Do injectors wear slowly and sap performance or do they just work "as new" until they fail?
With 94k miles, will most Q's see performance and driveablility improvement with new injectors?
Injectors on '98Q
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: Injectors on '98Q (duck3986)
Injectors can last 300,000 miles plus depending on the fuel you use thru them.
The trick is to use 2-3 applications of BG44k if the performance idle improves you know the injectors and or the intake valve backs were dirty.
The trick is to use 2-3 applications of BG44k if the performance idle improves you know the injectors and or the intake valve backs were dirty.
Re: Injectors on '98Q (Q45tech)
What is the maximum fuel pressure the injectors hold back?
I'd like to check them for leaks and also since I broke many of the plastic retaining fingers on them, I'd like to make sure the injectors aren't going to move when under pressure.
I don't have a way of doing a liquid pressure test, but i could easily do an air pressure test with my compressor. Is there any reason 30 or 40 psi of air will do any damage to fuel injectors?
I'd like to check them for leaks and also since I broke many of the plastic retaining fingers on them, I'd like to make sure the injectors aren't going to move when under pressure.
I don't have a way of doing a liquid pressure test, but i could easily do an air pressure test with my compressor. Is there any reason 30 or 40 psi of air will do any damage to fuel injectors?
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Q45tech
- Moderator
- Posts: 14296
- Joined: Tue Apr 30, 2002 3:19 am
- Car: 1990 Q45 342,400 miles 22 years ownership with original engine
1995 G20t 5 speed 334,000 miles 16" 2002 wheels - 205/50/16 Sr20ve vvl
Re: Injectors on '98Q (duck3986)
Air pressure won't tell you anything.......viscosity of fluids.
The max normal WOT pressure is 43.4 psi vs idle 34 psi. Always replace the orings. Buy a fuel presssure gauge.
Normally they won't leak till >80 psi.
The max normal WOT pressure is 43.4 psi vs idle 34 psi. Always replace the orings. Buy a fuel presssure gauge.
Normally they won't leak till >80 psi.
Re: Injectors on '98Q (Q45tech)
Right now I'm less concerned about leakage and more concerned that the injector will be pushed into the intake since those plastic fingers broke off.