Quote:
Originally Posted by COO86L
Sorry I haven't read word for word your whole post but what is your current vacuum level at warm idle (if you can maintain warm idle)?
Those DW 900's are fairly bulky injectors but shouldn't cause this much issue as they've been used quite often. I'd definitely at least try swapping OEM injectors and changing map to suit just as a test. Easy way to rule it out.
As to vacuum, I'd hook up an external vacuum gauge to a vacuum source just to see what it's coming back with.
As I believe a couple people have stated, leak down etc looks normal for a fresh engine. Have you done any break in what so ever, any moderate loading to bed the rings in? Engine hasn't idled at operating temperature for extended periods of time before rings bedding in? This could cause low compression etc due to poor ring bedding. Id also try running the engine in on the dyno (moderate load, 50% throttle then 75% throttle) or however your engine builder recommends and check everything again.
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Thank you so much for your help and input, I really appreciate it.
We thought it could be the rings being gapped to much, so we pulled the motor and changed the rings for a fresh set. Nothing changed.
We have not really done any breaking in THB, we have taken the car for a 5 minute drive here and there, and had it idling doing fifteen minute data logs here and there.
Was just trying to get a good tune in to be able to drive it around and break it in properly.
Symptoms are, The car starts but has a hard time idling when cold, but when it does warm up, it idles on its own and I can lock it off and turn it back on with out any throttle assistance.
I was just told that due to the poor vacuum the map cannot be cleaned up any further