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fletchusmc · 12-26-2014

Been enjoying my ZR-1 and driving as often as I can, but now having some running issues.

1995, stock with Corsa catback, Screamin Demon coils, and Livewires spark plug wires. 68,xxx miles.

Drove it to work Friday morning, seemed fine. About a 50 mile commute one way. Left work to come home and started running a little rough, loss of power, no difference with power key on or off. Felt like maybe some bad gas. Drove it a lot over the weekend to burn off some fuel. Put in a can of Seafoam and filled up with fresh gas. Drove it to work Monday and same thing. Tuesday morning was the same thing but coming home Tuesday it got worse. Didn't want to hardly rev. Idle so bad at stop light that dual mass was making noises.

Pulled plugs, all looked the same and replaced about 8,000 miles ago.
Checked ohms through wires and coils:
1-6 9.03k
2-3 9.3k
4-7 9.07k
5-8 9.00k

Didn't drive it the rest of the week. Saturday took it out a bit and not as bad, felt like something "freed up" a bit like it could breath easier. Rev'd easier, idle not as bad, still not perfect and still low on power. Got on it and got a exhaust smell, took a lot longer to get up in RPM's but it would.

Decided to go ahead and pull the converters to check them out as it seemed like an easy thing to do. After being under there maybe not so much. Looks like possibly 3 bolts won't be so bad but one doesn't seem to have any room at all.

So, does it sound like I'm on the right track or should I be focusing elsewhere? Can't see any messed up vacuum lines, don't hear any vacuum leaks. MAP and fuel pressure regulator lines are good. Went ahead and replaced fuel filter as well and no change.

12-26-2014	#1
fletchusmc Join Date: Nov 2013 Location: Jacksonville, NC Posts: 48	Catalytic converters? Been enjoying my ZR-1 and driving as often as I can, but now having some running issues. 1995, stock with Corsa catback, Screamin Demon coils, and Livewires spark plug wires. 68,xxx miles. Drove it to work Friday morning, seemed fine. About a 50 mile commute one way. Left work to come home and started running a little rough, loss of power, no difference with power key on or off. Felt like maybe some bad gas. Drove it a lot over the weekend to burn off some fuel. Put in a can of Seafoam and filled up with fresh gas. Drove it to work Monday and same thing. Tuesday morning was the same thing but coming home Tuesday it got worse. Didn't want to hardly rev. Idle so bad at stop light that dual mass was making noises. Pulled plugs, all looked the same and replaced about 8,000 miles ago. Checked ohms through wires and coils: 1-6 9.03k 2-3 9.3k 4-7 9.07k 5-8 9.00k Didn't drive it the rest of the week. Saturday took it out a bit and not as bad, felt like something "freed up" a bit like it could breath easier. Rev'd easier, idle not as bad, still not perfect and still low on power. Got on it and got a exhaust smell, took a lot longer to get up in RPM's but it would. Decided to go ahead and pull the converters to check them out as it seemed like an easy thing to do. After being under there maybe not so much. Looks like possibly 3 bolts won't be so bad but one doesn't seem to have any room at all. So, does it sound like I'm on the right track or should I be focusing elsewhere? Can't see any messed up vacuum lines, don't hear any vacuum leaks. MAP and fuel pressure regulator lines are good. Went ahead and replaced fuel filter as well and no change.