Engine is hard to start?

Tiny
VINNIE LEFTKOWITZ
  • MEMBER
  • 2010 CHEVROLET IMPALA
  • 3.5L
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 170,000 MILES
My car barely starts when cold. Runs rough. I give it some gas and it shakes some then then after warming up it is okay. It starts fine after I shut it off after warm up. Codes P0449 and P0442 and P0445 came up when I took it to AutoZone. I replaced to throttle body and the purge valve for the vapor canister. What could I check next?
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Thursday, January 30th, 2020 AT 7:46 AM

5 Replies

Tiny
KEN L
  • ADMIN
Hello,

I have seen the engine coolant temperature sensor cause this issue not reading correctly while giving the computer a false reading. You can get a scanner to see what the reading is cold to see if it is close to outside temperature to confirm the issue. here's a guide to help and the coolant sensor location so you can check it out:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

and

https://www.2carpros.com/articles/engine-cranks-excessively-before-starting

Check out the diagrams (below). Please let us know what you find. We are interested to see what it is.
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Thursday, January 30th, 2020 AT 10:52 AM
Tiny
VINNIE LEFTKOWITZ
  • MEMBER
No code came up for the coolant sensor when I took it to autozone to get scanned.
3 codes did come up. P0449, P0442, P0445. Are you saying I need buy my own code reader and scan for codes?
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Thursday, January 30th, 2020 AT 12:14 PM
Tiny
KEN L
  • ADMIN
The sensor may not give a code, the P0449, P0442, P0445 are EVAP codes which wont affect the engine running. Have we serviced the throttle body latey? if not this guide can help you:

https://www.2carpros.com/articles/throttle-actuator-service

A scanner is a good idea for anyone that owns a car, you can use it all almost every car out there.
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Saturday, February 1st, 2020 AT 10:25 AM
Tiny
VINNIE LEFTKOWITZ
  • MEMBER
I put a new throttle body on a week ago and a new purge valve for the vapor canister.
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Sunday, February 2nd, 2020 AT 12:05 PM
Tiny
KEN L
  • ADMIN
Sorry, I missed that in the first post. A vacuum leak will cause hard starting also, I would look into the coolant sensor as well, what happens is the sensor range gets off a little (not enough to give a code) but enough to cause engine problems. Did you clear the codes once the new parts were installed?

https://www.2carpros.com/articles/how-to-use-an-engine-vacuum-gauge

Please run down this guide and report back.
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Tuesday, February 4th, 2020 AT 11:08 AM

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