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1990 blazer,no spark,FIXED

snowdriver

snowdriver

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Driving down the road about 45mph,blazer just up and died on me abruptly,no start,towed home put in shop,plenty of fuel,no spark,also no codes stored,and will not start,what direction do I need to go,or any ideas
 
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Ignition coil, maybe pick up coil inside the distributor, I had that burn out on me a few times in the past, although the first time it burnt out, one of the ecm fuses blew.
 
Most likely ignition module. But if that was the case you wouldn't be getting any fuel from the injectors. Start with checking ECM fuses. Then I would check the ignition module, and the coil. There is a sticky in the injection section.
 
Make sure there is power going into the coil, is so, and still no fire, I'd start by replacing it, the distributor cap and rotor.
 
I'm betting it's the power wire going into the distributor cap. First check the power wire going to the distributor cap, if it has power, then it's likely your ignition module. If it doesn't have power, I'd check the entire wire from the distributor down to the fuses (and the fuses themselves). My power wire had torn one time where it went into the firewall from rubbing too much and did the same thing, just turned off down the road.
 
He is working on a 1990, remember the coil does not sit in the cap of those. The main power feeding the coil does not go to the cap.
 
thanks guys,i was leaning towards eveything you guys suggested,just wanted to be sure i was going the correct direction,,,,,,,,not sure about the flux capacitor:):):)
 
Figure out what you want to do after you get your diagnostics done. Being a constant problem (no spark), the cause will be easy to determine. Just follow the crank no run GM flow chart.

You can buy aftermarket distributors fairly cheap. Not Delco parts, but at the same time, complete and you don't have to tear yours down. A pickup coil requires you to dismantle it anyways, and IIRC, a pickup is ~$20, and the module is ~$45. Which starts to get you pretty close to a complete distributor, with no effort except to pull and reinstall.
 
Anytime I've had ice issues there was never any fuel being pumped out of the injectors. Pull the cap and make sure the rotor isn't spinning freely. Pretty common for the gear on the dist. to strip.
 
well i pulled the cap and rotor,they were in not great shape,so they need to be replaced regardless,and i removed the icm as well,going to just replace this as well,245000 miles should probably just be done,does not appear to be anything else i should replace in there,hopfully this will do the trick,will let you know,all along though when i turn it over looking for spark,fuel was being delivered?? Does that rule out the icm or not?
 
1990 blazer,no spark

Make sure you put the heat sink compound back on the icm after cleaning the distributor base. But usually if you get fuel the icm is good. Most likely a bad coil or coil power wire.
 
i had another coil that i tried,that did not do it,coil wire i have not tested yet though
 
Only other thing inside would be that little pick up coil I was talking about earlier, just a small copper coil of wire with a plug, I had a couple of those burn out and lost spark.

That requires the removal of the distributor and taking the gear off the end to get it all apart though. Not a horrible job, just a bit time consuming for the cost of the part.
 
Last time I thought I had ignition problems I went to the scrap yard and bought a whole new used distributor for 10 bucks. That's the cheapest and best way to get a delco icm IMHO.
 
I've seen more than one module fail only on the spark side and still allow a injector pulse,and vise versa,and some that would come back to life intermittently too..

I'd check the ECM fuse first,it may have popped from some other malfunction..then see if the coil is getting 12V with the key on..its not common for a coil to "die" suddenly,usually they fail gradually or only crap out when the windings overheat from an internal short ..

I agree the junkyard is the cheapest place to get another OEM distributor..however its a gamble that it'll be in working order,you never know WHY they junked the vehicle...seen more than one junked because of a cheap part gone bad that 50 bucks could have fixed!..
 
fixed,it was the ignition control module,replaced and all is well now,so we all know now that fuel can still be pumped to the injectors and still be a bad icm in certain instances
 
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