DIY_EFI Digest Saturday, 26 October 1996 Volume 01 : Number 325 In this issue: RE: idle control valve Fuel Delivery and Ignition Question... !!!IMPORTANT!!! Computer Virus Info. Re: !!!IMPORTANT!!! Computer Virus Info. good times -- be afraid, be very afraid Re: Good Times hoax Re: Fuel Delivery and Ignition Question... Re: Computer Virus Info, oh me, oh my. Re: Fuel Delivery and Ignition Question... Re: Fuel Delivery and Ignition Question... Re: Fuel Delivery and Ignition Question... See the end of the digest for information on subscribing to the DIY_EFI or DIY_EFI-Digest mailing lists. ---------------------------------------------------------------------- From: john spears Date: Fri, 25 Oct 96 06:57 EST Subject: RE: idle control valve On most GM engines, the idle control valve, called IAC (idle air control) actually opens farther as you push on the accellerator. This is called the "throttle follower" mode. The more you push, the farther it opens. I think they do it this way so that when you let off the gas instantly, the IAC is there to "catch" it and bring it down to idle instead of the sudden transition when the throttle closes. You can watch the IAC counts on a scanner and see this going on. John Spears Speartech Fuel Injection Systems ------------------------------ From: MICROYS Robert Date: Fri, 25 Oct 96 10:33:00 EDT Subject: Fuel Delivery and Ignition Question... I hate to re-iterate, but since the first time I receive no response to this question, I'll ask it again... I own a 1995 Nissan 200SX SE-R. It has a 2.0L SR20DE engine in it with an OBD-II ECU. Nissan in its infinite wisdom has put a speed limiter in my car which shuts down my engine at an indicated 184km/hr. The vehicle has a pulse generating vehicle speed sensor, which first goes to the gauge cluster and is then passed to the ECU (I haven't gotten the 'scope on the signal to the ECU yet to find out what it sees) What I intend to do is design/create a device which sends a fixed (say 180km/hr) signal to the ECU after I exceed 180km/hr so that I may bypass this cursed functionality. I know that the ECU uses the vehicle's speed in its calculation for these functions and I am wondering what effect passing an incorrect speed of 180km/hr when I start to drive faster, say at 200+km/hr My question is: How does this effect the ignition and fuel delivery? Please help! Rob Microys rmicroys@xxx.com ------------------------------ From: brewer@xxx.com (John Brewer) Date: Fri, 25 Oct 1996 09:36:10 -0500 Subject: !!!IMPORTANT!!! Computer Virus Info. There is a computer virus that is being sent across the Internet. If you receive an email message with the subject line "Good Times", DO NOT read the message, DELETE it immediately. Some miscreant is sending email under the title "Good Times" nationwide, if you get anything like this, DON'T DOWN LOAD THE FILE! It has a virus that rewrites your hard drive, obliterating anything on it. Please be careful and forward this mail to anyone you care about. The FCC released a warning last Wednesday concerning a matter of major importance to any regular user of the Internet. Apparently a new computer virus has been engineered by a user of AMERICA ON LINE that is unparalleled in its destructive capability. Other more well-known viruses such as "Stoned", "Airwolf" and "Michaelangelo" pale in comparison to the prospects of this newest creation by a warped mentality. What makes this virus so terrifying, said the FCC, is the fact that no program needs to be exchanged for a new computer to be infected. It can be spread through the existing email systems of the Internet. Once a Computer is infected, one of several things can happen. If the computer contains a hard drive, that will most likely be destroyed. If the program is not stopped, the computer's processor will be placed in an nth-complexity infinite binary loop - which can severely damage the processor if left running that way too long. Unfortunately, most novice computer users will not realize what is happening until it is far too late. Luckily, there is one sure means of detecting what is now known as the "Good Times" virus. It always travels to new computers the same way in a text email message with the subject line reading "Good Times". Avoiding