Ok, I swapped my 92 305 TBI into my 87 camaro. We finally got everything hooked up and went to start the car. It fired up but wouldn't stay running by itself, and would die almost imediatly. If I kept giving it gas it would run but not well at all, and the car actually sounds like it has this huge cam, because its loping really bad. The only thing I don't have finished is my exhaust, it stops at the y pipe, but I don't think that should make the car run so bad. It does shoot a bunch of crap out the end of the y pipe though, but I don't know if thats normal since I don't have a cat or catback hooked up. Does anybody have any suggestions on what I should check?

Oh could having vacuum hoses not hooked up correctly cause this? There is this fitting in the rear of my intake, near the dist. that has a short rubber hose attached to it and then at the end of the rubber hose is some kind of valve or fitting with 2 vacuum ports on it. Can somebody tell me which 2 vacuum lines connect into that?

 

Just wondering,What fuel pump are you using?

 

forst check teh fuel pressure. the factory suggested range is 9-12 psi. if you can put it at 10-11psi you should be in really good shape.
then check to make sure the base timing is set at 0degrees with the brown wire unplugged. with teh wire plugged in it will prolly read about 5-7degrees at idle.
make sure your tps is connected correctly. not to be insulting, it's jsut that we made that mistake when we did jprevosts motor swap.
withteh vacuum lines you need the one that goes up to the MAP sensor to be connected. all the other ones should be fine as long as they aren't leaking.

hope this helps

later
tim

 

Is he running a fuel pump for throttle body in the tank or and outside pump?The car is an 87.I had a 83 cross-fire and the fuel pump in the tank died and I put an inline that didn't work to well.Didn't and 87 carb have a fuel on the side of the block,or am I wrong?

 

Thanks for the replys. My map is hooked up correctly, but the other vacuum hoses I just put where I thought they went based on lengths. I will have to check my timing, that is something I didn't do yet. When I switched over to TBI, I took down my tank and put a brand new TBI pump in. The injectors look to be working just fine, and both seem to be putting out the same amount of fuel. Its a little hard for me to tell how well it runs since my exhaust ends at the y pipe. A good bit of smoke is coming out but I am not sure if thats normal since I don't have a cat or catback installed. Its pretty strange because this motor ran real good in my RS, and now it sounds almost like its running on 7 cylinders.

 

here is the vacuum diagrams for the 305 TBI auto and manual trans
sounds to me like you have the vacuums hooked up wrong, if I'm not mistaken the vacuum on the back of the TBI should go to the MAP sensor not the EGR solenoid (the small sensor with 2 vacuums going into it. I hope this diagram helps

 

sorry that last one was pretty small

 

hey thanks a lot for the diagrams. I will have to check that out this weekend, the strange thing is when I pulled the motor from the 92 I am pretty sure the map sensor was still connected, but I did have a bunch of other hoses that I had to remove. I sure hope its something simple

 

anytime, I hope you have better luck with yours than I'm having with mine

 

It is in the tank. I just had mine go out, and they had to drop the exhaust to put in the new one. Sucks.

 

sounds like "limp home mode"??

 

Alright guys need some more input from you please.

I am almost positive the reason its running so bad is because it is getting way way way to much fuel, so its running much to rich (duh). I am getting a black liquid coming from the end of the y pipe (not a lot but enough), which is a mix of gas and carbon and the car is shooting out a good bit of smoke.

Now I say I am almost positive thats its a fuel problem because I ran out of gas in the tank and the injectors stoped spraying, then all of a sudden the car started running much smoother until it used whatever fuel was left and then died.

So could this be a problem in my chip? I had a friend remove the VATS for me using winbin, but is it possible he altered something else that could be making the computer increase the fuel supply?

Also when I set timing and remove that wire to get base timing, which point on the timing tab do I want balancer mark to line up with? I can't read the markings so if you could tell me something like the mark near the pass side or in the middle or by the driver side, something like that.

Thanks again for the help. I am more determined then ever to get this car running right and finished. A long project hopefully nearing completion.

 

what are your O2 sensor readings? what is your timing set at?Id start here

 

I have no idea what my O2 readings are, I don't have my dash setup yet. What would that reading tell me anyway if I did know what it is? And like I posted above, I can't see the marks on the timing tab so I have no clue what it is. When I first checked it, the balancer mark was at the point on the tab by the passenger side. I moved the dist some until the balancer mark was lining up with the center timing mark. So I guess I need to know what degrees are on each timing mark first, and second if this chip I got could be causing my fuel problem.

Thanks and please help me get this car going. It ran great when it was in my RS.

 

What is your MAP voltage during idle??

It is possible you have a vacuum leak, raising the MAP voltage, telling the ECM to dump more fuel into the engine...
Let me know

 

ok, I haven't hooked up any diagnostic equipment to the car yet so I don't have any sensor read outs. My friend is helping me out with the new chip and I should have that by the weekend. He is also bringing his laptop with a program to see all the diagnostic information.

So what would be very helpful to me is if you could tell me what the normal values are for each sensor. Like what is normal voltage for the MAP sensor, O2 sensor, and anything else like that? This way I can compare those values to the ones we get off the laptop and see if there is any difference. I sure hope its this chip we made that I am using now thats causing all these problems.

 

I agree. A vacuum leak will cause the computer to think it is under a load and dump in fuel to correct it.

Lon

 

ok I still would like to know what the normal readings are for my sensors so I can have something to compare my readings I get when we hook up the laptop. But for the time being I have a vacuum guage, so where should I hook it up at? and what kind of reading should I see at idle? during load?

Thanks

 

yes people keep posting i have the exact same problem
does anyone think it might be a problem with the filter or fuel pump?
i have everything withits stock connections and will be replacing the injectors and filter shortly.

 

my car was running like **** before, it would search for idle pretty bad, and when I gave it gas it would die out. I thought it was the map, tps, iac, or the O2 so i changed all them, and lo and behold it ended up being the fuel pump. I changed that and the car ran beautifully