Question about 2001 Chevrolet Blazer

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Resetting the check engine soon light

My check engine soon light is still on after my mechanic changed some fuel injectors and wires. He forgot to reset it and it would be easier for me to reset it than try and get a free moment with him. How do I reset by myself?

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You may have already done this but try disconecting the battery for a few minutes.

Posted on Apr 15, 2009

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I have a p0301code on my 1997 jaguar xj6 ,already change a coil and all the sparks plug but still got check light engine on, is there any way to turn off the light.


code p 0301 is misfire detected cylinder 1====causes --negine mechanical fault---wiring---ignition/ fuel--injector--ECT/MAF sensor--ECM
as most misfires are fuel related rather than plug problems , check/replace the injector

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Car idles rough, sometimes dies in reverse, it's worse in cold.


A cylinder that doesn't fire could be 1 of 3 things: no spark, no gas, or no compression.
Sure, it could be a bad injector, or clogged, but you should do some tests before buying an expensive new injector. You should first check the injector circuit on #2 cylinder. It's a pretty simple circuit, really. Each injector has 2 wires, a power wire and a ground wire. The power wire is one wire, which is spliced to each injector, and has battery voltage on it anytime the ignition switch is on or in "run". Each injector's ground wire is a separate wire going into the computer. When the computer internally grounds for a split second that injector's circuit, the injector sprays fuel out a tiny opening, a nozzle. You can check the circuit for #2, both the power wire and the ground side of the circuit with a test light. Post back and ask, if you want me to explain.
You also might want to check the compression in #2, just to assure you there is no mechanical problem causing a loss of compression in that cylinder.

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code p0300 refers to--random/multiple cylinder/s misfire detected...Causes---spark plugs---HT leads---injectors---ignition coils ---low compression ---wiring
code p0302 refers to cylinder 2 misfire detected Causes ---engine mechanical fault---wiring---ignition/fuel system ---ECT/MAF sensors ECM
code po303 refers to cylinder 3 misfire detected Causes Engine mechanical fault---wiring---ignition/ fuel system ---injector---ECT/MAF sensor ECM The common fault to all is the fuel/system ignition
I would have the injectors checked and have a pressure test done on the fuel manifold to check pump and fuel regulator valve.

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I have a 2004 3.9L Mustang with the "check engine soon" light on. I read the codes and 0300, 0301, 0305 and 0316 were up, while the car was still driving fine. Soon, it started to lose strenght, I bar


Best to read the codes first---code p0300 refers to random multiple cyl-- misfire detected causes-- spark plugs---HT leads--ignition coils--wiring.
code p0301 refers tocylinder 1-- misfire detected causes ---engine mechanical fault---wiring---ignition /fuel system ---injector---ECT/Maf sensor(Mass air flow) ECM.
code p0305 refers to cylinder 5 misfire detected causes ---same as 0301
code p0316 refers to misfire detected during start up -first 1000 rpms---causes--- engine mechanical fault---wiring----ignition/fuel system---injector. I would run a fuel system pressure pressure test as the common causes here is the fuel/injectors

PLEASE RATE THIS REPLY FOR ACCURACY

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Have a 1998 dodge caravan with service engine soon light still on after fixing code 205 and 206. Tried to reset it but the light will not go off. I need to pass emissions soon. What do I need to do.


The symptoms for this code (both) will likely be a misfire and a rough running engine. Poor acceleration. The MIL will also be illuminated. The causes of a P0206 engine light code could be any of the following:
* Bad injector. This is usually the cause of this code but doesn't rule out the possibility of one of the other causes
* Open in the wiring to the injector
* Short in the wiring to the injector
* Bad PCM

Your possible solutions, first, using a DVOM check the resistance of the injector. If it isn't within specs, then replace the injector.
* Check for voltage at the fuel injector connector. It should have 10 volts or more.
* Visually check the connector for damage or broken wires.
* Visually check the injector for damage.

Also, if you have access to an injector tester, activate the injector and see if it operates. If the injector operates, then you likely have either an open in the wiring, or a blocked injector. If you do not have access to a tester, swap the injector with another one and see if the code changes. If the code changes, then change the injector.

At the PCM, remove the driver wire from the PCM connector and Ground the wire. (Make sure you have the correct wire. If you're not sure, do not attempt) The injector should activate
* Replace the injector

Hope helps.

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Try repriming your fuel system. On some diesels, when you replace fuel filters, you have to prime them. I dont see how that affects your oil though. Did you put all 15qts of oil in?

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