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Hi all. I have a 2000 model Hayabusa (RY). High CO (5.61 one exhaust 5.25 other exhaust), bad fuel economy, running lumpy under 2500rpm. Injectors tested and cleaned. Coils checked for correct resistance and blue spark. New plugs fitted (ngkcr9e). Throttle bodies synced. Tps (throttle position sensor) set correctly in 'dealer mode'. Air temp sensor checked for correct resistance. Valve timing correct. Tried swapping back to original cans (no change). Compression check done (175psi x4). I've removed and blanked the pairing pipes above the exhaust headers. Air box is not cut out (yet). I've run out of things to check in my shed. I'm thinking too much fuel pump pressure or ecm needs remapping, someone told me to fit hotter plugs but I think that is masking the problem. Any suggestions welcome. Dave.

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  • Suzuki Expert
  • 378 Answers

Try a different ECU

Posted on Apr 14, 2017

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Posted on Jan 02, 2017

  • 738 Answers

SOURCE: 1100i sport misfire myecu fitted

You have spent alot of money on this. To no avail, have you had this on a dyno check the runningwith diagnostics

Posted on Apr 30, 2011

SOURCE: hi 2.6 rodeo isuzi 1997 egine wont idle or rev out also slight back fire through inlet manifold have tryed to fix im a mechanic tried changing mass air flow sensor as check light was on when fitted

Hi Bruce, The reset of the engine check light should be incorporated into your diagnostic equipment. Erase Fault Codes should do the job for you. I think that the fuel pump pressure is low. It should be about double the reading you have. (3.8 bar or 55.2 lbs per sq in) Replace the pump and fuel filter. In addition take some water and check that the intake manifold is not leaking air, as that would cause the problem you're reporting. If anyone has taken the distributor out check the setting again and the HT lead positions. Regards John

Posted on Jun 17, 2012

  • 14 Answers

SOURCE: 91 cutlas ciera 3.3l v6 backfires then stalls but starts back up

SOUNDS LIKE THE IGNITION MODULE OR COIL PACKS HEATING UP

Posted on Sep 12, 2012

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Cl 1200


Reset valves and throttle bodies

May 06, 2014 | 2003 BMW R 1200 CL

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Bad fuel economy and lumpy idling - possibly causes


<p><b><u><span>Excessive fuel consumption and 'lumpy' idling engine</span></u></b><br /> <p><b><span>Possible faults:-</span></b><br /> <p><b><u><br /></u></b><br /> <p><b><u><span>Coolant sensor </span></u></b><span><span> </span>- engine is signaled as being 'cold' all the time, not just at start up, causing ECU to set longer injection cycle </span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Low coolant level can prevent sensor being able to detect coolant temperature</span><br /> <p><span><span>&oslash;<span> </span></span></span><span>Faulty 'open' thermostat allows coolant to circulate without regulation and perhaps prevents the engine from achieving normal running temperatures.</span><br /> <p><span> </span><br /> <p><b><u><span>FPR</span></u></b><span> - broken diaphragm allows fuel to enter the vacuum line and then into the inlet manifold. Additional source of fuel makes the fuel air mix richer causing a faster and lumpy idle.</span><br /> <p><span> </span><br /> <p><b><u><span>Vacuum leak </span></u></b><span>- 'high oxygen' signal from O2 sensor causes ECU to set longer injection cycle.</span><br /> <p><span> </span><br /> <p><b><u><span>O2 sensor</span></u></b><span> - 'high oxygen' sensor error causes ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br /> <p><b><u><span>MAF</span></u></b><span> - 'over reads' in error the amount of air entering causing ECU to set longer fuel injection cycle </span><br /> <p><span> </span><br /> <p><b><u><span>IAT</span></u></b><span> - 'under reads' in error the temperature of incoming air causing ECU to set longer fuel injection cycle</span><br /> <p><span> </span><br />

on Jul 22, 2011 | Mercedes-Benz E-Class Cars & Trucks

1 Answer

My 91 explorer wont pass emissions, Co levels too high and hc levels. Are high as well


have your air/fuel (a/f) ratio checked. high CO level means you have a rich a/f mixture.

rich a/f mixture means there is too much fuel compared to air. this is bad for fuel economy.
lean a/f mixture means there is too much air compared to fuel. this needs immediate attention since this might lead to over compression in the combustion chamber, which develops to total internal engine failure.

