i'm not getting enough fuel at WOT so i wanna take out my injectors and take them to get tested. how should i go about doing this?

 

taking them out is easy. there are 2 bolts per fuel rail that have to come out. then, just pull up on the rail to pop them loose. they are only secured by orings. then each injector has to have its elec connecter removed. also very easy. i use a very small flatblade screwdriver for that.

 

pull up the fuel rails carefully and evenly. The tubes are very thin walled. Obviously you have to retune for them, so have that ready.

 

FYI - You don't need to use a screwdriver to remove the connector from the injector, you just squeeze the retainer clip to release the connector.

 

yeah, but sometimes when i try that the little clip wants to hang up on the injector.

 

First things first:
By what standard have you determined the injs are the problem??
If they do need to come out:
1. Blow the dirt/crud off the intake, around the inj base.
2. If they are stuck in the intake, shoot a little WD around them, and let it sit for a bit.

 

well i've driven all the way across CT twice this summer to get my car tuned. Each time my tuner said he couldn't complete the tune (especially for WOT) because the car isn't getting enough fuel. So after the first time i went i replaced the fuel filter and fuel pump. the old filter was disgusting inside and so was the sock on the stock fuel pump. so i thought i was good to go. I went back again last friday and he only did partial throttle tuning because it still wasn't getting enough fuel for WOT. The motor makes small popping sounds when you floor it.

he told me it could be a couple things:
1. A Bad MAF sensor
2. 1 or more bad injectors
3. A bent valve due to piston to valve contact.
4. 1 or more bad spark plugs or wires.

When we were down there we cleaned the MAF and it helped a little. I put NKG TR55 plugs and MSD wires on the car last summer (less than 4K ago)... but i didn't put the heat protectors around the wires. None of them are melted but my tuner said they could be messed up on the inside. I know exactly how to test them, but i've been sick and bed ridden for a week now.

So i'm going test all the wires (maybe check the plugs too... 5 and 7 are really hard to get to ) and i will remove all the injectors to have them cleaned and flow tested. That should leave just the MAF and a possibly bent valve. i'm sure fixing/replacing a bent valve would be one expensive and difficult job. what do you guys think?

 

What was the fuel pressure when the tuner determined there was insufficient fuel?
Data logs show ??

 

we never checked fuel pressure and if we did it wouldn't have told us anything about the injectors because it's measured at the shader valve. He knew there was insufficient fuel because it was running lean. I can't remember all the details but he showed me graphs and stuff on his laptop and explained where things were out of wack. I don't really know anything about tuning or what data logs are.

 

"we never checked fuel pressure and if we did it wouldn't have told us anything about the injectors because it's measured at the shader valve. "
That's exactly where you check the FP. Fuel psi off, WILl affect the inj flow.
Just because he said it was lean, DOES NOT mean the injs are at fault.
If he was "tuning", found a problem, and didn't look at the Fp, find another tuner... Maybe the next 1 will be closer to home.

 

there's nothing else that can be at fault in the fuel system except the injectors or possibly the fuel rails. I've already replaced the fuel pump and fuel filter... do you know anything else that can cause a problem?

 

since you have no idea what the fuel pressure is, no one will be able to help you. If you cant get enough fuel, pressure is the first thing to check, you cant just start randomly changing parts and hope to fix it

 

i understand what you're saying but i'd bet my life that it's at 58 psi. when i bought the tester kit and hooked it up, gas sprayed out of one of the connectors on the kit and got in my eye and all over the car. i couldn't get it to work and can't find a different brand. It can still be at 58 psi and the injectors can be bad.

 

i will make a point to check the fuel pressure again sometime soon. anyways we got off topic... will any gas leak out when i remove the injectors?

 

as soon as you pull an injector out of the fuel rail, whatever fuel thats left in the rail will come out. not a whole lot though.

 

i really dont want gas all over my intake. is there a way to prevent that? would jacking up the front of the car make the fuel flow back? or can i drain it somehow?