Non stock 88 C900 Turbo running very lean - Bulletin Board

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Non stock 88 C900 Turbo running very lean
Posted by JamieP [Email] (more from JamieP) on Mon, 30 Mar 2015 14:53:57
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Hello everyone

Let me start with the modifications on this car.
2.1 head, intake, fuel rail.
0 280 150 945 injectors
9000 intercooler
AID unit
custom mandrel bent exhaust
Innovate wideband o2 sensor
Swedish Dynamics red series turbo
The engine broke a piston a couple of years ago due to this issue, now with it rebuilt I need to figure this out.
This is whats happening, at idle the afr is around 13.0 and the instant the throttle opens it can spike as high as 17.0 and then settle down to 15.0 with the throttle still part open. Under boost it will stay at about 15.0 (I've limited the boost to 7 psi with a manual controller). Under no circumstances can i get it to run any richer. I've adjusted the ohms on the AMM very high, ive also turned the RRFPR over 40 psi at idle, both make it idle richer but once the throttle plate opens it leans out to 15-16 and stays there. This makes me think there's a vacuum leak but I cannot find any, Ive replaced all the intake grommets, the hoses and checked all the intake ducting. Ive also replaced the fuel pump, O2 sensor,throttle position sensor, swapped ecus, swapped AMM's, it consistently runs the same. I am totally stumped with this one.
Thanks for any suggestions


posted by 67.158.2...

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