90 2+2 N/A rough idle issues
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Thatbrokenz90
- Posts: 1
- Joined: Sat Jun 13, 2020 1:02 am
- Car: 1990 Nissan 300zx 2+2 na with a 95 motor
90 2+2 N/A rough idle issues
So my 1990 na with a 95 motor has developed a rough/jumping idle. I have tested for vacuum leak with a smoke machine, vac gauge and a boost leak tester on smaller components. My injectors are in spec as well as coils, ptu ie brand new, cas is functioning properly, I tested maf as well but still no luck. Compression is good. No codes. Has anyone ever seen this?
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NolimitZ32
- Posts: 7112
- Joined: Fri Jun 27, 2008 9:07 am
- Car: 91 AG2 2+0 TTMT swap/E39 BMW 540i6/E53 4.6is Dinan S3
- Location: Houston, TX
Re: 90 2+2 N/A rough idle issues
How did you test the MAF?
Have you tested the TPS?
Have you confirmed correct spark at all cylinders.
The FSM in my signature has a wonderful troubleshooting section, check it out.
Have you tested the TPS?
Have you confirmed correct spark at all cylinders.
The FSM in my signature has a wonderful troubleshooting section, check it out.
Re: 90 2+2 N/A rough idle issues
I know this is old, but if anyone is having similar issue.Thatbrokenz90 wrote: ↑Sat Jun 13, 2020 10:24 amSo my 1990 na with a 95 motor has developed a rough/jumping idle. I have tested for vacuum leak with a smoke machine, vac gauge and a boost leak tester on smaller components. My injectors are in spec as well as coils, ptu ie brand new, cas is functioning properly, I tested maf as well but still no luck. Compression is good. No codes. Has anyone ever seen this?
Turned out to be a bad alternator. It was overcharging at 18V+ (bad voltage regulator) and the idle jumps were jumps in voltage.
Re: 90 2+2 N/A rough idle issues
Good find dude!
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