Low/Rough Idle Question

Hi @nashvillecat - thanks for the input. Confident I did not disturb the distributor alignment/positioning when taking multi meter readings.

Interesting read on the other spark plug thread though. That could possibly be my smoking gun. I am using NGK 7082 BPR5EGP at the moment and were recently swapped in when this whole issue started. I am also now running NGK 54404 plug wires and NGK 48862 coil.

Car used to have standard Bosch plugs, wires and a Jacobs High Performance Coil.

Let me know what you think about my parts replacement choices.

Before I redo all these parts again, I may just try air blasting the idle stops and then some carb cleaner.

Again appreciate help here everyone.
 
I still think that if it idled smoothly before the removal and reinstallation of the air cleaner and the parts changes, and now doesn't idle smoothly, that the change in idle is related to these activities. Is there any chance that the vacuum hose to the dizzy was switched from full manifold vacuum to ported vacuum during the work? Full manifold vacuum will give a higher idle RPM and cleaner burning at idle than ported vacuum.
 
Vacuum has not changed. Never removed the vacuum line at the dizzy going to the front carb.
Only touched the tube attached to the air filter housing to the T, which I now understand is part of the fuel evap system.
 

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So, I'm running the BP5ES plugs in my car, and when I was buying these I was advised not to get the BPR5ES plugs because the "R" in the part number stands for resistance. The resistance plugs were invented to avoid generating noise that was audible in the radio. I don't recall why that I was advised to avoid the "R" plugs, but you may want to ask around about that issue specifically and see if you get the same advice.
 
The challenge is availability of non-resistor plugs. I bought a set on eBay last time, but the availability is going down and price is going up. If you look on the NGK site they only list resistor plugs now.

Also, I am becoming reticent about buying car parts from Amazon and eBay, too many counterfeit parts being sold on those platforms.
 
E3_UK said:
Are both choke flaps fully open ?.
Click to expand...

Ohmess said:
So, I'm running the BP5ES plugs in my car, and when I was buying these I was advised not to get the BPR5ES plugs because the "R" in the part number stands for resistance. The resistance plugs were invented to avoid generating noise that was audible in the radio. I don't recall why that I was advised to avoid the "R" plugs, but you may want to ask around about that issue specifically and see if you get the same advice.
Click to expand...
Couldn't find the BP5ES locally so I opted for the next best alternative, the BPR6ES. Just put them in an hour ago. Will do a cold start after work today and see how we go. Will lyk.
 
boonies said:
The challenge is availability of non-resistor plugs. I bought a set on eBay last time, but the availability is going down and price is going up. If you look on the NGK site they only list resistor plugs now.

Also, I am becoming reticent about buying car parts from Amazon and eBay, too many counterfeit parts being sold on those platforms.
Click to expand...
Yes, and if you search for the BP5ES, all the google search results return BPR5ES.
 
The new copper NGK plugs made a significant difference over platinum plugs. Still not perfect bet much better than yesterday. Pretty consistent around 800 to 850 RPM. Still diesels up on shutdown but I think with an idle stop cleaning we'll be back in business. Thanks gents for the troubleshooting support. Will keep y'all posted. Prost
 
The dieseling has been there since I bought the car. Even noted on some documents I found that came with the car dating back to 2006. See attached - this is the from the 2nd owner passing the tribal knowledge down to the 3rd.
 

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Yeah Chris, I'll give that a go. Have not messed with the distributor, rotor, or cap yet.

Shouldn't I just do a proper ignition timing? I have a timing light and digital tach en route just in case I got to this point.
 
Idle seems to he squared away for the moment. Thank you all who gave their inputs, much appreciated. Seems like it was primarily a spark plug issue. Note to self...copper over platinum, iridium, etc.

@HB Chris - turned the dizzy about 1/8 inch clockwise the other day but cant say the dieseling at shutdown went away. It's still sporadic happens most timesbit not all the time.
Should I give it another 1/8 turn or go for the full kit and kaboodle timing treatment?
 
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