Cold Start Rough Idle

916MKIIIx2 · 05-23-2011, 12:07 AM

So, my 7mgte just randomly started to cold start rough and after warming almost seems to miss fire every once in a great while, though after it warms up the roughness go away. I checked the ISCV and it was pretty clogged so I cleaned that out and it did not improve the rough idle, I did a compression test and it came out good, also did a chemical leak down test which came back negative. So I ruled out a bad head gasket and clogged ISCV, I also checked as best I could for vacuum and intake leaks, I found none that were visible. So what I'm hoping for is basically just some ideas.

Oh yeah pulled the plugs and they looked in good condition and the wires only have 20k on em.

05-23-2011, 12:07 AM	#1
916MKIIIx2 3" Exhaust Join Date: Nov 2008 Location: California Posts: 152	Cold Start Rough Idle So, my 7mgte just randomly started to cold start rough and after warming almost seems to miss fire every once in a great while, though after it warms up the roughness go away. I checked the ISCV and it was pretty clogged so I cleaned that out and it did not improve the rough idle, I did a compression test and it came out good, also did a chemical leak down test which came back negative. So I ruled out a bad head gasket and clogged ISCV, I also checked as best I could for vacuum and intake leaks, I found none that were visible. So what I'm hoping for is basically just some ideas. Oh yeah pulled the plugs and they looked in good condition and the wires only have 20k on em.