Gaps too big on the plugs.
>From the FM install directions Remove the spark plugs and set the gap down to .034" for NAs and .028" for NBs. Hydra ECUs enable a larger gap. If the car still misfires, decrease the gap (to a minimum of .025") or replace the wires. We've had the best luck with a combination of Magnecor 8.5mm wires and NGK ZFR6F-11 plugs. Other products - wires in particular - we've seen have been much more likely to misfire. Larry White Knight 1991 Crystal White #99 CSP Silver Bullet 1992 Silverstone #17 SM2 FM I+ Turbo Honey B 1992 Sunburst Yellow #99 SM2L JR Supercharger Whooosh 2004 Titanium Mazdaspeed MX-5 LowCountry Miata http://www.lowcountrymiataclub.net Masters Miata RAGS 074 From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, March 25, 2008 1:48 PM To: Bill Cardell Cc: [email protected] Subject: RE: Fuel pressures I believe ~0.040. Need to check that. I haven't done the Spring Maintenance yet (plugs, filter, oil change, etc etc) so it is whatever I ran last fall. This is one of those "nothing changed, why is it misfiring now" problems.. So far the tally this spring is: Hunts at idle, from 800-1200 (new as of spring) Started with Misfire at 15psi (late last fall, just started it 2 weeks before I put it away), now doing it at 12psi Keypad cord is bad (unrelated??? I unplugged the keypad from it because it looked to be adjusting setting via the intermittent connection, like ign trim +5, etc. ) The only "change" is my Optima redtop died over the winter and I replaced it.. otherwise, car is identical to how it was parked. OH, and one other total oddity that has been ongoing for a while.. if I datalog the car with the laptop on battery, it works. If i plug the laptop into the Link via Serial and DD adapter in to the cig. liter, the car stalls out. Weird, eh?? (never buy a car that has been underwater!) Wallyman Inactive hide details for "Bill Cardell" <[EMAIL PROTECTED]>"Bill Cardell" <[EMAIL PROTECTED]> "Bill Cardell" <[EMAIL PROTECTED]> 03/25/2008 01:39 PM To <[EMAIL PROTECTED]>, <[email protected]> cc Subject RE: Fuel pressures Plug gap? Bill Cardell TurboDog's Dad www.flyinmiata.com www.fmwestfield.com orders 1-800-FLY-MX5S tech support 970-242-3800 Don't miss Flyin' Miata's Open House! Aug 14-17, 2008 _____ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Tuesday, March 25, 2008 10:54 AM To: [email protected] Subject: Fuel pressures Having terrible misfire at 15 psi and even now at 12psi.. I notice my fuel pressure at the rail is down 4-5psi from where it was last fall. I was getting around 58-60, now it's ~54-55... this is with the Pierberg pump from FM. What sort of fuel pressures are you folks seeing at 15psi? Is 55 ok, or should I be looking for a culprit? I'll be changing the fuel filter shortly and checking the pump for any wiring corrosion but it's just developed since sitting all winter (it has a few issues since sitting, oddly enough, this is just one of them). Wallyman
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