[nerdpatrol]

Is this because my TPS isn't adjusted correctly? I put in a new O2 sensor and newer late model largeport in my 85. Any suggestions? I was wondering if the late models ECU's are pnp. Lemme know!

 

[TomsMR2]

are you using a wideband o2 sensor to determine that its going lean?

 

[nerdpatrol]

no i'm using a narrow band.. but before i changed the motor it read rich at WOT.. so I'm kinda wondering what the problem is.

 

[NickBrewer]

Which injectors did you use in your swap? The early model years used low impedance injectors, I'm pretty sure that tthe later models used high impedance injectors.

 

[nerdpatrol]

im using stock injectors from my bluetop. i switched over all the electronics. so i'm not sure what the deal is. the tps is definitely not adjusted right. will that cause it to lean out on wot till redline?

 

[highcomp]

i'm unsure but your afm could be going. i know they control fuel and will go lean/rich when not working properly

 

[fogjammer]

Have you compared fuel pressure...just a thought, fuel pressure will affect fuel delivery. 85 rail pressure is regulated to 24 to 31 psi with vacuum going to the regulator and 33 to 40 without, according to my Haynes. Perhaps your regulator is not getting its vacuum vented at WOT resulting in a wrong fuel pressure. This is controlled by a VSV, (fuel pressure up VSV)

 

[reza330]

I have the some problem with my 20v. I think it's because the regular O2 sensor. That's why i'm trying to find wide band O2 kit to test it out.

 

[nerdpatrol]

im using a late model fuel rail. maybe the regulators are different? the late model when I got it was connected directly to the intake manifold. i routed it from the VSV to regulator from the IM like I had it on the old motor. Should I try it without the VSV? I think I need to pick myself up a fuel pressure gauge.

 

[nerdpatrol]

still looking for answers.

 

[nerdpatrol]

I pulled my plugs after a few WOT runs and they had a lot of white stuff packed on the plug. Is that a sign of running super lean?

 

[fogjammer]

Yes, paper white is lean. Crusty tan is oil burning under conditions of good compression. I've been working on making up fittings to adapt pressure gauges to fuel systems. If you need such a fitting, holler, and tell me where you want it to tap in at.

 

[nerdpatrol]

well i figured my timing was a few degrees advanced. now it pulls like a champ.

 

[fogjammer]

Nice going :thumbup