- #1866 of 2018
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Re: Need help with my 1993 S15 Sonoma 2.5L [regnarg]
by regnarg
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Aug 04, 2006 (4:05 pm)
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Replying to: regnarg (Aug 03, 2006 1:00 pm)
I originally got my truck scanned and codes for "lean exhaust" and "O2 sensor curciut open" came up, however that was before I replaced the exhaust manifold and O2 sensor. It cost me $120 for GMC to tell me that, so I havn't been really keen on going back. Does anyone have a list of sensors that a 1993 sonoma would have? The truck runs fine when the sevice engine soon light comes on, so I am rather sure it is just a sensor.
Thanks
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- #1867 of 2018
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Re: Need help with my 1993 S15 Sonoma 2.5L [regnarg]
by hoodlatch
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Aug 04, 2006 (7:50 pm)
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Replying to: regnarg (Aug 04, 2006 4:05 pm)
If you feel you have fixed the problem and you just want to clear the service engine light' you might try this procedure. Disconnect the battery, turn lights on or put your foot on the brake pedal for a few seconds. Then reconnect the battery. It should clear the ECM if the discrepancy has been satisfied. Of course you'll have to reset your radio and clock. However, if the initial problem isn't resolved then the light will persist. Actually, if the problem has been resolved the light is supposed to clear itself. To obtain the code yourself isn't complicated. As Mr. Canufixit stated, the chain parts stores are glad to give a crash course of instruction. As we all know, it gets real expensive to start replacing sensors wholesale in hopes of getting lucky. I bought a test plug that fits my 92 S-10 for about $25. But actually I can do the same thing with a small jumper wire that doesn't cost anything. All this and the code definitions are listed in a Haynes manual. I'm not really keen on Haynes but they are plentiful & easy to obtain.
Good luck and keep us posted on what you find out.
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- #1868 of 2018
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Re: 91 Sonoma - Mystery Box [dstang]
by hoodlatch
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Aug 06, 2006 (10:58 am)
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Replying to: dstang (Aug 04, 2006 11:41 am)
I have the same thing on a 92 S-10 2WD. As I understand it, the box you described has something to do with the anti-lock brakes. Only on this make the anti-lock is for the rear wheels. Last year I had to replace the ABS Modulator Valve. Its function is to evenly distribute the pressure between front and back brakes.
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- #1869 of 2018
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My Coolant Issue....
by the_big_al
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Jun 27, 2008 (3:16 pm)
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This is just an update on my ongoing coolant issue. It appears that I have solved the problem. Thanks to all who helped my avoid a shop and costing me big $$$  .
I have been running the truck around for a couple of days and all seems to be in order. The temp heats up more quickly than I remember, but that could be because I am keeping closer watch on the temp than I do the speedo. But once it reaches 210 (midway) it stays put. The heater works fine as does the A/C. The truck also starts normally and seems to run fine. So hopefully, even though I did run it hot for a couple miles I got lucky and no permanent damage was done...
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- #1870 of 2018
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Re: My Coolant Issue.... [thebigal]
by canufixit
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Aug 07, 2006 (4:29 am)
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Replying to: the_big_al (Jun 27, 2008 3:16 pm)
Congrats thebigal!! I just love it when a plan pulls together !!!
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- #1871 of 2018
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Re: Need help with my 1993 S15 Sonoma 2.5L [hoodlatch]
by regnarg
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Aug 08, 2006 (8:50 pm)
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Replying to: hoodlatch (Aug 04, 2006 7:50 pm)
Still having a few problems with my truck, service engine light coming on, hesitation, etc.. Will be changing the EGR valve tomorrow, I have been told that they can gum up and stick open or shut. Also makes sense as far as the codes for O2 sensor, and lean exhaust that I have been getting. This will be strike 4, 1-O2 sensor, 2-cracked exhaust manifold, 3-MAP sensor, 4-EGR Valve.
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- #1872 of 2018
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Re: Need help with my 1993 S15 Sonoma 2.5L [regnarg]
by hoodlatch
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Aug 09, 2006 (7:09 pm)
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Replying to: regnarg (Aug 08, 2006 8:50 pm)
I've read on other post where the EGR has given a lot of trouble by sticking on the S-10's & S-15's. I would think a bad MAP or EGR would have a tendency to cause them to run rich instead of lean. Your order of sequence for troubleshooting sounds solid. I too would inspect the EGR next to make sure it’s opening and closing like it should. On random my S-10, 4.3 acts up on start up. It doesn't do it all the time. I'm wondering if it doesn't have something to do with the EGR. I had a MAP sensor go out on a four banger ford one time. The code it was giving was lying to me. While trouble shooting I filled my garage up with soot and carbon monoxide. That led to an unpleasant experience for me. Since then I've regarded trouble codes as a ballpark figure and not the gospel.
Good luck and happy hunting. 
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- #1873 of 2018
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Re: Need help with my 1993 S15 Sonoma 2.5L [hoodlatch]
by jpf
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Aug 09, 2006 (8:32 pm)
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Replying to: hoodlatch (Aug 09, 2006 7:09 pm)
I am surprised you are having this many problems with the 2.5L engine. I had that engine in an 89 Celebrity and 91 Olds Ciera Wagon, both were quite durable. I had the O2 sensor go on the Celebrity and the same manifold problem happen to the Ciera. I sold the Ciera to my brother-in-law 6 years ago. He was still driving it up until last year until some one rear ended him. The car was a write off. Getting back to your problem, have you had your catalytic converter checked out? A bad converter could cause your engine light to come on. Good luck.
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- #1874 of 2018
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Re: Need help with my 1993 S15 Sonoma 2.5L [regnarg]
by regnarg
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Aug 10, 2006 (3:27 pm)
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Replying to: regnarg (Aug 08, 2006 8:50 pm)
I got my EGR (EXHAUST/GAS RECIRCULATION) valve off of my truck finally. If anyone needs to do this themselves you will need a 13mm crowfoot socket, or the carborator will have to come off. The old one sounds like a salt shaker, just full of black exhaust build-up. I am rather sure now that I have finally found the real problem.
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- #1875 of 2018
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Re: Need help with my 1993 S15 Sonoma 2.5L [regnarg]
by hoodlatch
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Aug 12, 2006 (9:28 pm)
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Replying to: regnarg (Aug 10, 2006 3:27 pm)
Congratulations, and thanks for the tip in the 13mm crows foot. Keep us posted on the out-come.
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