Question about 1997 Chevrolet Cavalier

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EST OFF HI, I would like to know what I need to check when the light is on telling me that EST is OFF . Please help!

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  • xraykid1218 Oct 10, 2008

    The ETS is off light is on also the radiator icon is on also what does this mean!

  • AnnVan978 Nov 13, 2008

    My light is also on. I also have a problem of the car stalling and hesitating. My vehicle is a 1997 Pontiac Grand Am

  • yadayada
    yadayada May 11, 2010

    Is this the traction control?



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Hi ,my ets light was coming on and i was loseing power everytime i would try to go anywere,i would have to turn around and go back.well i had to have a $713,00 sersor moldum put in .
take it to autozone they will cheak it free or it will be 37,00 at deler good luck.

Posted on Jun 13, 2009


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What causes Durashift EST warning light to come on

Please see this exchange of information in a forum about your car:

Durashift EST Warning Light Loss of Drive Ford Fiesta Club

It may get worse, and cause you to not be able to drive your car. It's also an expensive repair, if you can't get it done on warranty.

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I have a 2000 cavalier,fuel pump is working,filter is clean,relay is working,will only start with carb cleaner?any suggestions,tks

You need to pick up some noid lights to check injector pulse if light blinks that's good next check the fuel pressure it should be about 50 psi just est pressure if @ 30 psi car will not start. Fuel pump or regulator. Now if you can't get noid lights use a test light on wires to injector s key on hook end of test light to neg side of battery one wire should be hot now swap ends @ battery to pos side the wire that had no power test that wire have some one try to start car if light blinks it good . The noid lights gust make it easier .I will follow this post if you need help . Please rate my help

Nov 24, 2014 | Cars & Trucks

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Mazda 6 2004 auto, hold light blinks and engine check light stays on

It could possibly be an emission problem or ur transmission. Most likely your transmission especially if theres a lot of miles. With a problem like this there is no specifics to truely point out what it is. I suggest taking it to a mechanic that can plug it into a computer and tell u the code of the problem and then go from there

May 03, 2013 | 2004 Mazda 6

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Service Engine light is on, gas milage is poor getting est. 9mpg city (average 1990 dakota est. 20 mpg city) I put in a new airfilter in car, did a oil flush, changed oil and oil is still clean after 50...

if you have'nt replaced those spark plugs and wires lately, you need to.and also, lucas fuel treatment, in my personal opinion,is the very best for unclogging fuel lined and being below a 1999 model and your check engine light is on, you can have it coderead for free if you're near anautozone or advance automotive parts store. they will code read it and tell you why that check engine lights coming on.hope this helps and thank you for choosing

Nov 23, 2010 | 1990 Dodge Dakota

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I have a 1992 gmc sonoma 2 wd 4.3L throtle body i am getting the service engine soon light and I checked the codes and I get number 42- Electronic spark timing bypass circuit or EST circuit is grounded...

CODE 42 Trouble Code 42 indicates that there may be a malfunction in the Electronic Spark Timing (EST) system.
During cranking, the timing is controlled by the ignition module while the ECM monitors the engine speed. When the engine speed exceeds 400 RPM, the ECM sends a BYPASS signal to the ignition module which switches the timing to ECM control. The ECM calculates what the timing should be then "tells" the ignition module via the EST circuit.
An open or ground in the EST circuit will stall the engine and set a Code 42. The engine can be re-started but it will run on ignition module timing.
The conditions for setting this code are:
  • System in BYPASS mode but the ignition module is still controlling timing
    - or -
  • Engine speed > 600 RPM with no EST pulses (ECM controlled timing) going to the ignition module for 200 msec.

Typical causes for this code include:
1) BYPASS line is open or grounded
2) EST line is open or grounded
3) PROM or CALPACK not seated properly in the ECM
4) Poor connections between ignition module and ECM
5) Poor routing of EST harness and/or poor quality ignition wires (EMI induced electrical noise)
6) Faulty or incorrect ignition module
7) Faulty ECM

Thank you for using fixya and keep us posted

Oct 10, 2010 | 1992 GMC Sonoma

1 Answer

Hi, i was messing with the Click light bulb and i

you popped a fuse check them all it may not be labeled as one of the items that dont work

Apr 24, 2010 | 2004 Infiniti G35 Sport Coupe

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Nissan Maxima 1996 issues-sensors

Dear Gandhi
1) You better check the 'Idle control relay' - and pray this is not your computer - who may be shorted ( The Computer that govern all elec. functions in the car - is also getting signals from your Mothor Mounts' to ensure a more balanced ride' If one or more of the Motor Mounts ( There are 3 ) are defective - they send a signal to the computer - and the yellow light ( Check engine soon) - will appear'
2) A Computer can only be fixed by a Nissan dealer ( est. $750 ) 3) The Idle control valve - can be adjusted too ( Again - by a Nissan Dealer only .
4) It is NOT an easy problem nor cheap . In short - your best bet is with the dealer - and ask them for a diagnostic ONLY ( est. $100 ) Don't tell the dealer what YOU think or did .......just tell them the 'Yellow light comes on' .......they'll take it from there.
Sorry I don't have better news today .

Best of luck

Apr 15, 2009 | 1996 Nissan Maxima

1 Answer

Trying to find my EST connector in my 1980 corvette.

If you have this engine option, you'll have a MAP sensor, a TPS and an O2 so it should be pretty easy to confirm this option. The EST wire should come out of the distributor, you can follow it from there to the connector. All of this aside, my favorite way to time one of these with any system, is to get an advance timing light, dial up 42 degrees, bring the engine up to 3200 rpm, and twist the distributor until you see TDC line up at the 0 mark on the timing cover. Now you know you have 42 degrees advance "all in" at 3200 rpm and you can go back and check your idle advance to determine if something is hanging up in the system.

Apr 01, 2009 | 1980 Chevrolet Corvette

1 Answer

1991 chevy S 10 EST not working

Check out the Knox sensor & or the Blue wire going to it if it is Grounded , the timing will not Advance, Knox sensor is there to detect knock then it grounds if it catches a Knock to Prevent
Pre Ignition Ping-SPARK KNOCK-

Dec 08, 2008 | 1991 Chevrolet S-10

2 Answers

Need help imediantely please

If the check engine light is on, that means there is a code stored in the computer's memory. You need a scan tool to access that code. Any of the major auto parts stores such as Pep Boys, Autozone, etc. can scan the system for free and let you know what code is stored.

May 26, 2008 | 2000 Honda Odyssey

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