1991 S10 Pickup Truck Won't Start--Help? - S-10 Forum
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1991 S10 Pickup Truck Won't Start--Help?

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Old 05-12-2011, 02:12 AM   #1
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1991 S10 Pickup Truck Won't Start--Help?

I have a 1991 S10 Pickup, 2 wheel drive with a 2.5 liter 4 tech engine. Truck ran great for a month then it sat for 4 days and I went to start it and later discovered there was no fuel shooting from the injector. I replaced the ignition module and got fuel spraying again. I have fire to all 4 plugs and put on a new rotor button as well. The truck will begin to run so long as I am spinning over the ignition, then it dies when I let off of the key, sometimes with a pop out of the throttle body. Any Ideas? It will not run.
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Old 05-12-2011, 02:23 AM   #2
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Re: 1991 S10 Pickup Truck Won't Start--Help?

try some starting fluid if it will run off the starting fluid then most likley you have a fuel problem.
Old 05-12-2011, 02:32 AM   #3
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Re: 1991 S10 Pickup Truck Won't Start--Help?

Quote: Originally Posted by n2deep22
try some starting fluid if it will run off the starting fluid then most likley you have a fuel problem.
The engine will sputter for a few seconds if I pour gas in the throttle body, it will sputter for a few seconds if I don't, it will rev high for a few seconds if I hold good pressure to the pedal and spin the key long enough. It always dies immediately when I let off the key.
Old 05-12-2011, 03:11 AM   #4
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Re: 1991 S10 Pickup Truck Won't Start--Help?

details details,,, pfft.... So two days before I parked it I went through some high water and the truck stalled, yessir it did. I pulled the passenger side front tire, popped the distributor cap, dried it as good as I could and then put a high speed fan with a heater behind it blowing up onto the distributor overnight. The truck was reluctant to start the next morning, but it did. So then I drove it 100 miles and parked it, then it wouldn't start today as described in my first post. Anybody think I oughta replace the coil pack in the distributor as well?
Old 05-12-2011, 06:27 AM   #5
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Re: 1991 S10 Pickup Truck Won't Start--Help?

if spark is white then no

make sure 12 volts good to the FP wire

make sure FP pressure is up also

bad cap and rotor and module pretty much rules out ignition issue on the TBI engines as the cause of no stasrt or run

a stuck EGR valve will cause difficult start and stumble stall



unplug it and beat on it with something metal real quick a few times to seat it, and then see what happens

if still not good then check FP voltage and pressure

is timing set correctly/

needs to be set to 0 with the ESC module unplugged
Old 05-12-2011, 11:24 AM   #6
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Re: 1991 S10 Pickup Truck Won't Start--Help?

Quote: Originally Posted by fast68chevy
if spark is white then no

make sure 12 volts good to the FP wire

make sure FP pressure is up also

bad cap and rotor and module pretty much rules out ignition issue on the TBI engines as the cause of no stasrt or run

a stuck EGR valve will cause difficult start and stumble stall



unplug it and beat on it with something metal real quick a few times to seat it, and then see what happens

if still not good then check FP voltage and pressure

is timing set correctly/

needs to be set to 0 with the ESC module unplugged
Spark is Orange, what now?
Old 05-13-2011, 11:25 PM   #7
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Re: 1991 S10 Pickup Truck Won't Start--Help?

Quote: Originally Posted by fast68chevy
if spark is white then no

make sure 12 volts good to the FP wire

make sure FP pressure is up also

bad cap and rotor and module pretty much rules out ignition issue on the TBI engines as the cause of no stasrt or run

a stuck EGR valve will cause difficult start and stumble stall



unplug it and beat on it with something metal real quick a few times to seat it, and then see what happens

if still not good then check FP voltage and pressure

is timing set correctly/

needs to be set to 0 with the ESC module unplugged
Set to 8* with A/B terminal on ALDL jumpered.........

Orange spark, suspect a shorted winding in the coil.
Old 05-16-2011, 05:31 PM   #8
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Re: 1991 S10 Pickup Truck Won't Start--Help?

What do you mean by white or orange spark? How would you check this?
Old 05-17-2011, 01:06 AM   #9
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Re: 1991 S10 Pickup Truck Won't Start--Help?

Quote: Originally Posted by Savageoz
What do you mean by white or orange spark? How would you check this?
Use a spare spark plug or pull one out of the head, leave it sitting on the block or something grounded.

The spark will be either whitish in color or will be orange in color. Orange is weak, white is good. Same thing for a BBQ grill also, nice hot white spark ignites the fuel well, a dull orange low voltage spark doesnt work well, or at all........
Old 01-27-2014, 04:22 AM   #10
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Re: 1991 S10 Pickup Truck Won't Start--Help?

The motor will sputter for a couple of seconds when I spill gas in the throttle figure, it will sputter for a couple of seconds assuming that I don't, it will rev high for a couple of seconds when I hold great weight to the pedal and rotation the key long enough.
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