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8cam · 10-06-2014

A little more clarity and I think I'm homing in on it. Engine not throwing any codes at all, and vacuum holds 20" for several minutes, pump is cycling like it should. Cruise also verified working perfectly, even though that plunger still doesn't affect the idle.

So I disconnected the IAC and started pulling plug wires. When I got to #4 there was no change in the idle and it's the only one that didn't arc/spark as I pulled it. So I pulled that plug and I swear it wasn't tight. The plug looked very good, no residue, and when I reinstalled it the idle was immediately better. I actually thought I had fixed it, but a quick test drive and it's still missing badly. I ran out of daylight, but tomorrow I'll pull all the plugs and just make sure they are all seated/torqued properly. Then it looks like I have something to figure out with #4.

10-06-2014	#9
8cam Join Date: Jul 2013 Location: Atlanta Posts: 451	Re: missing/rough running A little more clarity and I think I'm homing in on it. Engine not throwing any codes at all, and vacuum holds 20" for several minutes, pump is cycling like it should. Cruise also verified working perfectly, even though that plunger still doesn't affect the idle. So I disconnected the IAC and started pulling plug wires. When I got to #4 there was no change in the idle and it's the only one that didn't arc/spark as I pulled it. So I pulled that plug and I swear it wasn't tight. The plug looked very good, no residue, and when I reinstalled it the idle was immediately better. I actually thought I had fixed it, but a quick test drive and it's still missing badly. I ran out of daylight, but tomorrow I'll pull all the plugs and just make sure they are all seated/torqued properly. Then it looks like I have something to figure out with #4. __________________ Mark '90 ZR-1 #1322 Daily Driver, 64k and counting Black/Gray [IMG]http://i208.photobucket.com/albums/bb49/mlitherland/IMG_0326_zps3d50d8cb.jpg[/IMG]