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Engine lacks power when accelerating. Idle ok.

When motorcycle has not been used over a longer period (with fuel shutoff valve closed), the engine lacks power when accelerating (and makes a lower noise). The engine idles ok.

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Unfortunately when you leave for long period of time fuel in carbs turn to a gel you may have to clean the float chambers out and put fresh fuel also look for signs of rust deposits from tank

Posted on Apr 21, 2013

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Posted on Jan 02, 2017

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SOURCE: PO171 OBD-II Trouble Code " System Lean To Bank 1

Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

Posted on Jan 01, 2009

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

  • 1 Answer

SOURCE: Noisy engine idle and stutter at low or high speed

I had the same problem (X-type 2.0d 2004). The stutter was cured on mine by getting the ECU fashed with the latest firmware. This is a known problem and the update does cure it (£28), I didn't bother with all the tests the garage wanted to.
The noisey engine at idle is the alternator belt. It resonates at idle and causes the noise, There is a modified bottom pulley, tensioner and belt kit, but it is rather expensive ~£200 plus fitting (around 4 hours labour). Mondeo's have the same problem but that kit doesn't fit the Jag.
Hope this helps
KB

Posted on Mar 16, 2009

  • 14036 Answers

SOURCE: loss of power on acceleration. engine bucking.

check transmission fluid.change fuel filter and air filter.try changing up on where you buy gas .because bad gas causes problems.

Posted on Jun 26, 2009

  • 1146 Answers

SOURCE: 1994 honda civic 1.5 16v stalling after pressing accelerator from idle

Another place to look is your IAC, or Idle air control valve. It is bolted to the back of the intake manifold, and can be removed and cleaned. It is usually the cause of most Honda Idle problems.

Posted on Apr 18, 2010

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How do i find out what is causing such a lack of power when going up hill,its so bad that down shifting is the only way to maintain road speed...?


Have you replaced the fuel filter . A clogged fuel filter can cause fuel filter can cause poor power problems . Try to accelerate quickly and see it the engine cuts out as it is running out of gas . If it does change the filter . Hope this corrects the problem

Dec 14, 2014 | 2004 Hyundai Elantra

1 Answer

Will a egr valve cause rough idle


Yes the car won't run properly with a bad EGR valve and will use a lot more gas as well.

Jul 01, 2014 | Oldsmobile Cutlass Ciera Cars & Trucks

1 Answer

Acceleration problems ,at hiway speeds, needing more speed car downshifts sputters misses then eventually snaps backto normal whats up?


Ok. I'll give you my best guess, although I am not a Dodge Stratus expert. Based upon your description of the problem, I am to assume that the vehicle has problems accelerating up to speed, but once there, cruises ok unless you are going uphill or need to accelerate quickly, then power falls off rapidly and acceleration returns very slowly. If that is accurate, I would suspect the EGR valve. This is because at ihighway cruising speeds the EGR valve is pretty much wide open, letting exhaust gases back into the intake. When you need to accelerate, pressing the accelerator results in intake vacuum drop. This is partially compensated for by closing the EGR valve. If the EGR fails to close or sticks partway open, the exhaust gases will lower intake vacuum even further, and rob engine power. This can also cause the onboard computer to force a downshift to the transmission, as vacuum sensors are used to determine engine loading and the need to reduce gearing. In addition, a partially open EGR valve can cause erratic idle as it affects static intake vacuum (EGR is normally closed at idle) and the onboard computer must continually compensate, resulting is unstable idling.

Dec 04, 2011 | Dodge Stratus Cars & Trucks

1 Answer

Is the idle air valve an acceleration problem? It started accelerating it self now that its getting colder. Is it like the choke in older models?


No to both questions. The idle valve is only for idle control, letting in more or less air as idle conditions warrant, to keep engine at proper idle RPM. The old choke would reduce air supply on a cold engine to allow starting with a richer gas mixture. That function is taken over by the computer in injected cars by allowing longer injector pulses to give richer mixtures in cold engines. Once warm, the 02 sensor controls fuel trim through the computer.
By "accelerating itself", do you mean your idle is higher now that it's colder outside? I suppose it's possible if the idle valve is out of calibration, it might cause that. It is computer controlled, so proper diagnosis of the idle control valve requires a multimeter. The throttle position sensor should also be looked at for a high idle. Good luck.

