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Chevrolet Blazer Engine and Performance Problems

173 messages,  Last post on May 17, 2013 at 5:35 PM

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What is this discussion about? Chevrolet Blazer, SUV

Messages Page 16 of 18

#149 of 173 2000 chevy blazer stalling by fireman14

Mar 28, 2010 (6:45 am)

On take off and normal driving my blazer seems to stall or sputter then runs fine again. I have replaced the distributor cap, rotor button, plug wires, plugs, egr valve, fuel filter, and the mass air flow sensor. The only thing that has helped was the mass air flow but after driving a few days it starts acting up again. I have already replaced it again with same problem. Any help would be greatly appreciated. Thanks

#151 of 173 Re: 2000 chevy blazer stalling [fireman14] by coolin

Apr 27, 2010 (11:01 am)

Replying to: fireman14 (Mar 28, 2010 6:45 am)
My 98 Blazer does the same thing as yours. It's been running like this for 8 months. This moring, on my way to work, it sputter so hard I thought it was going to stall.
 
It's to the point were I won't dart in front of traffic unless I have plenty of room. This way I won't interrupt the flow of traffic and get rear ending. I never know when it will sputter.
 
I took it to a good repair shop and they cleaned off a sensor and it helped for a week, then it went back to the stalling/sputtering. I hope whatever the problem is it will be a cheap fix. I just spent $800 fixing something elese. I did not mention the stalling, I was still in shock from the $800 problem.

#152 of 173 91 4.3l intermittent, suddenly dies at any speed by rfletcher

Jul 04, 2010 (9:27 am)

1991 S10 Blazer 4X4 4.3 L 187000 mi. Truck in excellent condition, used every day and normally runs very well. Intermittently, the engine dies, at any speed, without warning.. Will restart but may or may not stall again within a few minutes. May be heat related. After it sits for several hours, will operate perfectly for weeks or months. Problem started last fall. Replaced ignition control module, Dist. Cap, Rotor, Plugs etc. Replaced both temp. sensors . and oil pressure sensor. Fuel pressure was and still is normal.[ Had a qualified mech. check it again this week.] After all the "Easter Egging" last fall, did not fail again until March then again in April but ran perfectly until last week. Truck was in shop all day, with three mechs. driving and testing.. Can find nothing wrong.. No codes. Normal driving conditions are short trips with frequent stops. Has never failed . Each incident was on an 80 mile round trip. Forty miles over, no problem and sits for two hours. Forty miles back and has stalled up to six times at 65mph and / or in heavy traffic at very low speed. Will restart, usually very easy but occasionally, all but kills the battery.
 
It's driving me NUTS and not doing my pocket any favors either.
 
Thanks for any suggestions

#153 of 173 Re: 91 4.3l intermittent, suddenly dies at any speed [rfletcher] by duntov

Jul 04, 2010 (1:04 pm)

Replying to: rfletcher (Jul 04, 2010 9:27 am)
I think I may have covered this one before. Anyway, you should always use a conductive lube or paste on the ICM head sink in the distributor. Do not use dielectric grease or silicone greease such as SIL Glide. Dielectrice lube is a insulator. Always replace the two ICM moumnting screws also. They ground the ICM and can corrode due to moisture and electrolysis. Unfortunately, the monting screws are a dealer item, part no. 10469668. The heat sink paste is Arctic Silver 5. and can be purchased as any computer electronics store.
 
The ICM is sensitive to heat and ground and will intermittenly fail when the heat is excessive there high resistance to ground. .

#154 of 173 Re: 91 4.3l intermittent, suddenly dies at any speed [rfletcher] by jlflemmons

Jul 04, 2010 (8:01 pm)

Replying to: rfletcher (Jul 04, 2010 9:27 am)
Try applying a heat gun to the crankshaft position sensor. These will only set a code if the failure occurs three times without cycling the ignition. If weak, they tend to fail when hot, and at higher rpm. The unit is what's called a Hall Effect sensor. Reads the magnetic pulse from the crankshaft and will kill the engine if it doesn't "see" the pulse.

#155 of 173 Re: 91 4.3l intermittent, suddenly dies at any speed [duntov] by rfletcher

Jul 05, 2010 (4:53 am)

Replying to: duntov (Jul 04, 2010 1:04 pm)
Thanks, I will certainly do as you suggest. I think a paste came with the new ICM but have no idea what it was. I had a gut feeling that it was heat related but not in this way.

#156 of 173 Re: 91 4.3l intermittent, suddenly dies at any speed [jlflemmons] by rfletcher

Jul 05, 2010 (5:01 am)

Replying to: jlflemmons (Jul 04, 2010 8:01 pm)
Thanks for the help. I will check that too. Has never set a code but then the OBD1 dosn't read a lot. Seems the guys in the shop here lack your experience.

#157 of 173 Re: 91 4.3l intermittent, suddenly dies at any speed [duntov] by rfletcher

Jul 06, 2010 (2:13 pm)

Replying to: duntov (Jul 04, 2010 1:04 pm)
As you suggested, I pulled the ICM, cleaned all surfaces, and reinstalled it with the only silver product I could find. Holiday weekend. Today, in the very fine print I noticed this product, while claimed to be 99.9% pure silver and made for high power heat sinks, is not electrically conductive. Makes no sense but now I feel that I should pull it again. Your opinion.

#158 of 173 Arctic Silver 5 by duntov

Jul 06, 2010 (4:02 pm)

Arctic Silver 5 is THERMALLY CONDUCTIVE, and was designed to conduct heat, not electricity. The heat sink for the ICM is designed to conduct heat away from the module and Arctic Silver 5 enhances that conductivity.
 
New fasteners provide a good electrical ground for the ICM and should be replaced when the ICM is replaced.

Messages Page 16 of 18

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