Hey guys!

I've pretty much given up here. I've got a 90 speed density TPI setup installed on a regular old 350. The chip is a stock AUJP bin with VATS, EGR, and AIR disabled. The ECM doesn't throw any codes, and does the quick little blip on key on to indicate it has read the prom.

Fuel pump is providing 40 PSI of fuel pressure (confirmed with a pressure gauge) to the stock 22 lb injectors. My injectors are getting 12 volts, and pulse while cranking the engine. As far as I can tell, I am getting all the fuel the engine should need to start.

The compression is 120, plus or minus 2 points on every cylinder, which is typical of a low compression mid 80s 350 that this injection system is installed on.

Ignition is set at 6 degrees before top dead center, as confirmed with my timing light while cranking the engine. All 8 cylinders have a hot blue spark, with brand new fresh AC Delco plugs gapped at .045"

TPS reads .54 volts, and both the TPS and IAT read within a few degrees of the actual atmosphere temperatures. IAC is brand new, and the passage is clean. EGR has a block off plate, and the AIR lines / smog pump have been removed, with the holes on the manifolds plugged off. O2 sensor is brand new.

I've literally replaced absolutely everything on this engine over the past two years in my attempt to get the thing working properly. I know my wiring is correct, I've gone over everything dozens of times.

The engine used to start quite well, and run very well, with crisp throttle response. My only problem was that it idled very richly due to my camshaft, which is a Comp Cams XE262-H, lsa of 110. It began to run poorer and poorer as time went on, until it finally died all together, and won't even so much as sputter.

I gave up on it, and parked the truck for a few months until I got over my frustration, and tried again over the past few days. In the past few days I've tested the distributor in another TBI truck I have, and it worked flawlessly, I tested the coil in the other TBI truck as well, again, worked perfectly. I replaced the injectors, incase the 24 lb/hr injectors I had in it before were going static, or were stuck shut, replaced the plugs, and tried the 02 sensor from the TBI truck as well.

The plugs come out of the holes soaking wet with gas, and the exhaust smells very strongly of gasoline as well. The plugs spark hot blue if you pull them out and put them against the manifold. Infact, I had one ignite the fuel that was in the cylinder through the open hole, making quite a pop.

When the plugs are install, and the wires are hooked up, it doesn't even so much as make a sputter while cranking, even if you hold the pedal all the way down to stop the truck from firing the injectors.

Does anyone here have any suggestions as to what may have gone wrong?

 

does your car (truck) start at all? if so or not, what do you hear? is it turning over?

 

Nope, truck doesn't even try to start. The engine cranks fine, the injectors pulse, and it appears to have spark. Just no attempt to fire...