Nov 05, 2011 | 1989 Oldsmobile Cutlass Ciera

1 Answer

Starts great idels great give it gas and it dies


This is probably an engine using a carburetor. If it starts and idles good and dies when the accelerator is pressed it is probably the accelerator pump on the carburetor. The accelerator pump supplies the fuel to operate the engine in this transition period from idle to part throttle until the venturi effect catches up to draw the necessary fuel the engine needs to continue running at the current demanded rate of speed. If the butterflies are opened and there is not sufficient fuel squirted into the engine when larger amounts of air are in demand it starves for fuel and thus stalls.If it is fuel injected then you have other problems, but my guess is it is a carburetor version. Ford went to fuel injection in 1990. You can just purchase the power valve if needed. You don't need the complete kit. Good luck

May 10, 2011 | 1989 Ford F 250

2 Answers

I have a 93 honda del sol manual when the car has been turned on it accelerates by itself and it has a check engine light dont now what is wrong with it


You probably have a bad Idle Air Control Valve (IACV). In fuel injected carburetors when the throttle valve is closed the IACV opens and closes to control the idle speed. If it malfunctions the engine may rev up allowing the car if in gear to accelerate on its own . When I had a bad IACV in my Mitsubishi Lancer it would drive down the road at 50 mph with out touching the gas pedal. Fortunately, it could be slowed down by using the brakes (unlike the Toyota stories).

Nov 07, 2010 | Honda del Sol Cars & Trucks

2 Answers

1990 4Runner, 3.0 L engine, won't hold idle, wants to stall, no power. Replaced Mass air flow valve sensor, replaced fuel pump, distributor cap and rotor, plugs. It has good fuel flow but only runs well...


Have you looked at your idle air control valve What is it? This is an electrically driven valve that allows additional control over the throttle at idle Where is it located? The IAC is located on or adjacent to the throttle body and consists of a small device held on by two bolts with an electrical connector.
How does it work? When the throttle is closed the throttle plate closes off any air from the intake manifold. In order to stop the engine from stalling due to lack of air the IAC opens a small valve allowing air to pass from the air ducting to the intake manifold. Often the IAC components consist of an air inlet port in the inside wall of the throttle body, immediately in front of the throttle plate, with a similar exit port behind the throttle plate. Connecting the two ports is a motor driven valve. When the valve is opened air effectively by-passes the closed throttle plate to maintain the engine at idle. The IAC also augments the throttle when additional power demands are put on the engine such as steering.


Symptoms of faulty IAC

  • Poor starting: If the IAC fails to open or the inlet/exit ports are clogged shut with carbon the engine may start and then promptly stall. The engine can be kept running by pressing the accelerator. However any additional demand on the engine such as power steering or putting the car into drive (automatic) will cause the engine to stumble badly and often stall.
  • Engine cut out: Even with the engine warmed when the vehicle is stationary such as at a red light the putting of the transmission into of 'drive' to pull away before the accelerator is pressed can cause the engine to stall. (Note this differs from the TPS fault which causes engine stall due to the accelerator being pressed too quickly)

How to check? Physically remove the IAC but keep the electrical connection to it. Temporarily block off the now open ports on the throttle, turn the engine on and examine the IAC valve action in response to additional loads (power steering inputs etc). The valve should open and close according to demand.

How to fix? If the motor of the IAC has failed then replace the IAC. If the valve is gummed closed by baked oil and carbon then clean it thoroughly with carburetor choke cleaner spray and a cloth. Similarly if the entry and exit ports on the throttle body to the IAC look blocked again clean them out thoroughly.

Jun 03, 2010 | 1990 Toyota 4Runner

1 Answer

In park the engine dies; only will run if given gas


It sounds like there is a problem with the Idle Air Control (IAC) valve. Its job is to open and let air into the manifold when the throttle is closed at idle. If it does not open, the engine dies at idle. The IAC is mounted on the throttle body. Possibly the valve is clogged or stuck, in which case it could be ok again if it is removed and cleaned. Or it is broken, and needs to be replaced. Or, there is a problem with its electrical connection, that needs to be traced. Good luck, let me know if you have any questions.

Mar 30, 2010 | 1993 Chevrolet Lumina

1 Answer

PO171 OBD-II Trouble Code " System Lean To Bank 1


Check PCV valve and be sure it is not stuck open.  Check for vacuum leak at intake manifold.  

Dec 28, 2008 | 2000 Jeep Grand Cherokee

1 Answer

PO171 OBD-II Trouble Code Engine Rough Idle When Under Load


Check EGR valve. Also check all injector pulses with NOID light especially when vehicle is stumbling. It may be computer related. Get back to me if you need more help. Good Luck

Dec 28, 2008 | 2000 Jeep Grand Cherokee

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