SOURCE: cold start
Obviously a sensor feeding wrong info to computer for cold start/running. Will save money in long run if you have it scanned for free at auozone, or PEP boys.
SOURCE: after it warms up it runs bad for 3-4 min.than runs 4 the day.
Well the vehicle your talking about is 17 years old now and I would expect to run into this sort of problem with this many years on the vehicle. The problem could be many different things.
The first thing I would start on if it hasn't been done in a year or two is a some basic maintenance.
Change the spark plugs, spark plug wires, distributor cap and rotor, and fuel filter.
I had a car one time that had the exact same symptoms as you are describing at it was due to corrosion on the metal points inside the distributor.
Condensation will build up inside the distributor cap and rust the metal contacts that make contact with the rotor. When this happens you aren't getting a strong enough spark to let your car run properly.
I would check the distributor cap first since its "free" to clean up and don't forget to lightly scrape any corrossion that has built up on the rotor as well.
Then if you haven't I would start going down the list of maintenance I made for you.
Granted these things may not be causing your problem but they are the cheapest easiest parts to maintain. And I gaurantee that if you haven't change these parts in a while and you do change them you will definetely feel a big difference in the way your vehicle runs.
I hope this helps you get started in the right direction and if it does help me out and give me a good rating,
Thanks,
AadoubleA
SOURCE: Hard Starts! changed out wires,plugs,dist.cap.
Check to see if all your fuel injectors are firing. To check, take a screw driver and press it agains the injector, then press your ear against the handle of the screw driver and listen for clicking. If no clicking, then either your injector is bad or you have a bad injector resistor pack. I'm not sure how to test the resistor pack (standing in front of the car, it's on the right side of the engine compartment with the heatsink attached), but you can check your injector by measuring the resistance on the contacts of the injector. You should get 1.5 - 2.5 ohms. If not in that range, that could be your problem. Next I'd think about replacing the ignitor inside the distributer and/or checking the fuel pressure to make sure it's good.
SOURCE: car runs OK cold but
Is it Diesel (turbo/non-turbo) or petrol? If its petrol then get the ignition system checked, for diesel it looks like problem with fuel pump.
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