i just put the car on the road friday and i was driving around all day. it was soo nice out and she was runnin strong no problems nothin at all. come night time i was gona go with my friends to where all these ppl meet up to race and right befor we went to go the car just shuts off.... started it back up took it around the block and just starts buckin and dies... i didnt go to the races i just sat and waited for my friend to show up with his scanner. plugged it in and it said it couldnt comunicate with the car. its a $4000 snap on scanner so its not the scanner [EDIT] up. started it up ad drove to my gf house with no problems. woke up, drove to my buds shop to give him a hand and no problems there. got food at deli tryd going to car quest to get a light socket for my blinker and it shuts off again. idk what it could be. idle air control? fuel pump? alternater? idk.... what do u guys think. thanks in advance!

 

On your 93' you can flash the trouble codes thru the SES light. See this DIY from Shbox:

Start here and get the codes it's thowing first - if any.

 

Wouldn't hurt to check your fuel pressure either. Intermittent no start/start conditions could be caused by a failing fuel pump.

 

Well I'm pretty sure a 93 lt1 is supposed to have 43.5 psi but my injecters are from a 96 so there a lil bigger. Idk if thatl change the pressure and stuff. My fuel pump is kinda loud from inside the car idk if that means its going bad. The tb is a from a 96 also. I know the car needs to be tuned cus of that stuff but it ran the whole day fine and all last summer. I was thinking of getting a 94-95 computer and harness cus the previous owner didn't make kinda a mess of everything and 93 computers suck. Is that a good idea? And thanks dave I didn't know I could do that. I'm gona try that when I get home from work.

 

Your injectors shouldn't matter as if your fuel pump is good you should still ready 43.5 at the rail (with the vac line off). However, you do need to have your car tuned for larger injectors if they are larger as I know the 95' was 24#er's but not sure about the stock size of 93'. As to the computer, if you go this route it is simply not plug and play as the wiring harness is different and 2 things I know are different are the 94 and up are MAF controlled and not Speed Density and also the injectors on 93's are batch fire and not sequential. Keep us posted if you get any codes from the flash procedure above.

 

93's are 22#/hr, 94+ are 24#/hr. That's rated. not actual. I would think the PCM could compensate for the difference in flow.

I think the connections, as well as the motor itself, on the IAC is different 93 v 96.

 

The ignition switch can do funny things, try this:

http://shbox.com/ignsw/ign_switch_repl.html

 

You don't need a tune for a 96 throttle body. They are identical to the 93 TB, only lacking the TV cable connection for the 93's 4L60 trans. And as Bruce already noted, the harness connector and the IAC motor are different. But that's not a tuning issue - that's a wiring issue.

The size of the injectors does not change the required fuel pressure. While the 93 and the 96 injectors are a different size (#/HR) as noted above, they are both flow rated at 43.5psi. The small difference in size can be accommodated by the long term fuel corrections in closed loop (part throttle), but when you go WOT, its going to be running rich.

Odd.... I explained that to you when you posted on the Advanced Tech forum.

If you look back over his earlier threads, you will see that there are numerous posts dealing with major wiring problems in the car, and in particular, major problems with the ignition switch. Apparently it's still causing problems.

 

Wow.... You are right u did explain that in advanced tech "-You can scan your 93 for codes with a paper clip, you don't need a $4,000 Snap-On scanner. Sounds like a problem with the Opti (would set a code, but not turn on the SES light), or the ignition switch.

Repost on the correct forum." Let's just say my car was in front of me right now and I have a paper clip in my hand... Now what? I don't know what to do with it. And dave showed me something that explained it.

And yea I posted a bunch of threads about wiring but nothing that really helped much at all. all my problems we're abs blinkers defrosters brake lights ect.. And I spent a long time figureing everything out myself cus I couldn't get much advise from anyone else. And good news for me!! I fixed all that. This is my first lt1 car and its a learning experience. I work 12 hours a day 5 days a week so I don't have much time to mess with the car so I use this site to learn to get an idea of what I should look for and where to start and what I should know. I appreciate your help I honestly do. But I don't appreciate the way u seem to be putting me down. But w.e. All the wires that we're hanging, all the plugs that wer hanging we're fixed and put back together. All that's done and out of the way.