Aug 06, 2011 | Ford Explorer Cars & Trucks

1 Answer

When I park my 2000 acura tl it has a strong odor of gasoline in the garage. it is hard to start and the fuel economy has gotten bad.


more than likely cause for this is a gas leak more than likely one the metal lines under the car has gotten rusty and started to leak
another possibility is a injector is leaking or pressure regulator is bad and it dumping to much fuel into motor but this will usually trigger a engine light (code would be a o2 sensor or bank 1 to rich or bank 2 to rich) also might also have black smoke coming out exhaust
So if u dont have any engine codes more than likely cause is a fuel line leaking

Jan 12, 2011 | 2000 Acura TL

2 Answers

Volkswagon golf 1.4 1996 petrol this car is drinking petrol and there are no leaks what are the probable faults


starting in no particular order.....air filter blocked,auto choke stuck,thermostat stuck open,tyres under inflated,(5spd gearbox 29.4 mpg...4spd gearbox 32.8mpg,average consumtion,yes, thats right,govt figures)

Oct 22, 2010 | 1996 Volkswagen Golf

1 Answer

V40 direct injection gdi . rich running & lumpy idle


replace lambda probe expensive but it will run ok after that, i dont know if you know how they work so here's a brief: lambda tells ecu how rich the exhaust gasses are, ecu ajusts fuel input as neccasery eg lambda says not anough fuel ecu puts more in and the other way round.
so if your lambda is covered in **** when you get it out just clean and put it back, if it looks clean enough it needs replacing!! jezza

Feb 09, 2010 | 2000 Volvo V40

1 Answer

P1131 manufacturer control fuel air metering. What is the part? The car is Mazda 626 carburator 1997.


Hi Galant5Rov,

Firstly, congratulations to you on identifying the Trouble Code. This code relates to the Heated Oxygen Sensor (H02s)

The oxygen sensors supply the computer with a signal that indicates a rich or lean condition during engine operation (i.e. fuel/air metering).

This input information assists the computer in determining the proper air/fuel ratio. A low voltage signal from one or more sensors indicates too much oxygen in the exhaust (lean condition) and, conversely, a high voltage signal indicates too little oxygen in the exhaust (rich condition).

The oxygen sensors are threaded into the exhaust manifold and/or exhaust pipes on all vehicles.

A faulty oxygen sensor due to loose connections, bad grounds, high resistance in the circuit, or opens in the circuit can cause the following symptoms.
Related Symptoms
  • Surging at idle
  • Unstable idle
  • Running rough off idle
  • Hesitation
  • Stumble
  • Chuggle
  • Poor fuel economy
  • Spark knock
  • Stalling on acceleration
You must take EXTREME care when removing these sensors, as they can be difficult to remove (seize up). You may require a special tool to remove these without causing damage to the sensor.

Cheers,


"If this has helped you in any way, please rate this solution" :-)



Jan 27, 2010 | 1997 Mazda 626

1 Answer

Fiesta running lumpy


try running redex through the system then change the fuel filter to rule out a blocked line

May 19, 2009 | 2000 Ford Expedition

1 Answer

High CO emissions


run the fault codes and look for problem heated oxygen sensor ( HO2S) in the exhaust manifold , or problem oxygen sensor (O2S) after the cat converter, problem EGR system or problem cat converter

Apr 05, 2017 | 1995-1997 Chevy Suburban Ignition Starter...

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