[silveib]

well pretty self explanitory. I find when i slow down my rev's will hang at like 15-1800 rpms until after a couple seconds of being stopped then it will drop to its normal 800 ish rpm idle. Mods are in my sig. Never happened before i had the cams put in. I did do a search but no real difinitive answer. I did see some people say clean the MAF but i figured id throw this to you guys and see what you think.

 

[Yocrew]

TPS! (Throttle Position Sensor). Very common.

 

[silveib]

what about it? does it need to be replaced? can this also affect the performance of the car?

 

[killer ZETEC]

tps is starting to go. or its dirty. pull it out and clean it or replace it. (mine is dirty and i know it. (so is my throttle body) i have to clean both.

 

[silveib]

should i clean it similar to the way you would clean a MAF? i read about that in the how-to section..

 

[silveib]

double post....

 

[mlbbaseball]

you can also have a vacuum leak or a problem w/ the PCV

 

[silveib]

yea i am starting to think there may be a vacuum leak and i will check for that.
Now i have never really understood PCV. you think you could give me a quick break down on the system and what may be wrong with it?

 

[silveib]

i guess no one has any more input??

 

[mlbbaseball]

sorry bud, If I would have seen this earlier, I would have posted!! The PCV valve is an important part of a car's emissions control system. "PCV" stands for Positive Crankcase Ventilation. The PCV valve takes unburned "blowby" gases - gases that have escaped the combustion chambers by slipping past the pistons into the crankcase - and funnels them back into the intake manifold, where they rejoin the air-fuel mixture and are reburned. The PCV valve recycles these escaped gases, reducing air pollution and preventing moisture buildup inside the engine. The PCV valve is also important for preventative care for your car's engine. Because it prevents moisture buildup inside the engine, the build up of sludge in the oil is also prevented, which will help engine oil to last longer and protects the engine. A PCV valve that needs replacement may cause a rough idle or high hanging revs as a result of pressure buildup within the crankcase.


Any more questions for me??? lol

 

[1turbofocus]

The PCV wont prevent moisture/condensation from building in the engine but will take it out once once it heats back up to steam

Find a scan tool before you go further this will allow you to test the parts in question (TPS) , Vac leak and change the parts that need to be changed and not just guess

What have you done about adjusting the cam gears ?

Tom

 

[mlbbaseball]

guess I didn't do the best job of explaining!! lol

 

[1turbofocus]

You did a fine job just wanted to add to what you said

Tom

 

[silveib]

regarding adjusting the cam gears i did an old fashioned seat of my pants approach. And it worked rather well (picked up 3/10 in the quarter mile, and just feels/sounds healthier). I didnt see the sense in paying the dyno time especially now that i bought the JRSC, so they will have to be dialed in all over again (though not by da silva racing thats for sure).
mlb thanks for explaining that to me. The thing is the CEL light is not on but i suppose i could connect the xcal2 to see if its throwing and codes. Tell you the truth the rev hanging isnt all that bad, but its might still be worth looking into.
Thanks for the replies guys you have been alot of help

 

[Yocrew]

The revs hanging will get worse over time. Eventually it could cause your car not to start. I know this because I went through it. When you have high revs the 1st thing to check is TPS. It's attatched to you TB and easy to get to. When you take it off look at the silver ring inside. If you have a CAI you could've gotten water in it and now it's going down hill. Let us know what you find.

Tom, could the PCV even cause high revs?

 

[silveib]

i do have a cai.... will check it out