Has anyone had this happen?

[sykosledhead]

08 D8 with pump gas turbo. Just finished total rebuild running 50/50 110 and 91 pump with extra oil for first tank. Ran it on stand for a month or so to seat rings. After rebuild, idle was slightly fast. Ran it twice in Snowies, just goin on road to break in. Went of drift and sled wouldn't run. Unplugged TPS, works fine. Took it to Polaris and had TPS adjusted, baseline and TPS good. Now since then if you don't open the throttle with sstart, won't fire up. Open the throttle some and it fires and runs ok with some gas. If you let off, after about 5 secs, it goes into limp mode and dies with a little gas. If you open the throttle, it runs ok, let off it dies after 5 secs. Its on the video but hard to see.


Any ideas? I want to rerun the ground, check the reeds, check the skirt of the pistons, and check for leaks in the intakes. I put a new intake boot in with the rebuild so it should be ok.

http://www.youtube.com/watch?v=a4iFgqbzAN8&context=C3d85480ADOEgsToPDskLpEVFch5LGZg5pvs1dtVlL

syko.

 

[throttlejocky316]

Kind of sounds like what I experienced this morning BD race gas turbo D8. I pulled the throttlebodies to check the reeds and clean things up a couple of days ago. Put it all back together and the sled wouldn't start unless I held the throttle open just slightly. After an hour of messing with it I finally figured it out. There are two vacuum ports drilled on the top of the throttlebodies and they have hose fittings screwed into them. I screwed the fittings down just a hair to far and it wasn't letting the butterfiles close all the way which was messing with the TPS. I adjusted the fittings up a little bit and it runs like a champ now. Hopefully your issue is something as simple as mine was.

 

[sykosledhead]

Thanks TJ316

I'll give it a try. I'm having a hard time getting the video to attach so am working a different angle, youtube instead.

syko

 

[sykosledhead]

editted with video of sled

I added the video. Its hard to see but if you watch when I let all off throttle, it dies in about 2 secs.

syko

 

[sykosledhead]

TTT

Anyone know anything like this?

syko

 

[turbo td]

what type of turbo

 

[m1kflyingtiger]

I had that happen on mine when I first put the turbo on and adjusted the idle down a little bit (which screws up my baseline). I thought I had the jam nut right on the idle adjust screw but with the vibration if one ride it started backing out little by little and eventually fell out. With that screw gone the motor was choked completely and the tps was way low trying to start. Crack the throttle a little and she fired right up and ran great as the tps and butterflies were still synced, let off the throttle completely and it would choke itself out again.

 

[die hard poo]

Ya I would try to raise your idle up some. Turbo sleds with all the extra electronics and intake/exhaust restrictions at idle like a it to be a higher idle. The other thing I noticed is that you said you "seated the rings" on the stand... Hopefully you don't have blow by on your rings. You must break your motor under a load (aka riding the sled). This will seat the rings based on high cylinder pressure against the cylinder walls. I would check out this method for break in.
http://www.mototuneusa.com/break_in_secrets.htm

Maybe check your static compression too... Good luck!