Main IndexAuto Repair Home Search Posts SEARCH
POSTS
Who's Online WHO'S
ONLINE
Log in LOG
IN









Search Auto Parts

Malibu 2015 stalling and struggles with gears


  Email This Post



Jdorival
User

Jun 17, 2020, 9:58 AM

Post #1 of 21 (559 views)
Malibu 2015 stalling and struggles with gears Sign In

Hi everyone,

I'm the owner of a chevy Malibu 2015 LS, 2.5l engine, automatic transmission, 130k miles. Recently I have several issues with the car (engine or transmission), here is the list:

- It sometimes hesitates between gears when I drive on the interstate (~60mph). It tries to change down a gear and instantly put the other gear back on (it did 6-5-6 in a second), and it did that like 10 times in 5 minutes..
- The hesitations cause the car jerking
- It stalls sometimes when the car is "cold" (it is > 80°F outside), and at idle (with the stick either in park or in drive position)
- There is a liquid noise when I push the accelerator in the 3-5 minutes following the start, it stops doing that noise after (the transmission fluid has been changed and engine oil replaced to try to solve the previous issues and it does this sound since that)
- The car is very often running at very low rpm, which causes a lost of power, and all the issues occur at low RPM

- it struggles or don't want to change down the gear when at low RPM and starting to go uphill (especially on the interstate where it remains stuck either in 6 on in 5).
- I don't have any issues when I drive the car in "manual", the gears are responsive and change very smoothly.
Does anyone have any idea what could be the problem?

Thank you
And sorry for the bad English, I'm French and I came in US just recently.
Jonathan


(This post was edited by Jdorival on Jun 17, 2020, 10:01 AM)


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 17, 2020, 10:24 AM

Post #2 of 21 (552 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

The first think you need to do it get a complete scan of all modules in the system.

This DOES NOT mean hook up a code reader for generic codes. You need a professional scan tool with the ability to scan all the modules in the car at the same time. This won't be free but is necessary.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Jdorival
User

Jun 17, 2020, 12:01 PM

Post #3 of 21 (543 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Thank you for your reply. So where can I have a complete scan? at the dealer maybe ?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Jun 17, 2020, 12:05 PM

Post #4 of 21 (541 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Sure, that's one place but there are many Independents that have that ability also for less money. Look for a shop that does diagnostic work.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Jun 17, 2020, 2:28 PM

Post #5 of 21 (525 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Yes, same with Hammer Time. Just because you hear some "sloshing" as you put it, do check coolant level if possible on this at the radiator or pressure tested as well. If that's air inside a closed system it's overheating that will throw off the show for lots of things.


Bonjour mon ami :-)


T



Jdorival
User

Jun 18, 2020, 10:02 AM

Post #6 of 21 (491 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Thank you both. I will bring the car to the dealer next week to have a complete scan and I'll let you know what they say.

Merci beaucoup :)


Jdorival
User

Oct 5, 2020, 2:18 PM

Post #7 of 21 (281 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

So, after a few months struggling between mechanics... Chevrolet changed the crank sensor. It worked great during two days, and then the same symptoms appeared again. They changed it a second time for free.. Same again. It seemed that when I unplugged the battery and plugged it back, it solved the problems during a few moment. Until the same issues appeared. I brought them back the car one more time. This time they have sealed a small vacuum leak by screwing two screws near the catalytic converter. It's better, but the car still has some issues. It still doesn't have much power, drives at low rpm, rpm are still not stable during idle (the car doesn't stall anymore), and it is sometimes hard to start the car (it cranks but starts only after a few seconds).
So I'm not sure if it is an electronic issue of some kind (sensor or else) or if something goes wrong during the ignition process (maybe another vacuum leak or a bad injection, misfire...)
Any thoughts ??

Thank you


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 5, 2020, 2:32 PM

Post #8 of 21 (279 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

It really sounds like something is effecting the fuel mixture.

