bodilx6 Posted January 14, 2008 Share Posted January 14, 2008 Every time I start the soop with a warm engine (everything from a few minutes after a drive to 1 hour) it runs really bad, like only on a few cylinders or so @ 300 rpm or so going a bit up and down. If I "help" a bit with the throttle lifting revs to 700-1000 it runs as smooth as ever untill I let go of the throttle again. If I go for a short drive and stops it idles fine again so its only just at startup. The car is BPU, stock intake, no known leaks and genrally pulling nicely. Only thing is it's got Toyotas Iridium spark plugs gapped to 0,5mm which can cause a misfire at idle once in a while, but that doesn't seem like thats to prob at all Any thoughts? Quote Link to comment Share on other sites More sharing options...
SILKYSMOOTH Posted January 14, 2008 Share Posted January 14, 2008 This what it says in my Supra Workshop Manual, might be of help. Rough idle, Missing or Stalling Incorrect curb idle or fast idle speed - Reset idle speed, Incorrect basic timing - Reset ignition timing Improper idle mixture - Reset idle mixture, Improper feedback system - Check feedback system operation Incorrect spark plug gap - Reset spark plug gap, Moisture in ignition components - Dry components Loose or broken ignition wires - Replace ignition wires Damaged distributor cap or rotor - Replace distributor cap or rotor Faulty ignition coil - Replace ignition coil Fuel filter clogged or worn Replace fuel filter Damaged idle mixture screw - Replace idle mixture screw, Improper fast idle cam Reset fast idle cam Improper EGR valve operation - Replace EGR valve Faulty PCV valve air flow - Replace PCV valve Choke binding or improper choke setting - Reset choke or eliminate binding Vacuum leak Repair - vacuum leak Improper float bowl fuel level Reset float adjustment Clogged air bleed or idle passages - Clean carburettor passages Clogged or worn air cleaner filter - Replace air filter Faulty choke vacuum diaphragm - Replace diaphragm, Exhaust manifold heat valve inoperative - Replace heat valve Improper distributor spark advance - Check distributor operation Leaking valves or valve components - Check and repair valvetrain Improper carburetor mounting - Remove and remount carburetor Excessive play in distributor - Replace distributor shaft Loose or corroded wiring connections - Repair or replace as required Engine Stalls Improper float level - Readjust float level Leaking needle valve and seat - Replace needle valve seat Vacuum leaks - Eliminate Vacuum leaks Quote Link to comment Share on other sites More sharing options...
turbonut Posted January 14, 2008 Share Posted January 14, 2008 Compression testing may point out your problem L Quote Link to comment Share on other sites More sharing options...
bodilx6 Posted January 14, 2008 Author Share Posted January 14, 2008 Vacuum leaks - Eliminate Vacuum leaks Hmm... Also got a BOV that wont vent at low boost, I have been searching for vacuum leaks and my boost gauge says a stabile -0,7 bar idle boost. Wouln't that be higher if I had a vacuum leak? Compression testing may point out your problem L Kewl, gonna have a look at that shortly anyway. Hopefully that will show something Quote Link to comment Share on other sites More sharing options...
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