LT1/LT4 Tech 1993-1997

Car loads up with fuel.

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  #11  
Old 08-07-2009 | 09:25 AM
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Paper clip method does not work for your car. You need a scanner, and not a cheap code reader.
 
  #12  
Old 08-07-2009 | 11:17 AM
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Thumbs up Here is the site for paper clip and pin location

http://www.obd1.com/

The ALDL Cable
Let's look at the ALDL (Assembly Line Diagnostic Link) OBD1 interface cable first, since we sell low cost ALDL OBD1 interface cables. It may possibly be the only thing you will need to buy to do your own diagnostics. You can make your own cable, but it is much quicker and less headache to buy one already assembled and tested. Our cables are based on a reliable and simple design, explained here.
Under your cars dash you will most likely see this style connector:



There are other styles of connectors, but the 12 pin OBD1 connector shown above is the most common. Some 1994-95 cars have the 16 pin OBD2 connector (shown below), Corvette's, Camaro's, and LT1 cars among them. Even though it is an OBD2 connector, it has an OBD1 system behind it on these 94-95 cars. If you have a 94 or 95 car with the 16 pin connector, we sell 16 pin connector shell cables for it here.



Make sure you buy the correct ALDL cable setup for your car or cars. Full descriptions are on our order page. You can buy an ALDL Cable with an OBD1 connector shell, or a cable with just a bare male pin, to plug into your cars female connector serial data pin location (pin M or E or 9 on the diagrams above). The ALDL cable with the male OBD1 connector shell will allow you to just feel under the dash and plug the cable in. The cable with just the bare pin requires you to look under the dash and plug into the correct pin on the car side of the connector. If you have a car with an OBD connector other than the standard 12 pin OBD1 connector, you should buy the bare pin cable. The bare pin cable should work on any OBD1 car, but is somewhat less convenient to use. The Quick Paper Clip Test
Since we are looking at the connector pins, it should be mentioned here that a quick method to see which trouble code or codes are being set in your cars ECM is to jumper the A and B pins of the 12 pin ALDL OBD1 connector with a paper clip. While the car is off, sitting still, turn the ignition key forward while this jumper is in place. Do not start the car. The Service Engine Soon ( SES ) light will flash in a repeating sequence, telling which trouble codes have been set in the ECM. A service manual for your year car will have a chart outlining what each trouble code stands for, or this Trouble Code website can be of help. This paper clip method will tell you the trouble code or codes set in your ECM, but it will not tell you what conditions the trouble code is being set under, or let you clear the trouble codes on the fly, as the ALDL cable and PC setup will.

Good Luck !!
 
  #13  
Old 08-07-2009 | 12:47 PM
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z28pete is probably right, I have never tried it, always used a scanner. We need more input on this one from the guys here before you try it , you don't want to dammage that PCM !!
 
  #14  
Old 08-07-2009 | 01:52 PM
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The paper clip method does not work on 94 and newer, not sure about the 93s. Also the $20 code readers do not work on these cars either. Most 94s use a regular OBDI style connector, the 95s and some late 94s use OBDII connectors, but the PCM is still OBDI, so an adapter cable is needed to connect the OBDI scanner to the OBDII style connector. 96 and newer are plain OBDII and cannot be flashed.
 
  #15  
Old 08-07-2009 | 02:16 PM
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93 and some 94s work with the paper clip not sure on the 95s.
 
  #16  
Old 08-07-2009 | 06:23 PM
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Got the codes pulled today.

48 - Mass Air Flow System Failure

32 - EGR System Problem

44 - Left Oxygen Sensor Too Lean

18 - Crank signal open or no signal
 
  #17  
Old 08-07-2009 | 07:16 PM
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I don't know if I told you guys this before, But I just took off my elbow connected to the throttle body, and the underside of that bastard is melted...

I'm hoping that this "bad air" getting into the throttle body is what is causing alot of my problems :|
 
  #18  
Old 08-07-2009 | 07:30 PM
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i would say yes. u need to see if the maf is what melted it.
 
  #19  
Old 08-07-2009 | 07:47 PM
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How would the MAF melt the tube?
 
  #20  
Old 08-07-2009 | 07:47 PM
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Its melted near the throttle body, not the MAF
 



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