Hey everyone; I'm having some troubles with my engine and was hoping someone here could help me out.

I have a 1986 305 V8 TPI (LB9) in my 1988 sport coupe

Here's the situation:

My timing was too advanced. So my father adjusted the timing back to 6 degrees top dead center, like the manual for my engine says. We disconnected the EST relay or whatever it is, and that allowed us to set the timing. However, once we hooked that back up and started the car to let it run, the timing was advanced again by the ECM back to where it was before. My dad said that the computer is controlling the timing when the EST is hooked up and as a result, the timing is being brought to where the computer says it should be.

Here's the idle situation:

My car used to idle really high. In park, it idled at around 1500 RPMs. In drive, it idled at around 900. Me and my dad were able to adjust the idle screw so it idles a bit lower, but it's still at 1500 RPMs in park but around 600-700 RPMs in drive. I know it should be lower than that.

And, on top of these two issues, my car runs real rich. I swear; you can smell tons of gas in the air after the car runs for not even a minute! And this smell isn't around when the car is off.

Can anyone help me solve these problems? I'm about a week and a half away from putting my car on the road, and I don't want to run into problems while driving it, and I have emissions inspection in my state, and I sure as he** don't want my car to fail.

Any help is really appreciated and badly needed.

Thanks all for taking time to read this!

Kev

 

You havn't given much info on car. Such as injector size, engine mods, do you also have the 86 ECM installed, was it man. or auto. Running rich means too much fuel is being dumped in the engine. It can't burn it all, so it goes out the exhaust. Normally caused by high fuel pressure, leaky injectors or chip mismatched with components. Give us more info and we'll give it a go.

 

Disconnet the battery for a few minutes. You should ALWAYS cleat the ECM when ever you set your timing.

 

Just a stab in the dark, but check the CTS - sounds a little like it's not getting a temperature reading.

 

72LT1VETTE-

In response to your post, I'm posting more information about my car. Everything posted is all the stuff I know, and if you need more info, I can try and find out what you need, but I can't make promises.

My car is a 1988 Sport Coupe. It has a 1986 LB9 305 V8 w/ Tuned Port Injection. From what I understand, the transmission in my car now was the one that has always been there; it was just resealed. My car originally had a V8 throttle body, so I guess the mounts for the tranny and engine were the same. By the way, it's a TH 700R4 automatic transmission.

I would assume that the ECM came out of the 86 car. I can't see how a fuel injection system using 8 injectors could work with an ECM that only used two (TBI) originally.

I have no idea what my injector size is. The previous owner said that the injectors were the only part of the engine that wasn't rebuilt or replaced. They all have well over 100,000 miles on em, and all have been in the manifold and fuel rail since they were put there in 1986.

My dad always taught me to go with the minor things first. So I'm gonna check the fuel pressure and see what's up with that; if that's too high, we lower it. If not, then I move on to what's next.

Thanks all for the replies, and keep em comign! You guys are a GREAT help!
:hail:

Kev
:hail: Thirdgen.org