Hi , just new on here im 68 years young so had a bit of trouble working out the computer , we be needing help on a few few issues as my partner Mary and i just brought 1994 Z28 LT1 350 auto we live in Sydney Australia , first question is the fuel gauge needle on the dashboard is stuck right around way pass full , and the 2nd question this car has been converted to right hand drive steering doe,s model have a OBD scan port under the dash or elsewhere as she,s like not running very well sounds like a 5 cylinder V8 and vibrate very low power , car has been serviced in its life ,pulled spark plugs from left bank seemed all good and quite very new looking NGK iridium TR55 gap was 0.057" ,on left bank i installed conventional NGK TR55 gaped down to 0.040" just till i get her sorted have to do right bank on the weekend a bit more of a tighter area not elbow much room , any help would be great as we also have a 1988 Corvette with a bit of work do to her engine but she has a bit more elbow room under the bonnet , im very keen to make this Z28 a very good car ,thank you Bob

 

Yes you should have a OBD port. Originally it would have been on the left had side. right near you right knee if you where driving.
Google "Where is the OBD port on a 1994 Camaro" and click on images.

You need that port, there is a reason GM put those ports on all EFI cars. Even the best tech needs information to give them an idea of what is going on. The only other option is to just throw parts at it. Since you just bought the car it is worth it you replace normal wear items so you have a starting point for preventive maintenance (plugs wires, filters) but I would want the car running right before doing that. After saying that, a bad MAF sensor can cause the plugs and O2's to foul. Replacing the the O2s and plug may make the car run better but only for a short time and you may have to replace the O2's again if they get fouled bad enough. It is always best to not through parts at it. On out example lets say you get lucky and you replace the MAF sensor first thing. But the car does not run better because of the fouled plugs and O2. You put your original MAF back on because you are sure that was not the issue. If you replace the MAF and the plugs at the same time maybe the MAF is the fix but you cracked a plug when replacing it. And so on. The example I gave is just a random issue you could just as easily have in issue with the Opti spark.

A fuel gage is a simple circuit. You disconnect the wire at the tank and the gage will max out one way, you connect that wire to ground it will max out the other way. Difference manufactures switch which way it works. I always forget which is which on any given car. But you have either a broken wire or a shorted wire or a bad sending unit. It could be a bad gage also but that would be the most rare failure. Camaros are a pain to get at the connector at the top of the tank. You can cut a hatch in the floor, Assuming there is not one already. First test I like to do is pull that wire and see if it changes then ground the wire and see if it goes to the other direction. Then I will check to see if there is any power or ground in that wire with a multi meter. or a smart test light

 

here is a link to shbox its a great site with mass info on 4th gen z28's when I first got into working on mine I spent a couple days reading in it and others, 4th Gen LT1 F-Body Tech Aids

 

i have to thank you for your help , i have brought a Haynes manual looking at it to get the fuel sender unit out its part of the fuel pump assembly and the diff needs to be dropped out and the mufflers also before dropping the fuel tank if it is like this then i maybe best to cut a hole in the floor ,what would be the best way do you think i would feel guilty if i weakened the body in anyway , i be looking for the OBD port on the weekend do you know what type of scanner we will need thanks Bob

 

thank you Gorn and thank you Craby

 

go here and download factory service manual for your year. http://www.mediafire.com/?40mfgeoe4ctti

 

making the hatch to change pump is easier then taking tank out. getting that tank out and especially in, is a pain in the as@

 

thanks hatch it is , haveagreatweekend