Alright I have a 1990 Honda Accord. The ECM flashed me a TPS. To Replace it I had to take the throttlebody off. I scraped the old throttle body gasket off. When I went to put it back on after replacing the TPS, I noticed the gasket that I had was too big. So I used quite a bit of RTV Silicone gasket maker to make one. And then tighten everything down and put the hoses in their respective places. After starting it, the ECM flashed me a map sensor code. i’ve checked the sensor and it looks OK, no corrosion and Connection is fine. I do not have a multimeter to test voltage or anything. I have replaced all the hoses I removed when taking off the throttle body. I have reset the ECM. After doing everything the only things that have changed is the TPS flash came back and my idol RPMs have went up about 200. I would really like to know what the problem is and how to fix it because it’s keeping you from work!

 

I think this is one of those cases where you need to get a multimeter. You don't need an expensive one, but you do need to check the voltages to see if the TPS is putting out the right voltage and all your voltage and grounds are working. Even minute adjustments of the TPS can cause idle and other issues.

If you want a suggestion for one, Amazon has a decent one for $22.

But there are others, however don't get too cheap or they are not going to be accurate.

Here's what you will want to be checking on the TPS, idle voltage and full throttle voltage.

Bu then the next thing is to check the MAP sensor and it's voltage as well.

The other tool I have found to be quite useful for reading the sensors is to buy a simple ODB-II reader such as Carista which is a bluetooth plug into the car, and then I use software like OBD fusion, Incardoc, Car Scanner and apps like that on my phone to scan and read it. The tool is somewhere around $20 as well. But it comes in handy when reading codes while testing or driving to see if the sensor is acting right.

I don't think swapping parts alone is going to find your issue at this point, I think you will have to delve in a little bit more.

 

If the accord is a 1990 an OBD-II reader won't help.

 

Ah, I wasn't thinking, for 1990 you will have to jumper to get codes, but it still doesn't change checking the volts on the items such as TPS, throttle, etc.

ODB1 Honda codes
https://www.smogtips.com/smog-questi...-Trouble-Codes

 

I fixed it. I plugged the hole for the MAP vacuum hose on the TB with gasket maker. I just had to pull it off and give the TB a good cleaning and scrape the gasket maker off the intake.