93 Silvia running lean, I need some other opinions

[cheap_sticker05]

Yeah I have a file for them. I am going to pick up some stock injectors today, and put the stock mafs back on. If it doesn't fix it I am done.

[DeatschWerks]

A busted injector causing a lean issue would be spewing fuel into the engine bay. A busted injector causing a rich issue would be spewing fuel into the engine. I don't think you have an injector issue.

Well, I didn't think the new parts would be enough to throw off the AFRs, but it's possible you just need to have the fuel maps tweaked again. Especially if they are staying constant during a pull. Could just be that the ECU isn't putting in enough fuel? Was it worse or the same when you put in the stock ECU, MAF and injectors?

[PyR0NiAk]

A busted injector causing a lean issue would be spewing fuel into the engine bay. A busted injector causing a rich issue would be spewing fuel into the engine. I don't think you have an injector issue.

Well, I didn't think the new parts would be enough to throw off the AFRs, but it's possible you just need to have the fuel maps tweaked again. Especially if they are staying constant during a pull. Could just be that the ECU isn't putting in enough fuel? Was it worse or the same when you put in the stock ECU, MAF and injectors?

Would it be possible that they're busted in such a way that they're not spraying fuel at all?? Like, maybe he damaged the plug on them or something?

[Blown240sx]

Easy check to see if the injectors are working properly.

Pull rail and turn motor over with rail in a bucket or something so fuel doesnt go everywhere.

If your spray pattern looks fine then look for a leak right after the maf. Pull the intake pipe out and double check everything.
If the leak was on the boost side it would cause a rich condition.

[PyR0NiAk]

Easy check to see if the injectors are working properly.

Pull rail and turn motor over with rail in a bucket or something so fuel doesnt go everywhere.

If your spray pattern looks fine then look for a leak right after the maf. Pull the intake pipe out and double check everything.
If the leak was on the boost side it would cause a rich condition.

[cheap_sticker05]

Well guys, put the stock injectors back in today, I did test the fuel injectors in a pan before, they have a nice atomized fan pattern.
Stock injectors, stock mafs, and stock ecu didn't change a thing on the AEM gauge (read below)
Checked compression again on it again and its all around 150 still 2psi difference is the max.

I am freaking out a little that I am hurting the motor. I am trying to get some money together to take it to a dyno, because I hooked up a Innovate LC-1 and it shows I am super rich in boost ! both setups, but this stupid aem shows the opposite.
I called them on it, they had me do the test again, same thing, it shows my sensor is good, its calibrated in fresh air out of the car, and nothing. The dial on the back is set right. They don't want to warrant it so far though.

[Blown240sx]

Id go get another sensor. If its like the ones we use its just a standard VW Wideband sensor you can get for 40-50 bucks at your local parts store.

I believe its the Pre Cat 01-02 VW GTI 1.8T

[DeatschWerks]

Would it be possible that they're busted in such a way that they're not spraying fuel at all?? Like, maybe he damaged the plug on them or something?

Sure, if the injector is not spraying at all, it could be clogged to the point of failure or their is a coil issue.

[cheap_sticker05]

Okay, new development. I bought a new fuel pressure gauge to test it out again sine really this has to be something easy. When the pump prines I get 45psi, but right when it shuts off it drops back to zero pretty quick. Doesn't that mean the fpr is bad?
Finally a break through! Even though last time I checked this, it held steady at 45 for a long time.

[Blown240sx]

you need a gauge you can see while driving to monitor the FP while under load.

[cheap_sticker05]

yeah I ordered a sensor for my gauge. its been bad for a while.

[cheap_sticker05]

YAY! well the car isn't lean anymore. Found an injector leaking. Must have been from when I changed them again. Anyways, now the high idle is back. It starts and idles at 1500rpm, if I rev it it goes to 2k and stays. I did replace the iacv valve, and it does the same thing. If I squeeze the hose it screeches and idles right. So, the high idle issue is back but it runs right now.

[PyR0NiAk]

Congrats

[PyR0NiAk]

Maybe you busted an injector installing the rail into the mani... Injectors are really all you have left man...

Just want to add that I stated this earlier...

[cheap_sticker05]

Haha, yeah, I really didnt think it was an issue, I put plenty of grease on it I thought.

Now I just have to figure out my high idling issue = /

BTW- Thanks everyone for the help!

[PyR0NiAk]

I'm pretty sure you stated before, that you adjusted the idle... Adjust it back down..

[cheap_sticker05]

Yeah thats the problem now. Again. I was having this issue before any of the lean issue started. I bought a new iacv, it all the way down. Back out to boost leak test again. double check tps, timing, reset ecu, and see if this will fix it all.

[the converted]

You didn't accidental switch the fuel lines did you?

[PyR0NiAk]

If he switched his fuel lines, the car wouldn't be running a high idle..

[cheap_sticker05]

Wow, this is really weird. So tonight I drove the car around town. Leak tested prior to leaving, held 45psi til a vacuum line finally blew off. I put it at 30pai and it held for a long time. TPS is fine. IACV still seems like it flows way too much. I can squeeze it shut some and it will bring the idle back down where it should be.
So, after trying another mafs and ecu I tested from a friends car it acted the same. After driving it for a hour or so now the idle is at 1800 then goes to 2k then drops again and again. Usually that would mean a vacuum leak right? Well its not. I tested for leaks on a hot motor and still nothing.

Luckily a friend gave me a stock manifold, so I am going to install that in the morning and see what happens. Wish me luck!

[PyR0NiAk]

How about the port in the back of the manifold? That one's got a really weak fitting on it.

[cheap_sticker05]

Are you talking about the swivel fitting? If so, I replaced that because it was leaking a while back. I got a standard brass fitting that fits there.

[PyR0NiAk]

Where did you find a fitting that matched the threads?

[cheap_sticker05]

Amazon Hose and Fittings here in Orlando had one. I can't remember the thread pitch but I think it was 12x1.25.

[PyR0NiAk]

Yeah I know the pitch. Noone has it for a vacuum fitting though..

[cheap_sticker05]

Well guys, got the car fixed! Put the stock intake manifold back on. The Isis one had a bad casting on the iacv spot. I will post a pic later tonight, but half of the iacv ports if you are looking at the valve are suppose to be blocked to stop air from flowing unless the little piston opens. It was leaking air so it caused it to act like it was stuck open.s***.

[cheap_sticker05]

See how the left side curves out? that is what the issue has been all along.

[PyR0NiAk]

Shoot an email to [email protected]

[PyR0NiAk]

Shoot an email to [email protected]

[cheap_sticker05]

I talked to Kevin today. Should be getting sorted out. Just sucks I wasted so much time and money on things that didn't need replaced.