Tps

[oldtimer]

I am sure this subject has been address. I apologize if I am reviving the topic. My question is: What sign does one experience when a Throttle Position sensor (TPS) had gone bad? I was inquiring about getting one from a local parts store, the first thing the parts guys ask was: Is it hard to start? Can someone share their experience when TPS was going bad or is bad.

[M3ayhew]

Hard starting it one, when it does start you wont have any response from throttle input and nomally it will want to die it it goes below a certain rpm

[RED IS 91]

check out this webpage detailing how engine management systems basicly work.
Hope this helps .There is a test for the TPS in the bentley.
Good luck

http://www.motorsave.net/enginemanagementsystems.html#1

[vfstyles]

I am sure this subject has been address. I apologize if I am reviving the topic. My question is: What sign does one experience when a Throttle Position sensor (TPS) had gone bad? I was inquiring about getting one from a local parts store, the first thing the parts guys ask was: Is it hard to start? Can someone share their experience when TPS was going bad or is bad.


when my tps failed i was driving down the road and the car died when i tried pressing the gas. It died in the middle of the road i was trying to cross, luckily i had enough speed to coast down the hill. If you are fairly certain that TPS is bad just replace it. when it finally does fail completely you dont want to be driving, trust me. started hard but would idle fine. As soon as you push the throttle it would hesitate to rev or just not rev at all.

like previously mentioned, check the sensor using the process listed in the bentley. Replacing the TPS kinda sucks because you have to remove the throttle body to get one of the screws out of the TPS because its mounted in between the intake runners of the manifold. Replace both TB gaskets while you are in there. Be careful when re-tightening the TB to the manifold. There are three nuts and a bolt to fasten the TB to the manifold. I broke the 1 bolt off in the manifold and had to pull everything back apart to extract the broken piece.

[oldtimer]

thank you for all the inputs. I finally found the check in the manual. since I am the second owner of the car and the previous pretty much didn't take care of it i decided to replace. Oh yeah I was wondering how I was going to get to the second screw without taking the TB out. I found a new TPS for a good prize I have a week end work for me. Additionally, a new topic here and I don't mean to piggy back on this one. I am doing some testing on engine performance and mileage improvement. I have not been successful in finding an article that gives me the PMG rating of this model. Can some someone share what king of MPG this model was rated when new.

The theory I have been playing with is being tested on my 1984 318i thus far I have gain 3-5 miles per gallon both city and highway. The gain is also on the performance and torque and throttle response. I want to put the test on this car but don't have a manufacturer MPG baseline.