Comments on: Gasoline Direct Injection Engines Explained

By: Bill Kahle

Bill Kahle — Fri, 10 Dec 2021 18:36:10 +0000

Very interesting article. I’m old enough to remember cars with carburetors, points, distributors,
adjustable valves and using timing lights and feeler gauges. They don’t make them the way they used to, and it’s a good thing.
I read somewhere that engines with direct injection don’t start as fast as port injected engines.
This is due because the engine needs a revolution or two for the mechanical high pressure pump to build up pressure. I don’t know if they have accumulators? My C7 Corvette isn’t an instant starter.
I’m not a fan of electric cars, but its the future..

By: Wolfgang Herrfeld

Wolfgang Herrfeld — Mon, 20 Sep 2021 10:05:08 +0000

thanks for the article, which is done in understandable words; looking for your notes about electric-cars. useful your remarks about lpg.
greetings

By: David M.

David M. — Thu, 29 Jul 2021 14:08:33 +0000

A superb and lucid article covering a complex subject. My wife owns a 2016 Honda FIT with the Earthdreams (TM) engine. This car has a GDI fuel injection system. At around 30,000, she had to have the valves cleaned of carbon buildup.
The ‘Check engine’ light and detectable misfires while driving were the clues. I believe that the walnut method was used to clean the valves.

Your article really clears up the mystery of why this young car had to have a major shop visit.

She is not a high-intensity driver; too many short trips at low speeds (<45mph) may have been a major contributor. The FIT did not see much high-speed/multi-hour driving at interstate speeds.

I have a 2011 CR-V, with around 120,000. NO such problems. According to the folks at CRC, this model year has a PFI injection system, which is the way to go to keep valves clean. The CR-V also does the majority of high-speed/multi-hour driving.

You have cleared up the Tale of Two Hondas mystery.

Regards,