Hi all
Thought that I would share my experience of changing my fuel injectors with a set of Accel (stock) 19 lbers. What prompted the injector replacement was that my #8 got clogged and no gas was passing. The initial change went pretty smoothly, got the car taken apart, runners, plenium, fuel rail and all. When we got the fuel rail off the car...we looked into the injector bores and saw a "gell" like purple substance backed up around the #8 injector bore. We then tilted it so that we could see the tube running to the F/P regulator ...and that too had some of the weird gunk around the opening. We took a can of intake cleaner and cleaned as much of the rail...with litteral rocks falling out of it once the gunk reacted with the cleaner...

Once car was put back together...we started it up and it ran wonderfully--idle and smooth acceleration. Then after 40 minutes of driving...the car begain to miss badly AGAIN We lifted the #8 ignition wire off the distributor...and low and behold...#8 injector go clogged again. We then tore the sucker down again and found the same gunk on the inlet tip of injector #8. LESSON HEAR: We should have tore down the fuel rail, regulator and all the first time around. This time with the rail apart...we dissassembled the F/P regulator and found the source of the gunk. The inlet passage was completed blocked by the crud...and must have been loosened by the cleaner...only to have the debri break off and contaminate the same injector bore again... Kinda of like what happens with a piece of plaque breaks off and causes a heart attack in a person. OUCH. This time, with the car down for 1 1/2 weeks during this ordeal... Since the car has 230,000 original miles on original drive train and still running strong....I decided to go all out and replace a bunch of stuff.

Injectors w Fuel rail o rings replacments
F/P regulator
Dist cap/roter
AC Delco Plugs
New 8 MM Wires
Fuel Filter
Kragen MAF
MAF Power Relay and Burnoff Relay
Be Cool Hi-perf Thermostat
Radiator Cap
Coil
Air filters

all total $650 for parts and some back spasms

Still not sure what the heck the purple crud in the rail was.... I am suspecting bad Mobil/Texico gas.. I now only use Unical 76 or Chevron Techron. My old 0-60 times were 8.3 sec range...my first attempt with a stop watch nailed a 7.0 and that was with a limp/conservative launch. I am suspecting that I could score into the high 6 sec range...and that's with a 230,000 mile TPI 305. Stock except for the air foil.

 

good grief!

I sure hope you flushed the fuel lines and looked at what came out when you changed the filter. *** knows what purple stuff could be but if it got through a filter, hopefully its not something purple that someone stuck in your tank.

 

Initially we thought that the "miss" was a clogged fuel filter...so we replaced the fuel filter right before doing any of the injector work.... thus the filter was brand new. When the car clogged after the injector replacement...we thougtht that it might have been a extremely dirty gas tank (I even considered replacing the tank itself). We removed the filter and cut into it to find it brand spanking new with no debri ...thus we ruled out a dirty tank and/or any foul play. Good thought thou.

I was using RED LINE F/I cleaner consistantly. Coicidently I had dropped a bottle of Chevron Techron Fuel System cleaner in the tank after the car had already started missing...thus I can't attribute this to the cleaner...BUT it is possible that the cleaners might have reacted to eachother chemically???? Techron and Redline no licky eachother??? I did see the Purple stuff react strangly with the F/I Spray cleaner that we used on the fuel rail...it instally changed color (white) and solidified into little "sandy" tecture--like rocks.... It was magic