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Chevrolet Express
Platform: GMT Van

High Idle

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Old Mar 14, 2024 | 8:52 PM
  #11  
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Originally Posted by Brownie289
1992 G30, high idle, replaced the idle control valve, was running better.
Now when I drop into gear it stalls, like it’s getting no gas.
Then hard to restart.

New throttle body time?

Thanks!
check the tps sensor with a multimeter, your scan might read 0 for the tps , but the inside tracks might be worn,, voltage should be increasing while opening the tps between the ground wire and signal, if you test the sensor it should not jump volts while in a fixed position. sometimes simpler is better. . if you find the tps sensor is bad and need changing and the reeving stops after you do, but you still stall, open the tbody valve 0.1 degress, id say 0.5,, but focus on the tps sensor first. y
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Old Mar 15, 2024 | 8:49 AM
  #12  
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Thank you, I’ll double check the TPS sensor, also going to look at the gasket below the throttle body for leaks.
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Old Mar 15, 2024 | 9:00 AM
  #13  
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Originally Posted by mountainmanjoe
Code 12 indicates the computer's self-diagnostic system is functioning properly.

It does not indicate "no issues", since you will still see code 12 along with other trouble codes.
Yes I misspoke, I meant I got a code 12, that was the only code flashing.
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Old Mar 15, 2024 | 8:51 PM
  #14  
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Sounds like you have a code reader not a scan tool. There is no need for a code reader on that year because a paperclip can do the same thing. To actually read data you need a scan tool. They are few and far between these days for stuff pre-OBD2. Get yourself some electric components, a soldering iron, a serial to USB adapter, a laptop, and you can run WinALDL as a scan tool. It won't show all the sensors that are on a moden car but will show the few that it takes to run that engine.
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Old Apr 14, 2024 | 7:54 AM
  #15  
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Default Fixed..

Previous owner had put in an aftermarket temp gauge.

He pulled the temp sensor to put in the gauge.

I replaced the temp sensor idles very low and smooth now after warm up.
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Old Apr 14, 2024 | 7:59 AM
  #16  
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Temp gauge not working so will hunt that down next…
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Old May 31, 2024 | 5:03 AM
  #17  
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New temp sensor fixed the gauge
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