[MR2] (no subject)

[Donald Chalfant]

They do fail, and the car will not start or run. Usually the intermittent cutting out and recalibration was the sign (on mine) that it was time to start looking for another TPS. 


----- Original Message ----- 
  From: Dennis McFayden 
  To: telek2 at frontier.com 
  Cc: MR2 Email 
  Sent: Monday, February 06, 2012 11:36 PM
  Subject: [MR2] (no subject)


  Kurt,

  The two connections you must measure are VTA to E2. This resistance value will vary from the low value, 0.2k to 0.8k, up to the highest value of 10K with the throttle wide open. 

  Since there is only one adjustment you first must start with the throttle closed and the lowest resistance value. You can then check the other resistances with the feeler gage in place. 

  From past experience the TPS is a very critical item for adjustment. The only difference between the NA and the SC is the feeler gage setting for the equivalent resistances. 

  Dennis

  Date: Sun, 05 Feb 2012 12:06:54 -0800
  From: Kurt Krueger <telek2 at frontier.com>
  To: MR2 Email <mr2 at mr2.com>
  Subject: Re: [MR2] MK1 SC Idling and starting problem
  Message-ID: <4F2EE15E.8030806 at frontier.com>
  Content-Type: text/plain; charset=ISO-8859-1; format=flowed

  On 2/4/2012 7:26 PM, Dennis McFayden wrote:
  > My daughter drives a '89 SC. She reported that the car was idling in a strange way. When she came to a stop the car would first idle at the normal speed and then the speed would slowly drop. The next problem that appeared was one night after she had stoped the car after a long drive she couldn't get the car to start. She pumped the accelerator several times and finally was able to get the car going.
  > 
  > When we decided to work on the car my first thought was a fuel pressure problem. I checked the fuel pressure and found that the pressure was good. In fact the pressure was on the high side of the limit for both settings of the pressure regulator.
  > 
  > I then remembered one thing on the MK1 that really messed up my idling for my '87. That was the Throttle Position Sensor. We checked the resistance setting on the '89 SC. The idle resistance was suppose to be between 0.2 to 0.8 Kohms. The resistance was more than 2 Kohms. We adjusted the resistance so it was about 0.7K, 700 ohms.
  Interesting. The '88 BGB has the same specs, but is shows the IDL-E2 
  connection as a switch. So I'd expect the resistance at idle to be 
  zero. I'm having similar problems with my '88 SC but never bothered to 
  check the TPS after I learned that it had an idle contact. I'll 
  certainly check it out next time I fire it up (it's on the injured 
  reserve list, time for a timing belt).

  My GM truck doesn't have an idle contact, the ECU has to learn the idle 
  resistance (which it does a poor job).
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