USCAR to OBD1/EV1 adaptor | 90.1

The housing of the USCAR to OBD1/EV1 adaptor (90.1) is typically constructed from high-quality, glass-filled PA66 nylon or a similar engineering-grade thermoplastic. This material is chosen specifically for its resistance to fuel vapor, oil, and extreme under-hood temperatures, guaranteeing long-term electrical reliability in performance applications.

The adaptor achieves secure electrical retention using internal locking tabs and a precisely molded fit that mimics the positive locking mechanism of the OEM connectors. Once plugged into the OBD1/EV1 harness and the USCAR injector, a tactile 'click' confirms the connection is secure, preventing vibrational loosening in high-vibration engine environments.

These adaptors feature an excellent level of ingress protection (IP rating), often comparable to OEM connectors. They use internal silicone seals around the terminals to protect the electrical contacts from water spray, moisture, and dust, making them completely safe and reliable for use in exposed engine bay locations.

Common symptoms of a poorly seated or failing injector adaptor connection include engine misfires, rough idling, intermittent power loss under load, or an Engine Check Light (CEL) related to fuel trim issues. These symptoms occur because an intermittent connection disrupts the precise injector pulse signal from the ECU.

Yes, the USCAR connector is polarized and features a distinct mechanical keying system. It will only physically plug onto the new injector in one correct orientation. This prevents miswiring and ensures that the 12V power pin and the ECU ground signal pin are always connected properly.