92tsifwd
15+ Year Contributor
- 572
- 0
- Feb 1, 2004
-
Hastings,
Nebraska
Ok I finally got my wide band calibrated and installed. I have been fighting a lean issue with my 90 Talon awd since I bought it a year ago. I bought it with a bad ecu and it was running lean closing the gaps and showing signs of detonation on the plugs. I went to BPR8ES plugs put in an eprom ecu that was rebuilt by ecm tunning and tested. I have swapped coil pack, transistor, It now has Delphi 1000cc injectors and aromotive A -6 regulator at 43.5psi, -6 from filter to rail, walbro 255 lph hp rewired, getting 18 volts at pump at idle. eprom set for injectors and 2g maf. Car runs about 14.5 afr when cruising and around 15.5.1 at idle which might be a tad lean. When under wot it is around 12.0.1-12.5.1 afr. If I stay in it it will break up and close the gap on # 1 spark plug. I have now confirmed it is a lean issue. What would cause this? The tune is very conservative with 16* total timing and 11.0.1 set in the eprom. There are no boost leaks what so ever. tps is set with logger to 10.1% closed throttle. I will check it with a volt meter. The base timming is at 5* btdc. It is not 180* off. Would a cas cause this or a injector resister pack? There is a a/f gauge tapped into the stock narrowband. Would this cause a voltage drop? I am using a NGK afx wideband in the downpipe right under the firewall. The car goes lean as soon as I get into boost.