Re: [DML] Re: Failed emmissions AGAIN
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Re: [DML] Re: Failed emmissions AGAIN

Hello Nathan

One of the reasons for your failed emissions might be the prolonged use of 
premium fuel. I am assuming that you mean 93 octane. Higher octane gas 
causes deposits to form inside the cylinders and in the exhaust system. That 
in turn will over time cause the compression to be raised. With that you 
will get higher temperatures in the center of the cylinders along with 
unburned gasoline close to the edges of the cylinders. The DeLorean engine 
was designed to use 87 octane gasoline and this is what you should use. 
Using 93 will just cost you much more and will not do any good for the car.
Before you go to test the emissions again make sure to burn all of the 93 
you have in the tank and then fill it up with 87. Then go for an hour long 
drive at highway speeds. This should clean up a lot of the deposits left 
from using 93 octane fuel. From there go directly to the testing station. 
Try not to get stuck in traffic as idling for prolonged period of time will 
again cause deposits to start forming.
I posted about the use of 93 gas in the past, but I guess it's a good idea 
to mention that again for new members on the list.
BTW, 87 octane in USA is the same as 91 in Europe.

Good luck

Tom Niemczewski
vin 6149 (in Poland!)

----- Original Message ----- 
From: "valleyrat12" <valleyrat12@xxxxxxxxx>
To: <dmcnews@xxxxxxxxxxxxxxx>
Sent: Friday, December 16, 2005 5:11 AM
Subject: [DML] Re: Failed emmissions AGAIN

>I have recently purchased the car in Colorado and drove it back to
> California. The PO said that he put nothing but premium in the tank
> and I have followed suite. The fuel in the tank is only a week old.
> I do not know when the last tune up was done, I am doing one myself
> along with replacing the O2 sensor, changing the oil and installing
> a new cat. There is a tick coming from the right hand valve train
> (confirmed by Delorean Motor Company in Garden Grove) so I will also
> be re-gapping the valves. I also had Don check and adjust the
> mixture but I gather that if my O2 sensor is bad that will not mean
> much.  Out side of the work I am doing on the car (previously
> mentioned) I do not know what else could be the problem. Also I am
> not aware of any major work that was done to the engine in the
> recent past aside from a fuel system work over done by the PO. (It
> had sat for a while before he bought it) The tank was cleaned and a
> new fuel pump was installed.
> BTW I got 26 miles to the gallon on the drive home, sounds like a
> healthy engine to me. Or could it indicate a lean condition? I
> figured Delorean Motor Company would have caught that. If it fails
> again I will be at aloss. (and in trouble with my wife....) :(
> Nathan

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