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 Old 11-07-2019, 05:44 AM   #1
 
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Default New guy with problems

Hi everyone. I recently purchased a 08 Cx7 with 95k on it. For the past week whenever I drive it jerks and hesitates on acceleration. It doesn't lose power and shifts thru the gears fine. It continues to build power and speed, but it feels like a nurse pumping the blood pressure cuff ball while I press on the petal. If I let go, it stops.

I checked tranny fluid. Good level. Added a fuel injector cleaner, seems to help alittle. So I purchased a new in tank pump thinking the pump wasnt building enough pressure fast enough. Going to install in next few days.

Does anyone have any other ideas what it could be if the pump doesnt help?
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 Old 11-07-2019, 06:27 AM   #2
 
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Default

Welcome!

The symptoms are vague and could point to many things. Since it is a new to you car, maybe start with the basics. New spark plugs and new air filter would be good to do anyway.

Check all hose clamps and hoses from the turbo to intercooler and intercooler to throttle body. Check vacuum lines.

Maybe get some spray MAF cleaner and carefully remove the sensor and clean the element, being careful not to let anything touch it except the cleaner. Let it air dry and reinstall.

Maybe your ECU is cutting fuel or boost. Do you have a check engine light on? If so, get the car scanned for free at a local auto parts store and post the code numbers here.
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 Old 11-07-2019, 07:50 AM   #3
 
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Default

Sorry, I was a but vague and rushed in my original post.

No check engine light to get checked to point me in a general direction. Hasn't come on at all to even hint at something. Did the loose vacuum lines and hoses check already.
Sprayed MAF. Air filter is clean. Didnt do spark plugs, according to Carfax they were replaced in April, plus no code for misfire either. No obvious loose connections of plugs or grounds.

It starts and idles fine and smooth. Rev it in park, no issues. Its when its driving and accelerating. Rpms dont go sky high like its slipping.

If normal acceleration is Raaaaaaa, mine is Ra ra ra ra ra, but still increasing speed and shifting, until I let off the petal.

Thanks
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 Old 11-09-2019, 03:58 PM   #4
 
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Default Update - problem solved

Ok, so I threw in a new In-tank fuel pump. Acceleration problem has stopped. I'm thinking it was original fuel pump, becuase the screws were old and stripped out easily. I had to drill the heads off and spin out the threads. Grabbed new screws from hardware store to re-install metal ring.
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