Question about 1988 Chevrolet S-10
I have an 88 S10 2.8L Auto trans. I need to know how to check for codes without a scanner... I know it's Pre OBDII (OBDI) and I know you can jumper a couple wires in the diag port and count the cel flashes to get the code, but which wires need jumpered? Where can I get a free diagram showing this? It has a problem where, intermittently, it will stall out when coming to a stop. It usually starts a little rough, but does start right back up and will run just fine as long as it has some throttle above idle. It does lag really bad and takes a while to pick up speed and upshifts too early. The oil pressure switch leaks at a pretty steady drip while the engine is running. The cel does come on steady, but doesn't necessarily go into failure when the cel comes on. I have heard that the torque converter can cause the stalling issue, but would it cause the hard start issue as well? I have also heard that the leaky ops can cause both and a faulty coolant temp sensor, a faulty map sensor, a faulty ign mod, a faulty egr valve (which, btw, I can not find on this particular truck... I know where it is supposed to be though) and a few other things. Can someone please help me with this? Can someone email me the diagram for the jumper setup to check for codes please?! This is a daily driver and needs to be dependable. Any help will definitely be greatly appreciated!!!!!!!!!!!! Thank you...
If it needs to be fixed, pay a qualified repair shop to fix it. if the oil pressure switch is leaking, replace it, it also runs the fuel pump, which COULD cause some of your problems.to get codes connect the upper 2 pins on the plug. counting the cavities in the plug, it would be number 5 and 6. If you cant find the egr valve (maybe someone removed it) you need someone working on it that know what they are doing, other wise you will spend money and time on parts you dont need.
Posted on Sep 25, 2009
This system does not require the use of special diagnostic equipment for testing. A digital voltmeter with 10 megohm impedance, an ohmmeter capable of low level readings, a tachometer, test light, hand vacuum gauge and pump and jumper leads are required.
To extract a trouble code from the ECM for diagnostic purposes, the Assembly Line Communication Link (ALCL) connector, is used.
The ALCL diagnostic connector is located in the passenger compartment. Terminal B of the connector is the test terminal and terminal A is the ground used for diagnostic display.
If the test terminal is grounded with ignition on and engine not running, the system will enter the diagnostic mode. In this mode, the ECM will display a Code 12 three consecutive times by flashing the "Check Engine" or "Service Engine Soon" light. A Code 12 consists of one flash, a short pause, then two flashes in rapid succession. After Code 12 is displayed, any stored trouble codes will be displayed three times each by flashing the "Check Engine" or "Service Engine Soon" light, then Code 12 will be displayed again. In the diagnostic mode, the ECM will also energize all ECM controlled relays and solenoids.
After determining the trouble code(s), refer to "Trouble Code Identification."
If the test terminal is grounded with the engine running, the system will enter the field service mode. In this mode, the "Check Engine" or "Service Engine Soon" light will indicate whether the system is in open or closed loop operation. If the system is in open loop operation, the light will flash approximately two and one-half times per second. Closed loop operation is indicated by the light flashing approximately once per second. In closed loop operation, the light will stay out most of the time if system is too lean and remain on most of the time if system is too rich.
Posted on Sep 25, 2009
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Posted on Jan 02, 2017
SOURCE: I have a 1994 Oldsmobile
You can either take it to Advance Auto - Auto Zone or Pep Boys as these 3 do systems checks.
Try taking down the VIN# - call a dealer and ask about recalls or Service Bulletins.
Best of it
Gary @ Fix Ya
Posted on Aug 31, 2010
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