motor was rebuilt last summer.
ctr pistons, rm cams..

-car spits black stuff off tail pipe. (water+black stuff) not oil
-car wants to stall on cold start.
-after car's warmed up it idles erratically rpm goes from 800-(1250-1300)rpm
if i disconnect the tps sensor it idles high at 1500 rpm.

i failed e test cuz of it won't idle steady.

what could be the problem ???
thanks

 

Check your vacuum hoses. Condensation will give you that black/wet stuff cause the motor hasn't warmed up.. especially if you haven't tuned the motor. You could also have a bad IACV.

Do you get any codes? Who built the motor?

 

what should the vacuum pressure at idle be?
i have no codes.
motor was built in a local machineshop

 

alternator? do the lights or electical components fade in out? maybe check timing, make sure all connectors hoses are tight. are you running stock ecu?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec.dc2 &raquo;</TD></TR><TR><TD CLASS="quote">alternator? do the lights or electical components fade in out? maybe check timing, make sure all connectors hoses are tight. are you running stock ecu?</TD></TR></TABLE>

no chipped p28. tuned with crome

 

mine does the same thing Jeff, when i leave it outside. The -20 weather with the windshields dont help at all..

I think the weather has alot to do with it!

 

NOTE: I always had my EVAP unplugged ever since i had p28 ecu. because it wouldn't run with evap plugged in.. today my buddy plugged that evap connector back in.. and the car wanted to die but gave little gas .. and it now idles at around 1150 rpm.

erratic idle's gone now.

i tried to turn the idle screw but can't get the idle any lower.

which way do i need to turn the screw to lower the rpm?

i went clockwise few turns and it still idles at 1150

 

come on~~~~

which way do i need to turn the screw to lower the rpm?

 

i guess nobody know which way it has to be turned to lower the rpm ...

nice

 

You have a manual? Whats your email? Also, have messed w/ the throttle rotor stop screw under the rotor? I believe its an 8mm nut thats backing a allen wrench adjustable screw. See if your shop messed w/ that at all. Did you check your IACV

 

clockwise is to lower it.
counterclock wise is to higher it.

i found out myself lol

i cleaned out my iacv recently.
no i didnt try to mess with that screw under the rotor.

what rotor are you talking about?

my email is jeffyoon81@hotmail.com

 

rotor\ cable sorry...vague... eating and typing.. w/ 1 hand

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by itr1244 &raquo;</TD></TR><TR><TD CLASS="quote">NOTE: I always had my EVAP unplugged ever since i had p28 ecu. because it wouldn't run with evap plugged in.. today my buddy plugged that evap connector back in.. and the car wanted to die but gave little gas .. and it now idles at around 1150 rpm.

erratic idle's gone now.

i tried to turn the idle screw but can't get the idle any lower.

which way do i need to turn the screw to lower the rpm?

i went clockwise few turns and it still idles at 1150</TD></TR></TABLE>


i went a step further with obd1 ecu by disconneting the evap connector and plugging the line itself. there is a drain plug underneath so it eventually going to make its way there. right now you might be ok but summertime you might have same problem as its released during startup. if you do'nt tune the car yourself. have your tuner check out the maps and see if he can do anything to help with idle.

 

vaccum should be 17-20