ok .. starts but dies at a light

[minhbestunnin]

just finished the swap , redtop in a 91 240sx ... no check engine light ... idles at 500 rpm ... but when i took it out for a test drive it dies when i come to a stop. i'll start it up again and revv it to like 5k , let it go , and it wont die .. i put it in first gear, and drive like a few feet , let go of the gas and it'll die ... can anyone help ? the only mods are a BOV and a boost gauge that reads in Kg ... i think its boosting at 0.5 or less , does anyone know how many lbs that is ? you think its a vaccum leak , timing ?

[trybal]

raise your idle to 800-900.. and you probably have a open atmospheric bov which is what is causing your car to die. its letting air out and causing your car to run rich. and killing it. There are alot of threads on here about this

[minhbestunnin]

ok i think i got it , i was unplugging each coil with the engine started ... of course the car would stumble as i take out each coil , but when i got to the 3rd one from the front there was no change , misfire right ? guess ill do a search about that

[minhbestunnin]

i checked the ecu for codes ... throught a 55 = no malfuntion .... ?

[minhbestunnin]

ok i checked the power from the ecu for Coil # 3 ... no power ... soooo whats that mean ? bad ecu ? .... and when i checked the rest of the coils at the ecu , the car would stumble like it was about to die.... soooo yeaaa ... help ?

[Dream240]

try swapping the coil from cyl #3 with a known good one. See if you get the same result or if the problem shifts to where you moved cyl#3 coil to.

If the problem moves with the coil then its the coil. If not....?

[minhbestunnin]

yea , i just did that .... but its still only not firing in cylinder 3 .... hmmmm

[Dream240]

did you pull the plug and check it for damage? Also switch the plug wire with a good one. You might have a short in the wire.

GL

[xplicit240]

check all your vacuums' and specially the iacv. thats usually the cause of it. and 500 rpm idle is bad. too low. fix your CAS most likely its not on correctly. and re time if needed.

[jskateborders]

if your getting no power to coil three, open up your ecu and check where the pin for 3 runs through the ecu for a break. if there is one, you can solder it to fix it, but i recomend getting someone who is really good at soldering. hope that helps

[NemeGuero]

raise your idle to 800-900.. and you probably have a open atmospheric bov which is what is causing your car to die. its letting air out and causing your car to run rich. and killing it. There are alot of threads on here about this

This guy is right.

Do what he says.

[minhbestunnin]

i changed ECU's and its still the same problem ..... if the timing is off , could that be why theres no spark in cylinder 3 ? or no ?

[minhbestunnin]

i also did a compression check ... from the front of the car to the back it goes ... 150 , 145, 140 , 135 ... if that helps

[opponheimer]

The compressions not terrible.

[minhbestunnin]

ok ... checked the timing ... its right ... checked the wires going to the Ignitor Chip .. those are fine ... is there a way I could check to see if theres somthing wrong with my Ignitor Chip ? if its faulty could it be why only 1 cylinder isnt getting spark ?

[Wes_s13]

bump im having the same problem at the moment..need some help..already tried new coils..and nothing..plz help!