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Discussion Starter · #1 ·
This 84 bluepra I picked up at auction Saturday has slight sputtering or spitting eminating from the exhaust. Engine idles very smooth until it warms up, then the spitting starts. Can definately feel the spitting holding hand over the tailpipe. Engine RPMs remain constant throughout despite spitting. Have not done compression test yet, but vacuum gauge shows a rock steady 21 in. Acceleration is smooth and strong in fact, seems to run great at any speed but idle. Starts on first crank every time, revs high, then settles back just like its supposed to. Spark plugs look OK and appear to be fairly recent bosch platinum tips. Have not yet checked resistance on plug wires but they don't seem brittle at all (says sumitomo on wires, not sure if they are original). Already swapped a new dist cap due to much corrosion on the tabs inside. Listened to each injector with stethoscope, they seem to be clicking in perfect rythm. EGR valve operates buts does not cause stumble so I suspect thats plugged so a leaky egr doesn't seem to be the problem either. Have checked all plastic and rubber intake plumbing and vacuum hoses thoroughly for vacuum leaks and don't appear to be any. Appears to have original cat - could that be partially plugged and cause this symptom? What else to check in what order?

Phil D.
 

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Discussion Starter · #4 ·
By golly, they do say 1984. Thats a useful tip. No arcing that I could see. But its a little quieter now than it was earlier in the day and as I was twisting the wires around to look for the year I could hear the telltale crinkling cellophane sound of the cores disintegrating. I've cut open a set of original wires before and indeed the conductors just turn to dust. I guess I wasn't expecting to see an original set still on the car after so many years. I do believe that whether its the problem or not, these wires have outlived their usefullness. I will try another set tomorrow off my parts car if they aren't original too and check the resistance on these.

Phil D.
 

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Discussion Starter · #7 ·
supraii said:
pdupler
Did you wash the engine before this happen?
thanks!
No and I don't think the previous owner ever washed the engine or anything else for that matter. BTW, a new set of plug wires made a great improvement in idle quality. Still needs much work as the valve stem seals leak and the EGR is plugged. Eventually will get around to everything.

Phil D.
 
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