Quick question about cleaned injectors

need RX7 · 07-08-2008, 11:37 PM

I had my injectors cleaned at Witch Hunter Performance a little while ago. They say to install them within 30 days of cleaning, but I had some setbacks with working on the car and it's been about 35 days since I got them back. I'll probably have them back in by this weekend. What could potentially happen if they are left to sit for too long?

RETed · 07-09-2008, 06:14 AM

They lock up.
For some reason, these fuel injector cleaning places cannot source out a cleaner / lubricant chemical that allows for really long shelf times after the initial cleaning.

Luckily, we have a pro fuel injectors shop down here in Hawaii.
We they first opened, no one knew of this problem.
We ran several sets through them, and we had problems with the fuel injectors not opening at all after sitting around for several weeks.
Their initial cleaner had a shelf life of about 2 weeks.
They started to change the cleaner chemicals, and now we've got a 30 day window - same like yours.
Because of this, we tend to take care of the fuel injector cleaning at the last minutes just to avoid this.

-Ted

need RX7 · 07-09-2008, 12:46 PM

Shit... Guess I better hurry up then

85rx-7gsl-se · 07-09-2008, 12:56 PM

Wow, never heard of this before. Good to know.

need RX7 · 07-09-2008, 02:54 PM

So, do you think I'll be okay with being a few days over?

classicauto · 07-09-2008, 03:12 PM

Shouldn't hurt.

But worst case, drip some fuel into the feed end of the injector and cap it. At least then its got something else other then air/cleaning agent inside it.

dregg100 · 07-12-2008, 04:00 PM

you can free then up by shocking them with 12v for a split second.

Max777 · 07-13-2008, 01:08 AM

Quote:

Originally Posted by dregg100

you can free then up by shocking them with 12v for a split second.

are you shure this wont mess them up? I just want to be certain in case i need to do this...

RETed · 07-14-2008, 07:14 AM

There is nothing wrong with doing that.
In fact, that's exactly how they work normally.
The circuit is PWM 12VDC.

I would one step further and try and get (pressured) gasoline to flow through the injector.
It's the cleaning chemical that locks up the injectors.
Once you flush them out (with gasoline), they store fine.

-Ted

BLKTOPTRVL · 07-14-2008, 02:45 PM

Quote:

Originally Posted by RETed

There is nothing wrong with doing that.
In fact, that's exactly how they work normally.
The circuit is PWM 12VDC.

I would one step further and try and get (pressured) gasoline to flow through the injector.
It's the cleaning chemical that locks up the injectors.
Once you flush them out (with gasoline), they store fine.

-Ted

If this is the case, then how much pressure is usually in the rail during opperation of the injectors?

classicauto · 07-15-2008, 10:39 AM

stock is ~38psi.

RETed · 07-15-2008, 02:29 PM

Just like classicauto said...
It's about 40psi at "0" atmosphere.
You can run it up to 60psi if you like, but keep it under 70psi if possible.

-Ted

TehMonkay · 07-16-2008, 12:56 PM

40psi

07-08-2008, 11:37 PM	#1
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI Posts: 485 Rep Power: 18	Quick question about cleaned injectors I had my injectors cleaned at Witch Hunter Performance a little while ago. They say to install them within 30 days of cleaning, but I had some setbacks with working on the car and it's been about 35 days since I got them back. I'll probably have them back in by this weekend. What could potentially happen if they are left to sit for too long? __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.

07-09-2008, 12:46 PM	#3
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI Posts: 485 Rep Power: 18	Shit... Guess I better hurry up then __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.

07-09-2008, 02:54 PM	#5
need RX7 Clean S4 Nutswinger Join Date: Mar 2008 Location: Sterling Heights, MI Posts: 485 Rep Power: 18	So, do you think I'll be okay with being a few days over? __________________ -Ted -1986 Mazda RX7 Sport [DD/beater]: engine finally let go at 205k. parts car status. -1986 Mazda RX7 base [resto-mod project]: S5 n/a swap in progress.

07-12-2008, 04:00 PM	#7
dregg100 Rotary Fanatic Join Date: Feb 2008 Posts: 432 Rep Power: 18	you can free then up by shocking them with 12v for a split second. __________________ '93 SSM Touring-S475... '87 Tii-LS1/T56

07-16-2008, 12:56 PM	#13
TehMonkay Rotary Fanatic Join Date: Apr 2008 Location: Louisville, KY Posts: 302 Rep Power: 18	40psi __________________ My car blows up everytime I start it, it's rotary

07-09-2008, 03:12 PM	#6
classicauto crash auto?fix auto Join Date: Feb 2008 Posts: 816 Rep Power: 18	Shouldn't hurt. But worst case, drip some fuel into the feed end of the injector and cap it. At least then its got something else other then air/cleaning agent inside it.

07-15-2008, 10:39 AM	#11
classicauto crash auto?fix auto Join Date: Feb 2008 Posts: 816 Rep Power: 18	stock is ~38psi.