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doanuts
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Oct 29, 2011, 2:30 PM
Post #1 of 20
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1990 mazda miata
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I need help. My 1990 mazda miata check engine light comes on while driving then when i let off the gas it goes away
Shane doan
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Sidom
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/ Moderator
Oct 29, 2011, 3:24 PM
Post #2 of 20
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Re: 1990 mazda miata
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Have codes read & come back & post the numbers.....Most parts stores will do this for free
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doanuts
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Oct 29, 2011, 3:34 PM
Post #3 of 20
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Re: 1990 mazda miata
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The engine light doesnt stay on will it still show a code if the lights not on? It only comes on while driving. But i let off on the gas pedal and the engine light turns off. This happens time to time and sometimes multiple times while driving. Iv never owned a miata and jus bought this one a couple days ago. The speedo says 390,xxxmiles but the engine dont look like thats on it or even the car itself
Shane doan
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 29, 2011, 4:08 PM
Post #4 of 20
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Re: 1990 mazda miata
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Yes, the code should be stored in memory but you may have to pay a shop to do that one since it's OBD1.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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doanuts
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Oct 29, 2011, 4:11 PM
Post #5 of 20
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Re: 1990 mazda miata
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Ok sweet thanks ill get back with the codes if they dont kno what it is.. do you know what the ticking noise in the top end might be? It isnt always there is comes and goes too
Shane doan
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Hammer Time
Ultimate Carjunky
/ Moderator
Oct 29, 2011, 4:19 PM
Post #6 of 20
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Re: 1990 mazda miata
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You'll have to make it louder. I can't hear it.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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Discretesignals
Ultimate Carjunky
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Oct 29, 2011, 4:58 PM
Post #7 of 20
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Re: 1990 mazda miata
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That one you can retrieve trouble codes without a scan tool. There is a diagnostic connector under the hood. Jumper TEN and GND together in the terminal and turn the ignition on. The check engine light will flash the code(s) in two digit format.
Ticking noise could be from the valve train. The hydraulic lash adjusters (HLA) are supposed to take up the play in the valve train as things wear. With the mileage the valve train is probably worn out or you could have HLA problems. Change the oil and make sure you use the correct viscosity (10W-30) to see if that helps.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Oct 29, 2011, 5:09 PM)
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doanuts
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Oct 31, 2011, 1:08 PM
Post #8 of 20
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Re: 1990 mazda miata
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I did the thkng and it blinked once then twiceso m guessin thats a 12 and the book at auto zone said it doesnt apply to my car
Shane doan
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Discretesignals
Ultimate Carjunky
/ Moderator
Oct 31, 2011, 5:04 PM
Post #9 of 20
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Re: 1990 mazda miata
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Code 12 means the engine computer detected an open or short in the throttle position sensor circuit.
This means you need to monitor the throttle position sensor voltage to see if you have a defective TPS, a wiring problem, or a computer issue.
To check the throttle position sensor, you need to use a volt/ohm meter.
This video goes over TPS diagnosing. The TPS operation is the same on most vehicles.
http://www.youtube.com/...&feature=related
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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doanuts
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Nov 6, 2011, 4:32 PM
Post #10 of 20
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Re: 1990 mazda miata
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I wud like to know if fuel injector number four, cracked and flooding piston four, would also make piston number 2 not work
Shane doan
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Discretesignals
Ultimate Carjunky
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Nov 6, 2011, 4:46 PM
Post #11 of 20
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Re: 1990 mazda miata
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You have too many threads open on this vehicle for the same problem. We are telling you what to test and your not giving us any feedback. With the other threads, your making it confusing and leaving other hanging in the wind. Please keep it in the same thread.
Link to another open thread:
http://autoforums.carjunky.com/...4035;t=search_engine
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
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doanuts
User
Nov 6, 2011, 4:54 PM
Post #12 of 20
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Re: 1990 mazda miata
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Sorry m jus getting use to this site and m kida comfused myself.. i dont have access to an ohmeter can u use one in autozone? Sorry fer the comfusion i jus bought this car m jus tryn ta figure out what is goi. O. With it. And need to learn this site better. Thank you for your help if u have an answer to the last question ill only post on this one link. Can u delete one after youve posted it?
