Question about 2001 Saturn SL

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My car 2001 sl1 is going up and on her idling, no check engine is on, getting a tapping noise think it is in motor but not sure. sometimes its there and times you can hardly hear it. how can you check if an injector is firing or not?

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I think it is the vacume leak too, but you wanted to know about checking the injectors.. easy. if you have a stethoscope( 10bucks at store) place it on the injector and listen for clicks, do this on each injector to compare.. no clicks is bad injector or wiring or possible ecm.. swap injector with known good one to verify.
you can also use a screw driver in place of a stethoscope, but not as cool to use.

Posted on Oct 14, 2015

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Notorious for intake leaks, use propane around the engine and listen for the increase in idle and try to pin point where the vacuum leak may be. May even be just a vacuum hose leaking. :)

Posted on Oct 11, 2010

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1 Answer

Possible lifter knock, been very cold here in midwest. runs fine in cold weather. warming up and i get a knock from engine. removed oil cap and does not really get louder ?? does go away and comes bac


Your hearing lifter noise common in most cars in cold weather I have a 2001 sc1 same engine as yours here's how to get rid of that ticking sound go buy a quart of Lucas synthetic motor treatment change your oil and leave it 1 quart low add the Lucas synthetic oil stabilizer within 1 week you will not hear the noise agian reason your hearing the noise is there's no oil at the top of the engine on a cold start oil when cold is thicker hints why your noise in your engine what Lucas does is eliminate the dry start by the way my engine has 288,000 and does not use a drop of oil after you use this product you should use it every oil change you will see your car will thank you regards Chris

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1 Answer

After the engine start running for sometime it starts shaking.


hi this could be a few things, i would check your idle as a very low idle will cause engine shaking when the engine is near stalling, idle should be around 700rpm approx when warm. If that checks out all good check the leads and that one is not getting worn and causing a misfire or a vaccum hose is not off, both will cause similar problem. The last thing i can think of is a broken engine mount causing problem as when motor idles or runs at a certain rpm it will shake harder and may be the cause aswell

Jun 08, 2011 | 2001 Subaru Legacy

1 Answer

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First, if the noise is from the upper part of the engine and is more of a tapping than a knock, likely you have a problem in the valvetrain, most often a bad lifter or worn rocker arm. If the noise is low, deep inside, the noise is from a bearing. This is generally accompanied by lower than normal oil pressure. Regardless of the underlying cause, correcting the cause will not stop the knock. To do that correctly, the engine needs to be removed and all crankshaft bearings and the crankshaft itself need to be replaced (crank can sometimes be "undercut" and thicker bearing shells can be used depending upon the amount of wear.) If caught very early, sometimes only one bearing can be replaced in-car, but in 99% of all cases I have ever seen, most will fail again, sometimes more severely if done this way.

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any parts store sells aftermarket ones fairly cheap.....Lee

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check and make sure air filter is ok, and there are no restrictions in hose to throttle body, check iac (idle air control.

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1 Answer

Racing engine


The idle air control motor is likely the problem. It is located on the throttle body. Also be sure to check any and all vacuum lines while it is doing this. If you hear a hissing noise, try to find out where it is coming from.

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Check Utube for lifter tap, valve tap, and rod bearing noise. If you pull each spark plug one at a time, plugging it back in after each one, the tapping will go away if it's a rod bearing. At any rate, on your next oil change add some valve-medic or similar additive for valve noise. Make sure you follow direction or you will get massive lifter tap if you pour it into a cold engine.

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