1999 Chevy S-10 No Injection Firing. No Start

Tiny
FOXKY
  • MEMBER
  • 1999 CHEVROLET S-10
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 143,000 MILES
143000 mile 1999 Chevy S10 4X4 Auto.
Father-in-Law's truck. So initial problem, and events were relayed to me.
Apparently a slight electrical whine became audible through the speaker system after hitting a "big" pothole. The truck continued about a hundred yards before dying and not restarting.
To make a long story short. All electrical systems have been checked for resistance, cam and crank sensors replaced (checked and rechecked). Pass-Lock checks out as OK. Fuel pump replaced and all wiring checked. Computer system checked.
We have fuel at the injector housing and are receiving a signal through the positive side from the computer, but apparently aren't triggering on the negative side. The injectors do not fire during cranking. Negative side has been checked from injector housing back to computer pins for resistance. OK. The injectors were replaced with a known good unit. Still no trigger signal. There IS fuel pressure to the unit. There IS fire from ignition system. However, there is a consistent "low ignition voltage" trouble-code (P0134.I think. Truck's not in my possession.).
Haven't checked against new computer yet. They have checked against a known good computer from same model truck. It's my understanding that it would need to be "flashed". What's the procedure on this?And why no trigger signal from the current unit?
Any suggestions would be very helpful, as the truck has been down for quite a while.
Thanks.
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Monday, June 2nd, 2008 AT 3:53 PM

4 Replies

Tiny
CAMLINE39
  • MEMBER
My name is Tim, and I have the same exact problem but with my 86' s-10 2.5 liter. Was just wondering if anyone has responded to your problem yet?If so, can you send me an answer to camline39@alltel. Net thanks, Tim.
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Tuesday, June 3rd, 2008 AT 4:53 PM
Tiny
FOXKY
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Repair manuals have been a good guideline. But haven't really helped. Any and all things they have pointed to have been covered.
Dealership mechanics (experienced mechanics) have offered little either. Most items they point out check out fine. PassLock. Check, fuel pump. Check, body/electrical grounds. Check, etc.
Only other info I can offer is that fuel pressure checks at 100psi to the "spider". There's just no trigger signal. Air flow sensors all check and ignition is firing in sequence. Timing chain has been changed and verified at factory specs, as have sensors for cam/crank position.
It's just a perplexing situation. Per the "book" and factory-trained mechanics this vehicle should be running.
Tim, made note of your link. Will share any info I get.
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Wednesday, June 4th, 2008 AT 3:59 PM
Tiny
RHALL77
  • MEMBER
Here is a diagram that may help you. you might also wanna check all power and grounds to the VCM. if this doesnt help let me know.


http://www.2carpros.com/forum/automotive_pictures/166241_365825_1.jpg

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Wednesday, June 4th, 2008 AT 4:16 PM
Tiny
CAMLINE39
  • MEMBER
Found my problem. My distributor has a switch in it called the hall effect switch. It reads the rpm speed from megnets and sends them to the computer which tells the injector when to pulsate. Check to see if you have this hall effect switch which is just under the rotor. Hope this helps, tim.
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Tuesday, June 10th, 2008 AT 7:26 PM

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