steve i need help

[gnxis]

i have a slight miss when i first start the car cold it seems to go away as it warms up.also o2s are very erratic.thanks in advance.

 

[Steve Wood]

Lot's of Steve's here...I hope it is not me! LOL

Let's see, the car is in open loop when you first start it so I don't think it can be the O2 sensor. If it runs okay warm and under load, I don't think it can be a plug, wire, or coil.

Does it do it after you have driven it, and then parked it for 30 mintues or so? I am wondering if you could have a leaky injector which is wetting a plug.

Also, I guess I would remove the IAC, clean it, it's passages, and throttle body with carb cleaner and then reinstall and reset the the IAC to about 20 counts while it is idling in Park (do this with the engine full warm)

Also check all the vacuum lines for a leak.

Spray some carb cleaner around the base of the plenum to check for a leak as well.

That is about all I can think of on the first pass. I am sure you will get a bunch more ideas.

 

[gnxis]

thanks i'll try the carb cleaner thing and clean iac.i'll also ckeck vaccum lines i've already replaced most of them it's quite possible i missed 1 or 2.

 

[gnxis]

ok i tried the carb cleaner thing it didnt change idle.
no vaccum leaks.
also cant get iac'sbelow 48.
tps is at 42 / 4.70
is iac adjusted by turning idle screw on top of throttle body?

 

[Steve Wood]

yeah, turning it in should bring it down when in Park....48 is within factory specs, I think, but sometimes the idle is steadier with a lower number.

Did you shoot carb cleaner around the ends of the butterfly shaft to see if it was sucking air?

 

[gnxis]

yes i did .
i drove the car today man she ran like sh.t first the turbo outlet hose blew off,fixed that,had real bad stumble at 3/4throttle,found vacuum hose that blew off,fixed that seems to run a little better but not quite there yet.
my scan master is throwing 13 code so i got new o2 sensor new plugs and new vacuum hose and zip ties today im going to try this tonight.