#1 cylinder misfiring
 

My '01 ranger suddenly started running rough. I figured It was misfiring so I took it to the auto parts store. They did a diagnostic and it said that #1 was misfiring. I bought plugs and will replace all of them tonight. Does that seem like the problem? I am hoping someone has had similar circumstances

RE: #1 cylinder misfiring
 

I changed out the spark plugs and it did not fix it. I changed the wire for the #1 cylinder and still no change. Any suggestions??

RE: #1 cylinder misfiring
 

are you getting spark at the plug? check the injector signal with a noid light.

RE: #1 cylinder misfiring
 

Thanks I will check the spark. I have never heard of a noid light. can you get them at most auto parts stores?

RE: #1 cylinder misfiring
 

The plug is getting spark. Does that make it an injector problem?

RE: #1 cylinder misfiring
 

Yea it might be the injector, open wire, or even the ECM. The noid light is just a test light for checking the injector signal.

http://www.toolsource.com/ost/produc...W7U90E50490B66

RE: #1 cylinder misfiring
 

I will try that out. If the light is off would that be the wiring most likely? The vehicle has 65k so it is probably not the injectors I hope. Thanks for your help cctxfish!!!!!

RE: #1 cylinder misfiring
 

probably ECM, my guess, you can tie it into another injector signal

RE: #1 cylinder misfiring
 

It was the ecm!!!! They called it the ignition coil but I think it is the same thing. None of the auto parts stores in town had the part so I had to pay the dealer $120 for the part. ouch!! But it was fixed a lot cheaper than having it serviced. Thanks for your help cctxfish.