KevinD92

So I have an 08 LS3 with ECS 2200, blower cam, ARH catted long tubes, and Meth. It started out with the "sputtering" or choppy sound when accelerating periodically. It would come and go for about a week. Now, it's always there and the car feels very sluggish. There is no CEL and I've even checked for codes, but there are none. I've cleaned the MAF and throttle body, made sure the intake filter was secure, and changes the engine oil. What's going on?


Also, I just removed each plug wire (AC Delco) and measured with a multimeter. They all measured right around 800 ohms.

tuboy19

I would bet it's your cats dying. Just gutted some ARH cats that were causing all sorts of issues. Big power and cats just don't go together.

KevinD92

I thought that could be a possibility. My Autometer Fuel pressure gauge reads just over 60 PSI, so I don't think it's the fuel pump.

C5 Pete

Yeh. Take the cats off and take it for a drive. Could very well be the issue.

KevinD92

I didn't want to bang them out if that's not the problem though

C5 Pete

Don't bang them out, just remove them. Sure it'll be loud, but you're only taking it for a test drive.

KevinD92

I have the car up on ramps to check the cats tomorrow afternoon

slow-v6

800 ohm Wires!!

Probably cats, like everyone is saying. Do you hear any rattle sound when wot? Might also be knock.. We're did you get tuned??

KevinD92

ECS tuned it. I think it was an injector not completely clipped in, because it's running normal again, for the most part. I'm getting high negative low term fuel trims at idle only and white smoke with a gassy smell from the exhaust

slow-v6

May want to take it back to them. They may have tuned it with the injector not working 100%. You maybe get much more fuel then you need.

KevinD92

Nope, it was completely fine up until recently