Mechanics

OOPS.. DID I FRY COMPUTER?

1993 Saturn SL2

Electrical problem
1993 Saturn SL2 4 cyl Two Wheel Drive Manual 233000 miles

I was hooking up my positive battery cable (I know, I should have not had the negative hooked up too). I pulled the wrench down too far and sparks flew. When I tried to start the car the starter just kinda growled and all the dash lights went crazy. Even the fan kinda turned on even thought it wasn't on. Seems like I must fried the computer but wanted to check if it could be anything else or if I could do some test before I get one from a junkyard. Thanks so much for the help!
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Zatrony
January 18, 2010.




Doesnt sound like ur computer the starter doesnt go thru ur computer. The yellow wire terminal d on ur ignition switch feeds power thru ur clutch switch to ur underhood fuse box ign3 fuse to ur starter solindo. Sounds more like u have a blown fuse burned wire loose or corroded battery terminals bad battery bad starter. Lets start from the begining why where u taking ur battery cables off to start with?

Saturntech9
Jan 19, 2010.
Thanks so much for your response! So after I posted that, I unhooked the battery for a while and I could finally get it to turn over and it seemed like all the accessories were working normally again. However, it would only run if I would give it gas through the pedal. As soon as I let the pedal off it would die. I had unplugged the battery originally to clean the posts, even though things were fine. No troubles before I arced it
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Tiny
Zatrony
Jan 19, 2010.
I would say u probably have a bad coolant temp sensor but u said u didn't have a problem before the arch deal.U should have it scanned for codes let me know what u find.

Saturntech9
Jan 19, 2010.
Thank you. I did scan it and it only showed code 12 which means its in diagnostic mode I believe. This was a relief though as it seems then that computer is not fried. I did change the coolant sensor a while back. Could they crazy stuff I described at first with the flashing dash lights and starter cutting out be a bad battery ground? I was searching around for melted/burned wires and found both battery grounds to be quite corroded so I cleaned those up. Now starts quite good but still the idling issue.

Can a bad alternator due this. I read somewhere that a fried alternator could cause idling issues. I could have burned that baby up when I made my major boo boo

Tiny
Zatrony
Jan 19, 2010.
Yes a bad alternator could cause alot of differnt problems but how bad did ur arch the battery?If u have a voltmeter u can hook up to the battery and turn the a/c blower on high high beams on while it's running and see what voltage the alternator is putting out?How long ago did u replace the coolant temp sensor it's pretty common for them to go bad there under 20. So the car runs great except at idle?How does it run at idle?

Saturntech9
Jan 20, 2010.

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