AMERICAN METAL GARAGE

TECHNICAL REFERENCE

Aston Martin V8 EFI Ignition

System background, component identification, and the details that matter when sourcing a replacement.

01 / BACKGROUND

THE ORIGINAL SYSTEM

Aston Martin adopted Weber–Marelli fuel injection in 1985. This guide focuses on the V8 EFI ignition components shown in the 1985–2000 parts reference. The system brings together the EFI ECU, distributors, magnetic pulse pickup, rotor arms, caps, coils, and ignition module.

02 / THE COMPONENT

THE PULSE PICKUP

The reference notes describe a two-wire, variable-reluctance magnetic pickup designed for the Magneti-Marelli distributor housing. Its key features include shielded cable, high-temperature windings, precise pole-piece alignment, and an adjustable air gap.

These EFI Ignition components are exclusive to Aston Martin ONLY!

INSIDE THE ASSEMBLY

Realistic silver rendering of the Aston Martin V8 EFI pulse pickup assembly with labeled components and wiring.

Original Aston Martin part numbers by year
Description	Aston No.
Cap -Dist RH 1986-1989	#07.25569
1-4-6-7 1990-2000	#07.26778
(interchanges with above)
Cap -Dist LH 1986-1989	#07.25568
5-2-3-8 1990-2000	#07.26779
(interchanges with above)
Coil with module 1986-1989	#07.20015
1990-2000	#07.26474
(interchanges with above)

Ignition components, wires, and accessories
Description	Aston No.
Pulse Pickup	#07.25570
Rotor arm (AMA Red)	#07.25576
Module for Coil Located on the base of the coil; the part most likely to fail. Service replacement.	#New Part

03 / TROUBLESHOOTING CONTEXT

AGE-RELATED FAULTS

Age and heat do affect the original pickup assembly. The following symptoms are reasons to investigate the ignition system; they do not, on their own, confirm a failed pickup.

Original pulse pickup showing worn insulation and exposed, frayed copper wiring on a white background.

SYMPTOMS TO INVESTIGATE

Does Not Start Loss Of Spark Intermittent Misfire Unstable Tachometer Faults When Hot Or Cold

POSSIBLE DETERIORATION

Heat Cycling Brittle Installation Covering Fractured Internal Wire Missing Degraded Epoxy Potting Water Condensation Contamination

04 / ORIGINAL REFERENCES

PART IDENTIFICATION

Original numbers. RH Right Hand, LH Left Hand as seated in the vehicle.

Aston Martin V8 EFI reference part numbers by year
Component	1986–1989	1990–2000
RH distributor cap · cylinders 1-4-6-7	07.25569and/or	07.26778
LH distributor cap · cylinders 5-2-3-8	07.25568and/or	07.26779
Pulse pickup	07.25570	07.25570
Rotor arm (AMA Red)	07.25576	07.25576

Later EFI Caps are interchangeable with earlier EFI Caps with the part number above for easier reference.

05 / PART MATCHING

BEFORE SELECTING A REPLACEMENT

It is highly likely that multiple components will be required.

Parts available individually or part as a complete set.

Refer back to Section 2

NEED HELP IDENTIFYING A PART?

Send your model, year, distributor number, and clear photographs to American Metal Garage.