TPS Sensor adjustment
Thread Starter
5th Gear
Joined: Oct 2003
Posts: 5
Likes: 0
From: South Meriden Ct.
TPS Sensor adjustment
Does anyone have the specifics on how to adjust the TPS sensor on an 86.
Do I need to purchase a digital multi meter through mid america or can I buy a regular one at radio shack?
Do I need to purchase a digital multi meter through mid america or can I buy a regular one at radio shack?
Instructor
Joined: Aug 2003
Posts: 163
Likes: 0
From: Glendale Az
Re: TPS Sensor adjustment (iperez86)
I use the DVOM from Radio Shack. Have had it for 12 years and only cost $69 then. Could not afford a Fluke and now don't want to. Works fine. Adjust it to .52 volts at idle. Loosen the two torx screws and it will rotate until you reach that voltage. After you get done, open the throttle and make sure you are close to 4.8 or so volts to get full throttle. Good luck. :chevy
Melting Slicks
Joined: Apr 2002
Posts: 2,118
Likes: 0
From: St. Charles, MO Route 66 Corvette Club
Re: TPS Sensor adjustment (69vetteracer)
You can purchase an electrical connector from Mid America Direct (about $12) that allows you to easily make this adjustment. You remove the connector from the TPS. Insert one end of the MAD device into the TPS and the other end goes into the car wiring connector. There are two leads (on the MAD device) that allows you to connect an ohm meter while the car is running. My 89 TPS spec is .54 +/- .08 volts at idle. However, I set it at .65 volts and the throttle response is amazing! I use a digitial meter as it is very accurate. Hope this is helpful.
Instructor
Joined: Oct 2003
Posts: 147
Likes: 0
From: Holbrook NY
Re: TPS Sensor adjustment (vinnies87)
Sam Lam correctly says:
My 89 TPS spec is .54 +/- .08 volts at idle. However, I set it at .65 volts and the throttle response is amazing! I use a digitial meter as it is very accurate. Hope this is helpful.
I played a lot with this setting also. At about .65 - .68 volts, the idle would "hunt" sometimes. I settled on .62 - the highest allowed by the specifications. My '85 is also speced at .54 +/-.08 volts. At .54 volts throttle response was sluggish, now it is quite snappy. This is an adjustment that really makes a difference. The feel is much better, so I was quite surprised to learn that my 1/8 mile run times were not affected.
George
My 89 TPS spec is .54 +/- .08 volts at idle. However, I set it at .65 volts and the throttle response is amazing! I use a digitial meter as it is very accurate. Hope this is helpful.
I played a lot with this setting also. At about .65 - .68 volts, the idle would "hunt" sometimes. I settled on .62 - the highest allowed by the specifications. My '85 is also speced at .54 +/-.08 volts. At .54 volts throttle response was sluggish, now it is quite snappy. This is an adjustment that really makes a difference. The feel is much better, so I was quite surprised to learn that my 1/8 mile run times were not affected.
George
Le Mans Master
Joined: Feb 2000
Posts: 9,715
Likes: 27
From: Kempner Texas
Re: TPS Sensor adjustment (iperez86)
On the Forum at the top of the page there is "TOOLS" listed. Click on that and scroll down to "Tech Tips".
The adjustment procedure and lots of other good info is in there.
One point, the factory recommended procedure is you must use a digital voltmeter. The ignition "On", but engine "OFF" when making the adjustment. The 86's call for .54 volts (+/- .075); meaning any setting between .615 and .465 is within spec.
The higher end settings do seem to improve throttle response for many.
Hope this helps.
Jake
The adjustment procedure and lots of other good info is in there.
One point, the factory recommended procedure is you must use a digital voltmeter. The ignition "On", but engine "OFF" when making the adjustment. The 86's call for .54 volts (+/- .075); meaning any setting between .615 and .465 is within spec.
The higher end settings do seem to improve throttle response for many.
Hope this helps.
Jake
