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I have ever a 07 malibu with a 2.2 4speed auto. I have no

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power on acceleration. Free Rev...
I have ever a 07 malibu with a 2.2 4speed auto. I have no power on acceleration. Free Rev in park it hits 4-4500rpm rev limit. But power brake ingredients it only hits 2000ram. When I put it in low to shift my self it starts off in 3rd not in 1st.
Submitted: 1 year ago.Category: Chevy
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7/25/2016
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago
AMEDEE
AMEDEE, CHEVY TECHNICIAN
Category: Chevy
Satisfied Customers: 27,079
Experience: ASE certified tech ADVANCED LEVEL SPECIALIST. Wisconsin certified emissions state inspector
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Hello and welcome! My name is ***** ***** I can assist you with your question. Can I start by getting the codes in the computer? Thank you!

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Customer reply replied 1 year ago
That's the thing it's not setting any codes
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

How did you check for codes? What tyep of scanner did you use?

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Customer reply replied 1 year ago
My autel maxi Das. I'm a mechanic myself I'm just stumped by this one. If it helps the car sat for about 6 months due to a broken timing guide and I fixed and now this
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Maybe the timing chain was installed incorrectly. What is the engine vacuum at when the engine is at idle?

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Customer reply replied 1 year ago
Timing seems fine. I did it twice due to the fact I thought the same thing. But I will check vacuum.
Customer reply replied 1 year ago
15 inhg at idle and 16 at 2500 rpm
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

The engine vacuum is WAY TOO LOW. Either the timing chain is not installed correctly, the exhaust is plugged or you have a MAJOR air or vacuum leak.

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Customer reply replied 1 year ago
Sticking steady around 16.5 at idle after a min or so
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

It should be closer to 20 inches at idle

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Customer reply replied 1 year ago
What about the trans reading 3rd gear when I put in into low to manually shift it? And the timing is 100% on could it b something else. I don't want to remove it again just to be back at point a.
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

The transmission is controlled based off of the engine performance. The engine needs to be fixed first.

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Customer reply replied 1 year ago
The transmission is electronic controlled. I understand the engine part. But the trans reading 3rd gear at all times is an issue I Will have no power on take off starting in 3rd
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Are there any transmission codes?

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Customer reply replied 1 year ago
No. There is not.
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Usually it will set a code. But if not, and your sure it is related to the transmission, my experience has been that this is caused by a bad shift solenoid or a bad valve body.

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Customer reply replied 1 year ago
Also any where I find the good running vac is 17 to 20 inch hg. And a wot snap sends below 5 inhg and rebounds to 20 or so and that's exactly what I'm getting. I don't think the timing or vacuum is an issue.
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Can upload a picture or video of the vacuum needle with the engine running?

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Customer reply replied 1 year ago
some time today I can.
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Sounds good!

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Customer reply replied 1 year ago
I can do a pic now if I can figure it out
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Thank you for sending the pic! The engine vacuum is too low. It needs to be closer to 19 or 20 inches

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Customer reply replied 1 year ago
2 inhg. If timing was uff it would b more substantial than 2. What are other causes. Also I noticed then in drive watching app and tps sensors the app says 100% wile tps says 34 to 38 %. Should enter they read the same
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

other causes for what? Low power or low engine vacuum?

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Customer reply replied 1 year ago
Guess both. But is 2inhg really going to cause this
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

YES, this is a major issue. If the engine cant breath, it will not produce power. In addition, if you have a transmission issue, it will not accelerate properly. I would fix the engine performance issue first and then move on to the transmission issue if needed.

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Customer reply replied 1 year ago
Any ideas what to check on engine ? Just normal vacuum leaks? If the compression is good on it and good as in 125-130 psi all 4 cyl the valves are good correct. Cuz I know a burnt valve can lead to low vacuum
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Just because compression is good does not mean the valve timing is correct. It can be a tooth or two off and still have compression.

YES burned valve will cause low or no compression on ONE cylinder. But it will not cause low vacuum like you have. It will cause the vacuum needle to fluctuate as the engine is running.

Restricted intake, exhaust valve timing, vacuum leaks or incorrect valve timing can all cause low engine vacuum.

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Customer reply replied 1 year ago
But I have stated I have doubble checked timing even remover the whole timing set and replaced it. Lined the makes up with colored chain marks and marks on new gears. Timing is 100% good. I'm sure of it
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

Ok good. That leaves the other things I mentioned.

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Customer reply replied 1 year ago
Other question is I have a 05 cobalt 2.2 that has 15 inhg and runs perfectly fine. And a 02 civic with 16 that runs perfectly fine. I think my vacuum is fine. I feel this is no help for the 30 some odd dollars. Is there a way to have someone else chime in on this
Chevy Mechanic: AMEDEE, CHEVY TECHNICIAN replied 1 year ago

You bet! I can leave this open for other experts. Good luck!

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Chevy Mechanic: sprinkles08, ASE Certified Technician replied 1 year ago
sprinkles08
sprinkles08, ASE Certified Technician
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Hello and welcome to JustAnswer!

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