thingraylinetah
Full Access Member
I hope that these repairs will fix my issues because if they don't it might be bye bye tahoe. I mean I'd love to get a new 5.3 crate motor if this one dies but my wife would never allow it.
Thin gray line tahoe build
- Thread starter thingraylinetah
- Start date
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pwtr02ss
Full Access Member
I can't remember your exact year, but some of the earlier years had a serviceable pcv valve. If so, replace it. Could also do a seafoam treatment on the cylinders. Possibly an oil control ring stuck. Notice any smoking at start up, especially after long drives on the interstate?
thingraylinetah
Full Access Member
NO, not really. I went out and checked the oil today and it was full. I also drove it some today and no check engine light.
thingraylinetah
Full Access Member
I'm going to drive it for a week before I call it fixed.
thingraylinetah
Full Access Member
Well gents. It ran fine for about 24 hours. Then the check engine light came back on and the gas mileage went way down again. I am going to have my son read the code when he gets home. If it comes up as a knock sensor code still. That means that it is detecting an engine knock. At which time I think it will be scrapped and gotten rid of. I guess I am just not destined to be a Tahoe owner.
You’re giving up way too easy. What brand knock sensors did you install? If they’re Dorman, there’s your problem. They’re known to fail, only go with OEM. And it could still be your MAF. I believe you only said you cleaned it? If it’s still throwing a MAF code, try replacing it with a Delphi OEM, again not aftermarket. Your lifter tick may be broken exhaust manifold bolts- check to see how many broken ones you have. I’d be willing to bet you have a few and the exhaust leaks have fooled many owners of these vehicles. These engines are pretty bulletproof.
thingraylinetah
Full Access Member
Delco sensors, maf was replaced with a brand new one that was on a yukon we bought for parts. It is a Delphi one.
My wife holds the purse strings and she won't let me use any money to fix it.
thingraylinetah
Full Access Member
Well sorry to report that the check engine light has come on again and no codes can be read on the code reader.
drdave81
Full Access Member
You should try a different code reader. If the check engine light is on, there are active codes. If you can't get a different reader, go to Autozone or similar and have codes read for you.
thingraylinetah
Full Access Member
I borrowed a different scanner and it was the knock codes again. I found out from my step son that when he installed the knock sensors and wiring for the knock sensors that the check engine light went off automatically so he didn't clear the code. I cleared it with this advanced reader. So maybe it'll stay off this time. I'm hoping it does anyway!
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thingraylinetah
Full Access Member
I guess if this reset don't work it's time to get it into. Shop.
Tonyrodz
Resident Resident
Did he do the rtv dam around the knock sensors?
thingraylinetah
Full Access Member
Yes
thingraylinetah
Full Access Member
Bad news lost all oil pressure just now.
Tonyrodz
Resident Resident
Dammit! Now what?
That’s not good. Are you sure it’s not just the gauge?
thingraylinetah
Full Access Member
No, it's full of oil but for some damn reason the engine is knocking. My step son said he thinks it's about to throw a rod so I got it parked for now until I decide what I want to do with it. I'd like to put a crate motor in it but I'm not 100% sure yet.
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