Question about Honda XR 400R
The barrel seems to come all the down ,i have the idle screw backed out i found a crack in the intake pipe thought it was sucking air there bought a new one but still idles to high i dont know maybe something wrong in carb it was new 3yrs ago
Posted by Anonymous on
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Posted on Jan 02, 2017
SOURCE: high fast idle at start up.
On most newer cars there is a fast idle motor controlled by the computer that will hold the fast idle till the engine reaches a preset temp in the computer then the engine should drop down to the set idle according to specs for that car. If the oil pressure continues to stay low after the idle goes down you may need to replace the oil pressure sending unit or if worse case the oil pump.
Posted on Nov 18, 2008
SOURCE: How to I set idle speed?
Before performing any on-vehicle adjustments to fuel or ignition systems, ensure engine mechanical condition is okay. CAUTION: When battery is disconnected, vehicle computer and memory systems may lose memory data. Drive ability problems may exist until computer systems have completed a relearn cycle.
IDLE SPEED & MIXTURE
NOTE: Idle mixture is controlled by Powertrain Control Module (PCM). Adjustment is not possible. After replacement of Idle Air Control (IAC) valve, system must be cycled as identified for PCM to properly control idle speed. If idle speed is not okay after cycling system, problem is usually caused by a dirty throttle plate or vacuum leaks. Ensure all vacuum components are functioning properly.
IDLE SPEED (4-CYLINDER)
Turn ignition on with engine off for 10 seconds. Turn ignition off for 10 seconds. Start engine and idle for 30 seconds. Slowly vary engine speed between idle and 3500 RPM 5 times. Return engine to idle. PCM will now properly control idle speed. 2.2L (Cavalier & Sunfire) & 2.4L (Alero, Cavalier, Grand Am & Sunfire) Good luck and hope this helps. If it still has the high idle problem, your going to have to buy a can if not two cans ot THROTTLE BODY CLEANER NOT CARBURATOR CLEANER. Just follow the instruction on the can and try to get the Idle Air Control Valve cleaned also which is on the sdie of the throttle body so go to town when cleaning the throttle body and then do the Idle speed relearn again. The other thing to is since your doing house cleaning, buy a MAF sensor cleaner and spray down your MAF sensor and IAT sensor also, this will help with your fuell consumption.
Good luck and keep me posted, be glad to help.
Posted on Jul 04, 2009
SOURCE: ive rebuilt a holly 4
You have to have a carb base plate gasket. Mr gasket makes a decent product that i currently use on my 84 F150. remove your carb and inspect the base of it, remove any debris that may be causing it to not seal properly. good luck
Posted on Dec 28, 2010
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