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Engine idles rough throttle revs engine - Garden

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Change the spark plug if not done so yet
If that really does not help run some gumout in the gas too
It will clean out the fuel system too

Posted on Jun 05, 2010

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If timing belt is off can it cause a pulsing in the revs


If by "off" you mean that you suspect that the camshaft is out of time with the crankshaft by one tooth the answer is probably no. Most engines won't even run with camshaft timing off by a tooth. Or they will run with extremely rough idle and very low power. And the ignition timing will be almost impossible to adjust.

If by "off" you mean the timing belt is not on the engine, the answer is no. Engine won't start without a timing belt. But you do run a near 100% chance of causing severe engine damage if you attempt to crank the engine without a timing belt.

If by "pulsing in the revs" you mean that the engine seems to be running fairly smoothly but it will rev at normal idle then occassionally rev higher for a second or two, I would suspect your Throttle Position Sensor. This tells the engine what the throttle is doing. If the sensor is erratic the engine's computer will improperly think that the throttle has been depressed. A TPS is not terribly expensive and is very easy to remove and install.

Jun 05, 2014 | 1996 Honda Civic

1 Answer

My 96 honda civic rough starts dies when put in gear


Do the throttle body cleaning and re- learn idle speed control valve.

Mar 16, 2013 | 1996 Honda Civic

1 Answer

94 NISSAN START FIND BUT ROUGH IDLING


Sounds like dirty/clogged idle air control passages or a dirty throttle body.

Apr 05, 2012 | 1994 Nissan Maxima

1 Answer

Roaring engine when started


Sounds like your car is over fueling. My first quick look is to make sure your throttle return spring is intact and still connected. Next remove the air ducting between air cleaner box and throttle body so that you can see that the throttle plate is fully closed at start up. If OK then reinstate the temporarily removed ducting. Next I would check your fuel pressure relief (FPR) valve on the fuel line. When the engine is running remove the vacuum line attached to it and check for fuel dribbling from it or a strong smell of fuel. If the FPR is normal and healthy the engine would normally increase in revs for few seconds and then begin to idle roughly. Put your finger over the end of the disconnected vacuum line (if healthy the engine would resume normal idle after aout 5 seconds) and watch the side arm of the FPR for about two minutes. If fuel eventually spits out then change the FPR. Sometimes the diaphragm within the FPR which is acted on by engine inlet vacuum can split and the fuel behind it is sucked into the inlet plenum making the engine rev and idle roughly.

Feb 23, 2012 | Chevrolet Cavalier Cars & Trucks

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Rough idle, car has no ICV, idle control valve, so what now?


It will deffinitely have a form of idle control, sometimes it is part of the throttle body but there will be one... 100% certain.

Rough idle as in lumpy will not be an ICV related fault, as with ICV it will either have solid high revs or none at all.

It will either be an inlet vacuum issue - split hose, gasket, MAFS etc or an irratic voltage caused by things like a Lambda or worn throttle potentiometre

Describe the rough idle in more detail if you can, also are you UK or USA etc.

Do you know what cc and engine code your car is?

Dec 15, 2009 | 1998 BMW 3 Series

1 Answer

1999 mitsubushi eclipse shows p1390 engine code


have you had a recent timming belt if so get it re timmed

Jul 29, 2009 | 1999 Mitsubishi Eclipse

1 Answer

My 1987 turbo toyota supra will only rev up to 2500 rpm then cut out like a governer. when it drops to about 2000 rpm it will rev back up only to 2500 rpm. at an idle it runs rough


The throttle position sensor has an idle switch in it that tells the car's computer that the throttle is positioned at idle. If the idle switch sticks in the idle position, the computer will not allow the engine to rev more than 2500 rpm. In your case, I think the switch is stuck.

First, see if you can get the trouble codes to come up. Rig a jumper wire and jump between the "T" terminal and the "E1" terminal in the car's "Diagnostics" box. It is a small black box on the driver's side of the engine compartment near the battery. Open the lid and on the inside of the lid it has a map of the terminals.

Once you hook up the jumper wire, turn the ignition switch to on but do not start the car. If there are codes, the check engine light (orange) will blink the 2 digit code. It blinks the first digit, pauses, then blinks the second digit. The code for the throttle position sensor is code "41". That is, four blinks...pause...then one blink. If this code comes up, change the throttle position sensor. (If there are no codes, the check engine light will steadily blink once per second until you turn the key to off.) Don't forget to remove the jumper wire when you are finished.

Apr 10, 2009 | Toyota Tundra Cars & Trucks

1 Answer

94 blazer vortec 4.3 idle revs up and dont come down


check your Throttle Positioning sensor that should fix your rough idle the TPS controls the breather on the front of the engine its affixed to the right hand side of the throttle body just infront of the spyder on the V6 Vortec 4.3L Models

Nov 09, 2008 | 1994 Chevrolet S-10 Blazer

1 Answer

Rough idle


Have you had the throttle valve cleaned?

Here is the most common cause of surges and stalls, it is the idle speed control air-bypass valve and throttle valve, they get full of gunk over the miles and cause idle issues (stalls) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Oct 20, 2008 | 2001 Mercury Sable

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