Dante93GTZ

iTrader: (5)

EDIT: I've been doing some testing today and am still not getting fuel. Last night, I didn't think I was getting pressure (see below), however I put a gauge on it today and am getting 42-43 lbs of fuel pressure at the rail. It bleeds down to 40-41 when the key is off, but I assume that's within tolerance. I checked voltage at the injectors and there is 12V present. I also checked the pulses with a Noid Light Kit and everything pulsed just fine. The car will start up with a shot of starting fluid, but isn't getting an fuel inside the engine via the injectors. I have ruled out VATS as a problem because obviously the starter works and I'm getting injector pulses.

ANY OTHER IDEAS??? CAN THE INJECTORS JUST BE SO BAD THAT NONE OF THEM WILL SQUIRT?? With as bad as the tank looked, I supposed it's possible that the injector fuel inlets are just clogged completely... But EVERY single one? The car isn't even attempting to catch at all.







I've been working on getting my 91 Formula (L98) running. I bought it without a fuel pump/sending unit - The inside of the tank looked like Halloween it was so badly rusted. In fact, when I emptied the tank, I threw the gallon or two of gas into the street (thinking it would spread and dissipate/evaporate) and it hasn't - In fact, there's a big, smelly stain on the road now. Even after the hard rains we had, it's still there 5 days later. Just to give you an idea of the condition of the fuel prior to me getting the car.

I replaced the tank, sending unit, fuel filter, and fuel pump. I removed the fuel lines at the fuel rail and blew compressed air through them to burp any residual rust. Before you ask, yes, the new components were tested prior to installation. I also primed the fuel pump before reconnecting the fuel rail to ensure that clean, new gas was coming out the lines. It was.


Anyway, I'm not getting fuel currently. I checked the injector bank fuses and both were fine. I jumped pins 1&2 on the ALDL and just get the code 12. I also checked to ensure that the security light went off (it does, so I assume VATS is either disabled or working properly).

Next I tried to determine if I had pressure at the fuel rail. I turned the key on, heard the pump prime and depressed the valve on the test port on the fuel rail. Just a dribble came out and it was semi-orange/yellow. It definitely didn't look like clean gas. I expect that there was some rusty gas in the lines as the rest of the lines looked this way too. How likely is it that my fuel rails are just clogged? I pulled the first plug on the D/S and it looked new (just installed 'em) and didn't smell of gas at all.

Any advice would be greatly appreciated. I am thinking I may just pull the rail off tomorrow and see if I can get air to pass through it.

Dante93GTZ

iTrader: (5)

Anyone?

JustCruzin

Might want to ckeck the filter again, a lot of crud could have came loose with the new gas, Blow the rails but IMO it sounds like a VAT problem, worth checking out.

Dante93GTZ

iTrader: (5)

[removed because we've confirmed it's not VATS]

Dante93GTZ

iTrader: (5)

BUMP - New info at the top.

old z mzn

iTrader: (1)

ohm your injectors

Dante93GTZ

iTrader: (5)

I do still need to do that, but I stumbled upon a way to test the wiring - in car.

The car came with a brand new (1) fuel injector - The previous owner thought #8 was bad - I'm not convinced that all of them weren't bad.

First, watch this video:
http://www.youtube.com/watch?v=7aT4S...eature=related

I used his basic method, and modified it for my situation. Since I had a single, new injector, I simply used the syringe and put in on the rail side of the injector and pressurized it with some intake/carb cleaner (similar to the video). I unplugged one of the injectors on the car and plugged that harness plug onto my new injector (still pressurized with the syringe, straw, carb cleaner). Then I attempted to start the car and sure enough, the cleaner sprayed out of the new fuel injector, which told me that everything on the car side was working perfectly and confirmed that my Multec injectors simply aren’t spraying at all!

I ordered some injectors this afternoon - Hopefully they'll be here Monday and I can finally get this thing running!

old z mzn

iTrader: (1)

good way to test for leaky injectors ...probably are bad ....good luck

turbo_jimi

I've seen this a couple of times...check your spark plugs for fuel saturation. Either way you may want to change them.

Dante93GTZ

iTrader: (5)

Plugs are new; I did remove a few and short of the little bit of starting fluid I sprayed to start the engine, they show no signs of gasoline at all.

I used the above mentioned vid to make a very crude ON CAR injection pulse test. Let me give you some info first....

Since I had good pressure, had 12V at the injectors and saw pulsing with my noid lights I was pretty sure my injectors were bad, although it seems strange that none of them were spraying... I posted the picture of inside my old fuel tank to give people an idea of just how bad the fuel system was. On top of that, the car had sat for 3-4 years. Based on that, I would say that it's not out of the realm of possibility for all 8 fuel injectors to fail to spray... Unlikely, probably, but impossible, I doubt it.

ANYWAY. Here's my ******* test. Since all of my other testing to this point had told me that everything up to the injectors is working, I wanted to 100% confirm that the system/electronics were indeed working, so I filmed this:

http://www.youtube.com/watch?v=ZXdYu03-Rpc

Don't flame me on the video. Yes, it's a crude video and my method isn't flashy, but it did prove that a BRAND NEW fuel injector (I happened to have a single), worked fine and sprayed/pulsed properly on the car. Using the intake cleaner as both a liquid and pressurized source, it mirrored fuel pressure in the rail.

I did the same test on my old injectors (stock Multecs) after removing them last night and sure enough, nothing sprayed out of any of them. VERY odd, but true. So, it would appear that either (a) the old injectors were badly clogged, or (b) they simply died over time sitting.

-Dante

Chevy_Chris1972

not sure if anyone still reads this post but I have the same exact problem with my car. Mine was running fine though, driven every day. Got gas one morning started up and left the gas station got a mile down the road and the engine just died as if it ran out of gas. I thought the same thing... Damn my fuel pump just took a crap. Heh if it were only this easy. I have 45psi fuel pressure, noid light pulses on engine crank, spark plugs are dry for the amount of cranking I've been doing. Replaced cap & rotor just because - they were old anyway. I pulled the fuel rail and cranked the engine and it don't seem to be spraying any fuel at all. Scratching my head - thinking can ALL 8 injectors crap out at the same time? seems VERY highly unlikely. Ohmed every one of them and they are all at about 10-13 ohms. SO... got fuel (to the rail) spark, compression, air, just wont run!!! My question is to the original poster, what was the final outcome of your situation. Did you ever get your car running and if so, what did you end up doing. I appreciate your help!