jannikschmidt21
LFA cold start injector issue
Summary of the thread
A 2011 Lexus LFA with 95,046 km is experiencing poor engine performance during cold starts, suspected to be due to a faulty cold start injector. The issue likely involves fuel delivery problems, and potential causes include injector malfunction or ignition system misfires. Diagnostic steps suggested include testing the injectors for performance metrics like spray pattern and flow rate, rather than starting with cleaning. Ultimately, the problem was confirmed to be a defective injection valve/injector, which was repaired.
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4 comment(s)
jannikschmidt21 (community.author)
Thank you for your reply. Could you elaborate on the process of testing the injectors? Is it feasible to perform injector cleaning as an initial step, or would a full injector test be more appropriate at this stage?
liam_star3
Regarding injector testing versus cleaning, I'd lean toward a comprehensive test first. This will give you a clear picture of each injector's performance – spray pattern, flow rate, and leakage. Cleaning might improve things, but it's a bit like a shot in the dark without knowing the extent of the problem. Given the LFA's age and mileage, and the symptoms, it might be best to bring it to a trusted workshop.
jannikschmidt21 (community.author)
Understood. I appreciate your input. The issue was indeed a defective injection valve/injector. The repair cost came to 515€. Thank you again for your assistance.
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LEXUS
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LFA
liam_star3
Hard starting on an LFA definitely points to fuel delivery issues during cold starts. Have you considered an injector test, or checking fuel rail pressure? A misfire could also contribute, so perhaps check the ignition system as well. It's difficult to pinpoint without further diagnostics, but start with the basics.