3S-GTE USDM Turbo Engine Help asap please car dead

shagy236 · 10-22-2009, 11:43 PM

I was racing a cobalt ss and totally beat him but right after hitting my flasher to say f@#$ you loser my car shut off(no ign.). Tried starting nothing, wiggled harness, nothing. Checked for spark, none to be found. then checked fuses and found blown EFI fuse. Replaced fuse started car, fuse blew. put test light on EFI fuse slot(no fuse) with ign. on, power to one side. turned key off still power. huh????. Thats were i am now. any ideas?

Medusa · 10-23-2009, 01:49 AM

I'm going to assume the power is only on the power side of the fuse, not the load side?

Fuses blow because of too much current, therefore you have a short somewhere after the fuse. Almost certainly a short-to-ground.

Also, the injectors are ground side switched, so the short is probably before the PCM (which is what switches the ground for the injectors). I don't have any wiring diagram, but if I did I could probably pinpoint your problem. As it is, just hope your PCM isn't fried.

I dunno why you wouldn't have spark though. Unless your dizzy went bad. If so, either the crankshaft position sensor and/or camshaft angle sensor (both housed within the distributor) are broken, and are somehow telling the PCM to do something which would cause the EFI fuse to blow.

I dunno. I'd have to look at a wiring diagram to really tell you what your problem is.

shagy236 · 10-23-2009, 09:30 PM

So after ALL DAY of wiring diagrams and power probing and everything else, Problem SOLVED. I feel soo dumb. it was the o2 grounded out on the exhaust.

Medusa · 10-23-2009, 09:55 PM

In retrospect, that's kind of funny.

Goes to show that you always want to check the easy things first - loose connections, missing pieces, etc.

I'm glad your problem was an easy fix.

10-22-2009, 11:43 PM	#1 (permalink)
shagy236 Some Skills Join Date: Oct 2009 Location: Tucson Az Posts: 77 Thanks: 0 Thanked 2 Times in 2 Posts My Google Map iTrader Rating: (0/0% )	Help asap please car dead I was racing a cobalt ss and totally beat him but right after hitting my flasher to say f@#$ you loser my car shut off(no ign.). Tried starting nothing, wiggled harness, nothing. Checked for spark, none to be found. then checked fuses and found blown EFI fuse. Replaced fuse started car, fuse blew. put test light on EFI fuse slot(no fuse) with ign. on, power to one side. turned key off still power. huh????. Thats were i am now. any ideas?

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10-23-2009, 01:49 AM	#2 (permalink)
Medusa HAY GUISE! Join Date: Sep 2008 Location: Reno, NV Posts: 752 Thanks: 9 Thanked 18 Times in 17 Posts iTrader Rating: (0/0% )	I'm going to assume the power is only on the power side of the fuse, not the load side? Fuses blow because of too much current, therefore you have a short somewhere after the fuse. Almost certainly a short-to-ground. Also, the injectors are ground side switched, so the short is probably before the PCM (which is what switches the ground for the injectors). I don't have any wiring diagram, but if I did I could probably pinpoint your problem. As it is, just hope your PCM isn't fried. I dunno why you wouldn't have spark though. Unless your dizzy went bad. If so, either the crankshaft position sensor and/or camshaft angle sensor (both housed within the distributor) are broken, and are somehow telling the PCM to do something which would cause the EFI fuse to blow. I dunno. I'd have to look at a wiring diagram to really tell you what your problem is.

10-23-2009, 09:30 PM	#3 (permalink)
shagy236 Some Skills Join Date: Oct 2009 Location: Tucson Az Posts: 77 Thanks: 0 Thanked 2 Times in 2 Posts My Google Map iTrader Rating: (0/0% )	So after ALL DAY of wiring diagrams and power probing and everything else, Problem SOLVED. I feel soo dumb. it was the o2 grounded out on the exhaust.

10-23-2009, 09:55 PM	#4 (permalink)
Medusa HAY GUISE! Join Date: Sep 2008 Location: Reno, NV Posts: 752 Thanks: 9 Thanked 18 Times in 17 Posts iTrader Rating: (0/0% )	In retrospect, that's kind of funny. Goes to show that you always want to check the easy things first - loose connections, missing pieces, etc. I'm glad your problem was an easy fix.