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vincent_johnson5

Grandeur rough cold start

Having some trouble with my 2014 Hyundai Grandeur gasoline. It has 101583 km. Lately, it's been starting poorly and running rough during the cold start phase. Could a faulty cold start injector be the problem?

Summary of the thread

The 2014 Hyundai Grandeur is experiencing rough running during cold starts. The initial suspicion was a faulty cold start injector. After discussing potential causes, including the use of fuel injector cleaner and conducting an injector test, it was confirmed that the issue was indeed a defective cold start injector, which was subsequently repaired.

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4 comment(s)

haraldkaiser49

Hey, I had a similar issue with my Grandeur. Rough running on cold starts, you say? Have you tried any fuel injector cleaner or had the fuel system checked?

vincent_johnson5 (community.author)

I haven't tried injector cleaner yet. What kind of fuel system check are you referring to? Like an injector test, or something more comprehensive?

haraldkaiser49

Yeah, an injector test to see if they're spraying correctly. I ended up taking mine to a workshop, and it turned out to be a defective injection valve. Saved me a lot of headache trying to diagnose it myself.

vincent_johnson5 (community.author)

Thanks for the info. I'll take it to a shop and have them check the injectors. Turns out it was a faulty cold start injector, and the repair cost me 515€. Appreciate the help!

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HYUNDAI

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GRANDEUR