infection is easy once the file has been received simply by NOT READING IT! The act of loading the file into the mail server's ASCII buffer causes the "Good Times" mainline program to initialize and execute. The program is highly intelligent - it will send copies of itself to everyone whose email address is contained in a receive-mail file or a sent-mail file, if it can find one. It will then proceed to trash the computer it is running on. The bottom line is: - if you receive a file with the subject line "Good Times", delete it immediately! Do not read it. Rest assured that whoever's name was on the "From" line was surely struck by the virus. Warn your friends and local system users of this newest threat to the Internet! It could save them a lot of time and money." POC: Denise Fisher NAVICP Mechanicsburg Information Systems Security Manager Code M08911 extension 6949 "Any man who would trade liberty for security deserves neither." - Ben Franklin ------------------------------ From: Paul Beam Date: Fri, 25 Oct 1996 11:25:55 -0400 Subject: Re: !!!IMPORTANT!!! Computer Virus Info. At 09:36 AM 10/25/96 -0500, you wrote: >There is a computer virus that is being sent across the Internet. If >you receive an email message with the subject line "Good Times", DO >NOT read the message, DELETE it immediately. Not again! This is a big hoax. Tell all your friends this is a hoax. R Paul Beam Computer Systems Engineer Johnson Bible College 7900 Johnson Drive Knoxville, TN 37998 (423) 573-4517 (423) 579-2337 fax ------------------------------ From: SRavet@xxx.com Date: Fri, 25 Oct 96 10:49:42 CDT Subject: good times -- be afraid, be very afraid | There is a computer virus that is being sent across the Internet. Viruses? On the Internet? NO! | Apparently a new | computer virus has been engineered by a user of AMERICA ON LINE BWAAAHAHAHAHA! An AOL user. yeah right. | If the program is not stopped, the computer's processor will be placed | in an nth-complexity infinite binary loop Fascinating! | The bottom line is: - if you receive a file with the subject line | "Good Times", delete it immediately! The real bottom line is that if you receive an email about the good times virus, then the person who sent it was fooled by an ancient (in internet time) hoax. No harm done, but don't send it to anyone else. :-) - --steve Steve Ravet sravet@xxx.com Baby you're a genius when it comes to cooking up some chili sauce... ------------------------------ From: Doug Rorem Date: Fri, 25 Oct 1996 10:56:49 -0500 Subject: Re: Good Times hoax The Good Times virus is a hoax. It has been circulating since December 1994. References: http://www.hr.doe.gov/goodtime.html ftp://usit.net/pub/lesjones/good-times-virus-hoax-faq.txt - -- Doug Rorem University of Illinois at Chicago (312)-996-5439 [voice] EECS Department RM 1120 (312)-413-1065 [fax] 851 S. Morgan Street (708)-996-2226 [pager] Chicago, IL 60607-7053 rorem@xxx.edu ------------------------------ From: atsakiri@xxx.com Date: Fri, 25 Oct 96 12:44:56 -0400 Subject: Re: Fuel Delivery and Ignition Question... > What I intend to do is design/create a device which sends a fixed (say > 180km/hr) signal to the ECU after I exceed 180km/hr so that I may bypass > this cursed functionality. I know that the ECU uses the vehicle's speed in > its calculation for these functions and I am wondering what effect passing > an incorrect speed of 180km/hr when I start to drive faster, say at > 200+km/hr My question is: How does this effect the ignition and fuel > delivery? Please help! Sorry, can't provide any specific help, but I wanted to say that that rev limiter must be there for a reason. I'd expect vehicle speed to impact transmission control more than anything else. Suggestion: consider everything that spins (e.g. engine, transmission, driveline, tires, etc) and step carefully. Anthony Tsakiris - --------------------------------------------------------------------------- The opinions expressed are my own and not necessarily those of my employer. ------------------------------ From: Corey Stup Date: Fri, 25 Oct 1996 13:38:32 -0400 Subject: Re: Computer Virus Info, oh me, oh my. John Brewer wrote: > > There is a computer virus that is being sent across the Internet. If > you receive an email message