First startup bugs
First startup bugs I recently got my ls swap running and trying to sort out a few bugs. When idling it surges up and down 200rpms, when I throttle the engine up and hold it it sounds good but when you let off and it goes back to idle it sort of stumbles and dies. The last thing it's doing is I revved it up to 2000 rpm and when I let off it stayed at 2000 then surged to 2700 so I shut it off. Does anybody have any idea what could cause these problems? Possible one thing could cause all of this?
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TECH Junkie
Joined: Nov 2013
Posts: 3,913
Likes: 366
From: White Bear, Mn
Mine did the same thing this past spring after getting it out of storage, would surge and drop or just stay at around 2000rpms, cleaned the valve, put it back in and let it idle for a bit with a bit of surging until idle dropped to normal and have not had a problem since
this isnt any help to your problem but you can get a wireless obdII scanner to use with a smartphone for less than 30 bucks off ebay and a free app called torque . Ive used my tons of times , well worth the money