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Injectors

Tiny
JUANJOAGUDELO
  • MEMBER
  • 2007 CHEVROLET AVEO
  • 55,000 MILES
Hello, thank you for helping me figuring out this problem.
I measured the resistance in the injectors in my Aveo and all of them show zero resistance. I am having very hard start (car cranks normally but wont start) when car is cold and gas consumption has increased. When car has warmed up it starts just fine.
I replaced spark plugs, ignition wires, checked the fuel pump and it maintains pressure at 56 PSI, no pressure drop noticeable after car is off. Battery is good, checked the intake air sensor and seems to be working fine. Coil seems to be giving spark (although it look a little yellowish to me) also checked for vacuum leaks and it seems fine.
I listened for the injectors and they sound click, click as if they would be working fine, but the resistance measured with a multimeter shows zero in all of them. Is that normal?
I try to look for fuel pressure regulator but was unable to fine.
I find strange that all of the injectors show zero resistance. Can they all go bad at the same time, yet the car runs fine after it starts?
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Sunday, November 13th, 2011 AT 2:05 AM

10 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
That doesn't make sense. Are you sure the multimeter was set correctly?
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Sunday, November 13th, 2011 AT 2:07 AM
Tiny
JUANJOAGUDELO
  • MEMBER
  • 14 POSTS
I am sure, I just checked them again. That is what the multimeter shows.
All of them show zero ohms
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Sunday, November 13th, 2011 AT 2:51 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
Do me a favor, take the multi-meter and go to a parts store and check a new one.
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Sunday, November 13th, 2011 AT 2:59 AM
Tiny
JUANJOAGUDELO
  • MEMBER
  • 14 POSTS
I bought a new multimeter and the injectors all read 10.4 ohms. Thank you but now I am were I started. I have no idea what the problem could be. I also checked the resistance in the coil pack and between a-c is 1.2 ohms, and between b-a is 0.7 ohms.
The car is still very hard to get it to start in the morning. Please. Help!
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Monday, November 14th, 2011 AT 3:25 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
I thought I was losing my mind when you said they all were at 0 ohms and the car ran. Okay, you mentioned that it has 56 psi from the fuel pump. Is that cold? Also, when you check spark, is it a hot blue snapping spark?
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Monday, November 14th, 2011 AT 4:39 AM
Tiny
JUANJOAGUDELO
  • MEMBER
  • 14 POSTS
55 psi cold (engine off, key on)and 56-57 right after engine is on. The pressure drops very slowly to 30 psi after 3 hours or more of engine off.
I checked the spark and it looks yellowish but strong. I measured the impedance of the coil and it has a-b-c in the plug. I got 1.2 ohms between a-c and between b-a 0.7 ohms.
Spark was present first thing when cranking the car after sitting over night.
Do you know where would the coolant temp sensor is located in an aveo and how to check if it is working properly?
Thank you again.
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Monday, November 14th, 2011 AT 5:02 PM
Tiny
JUANJOAGUDELO
  • MEMBER
  • 14 POSTS
I need some help locating the coolant temp sensor in a Chevy aveo 2007. I can't find it.
Any help is greatly appreciated.
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Tuesday, November 15th, 2011 AT 12:22 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,874 POSTS
It is on the rear of the cylinder head below the intake. See attached.
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Tuesday, November 15th, 2011 AT 1:30 AM
Tiny
JUANJOAGUDELO
  • MEMBER
  • 14 POSTS
I found it, thank you but it is impossible for me to reach and check. I just don't know if this sensor is creating the problem since I don't get a code from a bad temp cool sensor. The car idles fine and runs just fine after starts. The MPG has gone down to a 20MPG and the only problem is the hard start (cranks but seems to be flooded) It wouldn't even start with the help of starting fluid.
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Wednesday, November 16th, 2011 AT 1:04 AM
Tiny
JUANJOAGUDELO
  • MEMBER
  • 14 POSTS
I found it, thanks.
Is not that sensor, what else is left to check?
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Wednesday, November 16th, 2011 AT 1:13 AM

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