How to clean and flow test your injectors for about $40

[douglas vincent]

1 - go to the junkyard

2- pull an intake manifold off and salvage the hard fuel lines and injector bosses. Cut off a few injector clips. LEAVE THE INJECTORS. The junk yard may want to charge you for them.....

3- find the scrap fuel pump and yank it.

4 - go home

5 - buy a gallon of denatured alchohol and 2 gallon bucket

6- hook up the fuel pump to a battery, the hard fuel line, and route the return to 2 gallon bucket. The pump MUST be wired correctly. If you are hearing the pump work, but no fuel coming out the hose, SWAP THE - and + wires.

7 - wire the pump to a spare battery. Make sure it works.

8- wire up the injector clip (s) to longer wires so you can attach them to the battery to turn them on.

9- turn pump on and one injector.

10- BINGO, you are now running alchohol through your injector at a 100% duty cycle!

11- You WILL be able to see if your injectors are clogged or not. Its pretty obvious because a clean injector sprays so perfectly.....Check alll your injectors against each other.

12- to measure flow rate, simply run each injector for 15 seconds into a receptacle 3 time and average the amount. Measure the amount and multiple by 4. Thats your flow rate. Obviously you need a CC reading receptacle.

Have fun!

[theflystyle]

nice write up

[quicklook]

all except number nine makes sense.

i read something like this on a ford forum once before.

they used a cheap in line pump instead of an in tank one.

[napphappy]

One Heads up:

I have done this before, Just DONT use rails or lines that smell like varnish AT ALL.

I used the same set up(except I used Injector cleaner) and everything worked fine, for a couple minutes. Then #4, the last one before the FPR, started to slowly flow less and less untill it was just a drip.

Turns out, the cleaner started to dissolve the varnished gas that was in the lines, and it completly clogged the screen on the injector.

So I ended up taking them to a local shop and had them flow tested.