[DML] Re: Emissions

["David Teitelbaum" <jtrealty@xxxxxxxxxxxxx>]

Generally if you fail an emmisions test the thing to do is just do a
regular tune-up. Of course this varies from car-to-car. On a Delorean
I would recomend replacing the following:
Spark Plugs
Ignition wires
Distributer Cap and rotor
Air filter
Fuel filter
O2 sensor

Also you should include cleaning and testing the fuel injectors and
finding and fixing any vacuum leaks. Depending on the mileage possibly
checking and adjusting the valves. You really don't have to mess with
the mixture adjustment (it could need a minor tweak) but if you passed
before then replacing these parts should get you to pass again. Use
fresh fuel when going for the test and make sure the car is completely
warmed up.
In doing the tune-up you will most likely replace the worn/defective part.
David Teitelbaum
vin 10757



--- In dmcnews@xxxxxxxxxxxxxxx, "M. P. Olans" <mpolans@xxxx> wrote:
>
> One easy swap-out is the O2 sensor,
>      That tends to do the trick.  However, I had two bag plug wires 
> that caused a very rich reading during emissions.  The way we ended 
> up findind it was with a timing light.  It just so happened that 
> plug wire #1 was firing intermittantly.  We thought at first it was 
> the timing gun but other guns had the same "malfunction."  Upon 
> testing the other plug wires, #5 also suffered the same problem.  I 
> only had about 10,000 miles on the car since the last tuneup but I 
> figured if I was going in I might as well do plugs, cap, and rotor.  
> That was the trick.  Everything came down to within acceptable 
> levels.
> 
> Good luck, and let us know the outcome.
> 
> Matt Olans
> VIN 16816
> www.az-d.org  The Arizona DeLorean Club
> 
> 
> --- In dmcnews@xxxxxxxxxxxxxxx, "vin4258" <vin4258@xxxx> wrote:
> >
> > Wonderful news in that vin 4258 failed its emissions idle test.  
> > Readings at 686 RPM were 289 for HC and 4.25 for CO% when 220 and 
> 1.2 
> > are legal limits respectively.  I have read through my tech 
> service 
> > manual and it says that I don't want to adjust the idle mixture 
> screws 
> > since they are factory set and don't need subsequent adjustment.  
> So, 
> > where should I start- is this easy as an air filter change (it 
> > probably needs one) or is it the cold start valve or thermotime 
> > switch, or a new direction completely.  BTW the same readings were 
> 72 
> > HC and .8 CO% at the high speed test (2378 RPM) which passed.
> > 
> > Any thoughts?
> >
>








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