Bman

a friend of mine has a 91 civic hatch... he just bought it recently and its not worken to well... this is what he told me

i start it. it idles at 1,500 for like a few seconds and then it goes to 1,00 stays for 10 mins then it starts to jump to 1,500 down to like 350 five times. then it stauls



if anyone knows what this could posibly be pls post... any help would be good right now

thanx

Cynikal.Mindset

are there any codes being thrown? always start at the ecu and check for codes!

bbarbulo

iTrader: (2)

could be many things, from bad EGR, carbon fauled IACV, or throttle body, bad plugs, leaking vacuum, air in coolant. Start by doing some damn basic maintenance. Flush and fill coolant. Test. Clean throttle body, test. Change plugs and wires, test. Remove and inspect EGR (if applicable, I dunno whether EDs have EGR systems). Replace PCV as well, hook up vacuum gauge and test vacuum. Need good, steady vacuum.

imported_Duge

dude, civics don't have egr's if they were USDM..

imported_Solid

I think they do if they are automatic.

dingus88

check for vacuum leaks...check MAp sensor and tps voltage...waht do the plugs look like wires, filter clogged....mx-3's are plegged with a unknown idle problem..to fix it I alway's jsut gave my buddies mx a full tune up adn clean the filter (k&n)

Bman

my bud says that a friend of his said it can be from backpressure cuz theres no muffler.

do you guys think that could be it??

imported_gatherer

no because there would be no back pressure ... but I drove my car like that till I could go pick up a new one and it was fine....

seriously do the basic maintenance Bruno suggested and put a muffler on should be fine...