9formula4

iTrader: (5)

Ok someone please help me with this. I need this car back up and going.

Here is the dilemma:

I start the car in the morning, let it warm up. I take off and drive to work no problems not even a stumble. I get to work (17 mins away) and when I pull into the parking spot the car idles LOW and shakes and then stalls. Same thing happens after I come out of work and get home.

Checked fuel pressure and it is 39-40 at idle and stays. Pressure stays as I shut the car off also. Just replaced the wires and plugs. Had the ICM spacer mod (shoeboxs washer idea) but had to pull the heads to change out the valve stem seals and did not put the washeers back in afterwards. Only other thing that is out of the norm is I havthe O2s unplugged (went bad).

I don't have a scanner and don't want to pay 30 bux to have codes pulled. I have a SES light but I am assuming it is the O2s because it doesn't come on right away.

PLEASE HELP AS THIS IS MY DD!!!!!!!!!!!!

Also its a 94 formula.

355z28

iTrader: (8)

if its the o2s right of the manifolds that would be your problem, runs great when its cold but as soon as it warms up you have keep ur foot on the gas to keep the idle up so it doesnt die...yeah been there done that, when i first put the motor in my car i just had open headers with no o2s pluged in..put the exhaust on and put the o2s in and cleared the codes runs great.

ihaterice

ya thats it! when cold your running in closed loop where the computer dosent care what the o2's say when it warms up to operating temp the computer looks for input from these for what to do with the a/f mixture, try letting it warm up just sitting there and see if it dies if it does then i would say that the o2's are your problem

9formula4

iTrader: (5)

I just did that and it didn't seem to affect it. I will get some O2s and see if thats the problem.

ihaterice

you can check codes with a paperclip also its really easy ill try to find it on here for you

9formula4

iTrader: (5)

no I have a 94. It doesn't work like that on mine. only 93s can do that.

ihaterice

oh thats righ, my bad, i think you can get a cheap autozone code flasher for like $15 im not 100% sure though

Ralls

iTrader: (32)

Bite the bullet and find out what the code is. Your just guessing and your going to pay more in the end if you replace the o2s and that doesn't fix it.

You could disconnect the MAF connector and see if it stalls out on you. But don't just let it idle, put it under the same conditions as it was when it stalled on you.