Tip & How-To about GMC Blazer

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On gm vehicles that are 1993 and older with an ecm,it is possible to diagnose check engine light using a paper clip.just below driver is a black box that has either 6 or 12 slots.put paper cilp one end in slots a and 1in slot b then watch check engine light.count flashes ,should flash once then pause then it will flash 2 times indicating a code 12 it will flash thic code thee times indicating computer is working after the code 12 it will flash the trouble codes.

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1993 olds 88 3.8 engine starts but unless I play with the gas it dies, i put new fuel pump, fuel pressure regulator when it dies I get a puff of black smoke


You need to retrieve the fault codes if any are present to help diagnose this issue. To do that go to the links below. Forst is how to get the codes, then a list and meaning of fault codes for all early GM models.
FAQ How to read older GM codes for free

http://www.gmtuners.com/OBD1_DTC.htm

Aug 11, 2016 | Cars & Trucks

1 Answer

What is the diagnostic code?


96 and newer is the OBD-2 scanner to use, for 95 and older gm vehicles go to this site for the codes--- www.gmtuners.com/0BD1_DTC.htm----- heres how to read codes on 95 and older, The ALDL connector is on the driver side of the car by the steering column. Short the A and B pins together, which is the two pins in the upper right hand section of the plug. Make sure the key is on, but the engine is off. That will make the check engine light flash whatever codes are stored in the computer. You can use a paper clip to short the pins together. Hope this helps. to read codes, 3 flashes of check engine light, then pause then 2 more flashes indicates problem code 32. thats how you read the codes. so have something to write them down so you can keep track of the codes.

Jan 23, 2011 | 1993 Buick LeSabre

1 Answer

car stops running


need to know what trouble codes u have in the ECM's (computer) memory, below is how to run the test. let me know what you find

go to the web link for instructions.

http://check-engine-light-codes.blogspot.com/2006/03/gm-1983-95-vehicles-obd1-codes-self.html

May 21, 2010 | 1995 Buick Riviera

1 Answer

i have a 1993 chevy k1500 5.7 liter 4wd with a 40L60E transmission and it will not shift out of 2nd gear what could the problem be


Your truck could be on a limp mode since your transmission is controlled by the ECM. 
Here is a way for you to retrieve the fault codes in the ECM that is keeping your transmission from shifting past 2nd gear. Just be careful not to burn out the transmission.
On board diagnostic (OBD) was designed on vehicles equipped with electronic fuel injection so you can generally retrieve the codes yourself. No need buying a scanner or running to any parts stores to check the engine light. This system is called obd1 and applies to most vehicles made before 1995 for domestics and 1993 on imports. 

For GM domestic vehicles made before 1995, the diagnostic connector is located under the dash panel by the driver side. To get the check engine codes to flash in your dash panel, use a jumper wire or a paper clip and connect terminals A and B of the diagnostic connector. Turn your ignition key on with engine off and the codes should start to blink. All codes should start with code 12 which is one long flash followed by 2 short flashes. This code 12 means the diagnostic system is normal and will repeat itself continuously if there are no trouble codes. Otherwise, code 12 will flash 3 times before flashing the fault codes.

For GM and domestic vehicles and most of the codes can be erased or cleared by disconnecting the battery negative terminal for 1 minute and reconnect. Just make sure to check your service manual in case you have electronic equipment such as radio or clock that needs reprogramming in which battery disconnection is not recommended. Finally after performing repairs on the culprit code, always go for a road test to confirm if the problem is fixed.

Good luck and here is a link for the OBD 1 codes. http://chevythunder.com/199295_lt1_trouble_codes.htm#Code 28

May 03, 2009 | Chevrolet 1500 Cars & Trucks

1 Answer

low idel rough


You could have a Air Idle Control valve or sensor problem. Your going to have to scan the ECM to find out if it is your (IAC).
Here is how to check your ECM for Codes. 
On board diagnostic (OBD) was designed on vehicles equipped with electronic fuel injection so you can generally retrieve the codes yourself. No need buying a scanner or running to any parts stores to check th3 Engine Light. This system is called obd1 and applies to most vehicles made before 1995 for domestics and 1993 on imports. In this article, I will discuss the methods used by domestic vehicle manufacturers on how to check the engine lights in their cars and trucks.
For GM domestic vehicles made before 1995, the diagnostic connector is located under the dash panel by the driver side. To get the check engine codes to flash in your dash panel, use a jumper wire or a paper clip and connect terminals A and B of the diagnostic connector. Turn your ignition key on with engine off and the codes should start to blink. All codes should start with code 12 which is one long flash followed by 2 short flashes. This code 12 means the diagnostic system is normal and will repeat itself continuously if there are no trouble codes. Otherwise, code 12 will flash 3 times before flashing the fault codes.
The codes can be erased or cleared by disconnecting the battery negative terminal for 1 minute and reconnect. Just make sure to check your service manual in case you have electronic equipment such as radio or clock that needs reprogramming in which battery disconnection is not recommended. Finally after performing repairs on the culprit code, always go for a road test to confirm if the problem is fixed.
Good Luck and here is a link for gm codes.http://chevythunder.com/199295_lt1_trouble_codes.htm#Code

May 02, 2009 | Chevrolet C1500 Cars & Trucks

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