I just got back from the Dyno session at Rosen. I put down 171whp so we began looking for the issue. I found that the TPS never registered 4 volts no matter where I adjusted it. I was right around 3.28-3.45 or so (didn't write it down). I finally finished the dyno and came home and did some more checking. The reference voltage going to the TPS should be 5 volts. It was 4.28. Ground was good. I then switched out the JWT ECU for my DE ecu and then the reference voltage went up to 5.07. Obviosly I will call JWT on Monday but does anyone have any ideas on what is going on. Is this normal for a JWT program (I am sure it is not but thought I would ask). Thanks in advance.

I have a JWT ECU for my SR20DE. With throttle closed I'm seeing 0.48 volts; at WOT I register 4.16 volts. Sorry, but I've never heard of anyone experience what you're seeing. :(

Steve

I was just thinking that maybe I should have posted this in the Technical section and not the VE section. It is really not VE specific at all.

steve i have never experienced that kind of situation before, but its rare but sometimes things happen and the reprogrammed ecu have some slight error. check with clark on monday try to get him before 11:30 PST. im sure he'll figure it out.

This is an issue with the 98+ cars. I'll send you some emails from Ray K. about how to fix it. YOu disconnect some sensors related to the EVAp purge controls.

Originally posted by jacen99SE
This is an issue with the 98+ cars. I'll send you some emails from Ray K. about how to fix it. YOu disconnect some sensors related to the EVAp purge controls.

where can i get more info about these problems? ive never heard of it and i worked at nissan never saw any tsb's about anything like that.:confused:

Originally posted by jacen99SE
This is an issue with the 98+ cars. I'll send you some emails from Ray K. about how to fix it. YOu disconnect some sensors related to the EVAp purge controls.


OH MY GOD IT WORKED:D :cool: :D Thank you so very much. You are the man. Must go drive car now. :D

Originally posted by CAMPPAIN


where can i get more info about these problems? ive never heard of it and i worked at nissan never saw any tsb's about anything like that.:confused:

Its only an issue if you have a 97 or earlier JWT ECU in your 98+ car. I don't know if the G20 ECU in the 98+ cars does this or not.

Here's the fix:
Disconnect the 3-wire sensor that is connected to a black box near the gas tank filler tube. There is a 2-wire sensor near the 3-wire one, I left the 2-wire connected.
Disconnect the 3-wire sensor on the firewall near the intake manifold labeled 'BOOST'.

(for offroad use only) :o

Originally posted by 98sr20ve



OH MY GOD IT WORKED:D :cool: :D Thank you so very much. You are the man. Must go drive car now. :D

;)

Did it make much of a difference?

Originally posted by jacen99SE


;)

Did it make much of a difference?

Yes it did. It now idles correctly and seems to accelerate better. My butt dyno is all out of wack. I have driven the car with the stock exhaust and with a 2.5 inch that gains me 12 whp. Switched it twice now so it is a little confusing to tell what my car has (basically, I haven't driven the car more then 5 days without making major changes). I will be dynoing again this weekend. Thanks again.