Problem o' the day... - ZR-1 Net Registry Forums

KILLSHOTS · 08-11-2014

UPDATE: This afternoon, I went through and rechecked every vacuum connection that I could touch, including the entire PCV assembly and MAP. Everything fine there. I wanted to make sure that my plug wires weren't causing the stumble, so I removed them all and put a small dab of DE in each one and ensured they were tight. (Marc said it's HIGHLY unlikely that the plugs are actually fouling.) Also unhooked the battery and removed and reseated the PROM that I had just installed.

Fired it up, it raced to 2000 again and hung there for about 2 minutes. Finally dropped off and sounded like it was just about to stall, when it jumped to 1200, then dropped to 900, then 1200, then 900, over and over again. Went for a drive of probably 2 miles, and the light-throttle stumble was DEFINITELY still there. Hammered it hard a few times and brought it up to temp. Pulled back in the garage and it was idling perfectly smoothly at 700ish. Shut it down for a few minutes and restarted and everything was fine. Went for another quick ride and no stumble. I hope this gremlin is gone for good but they sure are frustrating when they're completely random, here one moment and gone the next. I'd feel better if it hadn't reappeared after I made those few little adjustments, only to then disappear for no apparent reason.

08-11-2014	#10
KILLSHOTS Join Date: Feb 2014 Location: AZ Posts: 860	Re: Problem o' the day... UPDATE: This afternoon, I went through and rechecked every vacuum connection that I could touch, including the entire PCV assembly and MAP. Everything fine there. I wanted to make sure that my plug wires weren't causing the stumble, so I removed them all and put a small dab of DE in each one and ensured they were tight. (Marc said it's HIGHLY unlikely that the plugs are actually fouling.) Also unhooked the battery and removed and reseated the PROM that I had just installed. Fired it up, it raced to 2000 again and hung there for about 2 minutes. Finally dropped off and sounded like it was just about to stall, when it jumped to 1200, then dropped to 900, then 1200, then 900, over and over again. Went for a drive of probably 2 miles, and the light-throttle stumble was DEFINITELY still there. Hammered it hard a few times and brought it up to temp. Pulled back in the garage and it was idling perfectly smoothly at 700ish. Shut it down for a few minutes and restarted and everything was fine. Went for another quick ride and no stumble. I hope this gremlin is gone for good but they sure are frustrating when they're completely random, here one moment and gone the next. I'd feel better if it hadn't reappeared after I made those few little adjustments, only to then disappear for no apparent reason.