I have a 1989 non turbo convertible. Stock other than straight pipes. I get terrible gas mileage and I can tell it's running pig rich. Gas pours out of the tail pipes. How do you adjust the air/fuel mixture? I searched but couldn't find anything. Stock ecu also

 

There is no carburetor so it's done automatically by the ECU through inputs measured off of your MAF sensor, TPS, water temp sensor, IAT, etc. The car usually runs slightly rich anyway. If it's running very rich, something is probably telling the ECU you have a massive amount of air coming into the motor and it's keeping the injectors open. Check TPS and MAF as a start.

 

I know how to test the TPS vaguely. But I don't have a clue about the MAF

 

The FSM will guide you to test the AFM and other sensors. Using the advanced search feature will also help you. And if your ignition is sub par then it will not ignite the fuel completely.

 

I test the coils for that right? I just changed the spark plugs about 4000 miles ago. I used the NGK bur7eq leading and bur9eq trailing

 

Yes.

 

IAT kept telling it it was cold even tho the engine was warm so it was dumping fuel. Thanks for the help guys! Still pops flames lol 😁