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I recently did a new head job on a 94 sohc 1.9 saturn engine. Problem= car will not idle at all and the throttle cannot be held at any rpm;s. It will either go to fast or slow down. help

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  • Saturn Master
  • 2,494 Answers

Check throttle body MAP sensor hose connected check for air leaks manifold area.

Posted on Nov 20, 2014

  • jeff5may32 Nov 29, 2014

    i suspect a vacuum leak or leaky head.



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Posted on Jan 02, 2017

  • 12 Answers

SOURCE: rough idle / engine surges until power is applied

Sounds like a possible vaccume hose leak?

Posted on Feb 07, 2009

  • 453 Answers

SOURCE: throttle/Idle/running problem - wants to run too fast, or stall out

RPM's up and down check EGR valve and sensor. EGR valve and sensor control idle. That's why your getting the surging on rpm's and this could be giving out the other codes. If mass flow was bad car will not start and the same for the map sensor. O2 sensor measures gas and air for right mixer. TPS controls 0-60 speed as in throttle respons.

Posted on Apr 28, 2009

  • 14036 Answers

SOURCE: High engine idle 94 Mercury Cougar

replace throttle body gasket. first check to see if carbon has built up around the throttle valves in throttle body if so remove and clean it with throttle body cleaner.and a old tooth brush. besure to remove all electrical components or any thing that plastic or rubber the cleaner will destroy it.

Posted on May 18, 2009

  • 15 Answers

SOURCE: 1987 volvo 244 intermittent fast idle floods after shut down

The coolant temp sensor sends signal to the ECU and the ECU adjusts the idle RPM. When the coolant is cold, the engine requires more fuel to sustain idle with thick oil (oil gets thicker & more viscous when cold). This makes the engine to idle at faster RPM but it should settle down to 850 RPM or so after the coolant warms up. The sensor is nothing but a thermistor; a device that changes electrical resistance according to the coolant temperature.

Posted on Jun 16, 2009

  • 5 Answers

SOURCE: 2500 to 3000 rpm idle

Change your Thottle positioning Sensor. My 93 lesabre did the same thing and i changed the TPS and it stopped.

Posted on Jun 25, 2009

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No power on exceleration smells like gas hs a hard time pulling hills 94 saturn sohc 1.9

Start by replacing the air filter and checking the operation of the fuel pressure regulator. Have the stored codes read out of your ECU, either by an auto parts store or a local mechanic, in order to ascertain a starting point for diagnosis.

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The ECM maybe stuck, disconnect the battery and wait 5 mins then reconnect.

Other things that normal cause high rpm at idle:
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  • vacuum line to brake has a leak.
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  • the IAC is bad. Which is on the throttle body.
  • the throttle plate sensor is bad, just unplug it and see if the rpm goes down. If it does, replace the sensor.
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1995 SC1 280K oil burner. Kept full. Previously 41 mpg, now 27 mpg over 1 year span. Oil smells like gas and so does the exhaust. Extreme loss of power. Will not idle. Runs rough at lower rpm, but...

If you are keeping the car forever, swap the engine with a rebuilt one. there are many for sale out there.
about $2k for a rebuilt with core credit. if you are really just keeping it for a year or two until the front "frame" collapses, buy a used engine out of a junkyard, look until you find one with less than 100k on it. there are many for sale on eBay but the shipping will kill you and you most likely have junkyards closer to home.

note if you have an SC1 means SOHC so you have to have a SOHC donor vehicle. SC1,SL1, or SW1
the engines were the same 96, 97,98 i believe. but do not get an older engine.

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You should be able to inspect the tank to see if there is any damage around the place where the rubber seal on the cap fits. If there is, it will need to be replaced.

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How do i know if it is my ECTS or IAC for high reving in my 98 saturn sl sohc

The engine coolant temp.sensor and idle air control will usually make the check engine light come on if they go bad.If you have high idling then check for vacuum leaks or sticky throttle.

Nov 30, 2009 | 1998 Saturn SL

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Sounds like a bad idle air motor (That controls idle) But you must pull compiter codes first (The computr tells it what to do)

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If you removed the thrmostat, put it back in.FIRST

Sep 13, 2009 | 1999 Saturn SL

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Will not start after it stalls untill about 5-10 minutes

spray carb cleaner on the intake manifold near cylinder 1... common problem is the intake manifold gasket leaks vacuum causing a misfire...the not starting could be due to a faulty crank sensor

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2001 Saturn SL No. 1 Cylinder Mis-fire

Solved my problem: After more internet searching and consulting with my mechanic we determined it was the intake manifold gasket folding over into the #1 cylinder. This is common on Saturn engines. The gasket folds over leaving a leak in the vacuum system which causes the car to run lean. Check for a leak by spraying carburator cleaner around the #1 cylinder intake and you will hear the idle change if there is a leak. I had gasket replaced for $450 and car runs like new. My car is a 2000 saturn SL 1 with 60000 miles on it. Hope this helps someone.

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