After replacing the engine, it will not stay running?

JAY_13

MEMBER
2007 KIA SPORTAGE
2.0L
4 CYL
2WD
AUTOMATIC
200,000 MILES

I replaced the engine, but my car shuts off when I let off gas, I have to keep my foot on gas pedal the entire time or car cuts off. What causes that?

Saturday, June 22nd, 2024 AT 4:20 PM

5 Replies

KEN L

MASTER CERTIFIED MECHANIC
45,347 POSTS

This sounds like you have a vacuum leak or the idle speed actuator is not working or unplugged. Please go over this guide to help us fix the problem:

https://www.2carpros.com/articles/stall-at-idle

Here is the location of the idle speed actuator so you can check it out. Check out the images (below). Please upload pictures or videos in your response of any problems so we can see what to help you with.

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Sunday, June 23rd, 2024 AT 12:14 PM

JAY_13

MEMBER
4 POSTS

So, it cranks over but the engine shakes when trying to start it still won’t stay on.

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Tuesday, June 25th, 2024 AT 4:34 PM

KEN L

MASTER CERTIFIED MECHANIC
45,347 POSTS

Does it run are just crank over? And if it runs can you drive it with hooding your foot one the throttle sightly? Can you please upload a short video of what you are talking about so I can see whats going on?

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Wednesday, June 26th, 2024 AT 9:33 AM

JAY_13

MEMBER
4 POSTS

This is how it sounds trying to turn on the car the first 2 or 3 tries. Then the car will stay on but as soon as I step on the gas pedal the car shuts off. I have replaced the throttle body and crankshaft sensor.

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Tuesday, July 9th, 2024 AT 3:54 PM

KEN L

MASTER CERTIFIED MECHANIC
45,347 POSTS

Thanks for the video. The engine is hurt, either the timing belt has jumped or the engine has overheated. I would remove the spark plugs and do a compression tests which you can rent get the kit from the auto parts store for free in most cases.

Here is a guide to help you with the test.:

https://www.2carpros.com/articles/how-to-test-engine-compression

My bet is the timing belt because of the codes. Please go over this guide and get back to us.