Shane doan
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 6, 2011, 5:10 PM
Post #13 of 20
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Re: 1990 mazda miata
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Is that what happened? You have a leaking injector on #4? Did you see if the regulator is leaking?
Is #2 cylinder flooded also?
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 6, 2011, 5:12 PM)
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doanuts
User
Nov 6, 2011, 5:28 PM
Post #14 of 20
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Re: 1990 mazda miata
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I did test with tube from intake manifold off nothing squirted anywher from the regulator. Yes i pulled all plugs and plug 2and 4 wer wet with gas the others were dry. When i pulled all the injectors out the one for piston/plug 4 was cracked on the end. Injector 2 had a scratch idk if its a crack. So 2/4 are getting flooded 1/3 are fine and still igniting. I checked for spark from the coil pack and it was good.
Shane doan
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Discretesignals
Ultimate Carjunky
/ Moderator
Nov 6, 2011, 5:35 PM
Post #15 of 20
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Re: 1990 mazda miata
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I don't think that a cracked injector in #4 would flood out #2, so it probably wouldn't be a bad idea to replace them both.
In fact, if you have the money, it probably wouldn't be a bad idea to replace all four injectors just in case #1 & 3 let loose later.
If the injectors were leaking fuel into the cylinders, its possible that those two cylinder could be washed out. That means they may have no compression, so you'll have to squirt a little bit of oil in those cylinders to get the compression to come back up while cranking the engine with the plugs removed, all injector connectors unplugged, and coil unplugged.
You don't want gas or spark going on while your trying to restore compression while cranking the engine.
Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.
(This post was edited by Discretesignals on Nov 6, 2011, 5:43 PM)
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doanuts
User
Nov 6, 2011, 5:40 PM
Post #16 of 20
(9010 views)
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Re: 1990 mazda miata
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Yes hopefully this is the only problem i had ordered some racing injectors all four
Shane doan
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Nov 7, 2011, 3:54 AM
Post #17 of 20
(8997 views)
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Re: 1990 mazda miata
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Shane: I suggest staying OE for replacement parts or could confuse the fix - not certain but may open Pandora's box requiring other alterations to accommodate doing that. Yes it's now an old car but not old enough IMO to fool with things aftermarket, performance or other things,
T
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doanuts
User
Nov 23, 2011, 9:00 PM
Post #18 of 20
(8950 views)
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Re: 1990 mazda miata
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Hey guys i have two questions..1 is when i put cold air intake what happens with the mas air flow sensor plug thats pluged into the stock intake box? What do i do with it and with it not pluged in what will it do?.....2nd i need new wheel bearings in front my car is the 1990 base model, does it have ABS? the bearings i found come together with lugnut bolt hub assembly i need to know wether my car has abs or not....thank you!!
Shane doan
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Sidom
Veteran
/ Moderator
Nov 23, 2011, 10:24 PM
Post #19 of 20
(8944 views)
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Re: 1990 mazda miata
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You need the MAF sensor, the engine won't right without it....If that kit is for that model, there should be a way to mount it in to your new system. That part can't be eliminated.
For your wheel bearing, just look at the dash. There should be an ABS light that comes on for a few seconds & then goes out when the car is started..... Or you could just look at the hub assembly, see it there is a sensor with a wire going to it, also there should be an tone ring on the axle....
If you have any issues with the bearing start a new thread......
So what was the final outcome with the running problem??? Did you get it fixed??? What did you do???
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doanuts
User
Nov 23, 2011, 10:33 PM
Post #20 of 20
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Re: 1990 mazda miata
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Thank you. Ther was a cracked fuel injector and the wire harness for the fuel injectors was bad. As for the white smoke i had changed the oil and put the 5 litter oil change jug into the engine when the engine only takes 3.2 litters off oil. Changed oil again runs great. Still havent figured out the check engine. It blinks once then twice im taking that as a 12 but anywhere i go they cant figure out what it is.
Shane doan
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