Cold-start 20v 4age Blacktop Runs Terribly... Please Help




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Rajiv Mohadawoo: Mine's doing that too. Although mine is a Silvertop. I changed the coolant sensor,but its still doing that. Any advice???

Shahiro Geerman: mines does that 2,after i change the coolant sensor it worked just fine

fisqual: STA wire is the 12v signal your ignition barrel sends to the starter to tell it to fire up. Piggy back that wire coming off the barrel and connect it to STA on your ECU.

fisqual: STA wire is the 12v signal your ignition barrel sends to the starter to tell it to fire up. Piggy back that wire coming off the barrel and connect it to STA on your ECU.

Alan wong: my car having the same problem, can u give me more info and how to do it??

Alan wong: my car engine having the same problem with u, juz wanna know wat is STA wire tat u means??

kimgulle: Well it runs lean, that's for sure. But i guess you've already solved it? The first step i would take is change the coolant temp sensor though.

fisqual: @asiancustoms LOL!!

asiancustoms: sounds freakin awesome you should keep it the way it is or nos kit

bergerbrother: wtf a fire comes out from your TB..i never saw it before.

fisqual: @TheLancergsr wasn't map sensor. read other comments

Shane Bland: get a new map sensor

fisqual: @eishiba I know I'm a little slow (6 months slow, lol). It's an '84 Corolla SR-5 hatch.

eishiba: what kind of car is this?

fisqual: No, it didn't do that if I d/c the map. It was just a few loose wires.

fisqual: No, all stock. AND, it's pretty much fixed. I'm getting 36/29MPG, Hesitation is gone. It's running a little rich, but I think these tend to. I just need to tune it now, and it will be perfect.

Ryan Arends: you solved it right?

fisqual: It's possible that my MAP sensor isn't correct? I bought it on ebay as being for the 4age - but I also pulled a few off of some 4AFEs and 5SFE and 3SFE and tried those too, but they all seemed the same (as mixture and idle goes). My TPS is within factory spec. VVT comes on when I have my gas pedal more than about 65% down or between 4000 and 6000rpm. My car doesn't backfire anymore though, just high idle and running rich.

fisqual: No the ISCV is fine. The ISCV shuts when I ground RSC and opens when I ground RSO (500 and 4000 rpm). My Oxygen sensor is still throwing a code even tho the people on club4ag swear that my O2 sensor is 'compatible'. I don't think an O2 sensor would cause high idle though. my Scion o2 went out a few months ago and it ran/idled fine, just used a little more gas.

ToyCrazyNZ: good idea hi idle cud be caused by few things. iscv (idle valve) wud be my guess tho. blacktops are known for clogging up the inlet from blow by. if u pull the hoses off iscv n spray some carb cleaner down thru it, see if that helps. is the TPS set correctly? is the map sensor getting vacuum from the correct port? backfiring out throttles (pl) wud usually be over advanced ignition timing or advanced inlet cam. but could be to do with vvt coming on early due 2 wrong or faulty map sensor signal?

Rating:
cold-start 20v 4age blacktop runs terribly... please help 5 out of 5

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