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Backfires bad and keeps hunting from full throttle to idle and back

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Hi, this sounds like a carbruetta problem. Back fires are caused when too much fuel is being injected and igniting in the exaust maniflod. Also check and clean your air and fuel filters.

Posted on Aug 06, 2010

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There is a fuel mixture screw located on the bottom of it's carburetor. Looking from the top of the carburetor, turn it counter clockwise just one quarter of a turn. If that helps but doesn't stop it, tweek it a little more until the searching stops. If nothing helps, it is gummed up from bad fuel and needs to be disassembled and thoroughly cleaned.

Posted on Dec 16, 2010

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1 Answer

Engine won't idle /sometimes backfires


Check the MAF-MAP SENCER or it's a throttle position sencer is bad check both by replacing them and see if it works or the last result is idle control valve

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1 Answer

Idle up down


hunting or surging ilde. name the 2 RPMS, low and high , is it hot or cold engine this issue.? 400rpm or 1000 or 2000 all are diff.causes.
no year, stated. so cant help.
but ill answer in the generic,
1: the ECU (got a carb,? )
the ecu controls idle speed at all times.
if not , there is a problem (you)
A: air leaks in the induction will make motor race at some point the ECU/ISC loses control. and hunts. trying hard to correct it.
b: egr stuck open idle too low, iSC cant correct it,, bad EGR.
c: engine EFI running way too leak starving for fuel so it hunts for 2 reasons < ISC hunting, and lean does that.
lean is gross power loss and opening throttle bogs the engine.
so is double bad. ISC makes it worse,

all this breaks down to 2 reasons.
1: ISC bad. in some way (gummed up. or restricted inside)
2: bad fueling or air leaks. vacuum leaks.

try answers , the hot cold question and the 2 speeds, of the hunt.
lowest rpm and highest of the hunted range of RPM.

Nov 23, 2013 | Honda Civic Cars & Trucks

1 Answer

Idle hunting


You may have a bad IAC ( idle air control) but try eliminating any vacuum leaks and cleaning the throttle body first. Remove the intake snorkel, have someone hold the throttle wide open for you and scrub the back side of the throttle plate and surrounding bore with an old tooth brush and some carb cleaner. Be sure to spray some into the small holes next to the throttle plate. That should help stabilize the idle. If it still has a problem, replace the IAC.

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1 Answer

My 1981 maxim 650 idles high. what is the correct idle setting and how do i adjust


Hi, Robertshenk and the usual suspects are:
1. Throttle cables improperly adjusted or pinched.
2. Idle adjusting screw needs to be backed off.
3. Intake system air leak.
4. Fast idle choke ramp is not releasing.
5. Broken throttle return spring.
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7. Faulty MAP, TPS, ATS, O2, VSS sensors or wiring/connector
For more information about your issue and valuable "FREE" downloads that you will need please click on the links below. Good luck and have a nice day.
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Yamaha XJ750 Owners Workshop Manual
OEM parts for Yamaha
http://www.carlsalter.com/pdfs/Yamaha_XJ600SK_Owners_Manual.pdf

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2 Answers

2003 sportster is havin a real hard time starting in the mornings, backfires sometimes while trying


not sure what you have tried but here are a few things that could be the cause

bad or fouled plugs
bad plug cables (sometimes you can't tell by just looking at them)
plug gap too close or too wide
bad battery
damaged wire or loose connection at battery or coils
water or dirt in fuel system
fuel vent system plugged. (best to see a dealer for this)

hope this helps

Aug 22, 2011 | Harley Davidson Bullet 500 Deluxe...

2 Answers

Vstar 1100 idling rough and backfiring letting off the throttle


It sounds to me that your carbs might be a little gunked up - you mentioned the gas may have been old, so it's possible that the smaller (idle) jets are slightly plugged up. Fresh fuel might do the trick and/or you could try using a fuel system cleaner and water remover. This problem might 'solve itself' with a little time.

As far as the backfire - this might be either from the carb issue or it could be related to that rattle you mentioned - you could have a loose connection at or near the head - this can **** air and cause a backfire.

I hope this helped!

Jun 09, 2010 | 2003 Yamaha V Star 1100 Classic

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