Injectors are leaking too much fuel back to the tank, it's an extremely common issue on K9K engines usings Delphi and Siemens/Continental fuel injectors.
Pros: common issue on K9K engines
Cons: injectors are expensive
Reviews of DELPHI fuel injector
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6 votes
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2 reviews
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What I have done since is change to delphi 415cc injectors which now idle fine and exhibit much better throttle response and run a haltuner O2 sensor to fine tune the mixture since the injector change. I am fairly confident the mixture is OK, I have used this haltuner on my supercharged 8v with good results and my spark plugs, if anything, look like they are on the rich side, a bit carboned up but not overly.
Pros: better throttle response, idle fine
Cons: spark plugs rich side
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What we know about DELPHI fuel injector
The brand is registered in USA. Official website: https://www.delphi.com/.
In March 2026, PartReview does not yet have a formed opinion of DELPHI fuel injector. You can help by adding a review for DELPHI fuel injector.
Currently there are 2 reviews and 6 votes. Average rating — 4 out of 5. Vote balance: 6 up, 0 down.
Users also evaluated the qualities of DELPHI fuel injector:
- Idle - engine idles rough or shakes, making the car feel unhealthy - rated positively. 5 points out of 5.
- Acceleration - hesitation or misfire under load, reducing confidence - rated positively. 4.5 points out of 5.
- Smell - fuel smell near the car, a sign of leakage and a fire risk - rated negatively. 1 point out of 5.
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