Engine Miss Help

JTO · 11-03-2003, 07:17 AM

Hi Gang,

I did the diagnostics that a few of you suggested but the car continues to missfire. The miss seems to be coming from the passenger side of the engine. If I remove the plug wires systematically, only the driver's side wire removal appears to affect the idle quality. I have checked the passenger side wires for resistance and they all measured 6 OHMs. I changed the spark plugs to known good ones, and still the engine idles roughly and misses. The number five plug was wet when I pulled it, but then found number four wet later. If I rev the engine it smooths out past about half throttle but as soon as movement of the throttle stops, the engine begins to miss again. I am not saying that it runs normally as throttle opens, just better. The engine was running fine Thursday night when I parked it in the garage. Friday morning, all of this began.

I checked the injectors for flow and all seemed normal. I have put two bottles of Techron in the tank and run it on hwy to remove deposits. No improvement.

Any ideas? Thanks,
Troy

JTO · 11-03-2003, 08:32 AM

i know there is the expertise out there to help me with this! I have to get it back on the road!

Thanks,
Troy

Otto · 11-03-2003, 03:38 PM

Change the intake manifold gaskets, and probably the intake boots.

JTO · 11-03-2003, 03:42 PM

Thanks Otto,
The motor is completely rebuilt last summer. The engine ran great one day and literally ran terrible the next morning, "missing". I replaced a bad injector o-ring but the car continues to miss. The carb cleaner test revealed no vacuum leaks.

Troy

Early_S_Man · 11-03-2003, 04:02 PM

JTO,

You mean 6K, or 6000 Ohms, right?

Are the ignition wires factory, or aftermarket?

Are you saying only removing spark plug wires 1 - 3 ... has any effect on idle?

ubiquity0 · 11-03-2003, 04:45 PM

I've been wondering what is a good baseline for replacing OEM ignition wires? My SC wires do arc a little in places & I mean only slightly. I've read threads of people describing a light show at night- mine is noticeable if I look carefully but not spectacular. Does this mean they should be replaced?
thanks

JTO · 11-04-2003, 07:02 AM

Warren,
It appears that the driver's side of the engine is getting good spark based on the fact that when I pulled the plug wires from this side, systematically, the engine idle dropped and the engine nearly died. When I did this test on the passenger's side, the rough idle did not change. In other words, it appears that the passenger side is getting intermitant spark. I also felt that the arc from the spark plug connector was weak and I could only get one or two arcs to jump to ground. On the driver's side, the spark would jump an inch.

Thanks,
Troy