Catalytic Converters

[gm muscle]

Hello All,

I'm getting a PO430 Code (Catalyst Efficiency Below Threshhold) on my '97 K1500 Silverado. Its a single cab, short bed with a 5.7. I checked the torque on all of the exhaust manifold bolts and seems to be good but on cold mornings, it sounds like a diesel truck. Could this be the reason I am getting the code?

The truck has about 174K miles and still running strong. I bought the truck with 90K miles haven't replaced the converters, so it may be time. Suggestions?

Also, I priced the converters at the dealer (just in case)...$1300!! I think I might be able to get OEM stuff a little cheaper but its still a ton. I saw some Walkers on Rockauto http://www.rockauto.com/en/moreinfo.php?pk=3381939&cc=1051175&jsn=607

I know there are some non-OEM parts that you can install and get away with but I was told the Cats aren't one of them.

What do guys think?

 

[LMB1500]

Last I checked, a cat is a cat, so long as it fits, it's ok.

 

[df2x4]

$1300 for factory cats is typical stealership insanity. You can run aftermarket cats no problem, however I would recommend sticking to the bolt on type with the intermediate pipe instead of the universal weld in type.

Look into the Magnaflow intermediate pipe/cat assemblies. Can be bought for around $300, and bolt right up just like an OEM part. Much better bends in the tubing than the factory part as well. I have one on my red truck, love it.

 

[df2x4]

A little more expensive than I remember, but this should be the Magnaflow part you need. As long as you're not in CA or NY at least. They have a different part for those areas for emission regulations.

https://www.summitracing.com/parts/mpe-23453

 

[Pj_stock]

I paid $1300 (Canadian) for a magniflow exhaust system on my 98. The muffler shop replaced the original 2-cat system with one cat.

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[gm muscle]

Going from two cats to one? Did you have to reprogram the PCM?

 

[df2x4]

Going from two cats to one? Did you have to reprogram the PCM?

Pretty sure he just relocated the O2 sensors so both sets of them read efficiency on the same cat.

 

[shovelbill]

i got mine from here.... http://www.hottexhaust.com/

Jegs wanted like $576 and Summit wouldn't even send it to NY, the new fu@kin california.

got it in 4 days
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[Pj_stock]

Going from two cats to one? Did you have to reprogram the PCM?

@df2x4 that's right. Just remounted the O2 sensors in series upstream and downstream. Computer is happy

 

[boredandstroked]

Last I checked, a cat is a cat, so long as it fits, it's ok.

Nope. If the cat isn't as efficiant as the original you can still set off the CEL. And if it doesn't have a CARB number it isn't legal in CA emissions states.