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05-28-2016
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#1 |
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Join Date: May 2016
Location: Bergen County, NJ
Posts: 44
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Code help h55 and h64
So my car is throwing codes h55 and h64. It's riding rough around 3000 rpms and the power seems limited.
Anyone familiar with this problem? |
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05-29-2016
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#2 |
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Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Re: Code help h55 and h64
We're two! See my thread here:
http://www.zr1.net/forum/showthread.php?t=26445 Keep me updated if you find something! Are your codes intermittent? What year is your ZR-1? EDIT: I searched and I noticed yours is a 1991, just like mine. Take also a look at this thread there: http://www.corvetteforum.com/forums/...-and-64-a.html Changing my o2 sensors is my next step. Last edited by MuRCieLaGo; 05-29-2016 at 03:09 AM. |
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05-29-2016
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#3 |
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Join Date: May 2016
Location: Bergen County, NJ
Posts: 44
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Re: Code help h55 and h64
Seems like it's either the O2 sensor or ecm, leaning towards ecm since it feels like power mode is not getting selected. Does that make sense?
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05-29-2016
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#4 |
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Join Date: Aug 2014
Location: Trois-Rivieres (QC)
Posts: 473
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Re: Code help h55 and h64
What do you mean by "power mode is not getting selected"? For your information, when you got a SES light, you can't enable "Full engine power".
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05-29-2016
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#5 |
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Join Date: May 2016
Location: Bergen County, NJ
Posts: 44
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Re: Code help h55 and h64
I think if there is an issue with the ecm it can result in the power mode being "unselectable"
Interestingly I drove it again this morning and it seemed to run fine, now I'm wondering how far to push it before diving in deeper. |
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05-29-2016
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#6 |
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Join Date: Apr 2009
Location: Prather, CA
Posts: 809
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Re: Code help h55 and h64
If the check engine light is on, the ECM won't let full power mode turn on, even if the code is not related to the secondary system.
__________________
[IMG]http://i13.photobucket.com/albums/a292/bdw18_123/_zr1netforumsigphoto.jpg[/IMG][B] 1990 Corvette ZR-1 [/B][I] White/Flame Red, #2299, mostly stock, 144K miles.[/I] -Cams timed to the '93-'95 405HP LT5 stock timing. -IAT sensor relocated to below front bumper. -Haibeck hoops installed in airduct. -OBX cat-back exhaust. [COLOR=DarkRed][B](SOLD - December 2012 [/B][/COLOR][COLOR=DarkRed][B]:hello:)[/B][/COLOR] 1993 Corvette Coupe Black/Black, 6-speed (SOLD - October 2009 :hello:) |
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07-13-2016
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#7 |
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Join Date: May 2016
Location: Bergen County, NJ
Posts: 44
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Re: Code help h55 and h64
Swapped out the injectors and all is good now....!
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07-13-2016
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#8 |
 Join Date: Jun 2015
Location: Texas
Posts: 530
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Re: Code help h55 and h64
For future reference, the GM Service Technology Group Fuel and Emissions Course handbook, states that Code 55 is "Fuel Lean Monitor" It gives 3 possible causes
1. Secondary ignition insulation fault 2. Lean Injector 3. Inlet filter restriction to injector. Code 64 is "right Oxygen Sensor signal-lean" It gives several causes one of which is injector restriction - right bank So it looks to me like you nailed it by changing out the offending injector. Good work. |
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