with the subject line "Good Times", DO > NOT read the message, DELETE it immediately. Not this again.... Hoax, hoax, hoax. ------------------------------ From: Markus Strobl Date: Fri, 25 Oct 1996 13:22:08 -0500 (CDT) Subject: Re: Fuel Delivery and Ignition Question... > > What I intend to do is design/create a device which sends a fixed (say > > 180km/hr) signal to the ECU after I exceed 180km/hr so that I may bypass > > this cursed functionality. I know that the ECU uses the vehicle's speed in > > its calculation for these functions and I am wondering what effect passing > > an incorrect speed of 180km/hr when I start to drive faster, say at > > 200+km/hr My question is: How does this effect the ignition and fuel > > delivery? Please help! > > Sorry, can't provide any specific help, but I wanted to say that > that rev limiter must be there for a reason. I'd expect vehicle > speed to impact transmission control more than anything else. > > Suggestion: consider everything that spins (e.g. engine, > transmission, driveline, tires, etc) and step carefully. > > > Anthony Tsakiris I don't know about a nissan, but the camaros have the same speedlimiter if you order the car with the default tires. These tires are H-rated, and they put in a 108mph speedlimiter for liability reasons. If the car is ordered with the optional Z-rated tires there's no speedlimiter. for the Camaro hypertech makes a flash-memory programmer that can remove the limiter (among other things). Don't know if they make one for a nissan. Check out their web page at www.hypertech-inc.com - ------- Markus '96 Z28 ------------------------------ From: peter paul fenske Date: Fri, 25 Oct 1996 15:48:23 -0700 Subject: Re: Fuel Delivery and Ignition Question... At 01:22 PM 10/25/96 -0500, you wrote: >> > What I intend to do is design/create a device which sends a fixed (say >> > 180km/hr) signal to the ECU after I exceed 180km/hr so that I may bypass >> > this cursed functionality. I know that the ECU uses the vehicle's speed in >> > its calculation for these functions and I am wondering what effect passing >> > an incorrect speed of 180km/hr when I start to drive faster, say at >> > 200+km/hr My question is: How does this effect the ignition and fuel >> > delivery? Please help! Hi All For GM VSS or speed sets up various self tests but these generally happen at 50 MPH and are not that critical. For an automatic lockup control happens at about 35 MPH or so. Ditto for fan control. So altering the top speed will not affect the ecm correctly. I do believe some of the nissans have active control systems in there suspension and steering but the results are generally subjective. Remember though ABS also works from this but is usually enabled above 40MPH. The neatest way to get around this problem is to build a ratio adapter. Say 10 pulses in six out. This would convert the KMph to MPH. With the old cable speedos we used to buy gear adapter. Later: peter ------------------------------ From: "Chuck Tomlinson" Date: Sat, 26 Oct 1996 04:19:12 -0400 Subject: Re: Fuel Delivery and Ignition Question... > From: peter paul fenske > > For GM VSS or speed sets up various self tests but these generally > happen at 50 MPH and are not that critical. For an automatic lockup > control happens at about 35 MPH or so. Ditto for fan control. > So altering the top speed will not affect the ecm correctly. > > I do believe some of the nissans have active control systems in there > suspension and steering but the results are generally subjective. > > Remember though ABS also works from this but is usually enabled > above 40MPH. AFAIK, passenger car ABS uses only the wheel speed sensors. The resolution of VSS is not useful for wheel speed control (at least on GM vehicles). Otherwise I agree with you. I don't see why the ECM would care whether engine speed corresponds with vehicle speed at high speeds. Sudden changes in VSS may trigger diagnostic faults, but a high limit on VSS should be OK. - -- Chuck Tomlinson ------------------------------ End of DIY_EFI Digest V1 #325 ***************************** To subscribe to DIY_EFI-Digest, send the command: subscribe diy_efi-digest in the body of a message to "Majordomo@xxx. 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