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94 Gmc sierra. my post must have made me sound like a know it all.


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truman252
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Feb 20, 2012, 11:44 PM

Post #1 of 14 (1447 views)
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 Mad my truck is a 94 GMC sierra ext. Cab 4x4 350. I was driving at 45 MPH and the engine died as if I had cut off the ignition. I checked the basic three air, fuel and spark.I'm lacking spark. I checked the throttle body & injectors & added a small dash of fuel. There was no attempt to start when I turned it over.the ignition system has an external induction coil with a power supply coming from the wireing harness & two wires going to the base of the distributor & the coil wire to the distributor cap. The distributior has a group of wires coming in from the harness & two wires out to the coil. The coil has power but the engine wont try to start when turned over....ithasremote lock


My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.

(This post was edited by truman252 on Feb 21, 2012, 4:16 AM)


Hammer Time
Ultimate Carjunky / Moderator
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Feb 21, 2012, 6:07 AM

Post #2 of 14 (1386 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

Test for injector pulse using a noid light.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truman252
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Feb 21, 2012, 9:37 PM

Post #3 of 14 (1345 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

Thank you for your reply. I have read most of the post and see that you are a very knowledgable technition.I won't be arguing with you, but following your advice. I got a good laugh at the tbi vortex conversation.
I used a noid light and both tbi injectors have a pulse. I can see the spray with my eye as well. I removed the coil wire from the coil side and get no fire from the coil. Im pretty sure of it being the ignition system but I'm unfamiliar with this ignition design. Anything you can tell me to try I will do to the letter.thank you for your help. I forgot to mention in my post it is a high millage tricycle 250,000 . But it was a strong running truck that has had no problems in the last three years.that's why I bought it.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


truman252
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Feb 21, 2012, 9:44 PM

Post #4 of 14 (1338 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

I also attempted to scan for codes but the only scanner available was not compatible.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Hammer Time
Ultimate Carjunky / Moderator
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Feb 21, 2012, 9:45 PM

Post #5 of 14 (1337 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

OK good. We just proved that the ECM is receiving a reference signal so the crank sensor is good and the problem is isolated to ignition. You probably will have it but test for power arriving at the + side of the coil with the key on at the pink wire. If you verify power, my best guess would be a bad ignition module inside the distributor.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truman252
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Feb 21, 2012, 10:24 PM

Post #6 of 14 (1333 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

That's good news. I have tested it and it does have power. I will replace the ignition module and see if that fixes the problem. Againe thanks for sharing your knowledge.
This truck has horrible paint & is riddled with bullet holes, but it's still strong and tight with a lot of character. Worth every penny of the two grand I paid for it. It has a good home with me.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Hammer Time
Ultimate Carjunky / Moderator
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Feb 21, 2012, 10:27 PM

Post #7 of 14 (1331 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

I won't ask where the bullet holes came from............LOL
Let us know what happens




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



truman252
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Feb 21, 2012, 10:32 PM

Post #8 of 14 (1325 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

Thanks I will.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


truman252
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Feb 23, 2012, 1:00 AM

Post #9 of 14 (1297 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

I didn't have time to install them but bought the parts.
Ignition control module, rotor cap, plugs /copper, & wires.. I will try to install tomorrow & let you know what happenes.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


truman252
User

Feb 23, 2012, 7:17 PM

Post #10 of 14 (1282 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

Your diagnosis was correct. I replaced the ignition control module, and it fired right up. Smooth idle with no misses. Thank you very much for your time and help with the problem.
this is a great site and thanks to all the techs.that volenteer your time and knowledge to help inexperienced technitions further their knowledge. /special thanks to hammer time for his no non-sense replys to some silly posters.



My auto repair background is many years as family shade tree.& 500hrs in auto technology in engine performance specialization. Certificate received. I am not a tech & not qualified to give advice.


Hammer Time
Ultimate Carjunky / Moderator
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Feb 23, 2012, 7:20 PM

Post #11 of 14 (1279 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

That's great, You see, that is how it's supposed to work when people just listen and follow instructions. Right to the problem with minimal back and forth. Glad it worked out for you.




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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.



nickwarner
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Feb 23, 2012, 9:52 PM

Post #12 of 14 (1258 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

Yet another confirmed fix for the Hammer!


Discretesignals
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Feb 23, 2012, 10:03 PM

Post #13 of 14 (1252 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

Congrats Smile





Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.


re-tired
Veteran / Moderator
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Feb 23, 2012, 10:28 PM

Post #14 of 14 (1245 views)
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Re: 94 Gmc sierra. my post must have made me sound like a know it all. [In reply to] Sign In

Geez , now he has to go and buy a bigger hat. LOLOL Just Kidding Good posts , ran out of stars.

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