Partially toasted cats?

Have a KB that's probably making about 650 to the wheels (have not dyno'd) on 93 octane and have the ngauge. She's my daily driver and for the most part the KB kit has been very reliable and strong. I have a strange issue where at part throttle it just bogs and shakes badly, and if I don't let off the throttle I will sometimes even get a check engine light briefly. A few times it's bogged so badly that I've almost gotten hit when pulling out into traffic. Never does it at full throttle, more like when I get on it mildly such as getting onto the freeway. It seems worse when the car hasn't been running very long, but it can happen even after fully warmed up.

So the only thing I can think of is that the cats are partially clogged, or there's a tune related issue. Thoughts? How to determine if the cats are okay?

Been thinking of putting LT's on and ditching the cats, but not sure I want the added volume on my daily, plus I do most of my own work and I know the install is a pita. Might end up doing LT's though if my cats are clogged.

Thanks in advance.

Partially toasted cat

Really doubt its your cats,wot would bog even worse if the cats were clogged

Not your cats

Well ironically as I was driving to my son's football game the car started to sputter much worse than before and then shut off. Now it won't start. Turns over but won't start like there's no fuel, so I'm pretty sure the pump is fried. Waiting on a tow truck now. I'm going to see what options I have to possibly ditch the bap so I don't get stranded again like this. Sucks. About 19000 miles on the car and over 10k with the KB.

Do you have a boosta pump installed on your setup?

ArabianOak said:

Do you have a boosta pump installed on your setup?

Click to expand...

Yes I have the KB bap.

Likely killed the pump. Check all your fuses, though that would likely be instantaneous and not slowly die.

The boost a pump taps the plug of the fuel pump power, I would check the wiring under your passenger seat behind the driver seat to make sure it's getting proper voltage and nothing is loose, like venumous said if the fuel pump fail it won't slowly die, it'll just shut off immediately

Yes it was the fuel pump that left me stranded. As mentioned I've had the KB and KB bap on for about 10k miles, and the pump was cheap and easy to replace, so now I'm going to carry a spare in the trunk with a fuel line tool so if I get stranded again I can easily replace the pump. A friend of mine got about 9000 miles out of his fuel pump with a bap so maybe its not that unusual. Don't really want to put a full fuel system in it at this point since I don't plan to up the HP anytime soon and don't have time to mess with it.

From the picture above I think your cats are toast. Lol