Throttle response issues

Nissan 300ZX technical discussion forum: Maintenance, performance, installations, modifications, how-to's and troubleshooting.
bgibb
Posts: 15
Joined: Wed Oct 21, 2020 1:50 pm
Car: 1990 NA Z32 with a 95 engine and a 93 trans

Post

95 2+2 (2nd gen obd1 spec), all parts are OEM or OEM+ from z1

Alright so I blip the throttle and then hear the air surge into the engine, but THEN the power comes on and rpm climbs. Stumbles on itself for a second it seems. I snagged a couple pics of datalogging to show you guys, i want your thoughts before I start tearing anything apart


bgibb
Posts: 15
Joined: Wed Oct 21, 2020 1:50 pm
Car: 1990 NA Z32 with a 95 engine and a 93 trans

Post

Ugh forum wont let me upload picture, says image too large. I'll figure something out and get back to you guys tonight

bgibb
Posts: 15
Joined: Wed Oct 21, 2020 1:50 pm
Car: 1990 NA Z32 with a 95 engine and a 93 trans

Post

Here's my idle data
Attachments
20210501_130130.jpg

bgibb
Posts: 15
Joined: Wed Oct 21, 2020 1:50 pm
Car: 1990 NA Z32 with a 95 engine and a 93 trans

Post

This is my datalog. Top graph is the O2 and Throttle sensors, bottom graph is the rpm.

You can see that at the moment the throttle goes up, rpm dives then climbs, and o2 values change drastically after letting off, while rpm also hangs a little lower than previously
Attachments
20210501_131233.jpg

bgibb
Posts: 15
Joined: Wed Oct 21, 2020 1:50 pm
Car: 1990 NA Z32 with a 95 engine and a 93 trans

Post

Mass Airflow sensor seems to have solved the majority of the issue, picked up new o2 sensors but have not installed them yet. Gonna get that done and fiddle with the TPS a bit to see if I can clean the last bit of it up, but I think I'm back up to full power now friends :D

frenchfry24t
Posts: 7
Joined: Thu Jun 04, 2020 3:54 am
Car: 1990 300zx Coupe N/A

Post

bgibb wrote:
Thu May 13, 2021 4:22 pm
Mass Airflow sensor seems to have solved the majority of the issue, picked up new o2 sensors but have not installed them yet. Gonna get that done and fiddle with the TPS a bit to see if I can clean the last bit of it up, but I think I'm back up to full power now friends :D
Good stuff :mike


Return to “300ZX (Z32) Technical”