Smitty454

Hey all, after getting my PCM flashed and my OBD II port working I finally fired up my new LS swap. It fired as soon as I turned the key and idled beautifully, however it does have one issue.

After letting it warm up a bit I decided to give it some throttle. I revved it up slowly but when I let off the gas it struggled for a few seconds to idle almost dying and then it smoothed out and ran fine. I did this a couple times with the same result.

I was running open headers because I had to cut my existing exhaust to get the 4l80e in there. I plan on getting them reconnected asap. I think I might just get a small length of pipe so I dont burn up my 02 sensors.

Any ideas on this one?

dlwilson

iTrader: (1)

Check your fuel pressure at the rail.

Pop N Wood

iTrader: (1)

Get your car together first than see if you still have an issue.

Project GatTagO

iTrader: (7)

Possibly needs some IAC tuning or might need to crack the throttle blade a little, if it is a cable operated TB.

Andrew

cdk4219

Lots of my swaps and even the stock factory cars have a difficult time finding a high warm idle when just powered up. I just changed the battery in my '04 2500hd lq4 and it took 50 miles to learn an idle that didn't almost stall when coming off the throttle. All of the swaps have needed some time to find this zen, and changing batteries or disconnecting can bring some unwanted behavior.

Smitty454

Awesome, thanks for the tips cdk. Thats some good info. Im used to disconnecting the battery when I park the chevelle. Its an old habit that I guess ill have to give up.