About ready for hammer action (HELP)

[tooez]

Have you ever wanted to take a hammer and just start smashing windows and plenum and runners.

This is what I have did to the car and no start.
New fuel pump
New fuel filter
New fuel pressure regulator
New fuel relay
ohmed all injectors (16ohms)
took low amp bulb just to see if any pulse. (yes)

Fuel pressure is between 46lbs and 48lbs. Still drops off after I stop cranking. It never hits a lick. Use starter fluid and starts right up and dies.

I'm so lost and mad. I spent everthing I have on this car. Car ran perfect befor I tore it down for paint.

Should I hear the injectors when the key is turned on or while I crank. Thanks.

 

[toptechx6]

Pull the pump back out of the tank and inspect the short rubber hose for leaks, good luck.

 

[gmjunkie]

Check All fuses in fuse panel,especially FP1,FP2 if so equipped and the fusible links behind the battery!!

 

[tooez]

Hey gmjunkie,

The vette is a 90. Their is 5 or 6 fusible links behind the battery. One ie by it's self and runs toward the back of the car in rocker panel. I checked that one and is ok. The others are coming from a square box.

Just a shot in the dark. Is their any thing that would stop the injectors from pumping fuel. If I have fuel to the fuel rail but not getting to the engine. All the injectors ohm at 16. Is their a relay for the injectors or does the computer send palse straight to injectors. Or is their any thing else that controns the injectors. Thanks for any help.

 

[tooez]

One more thing. Can it be a vacuum problem. I can't feel any vacuum at all from none of the lines while cranking.

 

[Paul Higg]

Do you have an FSM? Any codes?

I will look in my 94's FSM right NOW to see the description and operation of the injectors and get right back to you. BEFORE you take a hammer to your car, I will gladly hire a flatbed and take it off your hands as I live in Atlanta, not too far away <grin>.

With the help of the guys on this forum, ESPECIALLY Junk and Tom94 you WILL get it running again

Paul

 

[Paul Higg]

So far I have noticed the FEDS (Fuel Enable Data Stream) is in the system which is part of the security system. If enabled correctly through a password system between the PCM (LT1) and ECM, (LT5) and the CCM, it will allow fuel delivery to the engine. IF you have a problem with it it will give a DTC code 54 which is diagnosed in section 8D of the FSM. But, since you said you have fuel at the rail, I am not sure if that might be the problem. Again, look for codes. I am still looking into the injectors and will get back to you in a few minutes.

Paul

 

[tooez]

This where I'm at. I took the fuel rail off and then turn the car over and no fuel coming from the injectors. Their dry. so that is telling me that it something not telling the injectors to spray fuel.

This is what I have did to the car and no start.
New fuel pump
New fuel filter
New fuel pressure regulator
New fuel relay
ohmed all injectors (16ohms)
took low amp bulb just to see if any pulse. (yes)
I put a small hose and clamps and put inplace of the Fuel Pump Pulsator.

Thanks

 

[Paul Higg]

Ohm value is good. And if your getting good pressure at the rail you must have a wascally ewectical prwobem. My Bugy Bunny imitation. Sorry.

I am presently perusing what controls the injectors electrically. I will get back to you ASAP as I live for these kinds of problems.

Paul

 

[tooez]

thanks

 

[Paul Higg]

toez, do you have an LT1 or an LT5, VIN J or P?

 

[tooez]

I wish. But it's a l98. the vette is 1990.

 

[Paul Higg]

One more question, do you have an FSM?

 

[tooez]

FSM?
I don't know what that is.

 

[Paul Higg]

It is a Factory Service Manual and if you plan on keeping your Vette I would HIGHLY recommend getting one. You can get them from E-Bay, Davies Corvette, and many other sources. I am looking in mine now, and although I have an LT1 and am not familiar with an L98 I am only looking into troubleshooting the electrical components involved in powering the injectors. So far from what I have read it looks like an electrical problem but I have to look in the wiring diagrams. I will report back to you as SOON as I find anything. Like I said, I LIVE for this.

 

[tooez]

Man I'm so lost. I'm going to order a manual for it monday.

 

[Paul Higg]

Good, I am replying to you now. Do NOT give up hope!!!

 

[Paul Higg]

Okay, without the FSM for your car it is a little difficult for me to troubleshoot. But mine has 8 separate Injector control circuits in the PCM and ditto for the ECM. Now, I doubt very much that all 8 or even 16 of those circuits have gone bad.

Do you know how to pull DTC (Diagnostic Trouble Codes) for your car? If not then you will find out how if you do a search here in the forum.

Having said that however, I do think you have a main electrical failure. It would seem Junk was correct in his assessment that you may have a fault in a fusible link (which is a fuse soldered inline in the wiring itself) or a bad 10 amp fuse. My car has two 10 amp fuses, one for half the injectors and the other for the other half.

If the fuses are good then you need to start looking for grounds. A simple electrical circuit needs power and ground. Not unlike your light switch to your kitchen light. If you have a bad fuse you have an open, if it is shorted to ground you have a short. I WISH I had the FSM for your car, I could tell you EXACTLY where to go and look for power. I will be willing to bet ANYTHING it is something VERY simple. No power!

I know there is very little room in that engine compartment, but if you take an injector plug and follow it back you will arrive at a fusible link somewhere along the line. They are usually buried in the harness, that is IF your car has them.

Now, when was the last time it DID start. What did you do to change things? I would check every darned fuse in passenger compartment and then the engine compartment if I had to. If you still have an owner's manual it will tell you where ALL of them are.

My money is on a fried fuse.

Do NOT give up, start another thread asking for locations of fuses and links for your engine and list your engine by name. L98. You WILL get help.

Once you understand how it works it will all seem so easy.

 

[tooez]

I really want to thank you for all the help. I'm going to eat then I'm going check every fusable link I can find. I changed both fuses in the fuse box. I'm not getting any codes.

How I got to this point. I took the plenum and runners off the car to have them polished while painting the car. Well 2 years later I am ready for the car to be put back together. Got it together and now no start. The car ran perfect the day I park it. Was at the track and was running 8.90 in the 1/8 mile. One day I hooked the battery up so I could pop the hatch and for got to unhook it. Well a couple days later I was in the garage and heard my car clicking under the passenger side dash. Know the cars back together no clicking at all.

Thanks for all help.

 

[Paul Higg]

Don't tell me the battery was out for TWO YEARS! Do you think you may have a bad battery?

You probably heard relays clicking and starved for juice. Do you have a good battery now?

Like I said, check EVERY fuse in that car, ALL of them, even innocuous ones as they feed multiple circuits. You may be surprised at how many you find fried!