martin
NAXJA Forum User
- Location
- Huntsville, AL
I have a 88 XJ and in the past year or so I replaced my TPS. I got out the instructions and set the feed back ratio to 83% like the book says. I took it into the dealer for a problem, the mechanic ran it on the test set and found a failed ERG. He also told me my TPS was out of adjustment and he put it back to spec for me.
I noticed the "at home" method has you use the transmisson connectior. The dealer method uses the engine connector since it is hooked up to the engine computer. The value at idle is 13% measuring on the engine connector.
I have heard on here that you need to use the Jeep/Eagle test set OR the snap-on MT2500. I have been looking at Ebay and finally bid on a used snap on unit. I had it deliver on Friday and over the weekend have been using it.
I used it on my 88 XJ and it only gives me current values, like everyone said, since the Renix has no memory. I then tried it on a buddies 88 oldsmobile with the buick 3800 V6. We did the TPS check and found he had a low value BUT no error code had set. He had installed a new TPS and used the multimeter method. So we adjusted his back into range.
I then took the unit to my cousin's and tried it on his 85 vette. We also did the TPS check and found he was out of range, he was also low. He had installed a new TPS using the multimeter method. We found this after our first drive - nothing like a 123 mph test drive We then set the TPS to the correct value using the snap-on tool then went for a second drive. He noticed it had more seat of the pants power but it solved his idle problem. He was sold just on getting a better idle.
We talked and concluded the multimeter method does NOT take in account any voltage drop in the vehicle harness. Using the test set you can find out what value the engine computer is using.
My thoughts are us renix XJ owners need to use the test set to calibrate the TPS, the multimeter is better than nothing but it appears the snap on tool is the way to go.
I did look a while and concluded I better buy a snap on scanner that said it had a "GM-FORD-CHRYSLER-JEEP" catridge. Some of the scanners had 93 cartridge but it only listed GM-FORD-Chrysler" so I was not sure. Also if you look on ebay make sure it has the Jeep-1 connector included for your renix XJ.
I noticed the "at home" method has you use the transmisson connectior. The dealer method uses the engine connector since it is hooked up to the engine computer. The value at idle is 13% measuring on the engine connector.
I have heard on here that you need to use the Jeep/Eagle test set OR the snap-on MT2500. I have been looking at Ebay and finally bid on a used snap on unit. I had it deliver on Friday and over the weekend have been using it.
I used it on my 88 XJ and it only gives me current values, like everyone said, since the Renix has no memory. I then tried it on a buddies 88 oldsmobile with the buick 3800 V6. We did the TPS check and found he had a low value BUT no error code had set. He had installed a new TPS and used the multimeter method. So we adjusted his back into range.
I then took the unit to my cousin's and tried it on his 85 vette. We also did the TPS check and found he was out of range, he was also low. He had installed a new TPS using the multimeter method. We found this after our first drive - nothing like a 123 mph test drive We then set the TPS to the correct value using the snap-on tool then went for a second drive. He noticed it had more seat of the pants power but it solved his idle problem. He was sold just on getting a better idle.
We talked and concluded the multimeter method does NOT take in account any voltage drop in the vehicle harness. Using the test set you can find out what value the engine computer is using.
My thoughts are us renix XJ owners need to use the test set to calibrate the TPS, the multimeter is better than nothing but it appears the snap on tool is the way to go.
I did look a while and concluded I better buy a snap on scanner that said it had a "GM-FORD-CHRYSLER-JEEP" catridge. Some of the scanners had 93 cartridge but it only listed GM-FORD-Chrysler" so I was not sure. Also if you look on ebay make sure it has the Jeep-1 connector included for your renix XJ.