Borsty

iTrader: (2)

Ok, first off I looked around a little and didn't find much that fit my situation without spending longer then 45 mins searching I haven't been on here much but have been a member for over a decade so I'm far from new around here.

Anywho, here is a breakdown of what I had/have/whatever etc.:

Circa 2005 (yeah I know forever ago) I took out the LO3 TBI to put a brand new GM 350 HO crate engine in my 89 Trans am. I replaced the TBI with brand new 2" bore model and with the 454 injectors (96PPH I believe) Everything touching this engine is Brand new and never been fired. Being young dumb and not seeing how these projects can go overbudget by a ton I ran out of money. After that I joined the Army, car went to storage blah, blah, blah.

Fast forward 8 years I have the time/money/etc to get this thing going. Here's the current situation I just got the entire car done bodywork and paint wise I still have a great amount of work to redo the interior, brakes and suspension. Being so long I really fell out of the loop as far as the in's and outs of TBI's go.

My issue is, The injectors are not spraying and I cannot get the car started. I have spark and fuel to the injector pod, but not that little spray its supposed to give on start up. I believe its some electrical problem with the injectors.

My questions are:
-What sensors/relays/etc will stop the injectors from firing?
-Can injectors go bad from sitting so long? (8 years)

I would rather solve this issue and use the TBI instead of converting it to carb, which will be my last resort.

Any and all comments/answers/etc will be appreciated, thanks so much.

Schurkey

Put a TreasureYard TBI unit on my K1500 trying to fix a lean condition at highway speed. While changing the TBI did not fix the lean code, (turned out to be a defective O2 sensor) I did experience very rough idle when I tried to run the engine right after swapping the throttle bodies. One injector wouldn't spray. The other did, so four cylinders ran, and four didn't. I swapped the electrical connectors, and...the same injector sprayed, and the same injector didn't spray. Clearly not an electrical or harness problem. The damn injector was stuck.

Ran the engine about four minutes, and "poof" the injector begins spraying like it should. I guess the old gasoline had stuck the injector; and it took awhile for the thing to begin working again.

Do you have power to the injectors? The computer controls the ground side of the circuit. Fifteen minutes and a "noid light" will tell you if there's an electrical problem.

Borsty

iTrader: (2)

That is my next thing I was going to make sure of, The car just got delivered Saturday from the painter and the battery was dead and didn't have time to mess around with it yet.

Lynn1990IRocZ

First thing id do is get some noid lights and check to see if the circuit to the injectors is working, this will help a lot...after sitting a few years it is possible that the injectors could be stuck

Borsty

iTrader: (2)

Any suggestions in which brand? I found these one summit

http://www.summitracing.com/parts/wm...Fc5xOgodiAUAZw

Never used them before so I'm unsure of what to buy.

Lynn1990IRocZ

yea that's actually a really good price, you need one specifically that fit gm tbi harness, you can get them at autozone or bout any part store and can look at them to make sure that it has the light to fit a gm tbi harness

Borsty

iTrader: (2)

Ok so I finally after the long Buffalo winter (it was rough this year lol) I got the noid lights on and yes they are getting power. So does this mean I have stuck injectors?

Bigfoottpi11

First of all ,those injectors are way too big. You need to use 65lb injectors, you need 350 ESC unit, 350 Knock sensor and a chip from an 89' Caprice cop car for it to run .

1991sleeper

iTrader: (-3)

What the last guy said.. those injectors are way too big unless our gonna b making 500+ HP ... also the only way u can run those injectors is with a vaccum reference fuel pressure regulator like the aeromotive 13301 I believe is the part # .. then u have to delete the factory regulator ... also a custom chip will b needed if u want it to perform to its capabilities .. any more ? U have about TBI just let me know ... oh and I have a set of stock 350 injectors 40$ shipped ... I'm running a 370+ HP 305 TBI and I use cfm tech flow matched 68#ers at 28psi fuel pressure with the above mentioned regulator

91' bird 305 TBI T-5, trick flow heads, 4.10 gears, full UMI setup, track times coming soon!

Fast355

iTrader: (2)

454 injectors at stock fuel pressure will feed the engine just fine and still idle well. Its all in the tuning.

1991sleeper

iTrader: (-3)

Correct but I don't c any mentioning of tunning at all .. I'm assuming he is running a stock tune

91' bird 305 TBI T-5, trick flow heads, 4.10 gears, full UMI setup, track times coming soon!

Borsty

iTrader: (2)

I appreciate the critiques I sincerely do, but nothing said is actually answering my question "if I have power to the injectors and fuel to the pod, does that mean I have bad injectors?"

I have a custom burnt eprom chip as well.

Schurkey

The 'noid light is flashing, right? You seem to have power AND GROUND to the injectors.

If you have fuel pressure to the TBI body, power and ground at the injector connector--and still no spray--you've got plugged or defective injectors.

Borsty

iTrader: (2)

Yup noid light flashes and fuel is going to the pod (I actually took the line off and stuck it in a water bottle and primed it) but no spray.

I took the injectors off yesterday and have them soaking in carb cleaner right now. In a few days I'll throw em back on and update you guys, hopefully with good news lol.

Fast355

iTrader: (2)

Some of them like to stick. If you a spare set if hands and an unlit propane torch, you can get the engine to idle on the propane injected throght the pcv hose and tap on the injector housing with the handle end of a screwdriver. Tapping on a stuck inkector with yhe engine runnimg and electricity energizing the coil usually frees them.