on many different vehicles, both carb'd and fuel injected. I've never had any problems with it, and in general I've seen throttle response and fuel economy improve after use. Don't be alarmed by the amount of smoke coming out of the tailpipe during the treatment. This is normal, and will dissipate after a bit of driving. I do not pour any of the seafoam into my crankcase as suggested in the directions on the can though. I don't believe in adding anything to my crankcase except motor oil. I always change the oil and filter within a couple days of the seafoam treatment as well.

The b20a4 is rated at 10 hp higher than the b20a3, and something like 5 lb/ft more torque. I've read that it has no catalytic converter or EGR valve, which may explain the higher ratings. Since it's a European engine and I have never even seen one, all I can do is go off what I've read, and everything I've read suggests that the mechanicals are pretty much the same between the two engines. One source (wikipedia) suggests that the b20a4 isn't controlled by an ecu, but I find that difficult to believe. Since pretty much anyone can go in and edit a wiki like that, I'm inclined to believe that was a typo, and they meant to type egr instead of ecu.
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Old 04-07-2015, 03:46 PM
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Re: Engine runs after shutting down?

Did some research and i do not think seafoam is available in belgium, but still searching.
I just got back from my mechanic/mate, and he gave me petrol injector cleaner from the brand nullon. Hope this will do the job!

He ordered new sparkplugs and also suggested to use octane 98 istead of 95.
I will keep you informed!

Ok now i understand the difference, thank you for explaining it.

greetz Stijn
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Old 04-07-2015, 03:51 PM
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Re: Engine runs after shutting down?

The injector cleaner might help. But make sure you change the fuel filter after running that tank of fuel through. Fuel injector cleaner cleans the entire fuel system, from the tank forward. And all of that crud will usually clog the fuel filter. This is less important if you use injector cleaner regularly. If you continue to run with a clogged fuel filter, the fuel pump has to work a lot harder to maintain fuel pressure, and it can cause the fuel pump to fail prematurely. Just something to keep in mind.
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Old 04-07-2015, 04:02 PM
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Re: Engine runs after shutting down?

Ok i will change the fuel filter afterwards, at the same time with the oil.

Will keep you updated about the dieseling
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Old 04-07-2015, 05:27 PM
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Re: Engine runs after shutting down?

Do you have 'BG' products available there?

Here in the States that's the brand of fuel system cleaner Honda reccomends. Honda makes a whole lot of their own special products. So when they reccomend a certain brand that is not a Honda brand, it's likely good stuff.
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Originally Posted by ogsmakdade View Post
welcome to site Carl
...is a golden car fax kinda like a golden ticket? Sure hope willy wonka didn't put any snozberries in your motor.
Quote:
Originally Posted by elspectro29 View Post
Only seen the first one, 15 years ago in theaters. Plan on keeping it that way. Get off my lawn.
Quote:
Originally Posted by Lindso View Post
I remember my first thread, asking what a noise was when I got going 110mph.
Pretty much got flamed for driving like a jackass and was told to slow down. And I'll be damned, slowing down fixed it.

God's Not Dead

Last edited by bykfixer; 04-07-2015 at 05:29 PM.
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Old 04-07-2015, 08:33 PM
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Re: Engine runs after shutting down?

BG 44k is what many dealer service departments use. My local Chevy dealer uses it.
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Old 04-21-2015, 07:36 AM
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Re: Engine runs after shutting down?

I used the injector cleaner and octane 98. and the problem is fixed !

I replaced the spark plugs an fuel filter afterwards like you mentioned, and also replaced the oil and oil filter.

Thank you for your help guy's !
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