Throttling issues

[big tone]

well how to explain.. when im driving or just cruising eg highway. whe ever i use about 5 - 10% of throttle the car seems to de accellerate and when i slowly push the accellerate the car has nothin nothing nothing then all of a sudden it just jumps but its only doing it every now and then..

could this be a tps problem? its almost like there id nothing from 0% - 10%throttle but then some times its nice and smooth..

any suggetsions..

[big tone]

oh yes its an ek1 with a stock B18c7

[eght]

you can start with checking that all the hoses going in and out of the IM is connected properly and that all the lines are not leaking. i've seen a car that had one of its hoses disconnected and it would have no low end power (sluggish from idle to probs 2500? then it'd be normal) and found that it was a disconnected hose. reconnected that hose and all was fine.

what ecu are you running?

any funny noises?

it could be a tps problem but doubt that..anyways, for the sake of troubleshooting..check your wiring between the tps and the ecu and check that ur tps is still working using a voltmeter. there is a diy guide on how to test your tps.

[beeza]

Sounds like it could well be the TPS.I would Collaberate the Voltage on the TPS,then go from there.

Is the TPS riveted on or screwed on? If it's riveted,you will have to angle grind them off then use screws to put it back on.That's why it's better to have a spare Throttle body so you can get the right screws before you take it off.If you take it to someone they can do it for you.Take the TB off,grind the rivets off,replace with screws and another TPS then you will need to collabrate the voltage on the TPS,here's a DIY.
http://www.ozhonda.com/forum/showthread.php?t=100843

I've been meaning to write it clearer but instead of using pieces of wire I taped needles onto the positive and negative probes on the voltmeter,then stuck them into the wires on the TPS.It's easy,I knew nothing about it,I just stumbled accross it on the net...

[big tone]

its a p73 ecu came with the convesion 2000 or 2001 B18c7 i think the tps has been replace b4 but the prob b4 was @ 1800 - 2000 the engine would just jump up n down like i was a learner driver bunny hopping all up the road.. now it just has nothing till i get over about 10% throttle..

i do have a p72 with s300 ready to go in to it, just need to save for a tune.. and find a tuner to do it too.. but thats another story..lol

[big tone]

all hoses are checked and fine..

[beeza]

You still should Callerbrate the Voltage on the TPS.

[big tone]

cool thanks for that wont be able to do it soon, i did reade a few post and i think i can get my head around it.. thanks for the help ill let you know how i go..but why im confused is why it only sometimes does it??

[big tone]

and mainly after i give it a good ful throttle through 1st 2nd and sometimes third...

[Paul1985]

Your throttle butterfly could be sticking every once in a while.

[beeza]

cool thanks for that wont be able to do it soon, i did reade a few post and i think i can get my head around it.. thanks for the help ill let you know how i go..but why im confused is why it only sometimes does it??

I know I know but when ya fix the problem it goes away so go figure...

[eght]

u have an s300?? use it... run a base map and go to the 'tps' tab and in the middle of the window you can see a min and max tps reading...

with the ignition on (engine not running) press read on the min tps and in the white box a number close to 0 will automatically fill. then depress the accelerator pedal to its maxim and press read on the max tps and in the corresponding white box a number cloe to 100 will automaticaly fill. then upload to your s300 and see if that fixes your problem.

i think the tps has been replace b4 but the prob b4 was @ 1800 - 2000 the engine would just jump up n down like i was a learner driver bunny hopping all up the road

can you tell me if this is a similar or even better the same problem? you hold the accelerator pedal aiming to hold the rpm @ 2000 but instead of the engine holding at 2000 it bounces up and down between your idle, say 900 and 2000 rpm continously until you release the accelerator pedal??

if you have that problem then i dare say its not your tps sensor, its the wiring between the tps and the ecu. my inference is that because the tps uses voltage to communicate to the ecu, a very minute source of voltage might i add, when you solder the wires you change or disrupt the voltage flow between the tps and the ecu resulting in an incorrect signal to the ecu.

however there is a fix, which is above using the s300 to "cover up" the flaw.

another way to tell if your ecu aint getting the right signal is if the min and max signals are very off. e.g. min is -5% and max is 90% obviously means your ecu aint receiving the correct signal..if it were it'd be min=1% and max=99% or so. but the beauty of the s300 is that the reason why you take those readings is to let the s300 know the correct mins and maxs and it adjusts accordingly to manage the engine properly.

also there is a guide to calibrating the tps and what not in the s300 manual.