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Hello all,
I own an '81 DeLorean which, in case you didn't know comes factory equipped
> with a PRV-6, Volvo varient with Bosch K-Jetronic fuel injection, (Lambda
> emissions equipped) and Bosch computer controlled ignition.
>
> I have a stubborn problem that I believe to be electrical vs. fuel. The car
> experiences mis-firing under load. When I pull away from a dead-stop, the
> car "stutters", it also does this upon hard acceleration, and the
> acceleration curve goes flat.
>
> I have checked all fuel system pressures with a Bosch K-jet fuel pressure
> test rig. I have changed the filter repeatedly. The -entire- fuel system has
> been replaced, including the metering head (fuel distributor). I've even
> pulled the new injectors and had them re-cleaned. The fuel tank was removed
> and cleaned before the car was ever even started.
>
> Electrically, I've repeatedly replaced the cap, rotor and wires. Here's the
> twist: The behavior changes when I try different types of coils or ballast
> resistors. I have replaced the ignition ECU module (Bosch again). This had
> no effect. If I use a Bosch 18Kv coil, the car idles well, but mis-fires
> under load -if- you push the pedal down too far. If I use the OEM Bosch 12Kv
> coil, the car stutters under load when pulling away, but smooths out once
> RPM's reach 2200 +. The timing advance has been checked and it works
> properly. The timing is set correctly, which is 13 +/- 2 degrees for a
> DeLorean. I've tried "power timing" with some success. The pulse coil inside
> of the distributor that sends signals to the ignition ECU measures the
> proper resistance according to the tech manual. Could it still be bad? I've
> also checked all grounding points.
>
> As you can see, I'm getting desperate since I'm stepping outside of DeLorean
> circles and looking to other areas for help. Your article was well written
> and I'm hoping that you've seen this behavior in other cars. Any insight you
> could provide would be appreciated. Please email me at racuti1@delorean.com
>
> Thanks,
>
> Rich A.
> Crofton, MD
> U.S.
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