Engine Problems
#1
03-24-2012, 10:27 AM
Engine Problems
I have a problem with my S-10 blazer and looking for some advice.
It is a 1992, 4.3 L, TBI.
After it runs for 5-10 minutes then it will shut off. I replaced the fuel tank, fuel pump, fuel filter, but it still does the same thing.
If you let it sit for 5 minutes it will start back up and do the same thing.
I replaced the fuel tank, fuel pump, fuel filter to no avail. If I take the air cleaner off and watch the injectors it is like they just shut off when you rev the engine. I am thinking that it is electrical and not fuel related at this point, but I have no idea where to even start.
It is a 1992, 4.3 L, TBI.
After it runs for 5-10 minutes then it will shut off. I replaced the fuel tank, fuel pump, fuel filter, but it still does the same thing.
If you let it sit for 5 minutes it will start back up and do the same thing.
I replaced the fuel tank, fuel pump, fuel filter to no avail. If I take the air cleaner off and watch the injectors it is like they just shut off when you rev the engine. I am thinking that it is electrical and not fuel related at this point, but I have no idea where to even start.
#2
03-24-2012, 01:39 PM
Where I would start is checking for spark immediately.
Pull the coil wire out of the dist cap and stick an old plug in it lay it on engine or any metal and look for blue spark when cranking.
If I have that, then I would check for sound of fuel pump when turning key on.
Pull the coil wire out of the dist cap and stick an old plug in it lay it on engine or any metal and look for blue spark when cranking.
If I have that, then I would check for sound of fuel pump when turning key on.
#4
03-24-2012, 03:16 PM
Wolf...
Does it seem to fire at all---just after it dies?
Try what pfog says.
Check for spark immediately after the truck dies on its own.
Can't imagine why a sensor (and there are a few) would be so irratic relating to engine ignition. CheckEngLite should pop on then.
My suggestion:
Check your electrical connections. Especially those relating to fuel. Such as those on the fuel pump relay (should be mounted on the fender) , and especially the connection on the oil sender.
Because, the fuel pump is powered from the ign switch and then from the oil pressure switch. Yes, a 'parallel' circuit.
You could have a fuel pump that quits pumping because it loses elec power. Some of these connections are a couple yrs old. They corrode. Use some contact cleaner or whatever.
Or maybe it's the ign switch. doubtful.
EDIT:
Just read Retro's post. Seems to be symptoms of ign module. Engine gets hot. Sudden engine cutoff. I did one of those too. Somewhat similar to what my truck did. Been so long ago I sorta forgot. So he might be right. I'd have Oreilly's check it. I'd guess it's the module.
Does it seem to fire at all---just after it dies?
Try what pfog says.
Check for spark immediately after the truck dies on its own.
Can't imagine why a sensor (and there are a few) would be so irratic relating to engine ignition. CheckEngLite should pop on then.
My suggestion:
Check your electrical connections. Especially those relating to fuel. Such as those on the fuel pump relay (should be mounted on the fender) , and especially the connection on the oil sender.
Because, the fuel pump is powered from the ign switch and then from the oil pressure switch. Yes, a 'parallel' circuit.
You could have a fuel pump that quits pumping because it loses elec power. Some of these connections are a couple yrs old. They corrode. Use some contact cleaner or whatever.
Or maybe it's the ign switch. doubtful.
EDIT:
Just read Retro's post. Seems to be symptoms of ign module. Engine gets hot. Sudden engine cutoff. I did one of those too. Somewhat similar to what my truck did. Been so long ago I sorta forgot. So he might be right. I'd have Oreilly's check it. I'd guess it's the module.
Last edited by SteveS; 03-24-2012 at 08:01 PM.
#5
03-24-2012, 04:35 PM
I would start looking at the ign module as well. Take it out and have the guys test it a few times. Or bite the bullet and buy one for about 40 bucks. I put a new one in mine just for peice of mine.
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