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Give me Fuel, Give me Fire!

Old 04-11-2019, 01:22 AM
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Default Give me Fuel, Give me Fire!

GM Forum, I'm seeking what steps need to be taken to bring the spark back into my car? +200k on a 2000 grand prix gt L36 coupe. Started stalling which led to slow starts now at no start . Engine turns , plenty of fuel with pressure. New Acdelco 41-101. New ICM. All that is now. Some history is Car always ran smooth strong and steady. Even though after its next to last stall about 3-4eeeks I pulled 3 AP606 plugs from rad side of motor gapped .090, and 3 AC 41-921 from firewall side gap .09-.10 (with bridging), way over.10too maybe .120 with electrode tip intact but arc bridging removed.with new plugs it started right up and final stall to date about 4 minutes after start. About a week later, last week confirmed dead ICM,(when, why? idk!) But a brand new, tested b4 install now in. No spark to any plugs and get any off of the coil. does engine run smooth rule out crank sensor, MAF, or coil packs? Does this point to Ign switch as guilty? I never activated security. Dont have fob or remote lock. Can the key transponder burn out? I only have one. Or what am I not doing right ? There it is. Please, when I check back here tomorrow give me something I can use to be driving through the drive-thru tomorrow not having to hope our dinners ready before the car stops. I'll repost results of any attempted ideas. Call me Guinea because something has to work! Thank you 🐾🐾
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Old 04-11-2019, 09:37 AM
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How about some actual numbers. What is the fuel pressure?
How did you confirm ICM was bad? Even with a scope it is a crap shoot at times. What did the connectors look like? Nice and clean?
Does the anti-theft light come on at KOEO? Does it go out after a few seconds?
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Old 04-11-2019, 08:09 PM
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Let'* just say it is what it is. I felt this post was long enough without having to ad implied info such as the old and new ICM was tested at parts store. After finding complete no spark as a opposed to partial or weak spark which would be indicative of a different path of troubleshooting. See, too lengthy with unusable detail. I'm sure some readings would not have showed good due to the condition of the spark plugs but I don't have those details. But takeoff good, acceleration good, hiway city, 24mpg combined(and I have a heavy foot), even after stalling began, don't show signs of needing diagnostic testing. See again TMI. I hope that answers your question. If information is intended to further troubleshooting, please be specific so I may supply the information necessary as best as possible.Thank you
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Old 04-11-2019, 08:45 PM
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carfixer007: regarding the dash mount security light. With key in off position only opening driver door(did not check passenger door or trunk or hood) causes stock security light to flash continuously. Until key is switched to on or acc with door open. Or shutting door will stop it from flashing. I have not used any security with vehicle, have not had problems related to it, only recently changed components (ICM) that are involved with programming. AKA I have limited to no knowledge in this area. Thank you
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Old 04-12-2019, 07:53 PM
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Gimme fuel, gimme fire? Sounds like a Metallica song.
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Old 04-13-2019, 01:31 PM
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Default Car talk

The last song I heard before posting my question was Metallica'* Fuel via car fm audio. Seemed an appropriate and related forum title! although I know I'm not getting fire to spark plugs, is my car trying to tell me something more than I'm thinking, what could get it to fire up? Now here'* a question If I've wore the battery down with a few drain and recharge cycles recently is it possible that engine will crank but battery not strong enough to supply proper voltage to fuel the spark to start the car? I had easy over hr of crank no start time about 2 months ago, now over 5 mins total crank time and I'm recharging battery, If I leave some charge in it, same volts are there tomorrow. So yeah, Metallica~Fuel from reload released 97? Pontiac released 2000! So, quench my thirst with gasoline=fuel, fire, desire? A friend has a good battery not in use, I should know in a day or two. Unless someone knows a way to hook a top mount battery into a side mount car without another trip to the parts store?
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Old 04-13-2019, 03:50 PM
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You should monitor the battery voltage while cranking the engine. The volts should not drop below 10.5 Volts. If the voltage drops below that level it may not be high enough to fire up the computer system which is needed for a proper start.
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Old Today, 12:40 AM
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It stalls at idle sometimes, right?

How many miles are on it? There are a lot of numbers that are higher than 200,000.

What is the fuel pressure?

What part of the world does it live in?

Have you checked the IAC?
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