 

You should relax. Everybody works a lot. I can tell you from experience that people don't like to post the same thing twice. So, if you get advice and don't understand it, ask for clarification. You won't get put down for that like you would if it appears you just didn't listen the first time.

Also remember that everyone on here is working from the information you provide to get to the answer you need. Incomplete or erroneous information will likely yield answers that aren't what you want. Tell people what you've done and what the situation is at the time of the incident. Remember, their inability to solve your problem is your fault, not theirs. There are a lot of knowledgeable people on here and a few very knowledgeable ones. Listen them all and sort out the answers that don't apply.

You might also want to read two websites for information and bookmark them both. First would be ShoeBox's site www.shbox.com It has a lot of information and how-to's and is very well illustrated. The second is Injuneer's site, www.Injuneer.com. There are technical articles that cover a lot of F-body specific items as well as providing information on scanners and scanning. If every new member would just read these two websites there would be a lot fewer posts...it's all right there.

Anyway, tell us exactly what is going on and what you've done so far. Tell us what the paper clip tells you...

 

Ok. Here is the whole history on the car. My good friend bought the car when we we're in 8th grade. He got it for $700 cus it had a blown motor. The car only had 83k on it. They started the motor so everything worked. They never checked to see if the blinkers, brake lights ect worked. The car sat for 3 years under a cover in the driveway. He brought it to tech and painted it. The car sat in his garage for almost 2 years. He bought a 96 trans am that had a blown automatic trany. we ripped the car apart and the car only had 86k ok it. We put new head gaskets in it and threw it in his camaro. Put the 93 intake manifold on it put the 6sp trany in put the trans am interior in it.put the 93 computer and harness in it. Tryd starting it and no fire. Would start with starter fluid found out injecters we're screwed. Put the 96 injecters in and it fired right up. Then notice blinkers abs tail lights ect we're screwed but he put it on the road anyway. Drove the whole summer with no problem. Winter comes, he takes it off the road, he buys a 3.73 rear we put it in. Put new opti, plugs and msd wires in it. Car still ran like a charm. Then he put the 96 throttle body on it (idk why) car still had no problems. I would drive it all over his neighborhood all the time. He wanted to buy a bike cus he couldn't figure out the wiring for the abs and lights and stuff so he sold it to me for 1800. I put the wires that we're cut back together. A plug that goes to the ignition switch wasn't connected, I put that back it. Another plug that went to something that I don't remember. (All that was done by the original owner.) I put the car on the road and it ran like a dream. Then around 10:30 it starts actin up. Stalling, bucking, idling weird. My temp gauge doesn't work so I let the car sit for a hour and a half. Started it up and idled high like 2k, shut it off. Started it idled good. Idled for 2 min and died.

That's everything. P.s. Check engine light has always bin on and every scanner ever hooked up couldn't communicate with it.

 

Holy crap. Stick a paper clip in it.

 

I'm NOT putting you down. I'm making others aware of the condition of your car AS YOU PREVIOUSLY REPORTED IT.... including the fact that one of the problems (which you conveniently failed to include in the list above) was the igntion switch. Knowing that, people might be able to help you easier.

But you don't seem to really appreciate my help, so I'll leave you alone, except to continue to monitor for posting on the wrong forums, and testing the language filter.

Good luck!!

PS: I work 11 hours a day 5 days a week, and a 1/2 day on Saturday. Yet I still find time to come here and help out.

 

I got home and drove to pick up my girlfriend and it didn't give me any problems. It idled at like 2k when I started it and I let it run like that for like 30 seconds. Started it again and it was going between a grand and 1500. We went back to my house and I stuck a paper clip in it and I got:

15- coolant sensor circuit. (Low temp indicated)
21- TPS circuit. (Signal voltage high) I'm guessing that would be the reason its idling high.
36- distributor ignition system
42- ignition control circuit

The car doesn't act up when I drive slow and steady and really really baby it it doesn't act up but when I get on it a lil bit itl buck and stall no matter how I drive it, grandma or wheelman it don't wana go lol.

 

I thought I blew my engine on my 93,had it towed,come to find out,it was the map sensor.It's that little black thing on top of the intake manifold.hope this helps.