Here is old data that I collected 5 years ago:

"Lab" Notes

1. Pintle Cap affects spray pattern when not fully seated
   
2. 20 ohm vs 10 ohm vs 0 ohm current limiting shunt affects flow data
   - Example Experiment:10ohm gives 173cc/min and 0hm gives 178cc/min
   
3. Filter presence changes pattern shape
   
4. Back Flow with filter in makes biggest improvement when cleaning a poor flowing injector
   
5. Cleaning fluid flow rate changes over time (use gas on final calibration test)
   - Example 177 cc/min with cleaning fluid = 188 cc/min with gas (6.2% increase)
   
6. Electric Fuel Pump Pressure changes over time and the recirculating fluid temp. increases slightly.
   
7. Best Cleaning Technique:


1. Measure Flow
   
2. Remove Pintle Cap and put it in Ultrasonic cleaner
   
3. Backflow using 250cc of cleaning/test solution
   
4. Remove mesh filter and put it in Ultrasonic cleaner
   
5. Backflow using 250cc of cleaning/test solution
   
6. Manually forward clean injector using direct spray from canned carb cleaner's straw then soak in cleaner while manually activating the injector open and closed for 1 min
   
7. Manually forward clean injector using direct spray from canned carb cleaner for 30sec with the injector open to flush
   
8. Pull mesh filter and pintle cap from ultrasonic bath and back spray filter mesh with carb cleaner
   
9. Install filter and pintle cap
   
10. Flow test
    

Edited January 16, 201213 yr by Blue

Edited January 16, 201213 yr by Blue

A little silver paint and voilà:

Edited January 16, 201213 yr by Blue

Wow Blue, lots of excellent info here! I will study it. Thanks

During that summer I did the same tests on my Toyota Echo.

Cylinder 1's plug colour showed leaner than the rest and an initial flow test confirmed this lower flow.

After cleaning, all the injectors flowed the same. After 800km of driving, I re-checked the plugs and all looked the same.

Blue, where did you find new pintle caps?

Blue, where did you find new pintle caps?

Aren't they shown here?

SteveJ, pintle caps are the plastic caps you see at the tip of an injector. Unless I've been wrong for the past 25 years.

Okay, you might try Google. I did a quick search and found lots of vendors for different brands. Since the 280Z fuel injection was based on a Bosch design, I would think someone probably sells a compatible one.

Aren't they shown here?

No...

You can get a kit here. http://www.okinjectors.com/#!store/vstc5=accessories-store

I have never used this service but looks good. An body ever use them for

rebuild.

130 for the service.

<iframe width="420" height="315" src="http://www.youtube.com/embed/i1DtmmsxeZg" frameborder="0" allowfullscreen></iframe>

http://www.okinjectors.com/#!

Edited January 16, 201213 yr by black gold man

Here is a great DIY adapting what I mentioned above: