Transmission and acceleration

JOEY MAHARAJ

MEMBER
2001 MITSUBISHI LANCER
4 CYL
2WD
AUTOMATIC
60,000 MILES

Good day, mechanics, cs3 Lancer, 4g15 sohc and CVT transmission. Vehicle had 4g18 engine and changed it to 4g15, did not change harness. Check light came on. Driving at for example 2,000 rpm's as I let go of the accelerator the vehicle would hold back at the same speed and if I keep accelerating I only reach about 80 km and would not go further. Although I'm mashing the accelerator. I stopped and take of the negative terminal of the battery, wait 10 seconds and put it back on. No problems so far after I drove it. What is the cause for this? Because I recently serviced the throttle body and air intake manifold.

10 Replies

JACOBANDNICKOLAS

MECHANIC
109,874 POSTS

Hi,

Have you checked for diagnostic trouble codes? When you changed the engine and reused the wiring harness, were there differences? If you haven't checked for codes, I would recommend it. Here is a quick video showing how it is done:

https://youtu.be/YV3TRZwer8k

I realize not everyone owns a scanner. However, most parts stores will do it for free, so try this and let me know the results.

Joe

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Friday, January 31st, 2020 AT 5:55 PM

JOEY MAHARAJ

MEMBER
12 POSTS

No, I don't have a scanner and parts stores don't do that here. I'm from Trinidad, so any knowledgeable answer would be helpful. I was thinking about the spark plugs, last I changed them was in August 2018.

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Saturday, February 1st, 2020 AT 1:50 PM

KEN L

MASTER CERTIFIED MECHANIC
48,356 POSTS

To be sure lets do a CAN scan which is the future of automotive repair you can get a CAN scanner from Amazon for about $50.00.

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Saturday, February 1st, 2020 AT 1:51 PM

JOEY MAHARAJ

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12 POSTS

Okay then, I will take in consideration of buying a scanner, but since I reset the computer. I haven't have a problem, running as normal as it should.

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Sunday, February 2nd, 2020 AT 10:32 AM

JACOBANDNICKOLAS

MECHANIC
109,874 POSTS

Hi,

If it's running good and the light hasn't come back on, it may be fine. However, I agree with Ken. Let us know if there is anything other we can help with.

Joe

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Sunday, February 2nd, 2020 AT 6:51 PM

JOEY MAHARAJ

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Okay cool, thanks.

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Tuesday, February 4th, 2020 AT 3:40 AM

KEN L

MASTER CERTIFIED MECHANIC
48,356 POSTS

Here is a video to show you how:

https://youtu.be/InIlnsjOVFA

It sounds like the car is going into limp mode. here is a guide:

https://www.2carpros.com/articles/reduced-power-limp-mode

Please run down this guide and report back.

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Tuesday, February 4th, 2020 AT 10:55 AM

JOEY MAHARAJ