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cold start; geo wont start when cold
Topic Started: Feb 27 2009, 09:09 PM (4,162 Views)
freegeo
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Lets first verify what type of emissions you have? Upgraded or standard?

Does you throttle body look like the one in the picture (black component attached to the back of the throttle body. ISC)? If so the you have upgraded emissions. How you set the TPS will depend on which you have.

Posted Imageupgraded emissions
Edited by freegeo, Aug 9 2017, 11:44 PM.
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Bank2me
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freegeo
Aug 9 2017, 10:11 PM
Let me check the procedure. I think you should be checking for voltage not resistance
Ok sounds good I appreciate it freegeo
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Bank2me
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freegeo
Aug 9 2017, 11:43 PM
Lets first verify what type of emissions you have? Upgraded or standard?

Does you throttle body look like the one in the picture (black component attached to the back of the throttle body. ISC)? If so the you have upgraded emissions. How you set the TPS will depend on which you have.

Posted Imageupgraded emissions
Hmm let me snap a pic/take a look after work today. I don't believe mine has that on the back but will verify today. I appreciate the help!!
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Bank2me
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So mine looks like it has that ISC on it. I tried uploading a pic but it won't let me upload it in here.
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freegeo
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If it has the black plastic piece attached to the back of your throttle body then you have upgraded emission.

Use the upgraded emission check and adjust procedure. Check is on page 14 - adjust is on page 15 in the 6E2-C COMPONENTS

http://geometroforum.com/topic/5044844/1/#new
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Bank2me
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freegeo
Aug 10 2017, 12:56 PM
If it has the black plastic piece attached to the back of your throttle body then you have upgraded emission.

Use the upgraded emission check and adjust procedure. Check is on page 14 - adjust is on page 15 in the 6E2-C COMPONENTS

http://geometroforum.com/topic/5044844/1/#new
Ok I will test it that way but they are talking about plugging in a "data link connector". What exactly do they mean by that?
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MR1 Kingsbury
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Exp. builder/rebuilder

The check and adjustment details for UPGRADED emissions starts on page 6E2-C1-13. In lieu of a tech one scantool you can insert little bitty paperclips into the TPS connector on pins 1 and 3 . It is a 4 connector terminal but number 2 is blanked. Read voltage with multimeter set to 0-2volts.
shove the paperclips into the connector while the ignition is off and tps still plugged in. Called backprobing, this allows the multimeter to read same voltage that is sent to pcm or ecm for early models.
Edited by MR1 Kingsbury, Aug 10 2017, 06:53 PM.
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suzukitom
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Tom

Quote:
 
Ok I will test it that way but they are talking about plugging in a "data link connector". What exactly do they mean by that?


Prior to carmakers use of standardized OBD 2 connectors beginning in 1996+, GM used a proprietary connector requiring use of their own scan tool.
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Bank2me
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MR1 Kingsbury
Aug 10 2017, 06:50 PM
The check and adjustment details for UPGRADED emissions starts on page 6E2-C1-13. In lieu of a tech one scantool you can insert little bitty paperclips into the TPS connector on pins 1 and 3 . It is a 4 connector terminal but number 2 is blanked. Read voltage with multimeter set to 0-2volts.
shove the paperclips into the connector while the ignition is off and tps still plugged in. Called backprobing, this allows the multimeter to read same voltage that is sent to pcm or ecm for early models.
So you are saying stick a paper clip in there, then which probe from the multimeter do I stick on which part?
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suzukitom
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Tom

Bank2me
Aug 10 2017, 08:50 PM
MR1 Kingsbury
Aug 10 2017, 06:50 PM
The check and adjustment details for UPGRADED emissions starts on page 6E2-C1-13. In lieu of a tech one scantool you can insert little bitty paperclips into the TPS connector on pins 1 and 3 . It is a 4 connector terminal but number 2 is blanked. Read voltage with multimeter set to 0-2volts.
shove the paperclips into the connector while the ignition is off and tps still plugged in. Called backprobing, this allows the multimeter to read same voltage that is sent to pcm or ecm for early models.
So you are saying stick a paper clip in there, then which probe from the multimeter do I stick on which part?
Here is a picture of the TPS connector and the 3 wires (#2 in connector is not used)

Posted Image

I highlighted the numbers in red so you can see them better. Insert paper clips (or T pins) into connector holes 1 and 3. (the paper clip or T pin will when inserted, wiggle the rubber boot aside a bit so that the metal will make contact with the wire conductor)

The multimeter probes will be either 1 or 3. If your digital multimeter is auto-reversing, it will show the DC voltage as either - or + . It doesn't matter which probe goes into #1 or #3 unless you are using an old style analog movement meter. The needle would move backward if you did not hook it up properly.
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Attachments: TPS_1234.jpg (183.9 KB)
Edited by suzukitom, Aug 10 2017, 09:14 PM.
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Bank2me
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suzukitom
Aug 10 2017, 09:12 PM
Bank2me
Aug 10 2017, 08:50 PM
MR1 Kingsbury
Aug 10 2017, 06:50 PM
The check and adjustment details for UPGRADED emissions starts on page 6E2-C1-13. In lieu of a tech one scantool you can insert little bitty paperclips into the TPS connector on pins 1 and 3 . It is a 4 connector terminal but number 2 is blanked. Read voltage with multimeter set to 0-2volts.
shove the paperclips into the connector while the ignition is off and tps still plugged in. Called backprobing, this allows the multimeter to read same voltage that is sent to pcm or ecm for early models.
So you are saying stick a paper clip in there, then which probe from the multimeter do I stick on which part?
Here is a picture of the TPS connector and the 3 wires (#2 in connector is not used)

Posted Image

I highlighted the numbers in red so you can see them better. Insert paper clips (or T pins) into connector holes 1 and 3. (the paper clip or T pin will when inserted, wiggle the rubber boot aside a bit so that the metal will make contact with the wire conductor)

The multimeter probes will be either 1 or 3. If your digital multimeter is auto-reversing, it will show the DC voltage as either - or + . It doesn't matter which probe goes into #1 or #3 unless you are using an old style analog movement meter. The needle would move backward if you did not hook it up properly.
Thanks Suzukitom!! What should the voltage be? And should I have the key off while testing or on?
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suzukitom
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Tom

With the ignition switched to ON (but engine not running!) the voltage at these terminals would be between 0.98 to 1.02 Volts with the feeler gauge inserted between the idle stop screw tip and the (rotating) throttle lever (circled in top photo)

If the engine is cold, the idle speed motor plunger may be extended, causing the throttle to open more, and increasing the voltage reading. That`s why the TPS check is usually done after the engine has been warmed up, but not running of course.

Posted Image

The feeler gauges used should add up to 0.14 inches thick. Some folks use a 9/64" Allen wrench instead of a feeler gauge, which is also 0.140" across the flats (3.5 mm for you metric system users)
Edited by suzukitom, Aug 10 2017, 09:52 PM.
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Bank2me
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Thanks Suzukitom!! I will try it in the morning tommorow and see what happens and report back.
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Bank2me
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Ok guys so I did the test ignition on with a .014 feeler gauge in there and only could get a reading up to .87 volts. But the engine was not warm. Should I run the engine before the test or is it still accurate the way I'm doing it?
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David95237


wrong feeler gauge. .14 not.014
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