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 <[email protected]> >> *Sent:* Friday, July 13, 2012 11:39 AM >> *To:* [email protected] <[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 <[email protected]> >>>>>>>> *Sent:* Thursday, July 12, 2012 6:21 PM >>>>>>>> *To:* [email protected] <[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 >>>>>>> [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 >>> [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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