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Old December 20th, 2011, 10:20 AM   #1
greygoose
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Default 1997 blazer 4.3 cuts out

Alright guys,

My father-in-law has a 1997 blazer that has recently started cutting out on him. The other day while leaving my house it randomly shut off while he was backing out of my driveway. As soon as he put it in neutral and turned the key it fired right back up and he proceeded to drive 70 miles home without an issue. However, yesterday while he was driving on the freeway he told me that it felt like it was cutting in and out again even though it didnít actually stall out this time.

Here are some of the things that have been done to this vehicle in the past two years.

New plugs
New wires
New cap / rotor
New fuel filter
Fuel injectors cleaned

He has owned this vehicle since it was new and it currently has 125,000 miles on it. The past few years this vehicle has only been used in the winter but he makes sure to use fuel stabilizer when he stores it for the summer.

Any help would be much appreciated.
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Old December 20th, 2011, 10:26 AM   #2
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Could be a pump issue, but not one I've heard of before.
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Old December 20th, 2011, 11:10 AM   #3
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Quote:
Originally Posted by Freak View Post
Could be a pump issue, but not one I've heard of before.
I thought that myself at one point, but since it starts right back up every time I didn't think that was it.
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Old December 21st, 2011, 08:27 AM   #4
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Bump.

Anyone else have some ideas?
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Old December 21st, 2011, 08:30 AM   #5
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Distributor gear. Those are notorious for the gear on the bottom of the distributor to wear out. It will throw the timing off and cause it to hesitate, misfire, runs sluggish and idle rough. Thats my first guess without looking at it or knowing anything else about it. If you have any other questions feel free to send me a PM and I may be able to help.
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Old December 21st, 2011, 10:17 AM   #6
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I would check fuel pressure first.It should have 61-66 lbs iirc.usually when the pump is going out they dont start,or run bad under a load.I would also get a gasket for the egr valve,and check it for a chunk of carbon holding it open.
If you dont find your problem,check your distributor gear for wear,as someone mentioned.
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Old December 21st, 2011, 10:36 AM   #7
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Hmmm, ok. I will look into both.

Thanks!
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Old December 22nd, 2011, 03:08 AM   #8
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Fuel pump most likely. My old blazer would just bog down randomly from time to time, new fuel pump fixed it. The old pump was only 5 psi low and it caused the problem. it doesnt take much!
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