Peak PerformanceMobile Mechanics
0475 358 017Get a quote

VF Calais V8 misfire traced to injector #6

Holden VF Commodore Calais V8. Diagnosed and repaired on site in Perth.

Engine bay of a red Holden VF Commodore Calais V8 with the bonnet open

The file

Reported
Running rough, with a noticeable misfire and a rough idle.
Tested
Full diagnostic assessment, then testing of the injectors.
Found
Injector #6 had no electrical resistance, which points to an internal injector fault.
Done
  • Genuine Bosch injectors sourced
  • Injectors fitted and tested
  • Engine operation verified after the repair
Result
Returned the following day and handed the car back running smoothly.

What happened

This Calais came to us running rough. The misfire was obvious and the idle was uneven, so we started with a full diagnostic assessment rather than guessing at parts.

Testing the injectors one at a time found the cause. Injector number 6 showed no electrical resistance. That is an internal fault in the injector, not something a spark plug or a code clear would have fixed.

We sourced a set of genuine Bosch injectors and came back the next day to fit them. Once they were in, we tested again and verified the engine was running properly before handing the car back.

123456Fault78
Injector #6 had no electrical resistance, an internal fault. A full set of genuine Bosch injectors went in.
As reported Injector pulses: #6 not responding
After the fix Injector pulses: all eight firing
  1. Day oneDiagnostic assessment and injector testing. Fault found at injector #6.
  2. Day twoGenuine Bosch injectors fitted, tested and the engine verified.
  • Eight removed fuel injectors laid out on a dark cloth
    The removed injectors.
  • Boxes of new Bosch injectors stacked in an engine bay tray
    The replacement Bosch set.
  • The red Calais in a garage, shown with the bonnet open and closed
    Before and after, in the customer's garage.

Something similar going on with yours?

Send the vehicle details and what it is doing. We come to you, find the cause and keep you informed.

Get a quoteCall 0475 358 017

More job files