When cold, the engine almost stalls. When hot, on acceleration there's a slight delay

bluest · **May 13, 2025, 06:13:37**

I run a 2012 Hyundai i30 2.0l petrol vehicle in Australia. There is 140,000 kilometres on the clock & I've driven everyone of them from new.

The vehicle runs ok but I'm experienced enough to know it's not ok. When cold, the engine almost stalls. When hot, on acceleration there's a slight delay

The engine light came on and after troubleshooting and checking the fuel cap, I replaced pre and post o2 sensors with brand new Bosch products. Engine light remained on.

I purchased an OBDII reader (ToolPro) and followed the instructions for checking codes. The reader said there were no error codes, but I went through the "Erase Codes" anyway.

Started the car and engine light was off.

Went for a drive and light came back on. Troubleshooted with reader again. No codes displayed.

Appreciate any advice

Pnut · **Reply #1: May 14, 2025, 04:51:31**

If the light is on the car is saying there is something wrong, you might need a different code reader

bluest · **Reply #2: May 15, 2025, 01:43:27**

Thanks

rod_b · **Reply #3: May 18, 2025, 12:02:00**

I am a handy hoe mechanic with all the tools required. I'll preface the following by saying, never guess. Diagnosing is a process of elimination. It could be a hundred things causing the issue.
However, one of the first things I would eliminate is a dirty MAF sensor. The following video is for a Toyota, but the mechanic explains it so well it could be used for most cars.

- YouTube

When cold, the engine almost stalls. When hot, on acceleration there's a slight delay

bluest

When cold, the engine almost stalls. When hot, on acceleration there's a slight delay

Pnut

RE: When cold, the engine almost stalls. When hot, on acceleration there's a slight delay

bluest

RE: When cold, the engine almost stalls. When hot, on acceleration there's a slight delay

rod_b

Re: When cold, the engine almost stalls. When hot, on acceleration there's a slight delay