3.8 turbo very rich

[85ttype]

hey everyone what are some good places to look and check because my 85 ttype is running so rich it makes your eyes water and it has an after market cat i know that the ecm and wiring harness have been changed to an 87 harness and ecm but currently the fuel pump went out and canot do any starting tests but it had good fuel pressure before when we had these problems

 

[85ttype]

it also hs a new o2 sensor and throttle position sensor both did not fix it fuel pressure did not drop while waiting between starts

 

[Pontiac455]

Make sure the lines arey in the right place on the sending unit. If ya mix up the vent line and return line she will run really rich because it cant return the fuel quick enough and the pressure will be too great on the injectors. If that is allright than check the fuel pressure regulator.

 

[tetomas]

Make sure the lines arey in the right place on the sending unit. If ya mix up the vent line and return line she will run really rich because it cant return the fuel quick enough and the pressure will be too great on the injectors. If that is allright than check the fuel pressure regulator.

+1 what he said, and also check the vacuum line going to the fuel pressure regulator. Low or no vacuum equals high pressure which equals a rich mixture.

 

[MeanBuicks]

Do you have a scan tool so that you know the TPS is properly adjusted? You can also verify Idle Air Control operation, O2 voltage, etc. What is your fuel pressure set to? Does the fuel system hold pressure when the car is shut off? Are you sure the chip matches the injectors?

 

[85ttype]

the scan tool is my computer and i have set it as close as i could i havent been able to find the iac but pressure was below 40 psi and system held pressure with ignition off unsure of chip have not gotten into any of the programming havent even taken the cover off the ecm to check for an aftermarket chip and don't know if injectors are stock the tps reads minimal at idle unsure of lines havent had tank out but do know that po had lines cut for new ones to be ran unsure if in the right places we just bought the car less than a month ago and has moved under own power into and out of our driveway once we had to push into driveway when it arived.

 

[MeanBuicks]

Your O2 sensor readings should give you a clue as to how rich the mixture is. If it's as bad as you say it is I'd expect a code 45 error along with a Service Engine Soon Light. That's for an excessive rich condition. You should also look at the Integrator and Block Learn numbers. Those are the short and long term fuel trim adjustments that the ECM makes. Again, if the system is way rich then the fuel trims should both be well below 128.

You really need to identify the fuel injectors as well as the chip to ensure that they are correct and compatible.

 

[85ttype]

The 02 reading was .5 volts factory one wire the long term fuel trim was very low but it did not set any codes infact the old o2 sensor set a too lean code and the car stunk is out of our garage. How can I identify what injectors and chip I have

 

[MeanBuicks]

Most aftermarket chips have an ID label which may only be some numbers. Injectors will also have part numbers. Look closely at the molded plastic connector for some numbers. You could also post photos too. Are you on turbobuick.com? There will be a lot more help over there with stuff like this.

 

[chevy2480]

As stated above identify the inj and chip. Along with all the suggest readings above. Also make sure the coolant temp is not reading negative temp or excessive cold that will cause the computer to dump excessive fuel because it thinks its colder then it really is.