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Old October 24th, 2009, 05:32 PM   #1
chevotass
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96 suburban 350 stalls while driving

anybody had this issue? and how did you fix it.

its a 96 suburban with a billion miles. Its had a sputtering/hesitation during damp or rainy days since i got it. then it started doing it on sunny days.

Now yesterday while i was doing 70 down the highway it dropped from 2300 rpms to zero for half a second and then took right back off.

this morning i drove it to autozone to get it scanned. it did the same stalling thing 4-5 times in the 15 minute drive. scanned it and no codes were thrown. on the way home it seemed to stall for 4-5 seconds and would still shoot back up to 2000 rpms without me pulling over and starting again.

any ideas?
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Old October 24th, 2009, 06:04 PM   #2
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I used to drive a 96 1 ton van that did this, it turned out to be a cracked distributor cap. it also didn't throw any codes.
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Old October 24th, 2009, 06:37 PM   #3
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cool. ill check that tonight
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Old October 24th, 2009, 06:42 PM   #4
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check the distributor cap and rotor. my 99 blazer does the same thing. it goes away after driving for awhile since the heat evaporates the moisture.
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Old October 25th, 2009, 10:22 AM   #5
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cap and rotor look rough but not cracked. gonna pick new ones up and see. either way it was due for both.
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Old October 25th, 2009, 01:40 PM   #6
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check for play in the dist too. I had to get a new one a few months ago. Mine moved up and down a lot. pulled it, and the bearings on the dist were shot.
Not a bad deal though, got a new one with a new cap and rotor and cam sensor for less than $200.
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Old October 25th, 2009, 02:07 PM   #7
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Could have a short in the spider fuel injection assy. My old truck did that, I took off the upper intake and took it out and put it back in because I couldn't see anything wrong with it and it has worked fine since, it is my brothers truck now.
All I did was unplug it and plug it back in.
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Old October 26th, 2009, 02:51 PM   #8
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well the easy fix of cap and rotor didnt work. on to the next one
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Old October 26th, 2009, 03:37 PM   #9
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try and pull the front O2 sensors out and then drive it to see if there is a change. I replaced lots of plugged cat's back in my dealer days. also if you have a fuel preasure gauge check the preasure it should be 58-62 to start and 48-55 when driving
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Old October 26th, 2009, 10:14 PM   #10
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when i was driving today. the motor cut out. and i coasted to the shoulder and could hear the motor dieseling like when you have a motor not timed right and turn it off. it must have done it for 10-15 seconds before i killed it and tried restarting it. it cranked and cranked then started dieseling again. i put it to the floor and all of a sudden the truck launched and took off again. so is it electronic timing issue or fuel issue.. hhmmm
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Old October 26th, 2009, 10:43 PM   #11
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water in the gas? check the fuel pressure, replace inline filter, and add a bottle of heet. possibly check the engine block ground straps and the one on the fender by the battery are tight also.

I had a similar problem with my 99 OBS tahoe, but whenever it occurred, the drivers front headlight would go out at the same time..

Last edited by deerebowtie; October 26th, 2009 at 10:53 PM.
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Old October 29th, 2009, 07:46 AM   #12
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replaced filter. no fixy. found broken ground strap from frame to body though. and the one from motor to frame is rough looking. going to replace those today
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Old October 29th, 2009, 08:29 AM   #13
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Quote:
Originally Posted by chevotass View Post
replaced filter. no fixy. found broken ground strap from frame to body though. and the one from motor to frame is rough looking. going to replace those today
That very well could be the culprit.
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