Would that stop spark? Ken
On Thu, Apr 22, 2010 at 1:38 PM, Larry Alster <[email protected]> wrote: > The 90-93 have a AFM and it does stop the FP from running if it is no > good or if the connection is no good. It really isn’t looking for the > engine turning, it’s looking for airflow through the meter. > > > > > > > > > > Larry Alster > > > > 91 Miata White Knight > > 92 Miata Silver Bullet > > 92 Miata Honey B > > 04 MSM MX-5 Whooosh > > 06 WRX STi Subie > > > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Ken Bogart > *Sent:* Thursday, April 22, 2010 11:56 AM > *To:* Mark Phillips > > *Cc:* MiataPower > *Subject:* Re: no start 1990.. > > > > When you first turn the ignition on, the fuel pump runs for 10 seconds or > so to pressurize the system. I think it then shuts off until it sees the > engine turning. > > > > > > Ken > > On Thu, Apr 22, 2010 at 11:40 AM, Mark Phillips < > [email protected]> wrote: > > Hi Stephen, > > > > The airflow sensor on a ’90 will prevent the fuel pump from running. There > is a switch inside that opens when the flapper door is closed (fuel shut > off). You might also check the fuel pump relay/replace under the dash that > is operated by the air flow switch. It has a yellow connector IIRC. This is > a timed circuit on start-up and may allow the car to fire but not run. > > > > Mark > > > ------------------------------ > > *From:* [email protected] [mailto: > [email protected]] *On Behalf Of *Stephen Rigley > *Sent:* Thursday, April 22, 2010 10:55 AM > *To:* Ken Bogart > *Cc:* MiataPower > *Subject:* Re: no start 1990.. > > > > Thanks Ken! > > On Thu, Apr 22, 2010 at 3:53 PM, Ken Bogart <[email protected]> wrote: > > My random thoughts.... > > > > Sounds like a broken timing belt except that you say the cams are turning. > > > > A failed MAF won't stop spark and fuel. > > > > If CAS is rotating, you should see spark and fuel. If CAS is bad, no spark, > no fuel. > > > > Just because the plugs are "dry" does not mean you are not getting fuel. > Can you smell fuel at the exhaust? Check to see if injectors are firing. Use > a stethoscope on the injectors (rod to the ear). you should hear them > clicking when cranking. > > > > The only explanations for both no spark and no fuel is timing belt, CAS or > ECU. > > > > I would verify that the injectors are NOT firing. If they are not and the > CAS is rotating, it has to be related to bad CAS/wiring or ECU. > > > > Good luck! > > > > > Ken Bogart > ----------------------------------------------------- > 96 Montego Blue FFS Coldside (His) > 97 Black & Tan (Hers) > 90 Crystal White (sons) > ------------------------------------------------------ > http://www.miatacare.com > http://www.cincimiata.com > http://www.miatagathering.com > http://www.bcchallenger.org > MiataMail.com list owner > > On Thu, Apr 22, 2010 at 10:39 AM, Stephen Rigley <[email protected]> > wrote: > > Hi, > > Having a problem starting getting a stock '90 started, it died a few weeks > ago, replaced coil, nothing.. no spark, unplugged and replugged in ECU, it > started (!?). > A day later, it died in traffic.. > no spark, > no fuel (plugs are dry), > fuel pump runs w/key on crank, > power at coil, > power in and out of ECU, > have tried a good ECU (at least it was good when I took it out.. ) from a > '91, > tried the CAS from my car, > cams are turning, > wiggled wires near rear of intake manifold, > wiggled key in ignition, > tried another coil.. still nothing.. > > Might see if we can source/try a different MAF, although if thats bad it > stops fuel pump from running.. true? > > Fuses + relays checked (need to double check EFI fuse and relay to be sure > though) > > Anything else we've forgotten? > Thanks > Steve > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > > > > > >
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