Got 2 questions
Thread Starter
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Joined: Jun 2004
Posts: 56
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From: Fort Worth Texas
Got 2 questions
I've got a 93 LT1, 121K miles, I have a mildly rough idle and I want to check the resistance of the Injectors, but not sure how. Do I check them while it's running, ignition on but not running, or ignition off?
Also, I checked my DTC and have a history code of 64, this code is not in my FSM for the 93 so I'm curious of the strange code. Anyone experience this?
Thanks for the help in advance.
Marlon
Also, I checked my DTC and have a history code of 64, this code is not in my FSM for the 93 so I'm curious of the strange code. Anyone experience this?
Thanks for the help in advance.
Marlon
Instructor
Joined: Mar 2008
Posts: 111
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From: York PA
unplug each injector when its not running key off (cold engine) then check the injectors all should be close in range. then check them when the engine is up to operation temp key off. I still dont know how close the years are but code 64 on a 95 is throttle position signal malfunction. if you want I can run out and see what my injectors are with a cold engine. I hope this will lead you in the right direction.
ED
ED
Instructor
Joined: Mar 2008
Posts: 111
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From: York PA
Thats why I said I still dont know how close the years are.
DTC 64 Throttle Position Signal Malfunction 1995 BOOK 1 5E2-73.
Book 2 for 1995 6E3-A-94 is DTC 56 (secondary air inlet valve actuator vacuum sensor circuit).
Sorry I tried to help with what I had. All that was needed is a member to say the years differ when it comes to the codes not(it must not be GM) I dont know alot about the changes through the years. Please read the full post before you try to make me look like I dont know what I'm writing about (code 64 on a 95 is throttle position signal malfunction). I would not reply unless I thought I could help even if was just a guess.
Safety Car
Joined: Jun 2006
Posts: 3,629
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From: FL
Thats why I said I still dont know how close the years are.
DTC 64 Throttle Position Signal Malfunction 1995 BOOK 1 5E2-73.
Book 2 for 1995 6E3-A-94 is DTC 56 (secondary air inlet valve actuator vacuum sensor circuit).
Sorry I tried to help with what I had. All that was needed is a member to say the years differ when it comes to the codes not(it must not be GM) I dont know alot about the changes through the years. Please read the full post before you try to make me look like I dont know what I'm writing about (code 64 on a 95 is throttle position signal malfunction). I would not reply unless I thought I could help even if was just a guess.
DTC 64 Throttle Position Signal Malfunction 1995 BOOK 1 5E2-73.
Book 2 for 1995 6E3-A-94 is DTC 56 (secondary air inlet valve actuator vacuum sensor circuit).
Sorry I tried to help with what I had. All that was needed is a member to say the years differ when it comes to the codes not(it must not be GM) I dont know alot about the changes through the years. Please read the full post before you try to make me look like I dont know what I'm writing about (code 64 on a 95 is throttle position signal malfunction). I would not reply unless I thought I could help even if was just a guess.
Instructor
Joined: Mar 2008
Posts: 111
Likes: 0
From: York PA
Instructor
Joined: Mar 2008
Posts: 111
Likes: 0
From: York PA
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Thread Starter
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Joined: Jun 2004
Posts: 56
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From: Fort Worth Texas
Thanks guys for your help. I do have the GM FSM, I'm just not used to reading it. I found the DTC 64 from the page you listed toptech. Thanks. I was looking at pages 8D-6 and 8D-7.
Thanks for the info on the injectors. I will still check them, they are the originals and may still be causing some loss of power.
thanks again.
Marlon
Thanks for the info on the injectors. I will still check them, they are the originals and may still be causing some loss of power.
thanks again.
Marlon
Safety Car
Joined: Jun 2006
Posts: 3,629
Likes: 28
From: FL
Thanks guys for your help. I do have the GM FSM, I'm just not used to reading it. I found the DTC 64 from the page you listed toptech. Thanks. I was looking at pages 8D-6 and 8D-7.
Thanks for the info on the injectors. I will still check them, they are the originals and may still be causing some loss of power.
thanks again.
Marlon
Thanks for the info on the injectors. I will still check them, they are the originals and may still be causing some loss of power.
thanks again.
Marlon
Racer
Joined: Sep 2007
Posts: 393
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From: Bartonville Illinois
Its OK to check your injectors cold, but to me it makes more sense to check them after reaching temperature. If the insulation on the windings is breaking down then it will be more noticeable when they are hot. The windings can begin shorting together, thereby lowering the resistance of the coil and causing more current draw on the circuit.
Just get the car up to temp, shut the car off and unplug the injectors and take the resistance readings. There is no polarity when checking these.
If you have a mechanics stethescope you can also listen to them while running and see if there is any noticeable difference.
Just get the car up to temp, shut the car off and unplug the injectors and take the resistance readings. There is no polarity when checking these.
If you have a mechanics stethescope you can also listen to them while running and see if there is any noticeable difference.
Last edited by RACER 1993; Jul 4, 2008 at 04:26 PM.
Thread Starter
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Joined: Jun 2004
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From: Fort Worth Texas
I had it set at 2K, but that doesn't matter. I can just move the decimal point, and it would read 12 if I had it set on 20 ohms. Nevertheless, sounds like they are out of spec. Even though they are all exactly the same. I guess they are failing at the same rate.
Thanks,
Marlon
Thanks,
Marlon
Melting Slicks
Joined: Oct 2004
Posts: 2,510
Likes: 4
From: Austin Texas
That O2 sensor error code should be looked at, and corrected first. A bad O2 sensor can give faulty closed-loop feedback to the PCM which can lead to poor and erratic idling(incorrect AFR which would cause either a lean or rich condition on the bank controlled by the faulty O2 sensor).
How is your idle during Open-Loop operation ? If the idle seems OK when you first fire up the engine, it is most likely a bad O2 sensor..
For a detailed description of how the O2 sensors work in "Open" and "Closed" Loop mode, refer to the section "LO2/RO2 (Left O2 Sensor/Right O2 Sensor)" in the following article:
http://members.aol.com/InjuneerZZ/Sc....htm#step%2017
There is a lot of very good information on other sensors as well.....
Last edited by MikeC4; Jul 6, 2008 at 09:19 PM.
Racer
Joined: Sep 2007
Posts: 393
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From: Bartonville Illinois
I had it set at 2K, but that doesn't matter. I can just move the decimal point, and it would read 12 if I had it set on 20 ohms. Nevertheless, sounds like they are out of spec. Even though they are all exactly the same. I guess they are failing at the same rate.
Thanks,
Marlon
Thanks,
Marlon
Your injectors may be dirty but they seem to read fine electrically.