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Old 02-19-2011, 03:27 PM
Jakeman Jakeman is offline
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Default 1991 4.3 EFI Wont Start

Got a 91 S-10 4.3 EFI 4x4 given to me a couple of weeks ago (147,000 miles). It sat alot over past 2 yrs. It started right up, I have changed oil, belt, fuel filter, air cleaner and a few other things. It has started every time and runs well until today. It turns over fine, but does not appear to be getting fuel or spark. Any ideas as to what to check first. Is there a common electronic ignition control module of some sort that goes bad on these? Any help would be greatly appreciated.
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Old 02-19-2011, 06:42 PM
Jakeman Jakeman is offline
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Here's additional information. There is No Spark. If there is no spark, is there something in the fuel injection system that keeps fuel out of the carb, because it appears dry.
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Old 02-19-2011, 06:46 PM
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Ignition control module controls the pulsation of the fuel injectors and the spark to the plugs. It could definately be the problem. It's under the distributor cap.
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Sounds like you messed something up.
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Last edited by 88Jimmy; 02-19-2011 at 10:26 PM. Reason: "spark" not "spart"
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Old 02-19-2011, 09:49 PM
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Quote:
Originally Posted by 88Jimmy View Post
Ignition control module controls the pulsation of the fuel injectors and the spark to the plugs. It could definately be the problem. It's under the distributor cap.
x2 on that idea.. for once i agree with Josh on the ICM
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Last edited by 88Jimmy; 02-19-2011 at 10:27 PM. Reason: "spark" not "spart"
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Old 02-20-2011, 01:15 PM
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92typhoon937 92typhoon937 is offline
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if the injector in the tbi isnt firing it could be fuel pump or check the ecm b fuse as that controls the fuel pump
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Old 02-22-2011, 06:04 PM
Jakeman Jakeman is offline
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Thanks for the info. I had the Ignition Control Module tested and told it was good, but the Coil tested Bad. Replaced Coil. Same result. No Spark or Fuel. I verified that power is getting to Coil and power is getting out to the Ignition Control Module so bought a new Ignition Control Module and will install tonight. I am hoping the person at NAPA was wrong about the Ignition Control Module. I also verified that the fuel pump is kicking on with the ignition, and I have fuel to the carb, just not being injected.

If the new Ignition Control Module doesn't solve the problem, any additional recommendations as to what to check next
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Old 02-22-2011, 06:54 PM
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the pick up coil in the dis.
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Old 02-22-2011, 07:37 PM
tetsau tetsau is offline
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No spark, No fire. That means no reference pulse from the ignition module. Pick up coil maybe. Check it with an ohm meter. Should be 500 to 1500 ohms. Usually around 800 or so. Never trust A module checker at the parts store. Very unreliable. Thats not opinion, It's experiance. Only 3 things cause no spark, No fire. Pick up coil, Ignition module, And rarely ECM. 9 times out of 10 it would be the module in my experiances. But do an ohms check on the pick up coil first. If it's not in the 500-1500 range it is bad. Process of elimation will save you money. I've seen way too many people throw thier away by guessing. If you want the module tested call you'r local dealer and ask if they have A
j24642 module tester. They probably won't know what you'r talking about. Too easy to go to parts and get A known good part and try that first. We don't have that option so good luck. I do have some voltage checks you can do, But kinda long to post.
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Old 02-22-2011, 08:23 PM
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make sure the wires at the injector are connected inside the plug..
(for a non fuel only issue) sounds retarded but iv been down that road before
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  #10  
Old 02-22-2011, 11:17 PM
Jakeman Jakeman is offline
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Well the new ignition control module did not solve my problem. Now I have a new coil and a new ignition control module, but I still have no spark and no fuel being injected (I do have fuel to the carb). Both of these problems happened Simultaneously. One Saturday the truck ran, the following Saturday it did not, and it sat in a dry shop all week.

Anyway, I have two questions, (1) would the Pick Up Coil keep the injectors from introducing fuel to the carb, and (2) Being that the truck sat outdoors for a couple years with only being run a few times a year, would excessive moisture in the cab of the truck afffect the ECM?

Again, I have power to the coil and from the coil to the ignition control module. Thanks again for the advice.
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