I've been having this low RPM hesitation for a while now. It has been getting worse over time. I've replaced a number of parts, but no luck.
The hesitation occurs when I'm cruising at lower RPM's and give the car gas without down shifting. It will start hesitating and popping, and feels like it's running on 3 cylinders. If I down shift to get the RPM's up and then accelerate, it's fine. The problem was solved when I unpluged the 02 sensors, it seemed to run smooth and not hesitate, but it returned. It got so bad the car was back firing slightly under low RPM load.
Here is a list of replaced parts/services done:
I just did the RDX/ECU Rom from Prospeed and it runs much better(I was hoping it was the injectors). But I noticed the hesitation is still there down low when I try accelerating at lower RPM's. It's not as bad, but it's still there.
My thoughts/research via "search" are to replace:
SPECS:
1991 Acura NSX 5 speed
dc headers
test pipes
Pride V1 exhaust
intake/unifoam filter
RDX injectors with Prospeed ECU Rom
The hesitation occurs when I'm cruising at lower RPM's and give the car gas without down shifting. It will start hesitating and popping, and feels like it's running on 3 cylinders. If I down shift to get the RPM's up and then accelerate, it's fine. The problem was solved when I unpluged the 02 sensors, it seemed to run smooth and not hesitate, but it returned. It got so bad the car was back firing slightly under low RPM load.
Here is a list of replaced parts/services done:
- 02 sensors(bosch)
- spark plugs(ntk)
- air filter (unifoam)
- main relay (oem)
- cleaned throttle body
- fuel injector cleaner
- fuel filter (oem)
- coil packs (oem)
- fuel pump (walbro 255)
- installed a fuel pressure gauge...pressure normal
- checked ground connections
- "ignitor"/ICM (Ignition Control Module)
- 02 sensors again (ntk)
- injectors (rdx swap)
- oil change
- new battery
I just did the RDX/ECU Rom from Prospeed and it runs much better(I was hoping it was the injectors). But I noticed the hesitation is still there down low when I try accelerating at lower RPM's. It's not as bad, but it's still there.
My thoughts/research via "search" are to replace:
- speed sensor
- fuel pump resistor
- throttle position sensor
SPECS:
1991 Acura NSX 5 speed
dc headers
test pipes
Pride V1 exhaust
intake/unifoam filter
RDX injectors with Prospeed ECU Rom
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