When you disconnect the battery you are resetting all the fuel adaptives to default and it runs good but after you drive it for a while, the computer is mistakenly compensating for something it's being told by one of the sensors. The dealer should be able to figure this out and I wouldn't let them walk away from it.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Jdorival
User

Oct 6, 2020, 6:32 AM

Post #9 of 21 (256 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Thank you. Yes it would explain a lot of thing... Any idea what sensor could cause this? Or is it possible that the computer is down?
I'm pretty tired about the dealer who takes 2 weeks everytime... Do you think it would be better to bring the car to a mechanic specialized in diagnostic, to a specialist of the electronic in cars or to the dealer one more time ?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 6, 2020, 6:41 AM

Post #10 of 21 (252 views)
Re: Malibu 2015 stalling and struggles with gears Sign In


Quote
Do you think it would be better to bring the car to a mechanic specialized in diagnostic, to a specialist of the electronic in cars or to the dealer one more time ?


Independents are just fine as long as they are truly electrical diagnostic specialists. Never a chain store.

There are numerous sensors that can effect fuel mixture

0/2 sensor
MAF sensor
MAP sensor
IAT sensor
CTS sensor
TPS sensor

Your car may not be equipped with all of those



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



(This post was edited by Hammer Time on Oct 6, 2020, 6:42 AM)


Jdorival
User

Oct 6, 2020, 8:13 AM

Post #11 of 21 (237 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Thanks again :) I'll bring the car to the electrical diagnostics expert then. I'll keep you informed how it turns out


Jdorival
User

Oct 12, 2020, 12:10 PM

Post #12 of 21 (194 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

The guy thinks it is the main wiring harness. He asks 1600$ for it. Do you think it could be the cause of all the problems?


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 12, 2020, 12:28 PM

Post #13 of 21 (184 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Wiring can always be a cause. I hope he is not just guessing and actually did some testing to come to that conclusion.

Also, if you approve the job make sure he actually replaced the harness and not just repair a few wires instead.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Jdorival
User

Oct 12, 2020, 12:31 PM

Post #14 of 21 (179 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Ok I'm gonna see that with him. Thank you so much for your advices, I really appreciate it!!


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 12, 2020, 12:33 PM

Post #15 of 21 (177 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

You're welcome. Let us know the results.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Jdorival
User

Oct 12, 2020, 1:15 PM

Post #16 of 21 (167 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

It would only be to repair it... I'm not sure it is worth it...


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 12, 2020, 1:18 PM

Post #17 of 21 (161 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

That's a lot of money to just repair a harness if they already know where the problem is.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



Jdorival
User

Oct 13, 2020, 7:30 AM

Post #18 of 21 (145 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

Yes that's my opinion too. So I will pick up the car and probably bring it to the junkyard..


Tom Greenleaf
Ultimate Carjunky / Moderator
Tom Greenleaf profile image

Oct 13, 2020, 9:15 AM

Post #19 of 21 (131 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

! If you are giving up over this on a FIVE year old car I question why? Sell it if you are sick of it stating the problem you have. Some "junkyards" will buy cars that are fixable not to be "salvaged" for parts if this is OK otherwise.


That or find some better help to focus right where this problem is if not stated other than "whole harness" for a fortune. It's been a while I'm sure you are just sick of it but can get some good money out of it as fixable most likely and move on zillions of people can't deal with problem cars/trucks just the time and headache of it all (mal de tete) as you say :-)


Tom



Jdorival
User

Oct 13, 2020, 10:30 AM

Post #20 of 21 (124 views)
Re: Malibu 2015 stalling and struggles with gears Sign In

It has a rebuilt title as a previous owner had a wreck with it. Everything was replaced or repaired after the wreck, except for the "invisible" issues that remain... It had a water entry at some point, that I fixed, but I'm afraid it had caused damage to the electronic in the car. So I think I'll bring it to a last mechanic (look like Nashville is seriously lacking of good mechanics...) and see how much they ask for it. In the meantime, I'll post an announce to try to sell it, stating the problem.


Hammer Time
Ultimate Carjunky / Moderator
Hammer Time profile image

Oct 13, 2020, 10:57 AM

Post #21 of 21 (118 views)
Re: Malibu 2015 stalling and struggles with gears Sign In


Quote
It had a water entry at some point, that I fixed, but I'm afraid it had caused damage to the electronic in the car.


I wish you had said that in the first place. That paints a whole different picture of the situation. There is a reason that insurance companies automatically total water damaged cars. Water damage is a problem that never stops giving. As time goes on, the problems just keep getting worse.



~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.







  Email This Post
 
 


Feed Button




Search for (options) Privacy Sitemap