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GMC1500SLT

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GMC1500SLT New Member

GMC1500SLT

Posted
Posted

hey guys I'm new onumber here.

 

To get this kicked off, my truck is stumbling/surging while aceleration. After RPMs reach about 1200-1500 it will stumble badly and misfire like crazy.

 

Some info on my truck

100,xxx miles

bought'er about 6-7 months ago

has 12" lift on 37's

5.3L 323 CID

4L80E Trans.

 

 

OK I don't even know where to start here.

when I first got it the fuel pump was going out so it was replaced by the dealer.

it's been running PERFECT since then. This last week it's been around 31 degrees and lower.

So Friday around 8 pm I was heading over to a buddy's to have some beer and hang out with the girl. my truck started to surge very lightly and seemed like it had a lack of power going up a small incline. Drove about 4-6 miles and it started getting real bad. Bucking like crazy and NO power whatsoever.

 

So I drove it home thinking it was plugs so I pulled them went to auto zone and got some champion iridiums. Ran a bit better after new plugs, so I took it for a test drive... then it really started getting bad.

so I drove it home and parked it, next day took it to the dealer(driving about 20 mph for 15+miles to the dealer).

The scanned it and looks like maf needed cleaned, cylinders 2-4-6 coils are failing, knock sensors have failed, secondary inj system, cat converter efficient Be

codes pI'll ed

P0300

p0102

p0332

p0410

p0430

p1415

Those are all codes.

 

I was told that a plugged cat could cause this, reason I ask is I replaced coils and hasn't helped, did knock sensors, cam, crank, tps, iac, egregious valve, fuel reg, damn near everything I've done that it I can't figure it out!!

 

If you guys have any clues please let me know

 

PS. Sorry for shitty typing, using an old work tablet.

8.1HD/ALLISON Senior Enthusiast

8.1HD/ALLISON

Posted
Posted

Welcome aboard. Are any codes current? I woukd start by diagnosing them first. Yes a cat clogged can cause what you are describing. Check backpressure. And i would throw those champion plugs in the trash and get the acdelcos it calls for. I have seen that cause your issue too.

GMC1500SLT New Member

GMC1500SLT

Posted
  • Author
Posted

Yes all those codes are present. They ALL just pop ed up when it started to surge. And I'll make a trip to the auto part store and put some acdelcos back in it today. And I'll pull my 02's and hook my pressure testers up to it today as well.

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