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How I fixed my cutting out/stumbling/missing on my '99 Blazer

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Old 12-08-2011, 05:26 PM   #1
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How I fixed my cutting out/stumbling/missing on my '99 Blazer

With the guidance of my childhood friend who has been a mechanic for about 40 yrs., I was able to fix my 1999 S-10 Blazer 4.3L problem. I've got 160K on my SUV. The symptoms were 1) Only after the engine was warm it would cut-out intermittently for a micro-second, it would miss intermittently or stumble intermittently. There was no pattern to the problem : whether accelerating or coasting & NO CODES being generated. Like 99% of Blazer owners, I changed fuel filter,air filter , cleaned the EGR valve and sprayed water on spk. plg. wiring to check for breaks in them w/ no real improvement. It had been exactly 60K since last tune up so I installed new dist. cap, rotor,wiring & spk. plgs.....Still no change in symptoms.. I called my friend Frank, he told me to disconnect the EGR valve & drive it X 15 -20 min. & report back findings . It improved very little. Frank then had me re-connect EGR valve & disconnect the mass air flow sensor & drive x 15-20 min. Voila!! All symptoms disappeared!!!!! The MIL lit up this time. I replaced the mass air flow sensor(Only new not reman. O.E.M. AC Delco per Frank's instructions). It cost me $ 236.00 out the door @ Full Service Co. in San Antonio,Tx.). BTW I did find a new one online for $111.0 before shipping but I don't have the time to wait for it. It's been 4 days now & SUV runs like a champ. I also found a great website to help w/ diagnostics...."http://easyautodiagnostics.com/" R.A. D.
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Old 12-08-2011, 06:08 PM   #2
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

I'm having the same problem with my 99 sonoma. I will try this and see if it helps.

Thanks for posting how you fixed the problem.
Old 12-08-2011, 09:04 PM   #3
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

i'm having the same problem...gonna try this
Old 12-08-2011, 10:20 PM   #4
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

Just unplugged mine and it doesn't feel laggy in the low end again. Where did u find the one for 110?
Old 12-09-2011, 01:19 PM   #5
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

^ The same thing happened to me. I have been looking around online for one.

Auto parts warehouse has some.

http://www.autopartswarehouse.com/se...0Flow%20Sensor

I called a local parts store that I usually buy from and they want $286 for the sensor.

RockAuto has a delphi mass air flow sensor for $109.34.

There is a 5% discount code for RockAuto you can use on it too.

http://www.s10forum.com/forum/f279/r...1/#post7643904
Old 12-09-2011, 01:49 PM   #6
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

I have been cleaning my every once in a while on all my vehicles. Using the special spray for electrical. Has anyone tried cleaning theres before replacing?
Old 12-09-2011, 07:48 PM   #7
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

I haven't ordered the sensor. I will look into cleaning it.
Old 12-09-2011, 07:55 PM   #8
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

I visited the link the OP posted. I read the how to clean the maf section. I had no idea the two ends could come off the actual maf. I took those off and found it was still dirty despite "cleaning" it twice before. Used almost a whole can of electrical cleaner on it until the "hot wires" looked new. Now it has its BALLS back!
Old 12-09-2011, 08:29 PM   #9
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

Thanks for the info. I will have to check that out. Hopefully it will work for me too. I didn't have any codes for it before I unplugged it.
Old 12-09-2011, 08:40 PM   #10
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

Neither did I. I just knew something was wrong but didn't have time nor money to troubleshoot. Today is the first time in a while I enjoyed driving my truck.
Old 12-10-2011, 12:09 AM   #11
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

I have to say, I want to vote this guy for BEST FIRST POST EVER!

I too will try this. tomorrow.
Old 12-11-2011, 11:02 AM   #12
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Lightbulb Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

Quote: Originally Posted by BrandonR
I have to say, I want to vote this guy for BEST FIRST POST EVER!

I too will try this. tomorrow.
Id 2nd that,
Old 12-11-2011, 07:43 PM   #13
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

i tryed this today and it didnt work at all my truck still runs the same as before i did this test
Old 12-11-2011, 09:52 PM   #14
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

Quote: Originally Posted by dna59
Just unplugged mine and it doesn't feel laggy in the low end again. Where did u find the one for 110?

Just google the part. I think it was on Amazon or gmpartsdirect.com.

BTW -12/11/2011...... Follow-up to How I fixed my cutting out/stumbling/missing(Dec.2011) Yesterday the SUV starting acting up again w/ same symptoms but markedly less severe. This morning I started the SUV up (about 46 Degrees)..started right up & it idled for about 30 secs. & died. I started it up again & began moving wires/ connectors around & when I wiggled the coil wires I saw a spark between the to wires as they enter the coil connector. I shut down the engine & removed the connector, un-twisted the wire ,separated them away from each other & coated them w/ contact cement to insulate them. I drove the SUV all day & never had a hiccup. I guess that was the original problem? or that along w/ a bad MAF. Anyway..Happy it's all fixed!!! I write this so if anyone has this kind of problem ,they can check the coil wires for shorting. R.A.D.
Old 12-11-2011, 09:54 PM   #15
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

-12/11/2011...... Follow-up to How I fixed my cutting out/stumbling/missing(Dec.2011) Yesterday the SUV starting acting up again w/ same symptoms but markedly less severe. This morning I started the SUV up (about 46 Degrees)..started right up & it idled for about 30 secs. & died. I started it up again & began moving wires/ connectors around & when I wiggled the coil wires I saw a spark between the to wires as they enter the coil connector. I shut down the engine & removed the connector, un-twisted the wire ,separated them away from each other & coated them w/ contact cement to insulate them. I drove the SUV all day & never had a hiccup. I guess that was the original problem? or that along w/ a bad MAF. Anyway..Happy it's all fixed!!! I write this so if anyone has this kind of problem ,they can check the coil wires for shorting. R.A.D.
Old 12-11-2011, 10:06 PM   #16
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

i use a spray bottle to mist the wires if it starts looking like fireworks i replace the wires
Old 12-13-2011, 09:11 AM   #17
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Re: How I fixed my cutting out/stumbling/missing on my '99 Blazer

^neat trick...i gotta remember that
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