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05-11-2014
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#1 |
Join Date: May 2013
Location: Chicago
Posts: 980
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testing the ALCL. poor cold start running
What are the pins and their location on the ALCL to test for trouble codes? I am referring to the paper clip method. If I remember correctly they are the slots in the upper right corner but I am may be wrong.
I started my z yesterday and not more than 100 feet later the car began to stumble and almost cut off. After warming up it went away and began to drive fine except for a slight bog in 2nd gear under load. The car has about 68K on the clock and there seem to be a lot of original parts on the car. I have replaced the coils and wires. The prior owner installed new FIC injectors that are ethanol compliant. Thanks ahead of time!
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* Last edited by Karl; 05-11-2014 at 10:43 PM. |
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05-11-2014
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#2 |
 
Join Date: Jul 2007
Location: Bartlett, IL
Posts: 7,169
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Re: testing the ALCL. poor cold start running
Did you get a Set light? If not, you may not see any codes
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1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Custom Interior NCM Lifetime Member #978 |
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05-11-2014
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#3 |
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Join Date: May 2013
Location: Chicago
Posts: 980
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Re: testing the ALCL. poor cold start running
No SES light.
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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05-11-2014
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#4 | |
 
Join Date: Mar 2014
Location: Warrington PA
Posts: 1,914
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Re: testing the ALCL. poor cold start running
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Not being too familiar with the LT5, I would assume that you start from the beginning. Such as, fuel delivery, spark (ignition), grounds, etc.,etc. If the engine doesn't have a code, you would need to go through each system to narrow down the source of the problem....JMO
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Tom 1994 ZR-1 #009 "captured test fleet car" 1974 LS4 454 Vert 1974 L-82 355 Vert. 1982 L83 CFI...now a retired "dd"....Sold WAZOO Member |
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05-11-2014
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#5 |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: testing the ALCL. poor cold start running
The ZR-1 is an OBD-1 car. Pins and pulling codes is the same across all vehicles.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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05-11-2014
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#6 |
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Join Date: May 2013
Location: Chicago
Posts: 980
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Re: testing the ALCL. poor cold start running
I assume they are the top two right pin holes, pin A & B?
FEDCBA G
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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05-11-2014
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#7 |
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Join Date: May 2013
Location: Chicago
Posts: 980
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Re: testing the ALCL. poor cold start running
Never mind, I just tested the ALCL and it threw no codes.
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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05-12-2014
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#8 |
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Join Date: May 2013
Location: Chicago
Posts: 980
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Re: testing the ALCL. poor cold start running
I am beginning to think I may have a fuel problem
Is there anything specific about the ZR-1 fuel system any care to share? In particular how the fuel pumps work? I just connected a fuel pressure gauge and it would not move past 20 psi at idle and it bounced maybe to 25 psi while driving the car. I think either my fuel filter is clogged or the problem lies within the fuel pumps and or assembly. I put the gauge on my daily driver Malibu and it held 30 psi so I know the gauge is working. Is this normal fuel pressure for the LT-5?
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1993 ZR-1 #211 Yellow On Beige Beast #2 1992 ZR-1 #427 Black On Black *Sold* 1985 L98 Blue On Blue *Sold* |
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05-12-2014
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#9 | |
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Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: testing the ALCL. poor cold start running
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The FP should be in the 43+# range. If you haven't changed the filter, you should do it anyway. You may want to check the pumps. If they are original, it can also be an issue w the plastic clamps in the tank. They may be loose enough so that they lose pressure sort of like a leaky blood vessel. If not that, could be time to change the pumps
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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05-12-2014
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#10 | |
 Join Date: May 2013
Location: Beaver, PA
Posts: 516
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Re: testing the ALCL. poor cold start running
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Linear Mode
