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1994 Chevy S-10 Looking for a jesus... a jesus of car to help save this one
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llucas_4
Novice
Nov 15, 2012, 5:50 PM
Post #1 of 6
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1994 Chevy S-10 Looking for a jesus... a jesus of car to help save this one
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Can someone point me in the right direction? I recently acquired a fairly rundown 1994 chevy s-10. I noticed that the heater core was leaking. So we replaced the heater core. At the same time I realized the previous owner used the wrong coolant so I flushed the system and replaced the coolant with the suggested type.
The car ran fine for a few days but then I took it out on the interstate for a few miles. The truck started to get noticeable bad gas mileage....10 mpg. Also I noticed the battery gauge was at 1/2 charge when normally it never left full charge. The thermostat barely left its position that its in when the engine is off. I was at a friends house for a few hours then I started to drive the truck home. The truck died no power steering, hard brake, all of the cab lights were however still on. Pushed to the side of the road, a few minutes later gave it another try and the engine started up. Drove 2 more miles and died once again no power steering, hard brake, lights still on in car and headlights as well even though the gauges showed no battery. Tryed to start again, but it wouldn't start would only turn over. Towed it home 2 days later headlights and cab lights still worked.
2 weeks went by and I was so busy I didn't even have time to look at it. Went out to run a diagnostics using the paper clip and check engine light method. Battery dead, recharged it. No luck got the everything is fine signal. Checked the the battery and alternator both are working fine.
Some other factors are once I bought the car I ran an engine cleaner in with the gas, wondering if it maybe cleaned out to much crap and is plugging something up. The engine fan has been hitting the lower shroud cover to the point that there is a whole chunk missing out of it. The heat controls need to be reset as they are on the default of heat to windshield and feet and cannot be changed. Some wiring might have come loose in the heater core replacement.
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 15, 2012, 6:35 PM
Post #2 of 6
(2207 views)
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Re: 1994 Chevy S-10 Looking for a jesus... a jesus of car to help save this one
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4 or 6 cylinder? If a 6 cylinder is it CPI or TBI? Is the check engine light on?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 15, 2012, 6:39 PM)
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llucas_4
Novice
Nov 15, 2012, 11:39 PM
Post #3 of 6
(2166 views)
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Re: 1994 Chevy S-10 Looking for a jesus... a jesus of car to help save this one
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V6, TBI. The check engine light would occasionally blink on but would usually blink off shortly after.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 16, 2012, 4:09 AM
Post #4 of 6
(2154 views)
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Re: 1994 Chevy S-10 Looking for a jesus... a jesus of car to help save this one
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You need to read the code first.
To extract a trouble from the computer for diagnostic purposes, the Assembly Line Communication Link (ALDL) connector is used.
Ground terminals A and B with the ignition "ON" and engine not running. The system will enter the diagnostic mode. In this mode, the computer will display a 12, three consecutive times, by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" or light. A 12 consists of one flash, a short pause, then two flashes in rapid succession.
After 12 is displayed, any stored trouble s will be displayed by flashing the "CHECK ENGINE", "SERVICE ENGINE SOON" or "MALFUNCTION INDICATOR LAMP" light. All s are displayed 3 times each then a 12 will repeat. In the diagnostic mode, the computer will also energize all computer controlled relays and solenoids.
ALDL Connector (Located Underdash)
The ALDL diagnostic connector is located in the passenger compartment.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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llucas_4
Novice
Nov 27, 2012, 4:45 PM
Post #5 of 6
(2034 views)
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Re: 1994 Chevy S-10 Looking for a jesus... a jesus of car to help save this one
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Update on the truck. Bought an obd1 scanner. By the time I got it the battery in the truck was dead and would no longer hold a charge. Replaced the battery and the truck started right up. Plugged in the scanner and tried to read the history but it appears that the history was cleared. Drove the truck around for a few days and all the sudden the truck started to rev up and then go back to normal when I came to a stop. The check engine light came back on after a few more days. Still having the scanner in my truck I plugged it in. It read 13, oxygen sensor circuit open.
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Hammer Time
Ultimate Carjunky
/ Moderator
Nov 27, 2012, 4:55 PM
Post #6 of 6
(2027 views)
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Re: 1994 Chevy S-10 Looking for a jesus... a jesus of car to help save this one
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Circuit Description
The PCM applies a bias voltage of approximately 450 millivolts (350-550 mV is normal bias voltage) between terminals "A10" and "A12". The Heated Oxygen Sensor (HO2S) varies the voltage within a range of about 1 volt if the exhaust is rich, and down to about .010 volt if exhaust is lean. DTC 13 is set when the voltage does not vary on CKT 412 within a predetermined amount of time.
The sensor is like an open circuit and produces no voltage when it is below 315°C (600°F). An open sensor circuit, or a cold sensor causes "Open Loop" operation.
DTC 13 Will Set When
- Engine has been running longer than 2 minutes.
- Engine Coolant Temperature (ECT) greater than 70°C (158°F).
- Throttle Position (TP) signal has been above 5%.
- All conditions must be met for about 60 seconds.
- O2 signal voltage steady between .35 and .55 volt.
If the conditions for a DTC 13 exist, the system will not go into "Closed Loop."
Action Taken (PCM will default to)
The Malfunction Indicator Lamp (MIL) will illuminate and system will go into "Open Loop."
DTC 13 Will Clear When
Conditions for fault are no longer present and Tech 1 "Clear DTCs" function is used or 50 ignition switch key cycles have passed with no further faults or ignition switch is turned "OFF" and fuse #9 (ECM B) fuse is removed for 10 seconds.
DTC Chart Test Description
Number(s) below refer to circled number(s) on the diagnostic chart.
- This step checks to see if DTC 13 is the result of a hard failure or an intermittent condition.
- This test checks the oxygen sensor's heating element. The heating element resistance should be 3.5 ohms at 20°C (68°F) or 14 ohms at 350°C (662°F).
- This will determine if the sensor is at fault.
- For this test use only a high impedance Digital Volt Ohmmeter (DVM) J 39200. This test checks the continuity of CKT 412 and CKT 413. If CKT 413 is open, the voltage on CKT 412 will be over .6 volt (600 mV).
- If the fuse was open, check the wiring diagram for complete wiring circuit.
Diagnostic Aids
If the oxygen sensor heaters are not operating properly, system may go into "Open Loop" after extended idle.
Normal Tech 1 scan tool voltage varies between 100 mV to 1000 mV (.1 and 1.0 volt), while in "Closed Loop." DTC 13 sets in one minute if voltage remains between .35 and .55 volt, however the system will go "Open Loop" in about 15 seconds.
An oxygen supply inside the O2S is necessary for proper O2S operation.
This supply of oxygen is supplied through the O2S wires. All O2S wires
and connections should be inspected for breaks or contamination that
could prevent reference signal from reaching the O2S.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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