DIY_EFI Digest Sunday, August 8 1999 Volume 04 : Number 457 In this issue: ALDL Connectors Help -- Need Ford Mass Air Flow Meter Re: Propane and ecms: Halp MAP sensor vent See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- Date: Sun, 8 Aug 1999 08:58:05 -0500 From: nacelp@xxx.com (CSH-HQ) Subject: ALDL Connectors Been posted in the DIY archives. Both 12+16. Try OBD for the 16 in search Bruce Date: Sat, 7 Aug 1999 19:58:45 EDT >From: Mikepoore@xxx.com >Subject: Looking for ALDL connectors > >Does anyone know where I can find 12 pin and 16 pin GM ALDL connectors? I am >looking for the male ends. I've got my interface working, but I would like to >connect and disconnect it a little easier than pin by pin. > >Mike Poore > ------------------------------ Date: Sat, 7 Aug 1999 14:50:47 -0700 From: "Wallace A. Gustafson" Subject: Help -- Need Ford Mass Air Flow Meter This is a multi-part message in MIME format. - ------=_NextPart_000_0029_01BEE0E4.3C286C40 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Does anyone have a spare "Stock 5.0" or "70mm Cobra" Mass Air Flow = Sensor? Need to obtain one with minimal costs involved. Please reply off list. Thank You, Wallace "Cobra" Gustafson Sorry about the cross list postings. - ------=_NextPart_000_0029_01BEE0E4.3C286C40 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

Does anyone have a spare "Stock 5.0" or = "70mm=20 Cobra" Mass Air Flow Sensor?

Need to obtain one with minimal costs=20 involved.

Please reply off list.

Thank You,

Wallace "Cobra" Gustafson

Sorry about the cross list = postings.

- ------=_NextPart_000_0029_01BEE0E4.3C286C40-- ------------------------------ Date: Sun, 8 Aug 1999 10:24:03 -0700 From: "Peter Fenske" Subject: Re: Propane and ecms: Halp Howday All I was wondering if anyone is familiar with or has any documentation on a GM Integrated Processor Fuel Management system made by Autotronics Control Corp Part # 5920. It is giving me a problem in a commercial Van application. The unit appears to control a propane mixer using closed ?? loop operation..Quite a integrated mixer. Mind you the solenoid doing the controlling looks cheaper than the stock egr sol. It plugs in a 350 tbi using a 8747 C3 ecm. Definitely found out you cannot use the 8747 cal in a 7747. Boy does SES lite blink. Now the problem. The Autotronics unit plugs into the TPS and Map sensor. The original ecm connectors plug into the autronics unit I would presume the signals are processed and then sent to the ecm.. Big SES lite is on. Scan shows the TPS and Map signal are NOT going to the ecm. No timing, TCC ect.. So I was gonna use an extra map and plug the stock ecm into that. Not sure bout TPS.. Wonder if the signal output can be run in parallel.. At least the ecm would be happy. Thank you for any help anyone can give :peter ------------------------------ Date: Mon, 09 Aug 1999 04:40:47 +1000 From: Phil Lamovie Subject: MAP sensor vent Hi All, John wrote; > MAP sensor vent for the Honda engine is located about 5 mm behind the > throttle plate. Once the throttle is opened wide my MAP goes to > atmospheric. Sounds like you found a convenient place to stick a vacuum hose but given the shading of the port at part throttle very unlikely to be a "true" reflection of load. Try moving the hose to the plenum. All throttle excursions need to be treated with respect. More than X translation in an increasing load direction should cause the ecu to default from closed loop to open. At this point the fueling should be 95% correct as it was established by steady state testing and calibrating. It seems that your system may be "hanging on" to the closed loop algorithm a little too long. Instead of a base operating condition of closed loop try setting the base fueling to the max power table and then apply time/throttle deg/rate of change of rpm conditions before electing closed loop. Just as you worried about the TECHONOGICAL miracle of valve timing vs injection timing you are trying too hard to keep closed loop operation as the basis of engine fueling. Plain old dumb mapping is very efficient. 8 bit rpm X 8 bit load = 65,000 carby jets By this I'm refering to a 4 point map with interpolation using an 8 bit A/D converter. There must be a value for every load / rpm possible not just WOT. The accel enrichment is used to mask the lean out caused by system lag (your code plays a part here) If you can successfully calculate a new open loop injection value every rpm then accel enrichment is used for less than 0.5 of a second, any longer and it's just more smoke. re bailing wire see page 194 "Stainless-steel spring wire DIN no. 17 224 Alloying constituents in % by weight <0.12 C; 17 Cr; 7.5 Ni; E=185,000 G=73,000 For 1mm diam N/mm2 min. = 2000 Z=reduction of area at fracture 40 % Permissable bending stress =1400 N/mm Permissable lift stress cycles endured =380 x 10 to the 7th etc etc etc add 40% for shot peening (see page 286/287) I kid you not ! Regards Phil Lamovie injec@xxx.au cogito ergo zoom ------------------------------ End of DIY_EFI Digest V4 #457 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. A non-digest (direct mail) version of this list is also available; to subscribe to that instead, replace "diy_efi-digest" in the command above with "diy_efi".