Do you have. 12 volt to the white/red wires going to the injectors? Bill Cardell Owner, Flyin' Miata Www.flyinmiata.com 1-800-FLY-MX5s 970-464-5600
On Jul 14, 2012, at 3:40 PM, "Eric McCord" <[email protected]> wrote: > Latest update. If I spray carb cleaner into the intake tract it runs. I also > tried ANOTHER CAS. It dies when the spray is stopped. > > Eric > > On Sat, Jul 14, 2012 at 5:00 PM, Eric McCord <[email protected]> wrote: > I have both, but the Data Link Lab expired. I used it for another issue and > then didn't purchase. I have since purchased it but have not received my key > code yet. > > RPM changes on the keypad as well as INJ. I have +12 and ground at the MAP > box with the key on. > > I have also tried it with the F/P to GND in the Diagnostic connector which > keeps the pump on and I get the same symptoms. > > I just swapped out the connector at the CAS because one of the wires looked > iffy, but no change. > > Eric > > On Fri, Jul 13, 2012 at 8:20 PM, Ray <[email protected]> wrote: > Do you have a keypad or datalogger? If so, do all of the sensor readings > look normal at key-on before cranking? Do RPM and MAP values change as > expected and do the injector pulse width & ign advance look normal during the > brief run that you do get? Do you have gnd and +12v power at the MAP box > when the key is on? > > Since the engine fires briefly but doesn’t continue to run even with the fuel > pump jumpered to stay on, I’d guess that the plugs are firing, and the > initial start is fueled by prime fuel but the ECU thinks that there is high > manifold vacuum or high coolant temp and isn’t supplying enough fuel to > continue running ... or maybe the fuel map in the ECU got hosed somehow. > The FP shutting off when the starter isn’t running says that something is > wrong with the MAP box or connections to it. Normally the ECU turns that > transistor on in the map box to keep the FP relay energized as soon as it > senses RPM > 60. > From: Eric McCord > Sent: Friday, July 13, 2012 11:39 AM > To: [email protected] > Cc: [email protected] > Subject: Re: '91 fires, won't stay on... > > Swapped out both the ignition switch and CAS. No change. I have only used the > Link. I also swapped out the fuel pump before purchasing a fuel pressure > guage. I am getting 40 psi at the rail at all times with the key on. It is > not looking like it is fuel related. > > Eric > > On Fri, Jul 13, 2012 at 2:35 PM, [email protected] <[email protected]> > wrote: > A long shot here, but it may be that the ignition switch is faulty, allowing > to to start the car and then losing electrical contact, or perhaps the > current from the ignition to the CAS has been interrupted. WAIT! You are > using the Link now, but did you EVER use another method of engine management? > Did you use an MSD? I recall long ago having a problem develop after I > upgraded from the Bell Sys II to full FM II spec with link, and it turned out > that old wiring for the MSD unit had developed a short (or some problem... > was years ago!) > > LGO > > > > -----Original Message----- > From: Eric McCord <[email protected]> > To: Mark Phillips <[email protected]> > Cc: miatapower <[email protected]> > Sent: Fri, Jul 13, 2012 11:54 am > Subject: Re: '91 fires, won't stay on... > > No luck. I just replaced that transistor and it is still doing the same thing. > > Eric > > On Fri, Jul 13, 2012 at 10:41 AM, Eric McCord <[email protected]> wrote: > I am off to the Shack. > > Eric > > > On Fri, Jul 13, 2012 at 10:39 AM, Mark Phillips <[email protected]> > wrote: > Yes. > > > On 07/13/2012 10:28 AM, Eric McCord wrote: >> on yours it was T2? Did you just replace the transistor to get it back up >> and running? >> >> Eric >> >> On Fri, Jul 13, 2012 at 10:25 AM, Mark Phillips <[email protected]> >> wrote: >> The relay has 12 volts applied to one side of the coil with the ignition on. >> When you jump F/P to GND you are taking the other side of the relay coil >> straight to ground bypassing the transistor. Normally the transistor >> performs this grounding function (sinking current). T2 also interacts with >> other circuity in the MAF box. >> >> This happened to me about 4-5 years ago on my '92. >> >> Mark >> >> >> On 07/13/2012 10:00 AM, Eric McCord wrote: >>> When I jump out the F/P to GND the pump stays on but I still have the same >>> symptoms. If that transistor drives the relay but I jump it out should that >>> not run? >>> >>> Eric >>> >>> On Fri, Jul 13, 2012 at 9:54 AM, Mark Phillips <[email protected]> >>> wrote: >>> Hi Eric, >>> >>> I sent this out earlier but didn't see it repost. I apologize if its a >>> repeat. >>> >>> There is a transistor in the Link box that replaces the AFM; it drives the >>> fuel pump relay. It is an NPN transistor, is marked "T2" and may have >>> failed. About $1.50 and a soldering iron to replace. >>> >>> Mark Phillips >>> >>> >>> On 07/13/2012 09:40 AM, Eric McCord wrote: >>>> I just swapped out the CAS and same symptoms. If it's a bad MAF box where >>>> can I get one of those? Since my Baja went down the Miata has been my only >>>> transportation and Kaitlyn and I are leaving in a week and a half for the >>>> dragon and our road trip. >>>> >>>> Eric >>>> >>>> On Fri, Jul 13, 2012 at 9:18 AM, Ray <[email protected]> wrote: >>>> Can also be that one of the two signals from the CAS is not there. >>>> >>>> From: Eric McCord >>>> Sent: Thursday, July 12, 2012 6:21 PM >>>> To: [email protected] >>>> Cc: [email protected] >>>> Subject: Re: '91 fires, won't stay on... >>>> >>>> Just checked that connector. It looked fine, I reseated it and still have >>>> the same symptoms. >>>> >>>> Eric >>>> >>>> On Thu, Jul 12, 2012 at 9:07 PM, [email protected] <[email protected]> >>>> wrote: >>>> Have you checked the manifold pressure connection (heck! I think that's >>>> what its called - I can't remember!) ? If it comes loose, it may begin >>>> to fire and then die. On mine its the small box with the AFM-like >>>> connector (multi-pin) on the driver's side. >>>> >>>> LGO >>>> >>>> >>>> _______________________________________________ >>>> Miatapower mailing list >>>> [email protected] >>>> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower >>>> >>>> >>>> _______________________________________________ >>>> Miatapower mailing list >>>> [email protected] >>>> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower >>>> >>>> >>>> >>>> _______________________________________________ >>>> Miatapower mailing list >>>> [email protected] >>>> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower >>> >>> >>> >>> _______________________________________________ >>> Miatapower mailing list >>> [email protected] >>> http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower >>> >>> >> >> >> > > > > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower > > > _______________________________________________ > Miatapower mailing list > [email protected] > http://list.miatapower.net/cgi-bin/mailman/listinfo/miatapower
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