Air and Fuel
Thread Starter
Staging Lane
Joined: Mar 2010
Posts: 69
Likes: 0
Air and Fuel Ive got an 02 ws6 H/C/I FBO tuned on 93, true duals with cats
When i start car my AEM wideband reads --- for nearly 3min before it starts pinging around 17's then back to --- then eventually goes to where normal idle AFRS should be at, if you try to give it gas it try's to die until its reading a consistent number. Is this normal for it to be that lean on startup for a few minutes or? Drivability is great other then that and #'s seem on point
When i start car my AEM wideband reads --- for nearly 3min before it starts pinging around 17's then back to --- then eventually goes to where normal idle AFRS should be at, if you try to give it gas it try's to die until its reading a consistent number. Is this normal for it to be that lean on startup for a few minutes or? Drivability is great other then that and #'s seem on point
Staging Lane
Joined: Jan 2018
Posts: 57
Likes: 8
From: Ottawa, Ontario
Wideband sensors do take a bit to fully warm up and give accurate readings, but 3 minutes is too long. Besides it sounds like you have a lean stumble until warm (or perhaps in closed loop). So I would suspect the Open Loop EQ Ratio is set too lean and the wideband is actually providing an accurate reading. Once in closed loop you get correct fueling. If you can get your tune currently in the PCM and upload it (need HP Tuner for this) we can take a look. If you have HP Tuner you can also write a new tune to the PCM to fix the problem.
On The Tree
Joined: Oct 2012
Posts: 124
Likes: 18
From: Jefferson, LA
When did you start having this issue? Have you made recent tuning adjustments?
I'd also suspect you're having lean issues while in open loop as brownrd had suggested. What's your ECT when your issues stop? Do you have tuning software? If it's happening in OL, you'll probably need to massage the OLFA table as brownrd stated in previous post. In HP tuners: Fuel -- Open Loop / Base -- EQ Ratio.
I'd also suspect you're having lean issues while in open loop as brownrd had suggested. What's your ECT when your issues stop? Do you have tuning software? If it's happening in OL, you'll probably need to massage the OLFA table as brownrd stated in previous post. In HP tuners: Fuel -- Open Loop / Base -- EQ Ratio.
