Lancefitzgiben

Thanks again Panos..

I'm going to buy a peake out of my next paycheck (desperately need one) and I'll keep checking codes.

Driveability is greatly affected, but only for the first few moments after start-up.. it runs like a champ otherwise.

andy777

I am going to wait until it gets much worse as it only does it sometimes. My research suggects the throttle position sensor which is near the pedal.

nerio02

my guess is cps..

nothing by trottle positioning.. just offset timing i suspect..

but i can't tell you this for sure,because no one proved i'm right on this in practice

lots off hesitation treads,but no answers

what do you feel andy?? you press the trottle and its feels like it overfuels a bit .only in low rpm up to 2500 rpm..??

or do you have it in all rpm regions.?




so count my guess as" its a maybe ".. lol.

i got to be carefull or ard is going to kill me for saying something i can't back up ..

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with kind regardes

nerio02/dominique

Lancefitzgiben

I've also got a louder exhaust, which may suggest CPS..

gotta pull the codes though!

nerio02

iff you got a louder exhaust note too, then i think your spot on Lancefitzgiben.

andy777

Only at lower rpms and come to think of it only on hills. Just to be clear I am talking about less than half a second but I can feel it.

nerio02

some off us had a mature debate on the fact i stated cps sensors worsen by age..

there where believers and non believers. so i suggested i didn't mention it anymore as a sure thing so i would not mislead people in changing all the cps'ses..they aren't cheap to replace, so thats why i dont say its that for sure..but i can guess /suggest offcourse.

now i will tell you what i experienced some time ago, maybe you can see some symptoms you have..

my car had some hesitations when i pressed the gaspedal. it was a feeling like i overfueled the car for a half second.
press the pedal, almost no torque for a half sec, and then the needle rised like it schould
this occured only at low rpm and under 2500 rpm.once over that it was all fine when you pressed the pedal.

i suspected the car too overfuel so i began a search on timing..what controls timing? cps sensors . mine is a 99 model so after 9 years i changed them as a maintenance thing just for the sake off it.no codes to be found for anything at that time..not even a misfire code..
also what i noticed was some popping (backfireing sound when you shift down a gear)from to mutch unburned gas/fuel in the exhaust. thats why i suspected to mutch fuel/ bad timing in the first place.

after the replacement it was fine and more explosive again for driving..
the power was back in all areas.gained 7hp and some torque also on a dyno bench . i wanted to prove my point by numbers but the non- believers took it as not trustworthy proof due to dyno's numbers can vary. i agree with that argument.so that ended the debate on my side.

so for me it was the solution..

like a stated before, take it as a suggestion, no cure, because i can't prove it on paper.

TopEnd

Can CPS cause to the car to sound like it has an exhaust leak? I'm asking because I'm a little down on power and I thought it was because of an exhaust leak...

Neighbour

My car delay`s too when i touch gas pedal or accelerate. Had changed Maf`s, plugs, 2 of 4 o2 sensors, filters... Tomorrow i`m going to connect to code reader.

What is CPS sensors?

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02` Lemans blue/caramel
Luxury interior/M Audio/alcantara boot/SS Headers/SS Magnums/ESS tune

nerio02

cps sensor is a camshaft positioning sensor.they measure the timing on the cams .

there are four in our cars.
2 inlet and 2 outlet (exhaust) sensors

not that cheap too replace, but ive seen treads where they offer them for reasonable money in the past.50$ or so a piece..

allot off info too be found on the board about these. even how you ca install them yourself.

wich o2's did you replace neighbour? the front ones (pre-cat) or the back ones (post-cat) ? front ones are the most important because they check air-fuel ratio on our cars. the back ones just check emmisions.