Silverado Z71 wheels/tires
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By Grumpy Bear · Posted
Two inches lower, same rake? https://www.belltech.com/categories/lowering/components/?Year/2026/Make/Chevrolet/Model/Silverado-1500/Submodel/WT/Drive/4WD/Engine/2.7L/EngineFuelType/GAS/BodyType/Standard-Cab-Pickup Mines a 2/4 drop. Gold Bowtie is nice. Love red trucks. Especially SCSB units. Nice thing about a knuckle drop is a no muss no fuss alignment without special A arms and no stress on the half shafts. -
So, I take it that one one has seen this before? Especially on the stock rotors? Is this a defect I should pursue with GM? I would love some thoughts or feedback. Thanks, Chris -
I like the rake, too, but I'm old. That gold bowtie is a nice touch. I'm also team no stickers, but I'd probably be too lazy to take them off myself. Now, how big of a turbo can we put on that thing? -
I can see MAP data on my scanner. Warm idle MAP reads about 10.3-10.6 inHg which is healthy. Baseline is ~29 inHg (atmosphere) with key off. So that means the engine is pulling about 18.4" of vacuum at idle (29 minus 10.6) which is healthy. No real vacuum leaks that I'm aware of. The MAP sensor appears adequately responsive but I replaced it just in case, and I erased codes and reset the PCM after replacing it. Still getting the code. It's frustrating that I don't have data to verify actual data of the requested vs actual pintle positions of the EGR when the PCM is commanding it. That would really help. That's why I'm going back to basics. A plugged EGR port may be staring me right in the face. Ports were crystal clear when I reinstalled the manifold but that may not mean anything now. It doesn't appear clogged as far as I can see where the EGR bolts on, but farther back/down in the manifold it may be filled with crud again. There's all kinds of carbon still coming out of the exhaust. On cold start as the engine warms, the exhaust drips a little moisture and spits if you goose the throttle. It's truly just condensation, but it leaves a black mess on the floor. -
By asilverblazer · Posted
Can you monitor vacuum/MAP readings? Particularly, during EGR activation? Can you bench test/check the EGR valve operation? Presumably the MAP sensor is OK. No other vacuum leaks, masking the correct operation of the EGR? Cats may be fried, but I don't think they are going to change your diagnosis of EGR operation.
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