Help! Throttle body issues!
07-10-2010, 02:59 PM
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Help! Throttle body issues!
So today I went to install a slightly larger ITR throttle body on my Skunk2 IM. The TPS on the new throttle body was damaged, so I replaced it with an IL4 OEM Spec TPS.
Note that I am switching from a stock OBD1 LS throttle body to an OBD2 JDM ITR throttle body. The differences, aside from the size difference, are that there is a vacuum hookup on top of the TB (next to the MAP) and there is no FITV attached.
Now the fun begins. The new TB was in mint condition, I cleaned it with STP TB cleaner here and there but otherwise everything seemed ok. I screwed on the TPS, with gasket, in the same position as it was before. I installed the MAP sensor w/ o-ring gasket. After that, I checked the new TB gasket to make sure it had all the same ports and openings and then bolted it on, hooked up the throttle cable and coolant lines, plugged in the sensors and started the car after a final check. Note that the ECU was disabled during the install.
Upon starting, the car was slightly warm. Radiator was showing around 110F, which I guess is still considered a fairly cool start.
So I start the car - and immediately it revs to 4500 rpm. If I leave it on, it roams between 4000-5000 rpm but I didn't leave it on for more than 30 seconds. In one instance I let it go to 5000 rpm and the ECU threw a code 7 for the TPS. It is saved in the ECU but I can't get it to throw that code again.
I double checked for any sort of air leak, tightened all the bolts a bit more and started again. Same result. After toying with idle screw and checking wiring for a good half hour, I got frustrated and decided to bolt on the old TB again. The TPS on the old TB was never touched. This time I had an FITV to deal with, so I made sure that unit was clean in addition to the IACV. I also made sure the adjustment screw in the FITV was tight. and that all seals were in place. I mated the FITV to the TB and bolted the unit onto the manifold. I plugged in the MAP and TPS and then restarted the ECU. At this point the car is basically how I had it the day before, and it was working 100% fine.
Same result, except this time its roaming between 3000-4000. With the engine speed a little lower now, I decided to let it run for a bit longer to see if it was maybe trying to get coolant. After topping it off it still does the same thing.
Any ideas?
- Matt
Note that I am switching from a stock OBD1 LS throttle body to an OBD2 JDM ITR throttle body. The differences, aside from the size difference, are that there is a vacuum hookup on top of the TB (next to the MAP) and there is no FITV attached.
Now the fun begins. The new TB was in mint condition, I cleaned it with STP TB cleaner here and there but otherwise everything seemed ok. I screwed on the TPS, with gasket, in the same position as it was before. I installed the MAP sensor w/ o-ring gasket. After that, I checked the new TB gasket to make sure it had all the same ports and openings and then bolted it on, hooked up the throttle cable and coolant lines, plugged in the sensors and started the car after a final check. Note that the ECU was disabled during the install.
Upon starting, the car was slightly warm. Radiator was showing around 110F, which I guess is still considered a fairly cool start.
So I start the car - and immediately it revs to 4500 rpm. If I leave it on, it roams between 4000-5000 rpm but I didn't leave it on for more than 30 seconds. In one instance I let it go to 5000 rpm and the ECU threw a code 7 for the TPS. It is saved in the ECU but I can't get it to throw that code again.
I double checked for any sort of air leak, tightened all the bolts a bit more and started again. Same result. After toying with idle screw and checking wiring for a good half hour, I got frustrated and decided to bolt on the old TB again. The TPS on the old TB was never touched. This time I had an FITV to deal with, so I made sure that unit was clean in addition to the IACV. I also made sure the adjustment screw in the FITV was tight. and that all seals were in place. I mated the FITV to the TB and bolted the unit onto the manifold. I plugged in the MAP and TPS and then restarted the ECU. At this point the car is basically how I had it the day before, and it was working 100% fine.
Same result, except this time its roaming between 3000-4000. With the engine speed a little lower now, I decided to let it run for a bit longer to see if it was maybe trying to get coolant. After topping it off it still does the same thing.
Any ideas?
- Matt
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