i have a 84 2.5 it is running real rich. what can cause it to run rich and where should i start to fix this problem?

For a start...

What do your spark plugs look like when you pull them out? Do they all show even wear and/or coloration?

How old is your O2 sensor?

Does the injector leak/drip when the fuel pump in primed and the engine is not running?

Does the injector have a nice even spray pattern, or is the fuel drizzling out when the engine is running?

[This message has been edited by Patrick (edited 03-14-2014).]

i just put spark plugs in it new fuel pump it sprays evenly not sure on the o2 sensor

quote Originally posted by krum: i just put spark plugs in it

Well, what was the condition of the ones you took out? Did they all look the same as each other?

quote Originally posted by krum: new fuel pump it sprays evenly

A new fuel pump doesn't necessarily have anything to do with the condition of the fuel injector, but if the injector doesn't leak and is spraying evenly.... great.

quote Originally posted by krum: not sure on the o2 sensor

If you don't know the age/condition of the O2 sensor, it would probably be a good idea to replace it.

all of the plugs were the same they were black if i remember correctly . i am gonna replace the 02 sensor the fuel pump was dead when i got the car thats why i replaced it

[This message has been edited by krum (edited 03-14-2014).]

Is your MAP sensor connected to engine vacuum correctly? Any vacuum leaks? Unplug the MAP sensor electrically and how well does the engine run?

when i unplug the map sensor it runs like crap no vacuum leaks

[This message has been edited by krum (edited 03-15-2014).]

So your prime suspects now should be that 0² sensor or the Coolant Temp Sensor.

i ordered a coolant temp sensor a 02 sensor and the other temp sender/sensor i should have them thursday i will be putting them in on the weekend

well i think the problem is fixed i replaced the o2 sensor ,temp sensor , and the temp sending sensor

Did you happen to replace one at a time and check to see if the problem was fixed?

Just curious as to what turned out to be the problem.

i replaced them all at once only cost me like $30 for all 3 of them on rockauto