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How does the crank case breather work and what does it do?

Engine turns over good with Sparkplug removed but hard to turn over when plug is replaced. When the engine does start it runs great.what can I do ?

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Ok sir lets do this in steps . make sure you have a good battery if its good check all mounting points of your battery wiring(the connections to the battery and to the frame and to the solenoid and to the starter. make sure the motor is mounted tight to the frame that is a ground also. check your exust and intake valve clearences if they are too loose it could cause the hard turning over. finally the starter if its worn out replace it. Hope this helps!

Posted on Dec 08, 2014

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Posted on Jan 02, 2017

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4 Answers

I drive a 95 toyota 4 runner.I would like to know the right way to check my sparkplug wires if working p roper.


You can fabricate a tester from a 6 inch long mongol pencil. Sharpen one end and drill a 1/8" hole in the middle. Now remove the sparkplug wire from each sparkplug and insert the pencil onto the sparkplug wire with the dsharpened end connected or touching the ground or any metal part of the engine. Start your engine and you should see sparks jumping on the drilled hole on the pencil which indicates that your spark plug wire is okay.

Nov 09, 2014 | Cars & Trucks

1 Answer

Will crank and run fine when engine is cold go for drive come back wont start, new battery1 will turn over just like no fire is getting through1


could be a number of possible faults.1/crank sensor not working when hot,trace this and pour cold water on it(dont do this if it is not by crank pulley as water isnt good for modules etc) and retry.2/sparkplugs worn,but usually they would fault more on cold start.3/fuel pump cuts out when run,try wacking tank from underneath and retry.though I would concentrate on nil spark caused by a faulty ignition module or crank sensor.
Next time it fails to start.pull off a sparkplug lead,make a quick test plug with an old(but working)sparkplug.pull the side wire away from the center electrode 5mm and insert into plug lead.earth ground the plug on its thread against metal on the engine.crank and check for spark visually,don't be tempted to hold the plug while cranking.if nil spark we will have to test further which is faulty sensor.if it sparks ok we will need to test for fuel.
testing for fuel is easy.
when it fails,unclip air filter housing,while engine is being cranked,spray an aerosol based carburettor cleaner into air duct to engine,it should start and run while spraying and stop when you stop spraying if fuel delivery is the fault.fuel pump will then need testing/replacing.
be careful not to spray onto ignition or any areas of spark

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I have a 2003 yamaha ttr 225. tring to set the timing ,question for top dead center what mark out of 3 do i use? on the sid it looks like I--I I what mark is top dead center?


remove the sparkplug then:
rotate the engine until all the vaves in the cylinder are closed (maximum exit air pressure at the sparkplug hole) then: place a pencil or, wire in the sparkplug hole and,rotate the engine forwards and, or backwards until the wire is at it's highest point (about to start back down) this will be tdc. (top dead center)

Jul 19, 2010 | 2003 Yamaha TT-R 225

1 Answer

1993 Plymouth Voyager will not crank


Remove the Distributor cap and watch the rotor as you crank the engine. If the motor is turning over and the rotor is not moving then you have a broken Timing belt. If this is the case the Belt broken while the engine was running. I can tell you from experience, I owned one of these and mine did the same thing, Every valve in the head is bent. The good news it is not hard to replace on your own and it can be done without removing the engine. The bad news you have to remove your head and have it serviced by a shop.

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1 Answer

I am trying to start my engine on my 1985 4runner it turns over but doesnt catch on.. what should I do..


'85's mostly had 4 cylinder engines, 22R, 22RE and 22REI. Remove a sparkplug wire and stick a sparkplug into the end. Hold the sparkplug, preferably with a well insulated glove, against a good metal part (exhaust manifiold will do, no paint or rust) nearby being carefull to stay clear of the fan. Now have someone turn the key and when the engine turns, see if a spark is jumping across the sparkplug your are holding...snap,...snap..snap....is what you should see and hear. If not, your ignition is not creating spark. Remove the center wire of the distributor and try to put the sparkplug on the end of that wire and repeat the previous test. If you get spark that means the distributor cap is not transferring the spark thru it to the wires that go down to your sparkplugs. Remove and replace the distributor cap and the rotor inside paying special attention to mark the wires and where they plug into the cap. The rotor only goes on one way, same with the cap. If you dont get spark coming to the center wire of the distributoe cap your ignitin module may be bad, a good time to have a shop run a test on it. Before heading to the shop, be sure to check your fuses. Maybe you should do that first as it is the simplest. If you have spark at the sparkplug and still no starting, a small amount of gasoline poured into the intake ( please dont pour a cup of gas into it! Just a spoonfull or so). With the sparkplug wires inplace, crank the motor. If it kicks and then goes back to cranking with no results, your fuel isnt getting to the intake. Could be a fuel pump (common) or a plugged fuel filter. The filter is easy, replace it. To test for fuel pressure you will need to locate the fuel line coming to the intake, carburated or injected, the inlet can be loosened and have someone turn the key on and you should see some fuel leaking around the fitting you only loosened. DO NO REMOVE IT-JUST LOOSEN. If you have fuel pressure your problem needs a mechanic. If no fuel pressure it's time to check the fuel pump thru the access panel under the backseat. BE SURE TO TIGHTEN THE INLET FUEL FITTING AT THIS POINT. Good luck.
REMEMBER- GASOLINE IS VERY DANGEROUS. DO NOT PERFORM THESE DIAGNOSTICS UNLESS YOU FEEL TRAINED ENOUGH TO DO SO AND ALWAYS WITH AN EXTINGUISHER ON HAND.

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2 Answers

The starter will turn the motor over but not start it


johnnymleder, Remove sparkplug from engine. reconnect sparkplug to sparkplug wire. Make sure sparkplug is in contact with engine cylinder head. If you don't see a spark when cranking engine over( in dark garage at night) then something will be wrong with the motor's ignition system and will require servicing it to restore operation. If you see spark then reinstall plug into the engine. Do NOT connect ignition wire!!! Crank engine for 15-25 seconds. Do you smell RAW GASOLINE at the tailpipe??? If NO you may have clogged fuel system. Have FIRE extinguisher handy at ALL times when performing work on any fuel system!!!! Good luck with repair!! 12fixlouie

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