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There is a test to check for poor insulation to grd on this wire . It is a 500volt megger but most people don't have access to one or don't know how to use it, so instead replace it . Even a new pcm won't overcome a bad wire .
Injector wires on no 6 should be checked also .
There is a test to check for poor insulation to grd on this wire . It is a 500volt megger but most people don't have access to one or don't know how to use it, so instead replace it . Even a new pcm won't overcome a bad wire .
Injector wires on no 6 should be checked also .
Thanks for the info. Unfortunately I don't believe I have access to that piece of test equipment. After finding out about it tho I might look into trying to get my hands on one.
I think flagship was the one with poor customer service when or if you get a bad one.
Any of you guys know of any other companies that sell programmed pcm's with keys? Wouldn't mind researching a couple different companies before committing to buying one.
To rule some things out .
1. ohm that wire to grd and move harness at same time look for any change
2. pull drivers side valve cover and inspect rollers you can pop with rollers out with a screw driver there is a you tube method for that . There are three per cyl
3. that will give you an idea about sludge . Valve cover gaskets are reusable and you are lucky no 6 is right there easy to get to . I never really looked at pulling lash adjusters with cam in there but once I pulled them out new will go back in . If you reuse old ones all parts must go back in same exact slot .Prime lash adjusters-- take pictures .
4. thoroughly clean out spark plug tip hole on no 6 with carb cleaner, that carbon can damage any plug you put in there .
This is a cheap way to cover bases as I don't believe in throwing money at a problem if there are labor things you can do .
In the end you may have to do pcm .
I will really like to follow this to the end as I'm still learning till I die .
Warning using a megger can damage pcm, never megger electronic parts, just isolated wires . 500 volts can punch thru electronic parts .
Last edited by redfishtd; 04-07-2017 at 10:57 AM.
Reason: add
To rule some things out .
1. ohm that wire to grd and move harness at same time look for any change
2. pull drivers side valve cover and inspect rollers you can pop with rollers out with a screw driver there is a you tube method for that . There are three per cyl
3. that will give you an idea about sludge . Valve cover gaskets are reusable and you are lucky no 6 is right there easy to get to . I never really looked at pulling lash adjusters with cam in there but once I pulled them out new will go back in . If you reuse old ones all parts must go back in same exact slot .Prime lash adjusters-- take pictures .
4. thoroughly clean out spark plug tip hole on no 6 with carb cleaner, that carbon can damage any plug you put in there .
This is a cheap way to cover bases as I don't believe in throwing money at a problem if there are labor things you can do .
In the end you may have to do pcm .
I will really like to follow this to the end as I'm still learning till I die .
Warning using a megger can damage pcm, never megger electronic parts, just isolated wires . 500 volts can punch thru electronic parts .
Thanks for the input.... I have already checked the wires with an ohm meter but across the wire and not to ground. So i will definitely try that. As far as pulling the valve cover, if it was something to do with a valve or roller wouldn't it be making some kind of noise? Engine runs pretty quiet with no concerning noises. Also as far as the sludge goes i doubt there is an issue there as well. I do oil changes every 5000 km with full synthetic castrol edge 5w20 oil and always have. Oil is still very clean when i do my oil changes. I have also taken spark plugs out and cleaned them well with cleaner before putting them back in. At this point I dont believe putting a new pcm in would be just throwing a part at it and wasting money. I have already spent hours troubleshooting this issue with no luck in finding an alternate solution.
That's what the pcm supplies in pulses . a Wire to wire short is less likely. Two sets of insulation you see .
You are right about the rollers and lash adjusters to a point , mine did make a noise when one intake roller kicked to side . But the rollers tend to wear at the center and if enough wear the cam would not push valves down, a frozen lash adjuster may not make noise .
My engine always had syn but it was varnished when I opened her up not sludged . But just before I shut her down I engine flushed her and boy did that make her throw codes on the phasors and timing . I expected that but all new parts were going in .
If you are missing the standing 12volts on the hot side of either the injector or coil shes gonna have your symptoms.
I wish I had a good pcm builder for you but I haven't had to do that .
That's what the pcm supplies in pulses . a Wire to wire short is less likely. Two sets of insulation you see .
You are right about the rollers and lash adjusters to a point , mine did make a noise when one intake roller kicked to side . But the rollers tend to wear at the center and if enough wear the cam would not push valves down, a frozen lash adjuster may not make noise .
My engine always had syn but it was varnished when I opened her up not sludged . But just before I shut her down I engine flushed her and boy did that make her throw codes on the phasors and timing . I expected that but all new parts were going in .
If you are missing the standing 12volts on the hot side of either the injector or coil shes gonna have your symptoms.
I wish I had a good pcm builder for you but I haven't had to do that .
I did check the 12 volt supply to the injectors and coils. It was all good. What seems weird is that when I checked the signals with the snap on vantage everything looked good except for the #6 ignition coil signal. The signal was there but it's like there was all kinds of noise following the signal. If I have a chance I will hook the vantage back up and back probe a few and take pictures and show u what I mean.
04-06-2017, 02:04 PM
Eliminate no 6 pcm wire by replacing it
