The problem has been found & fixed. Unfortunately no one got it right!!!

So what else should I be doing while I am tearing the top end apart? Are there other sensors, actuators, etc., which "while I am in there", I should replace, update or upgrade or even move somewhere else? Are there any special gaskets I should use or are re-useable if I need to crack it open again? I am a big fan of doing it once, and doing it right..... or for me its usually overkill. LOL!

On the EGR vacuum line, it looks like it was originally a hard plastic line vs a rubber line, where do I locate replacements? Is it best to find the original style or just fabricate my own?

Also, Does anyone know what size sensor socket I need to remove the oil pressure sensor next to the distributor? I tried two different 1&1/16" sensor tools but couldnt even get it down over the sensor so I am assuming its a 1&1/8th or larger size. I really dont want to pull the distributor, and I didnt have much luck trying to remove the wiper motor.

Thanks!

I also pulled off each injector's electrical connection one at a time and ran the engine after each was disconnected. My thought was that if it was a "bank fire" system and if one shorted then they may all be shorting. Unfortunately it didnt seem to make a difference at all.

Am I correct in thinking it has a bank fire fuel injection system instead of each injector firing individually?

So, should I fix the vacuum hose first and continue to check for other vacuum leaks to start with before i replace the injectors?

With the injectors being a problem, what else should I be doing while I have to dismantle a fair amount to get those replaced? What injectors do you recommend?

Well, if I am checking my injectors correctly for an Ohm reading here is what I got: 13.9, 13.3, 12.7, 16.3, 12.9, 16.3, 15.3, 12.6.

however, while I was on the injector near #1 cyl, I saw a little hose maybe 3mm wide broken. it was broke where two of these hoses come together to one. then the hose snakes down to the area in front of the drivers side tire. when I traced it the other direction, part of it snapped off in my hand and it went to the bottom of the intake plentum.

Vacuum leak? Plus injectors getting bad???

Well like an idiot I tried to replace the oil pressure sensor and of course broke the top of it in the process and still havent gotten it out as I cant find a tool to get down over the sensor to the base to remove it. So it's disconnected but not removed yet.

So I wasted a lot of time jacking with that and it still is running crappy.

However, I finally got a good FUEL pressure gauge and here is what I found: not running but key on = 40 psi / running at idle = 37-38 psi. While it still is trying to die, the pressure went up to 40psi just before it was about to die. When I hit the gas pedel it would idle again and pressure returned to 38psi. What do you think of the pressures?

I havent tried anything else, but will try to figure out how to check the ohms of the injectors next.

Ok, bets are open!

Got side tracked with one of my daughters trip to the hospital this morning.... things are looking ok on this front.

Should get a chance later today to try a few things and see what is going on.

Thanks again for everyone's help!!!
Brian

Ok after taking the advise I took a few days off to look at this in a new light. So today I finally got a chance to mess with the vette and here is what I have found out. Fuel pressure relay looks to be good as a new one made no effect when installed. All fuses are fine, gas is less than 2 weeks old. I had already installed a new ignition control module in the last few weeks, along with a new coil.

While I was checking and trying things today, I noticed that when I turned on the ignition key (but didnt start it)and listened to the pump activating, my fuel pressure would show 3 lbs. After it started it was showing around 60 lbs at an idle or rough idle. I dont recall but I didnt think my oil pressure was over 0 before startup and really didnt think it was over 40-45 at idle.

Therefore I pulled the connection off the oil pressure switch behind the distributor on the drivers side and started it. Oil pressure read 80 lbs but she seemed to run completely normal!

I am going to try this again and if it truely is running fine then I will go and replace the oil pressure switch and drive it a little bit. Keep your fingers crossed, & I will let you all know the final outcome soon.

Please dont take me wrong, I sincerely appreciate all the help and guideance!

I am just extreemely frustrated with trying to get this figured out, its compounded by not having the right tools, like a factory service manual.

Hopefully I can get some of the tools I need and test things to see what is happening. If not, I may just have to throw parts at it & see what happens.

Again, Sincere thanks!

CRAP! This is really maddening. I just went out & started & ran the dam vette for a minute or two, even though it was acting like it was missing and wouldnt build RPM much over 2k. In addition I heard the pump charging before I started it and again afterwards when I key'd on again to check.

This thing is so frigging frustrating I really dont know what the hell to do next......

I really dont see how the fuel injectors could be involved.....I dont have fuel pressure. If I had fuel pressure and it was running bad, then yes that would follow.

Thinking I might have a bad gauge is why I bought my own and left the gauge off the other end of the hose. This way I can actually see fuel flow, thus eliminating a clog in the line. With fuel flowing when pump charged and didnt flow when it didnt charge would lead me to believe its more likely a fuel pump relay, switch or what ever they are called.

Since my crapy Haynes manual doesnt show me where the fuel pump relay / switch is located or what it looks like, does anyone have a photo of this & where its located????

Sounds like a plan! Do you have a photo of what it looks like? I am not sure my Haynes manual will have a photo. Are there any special tricks to replacing it?

So a couple weeks ago my vette started running bad, like it was getting intermittant fuel. Got her home and is was as if she wasnt running on all cylinders. I felt it was the fuel pump after some diagnosis, so I ended up replacing the fuel pump with sock, and the fuel filter.

Afterwards, no difference in the way she ran. I hooked up a pressure gauge and no pressure. No pressure at key on or after when started. It would start but die shortly after unless I feathered the gas to keep it going.

Today I bought my own fuel pressure gauge and used the hose without the gauge on it to see if fuel would come out. The first time I turned on the key (but didnt start it) I could hear the pump running, and it gave fuel. So I tried it a couple more times, but the pump wouldnt cycle on. It made a clicking sound, but never the correct sound as it should.

So, should I be getting another pump or looking elsewhere?

Thanks!

Just wanted to give a "wave" to everyone.

I still have my 89 C4 coupe, 6speed, FX3, etc. My vette has been with me for 11-12 years and I even drove my wife to the hospital for delivery of our twins, 11 years ago this coming December! (obviously not back home!)

My vette is all stock (except for cat-back exhaust), since I originally bought it for SCCA autocrossing. After the twins, well that kinda got put on hold, plus I discovered the joys of the roadcourse!

Currently, I am having a little issue with the vette, but ideally I would like to start modifying her once I get that resolved.

Anyway, great forum & knowledgeable people, glad to be apart of it.

Brian