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Car Forum / Porsche / Porshe 944 / November 2004rough idle
hi when i first start my car, it has a rough idle where the rmp's slightly vary between 900 and 1200. sometimes, it gets real crazy and kinda bounces. the rpms will go all the way to about 1500 and drop all the way to about 500. it continuosly does it until i drive for a bit and it warms up. kinda sounds like im slightly hitting the gas and letting off of it non stop. my guess is it might be a sensor of some sort, but dont know which one. anyone have any ideas? thanks dave Had the same problem on my car. Was the ICV, or idle controle valve, which porsche calls the auxilliary air valve. Bosch part number #0-280-140-132, which runs at 59.25 at Pelican. The way to test this, or what I did, was leave the engine to cool, disconnect the plug that attatches to the ICV, start the car. If there is no change then it's probabaly bad. If not, keep searching! Good Luck Marcel (Excuze the spelling, I'm Dutch) > hi > when i first start my car, it has a rough idle where the rmp's slightly [quoted text clipped - 6 lines] > > dave Common problem on my 944 every few years. Loosen the rubber boot on the ICV and spray a good dose of gumout into the valve area. Let it soak overnight. May cure your problem. Crud builds up on the valve and makes it stick. Very noticeable in the Winter. where about is the ICV? im still new at learning where all this is, since its my first porsche. let me know, and i'll be sure to check it out. thanks alot! dave I own a 83' model and the ICV is located underneath your inlet. If you stand on the left side of your car (seeing from front), look over your fuelrail and under your inlet. It should be there in the middle. If you own an older car (post 85 1/2) then I am not sure. Marcel > where about is the ICV? im still new at learning where all this is, since > its my first porsche. let me know, and i'll be sure to check it out. > thanks alot! > > dave Dave, I think I'm having the same problem. Did you get the problem fixed?? Thanks, Doug Dave, I think I'm having the same problem. Did you get the problem fixed?? Thanks, Doug hey sorry i havent been on for awhile. been busy. did you check the problem out (lavadg)? i havent had time to check it out. if you get it fixed let me know what you did, and i'll do the same if i get it fixed before you. dave Hi, I am new to this posting and new to porsches as well. I recently bought a 1987 924s which had a very rough idle when I bought it as well as noise vibrating from the back end. I remembered having go-karts when i was younger and how you can adjust the idle so i decided it was worth a shot. I adjusted the idle control screw and in doing so I raised the idle a tad and the rough idle dissapeared.I also tightend the rear hatch brackets where the glass hatch locks to the chassis. This resolved the rough idle and the noise from the back end went away completley. I was quite pleased. I dont know of this helps but it helped me. Thanks what idle screw, ???? the engine idle is controlled by the computer... no user adjustments available... >Hi, I am new to this posting and new to porsches as well. I recently bought >a 1987 924s which had a very rough idle when I bought it as well as noise [quoted text clipped - 7 lines] > > > what idle screw, ???? I would guess he means the air bypass adjustment, this will cause idle changes, but is only a mask for symptoms that indicate a problem needing to be addressed. (ie vacuum leaks) Bernard don't know for sure about the 924S, but on the 944S, you can adjust what looks like an idle adjustment - it sets the clearance between the throttle butterfly and the throttle bore when in the idle position. In theory, you set this so the throttle doesn't stick, but it can act like an idle adjustment - but beware - if you use it to raise the idle, you will probably find that the throttle switch never signals "idle" to the computer, so the air bypass valve will never become active, making the car more prone to stalling when cold (among other things). The advice to read and understand the manual is good. > what idle screw, ???? > [quoted text clipped - 10 lines] > >and the noise from the back end went away completley. I was quite pleased. > >I dont know of this helps but it helped me. Thanks Bill, the 924s is a 924 body with the 944na engineand running gear.. >don't know for sure about the 924S, but on the 944S, you can adjust what >looks like an idle adjustment - it sets the clearance between the throttle [quoted text clipped - 39 lines] > > get the shop manuals and read before you start screwing around with "adjustments" the 924S is not some pos Chevy... >Hi, I am new to this posting and new to porsches as well. I recently bought >a 1987 924s which had a very rough idle when I bought it as well as noise [quoted text clipped - 7 lines] > > I think what i adjusted is the throttle response cam. It has a nut that can be adjusted. I have seen a mechanic do it before on one of my old cars so that is why I even attempted to adjust it. It is on the top center of the engine, adjacent to the injection boot.It looks like a cirle with an arm attached to it. It has a spring attached to it and it is pulling a wire leading into the chassis of the car toward the dash. I thought this was the throttle wire..maybe im wrong? I figured over time this "nut" got loose and so i tightened it like a half revolution and the car increased its idle so that the vibrating stopped. Does this sound like it makes sense. Sorry if i offended some of the pros with my presumptous adjustent.. I have since bought some manuals and I am awaiting their arrival in the mail. Has anyone adjusted this peace before with same results? Any feedback is appreciated.. Frank You can do that and you can also allow more air into the plenum with the air bleed screw. The tree huggers get excited about this because the enrichment may not be compenstated for by the computer. Most Bosche systems control the idle with the air bleed and computer. There is a procedure for adjustment but requires an attachment to the oxygen sensor. If it runs better and smoother thats the important thing anyway. Sounds like you just speeded up the idle rpm. Someone else wrote that this isn't a cure. It hides the problem. He's right. My baby had a rough idle, and I looked like hell to find an adjustment. Never did, so I sprayed WD40 around the intake manifold. When the spray temporary sealed my intake leak, the idle smoothed out. Problem diagnosed. I picked up some intake gaskets and fix the problem in a couple of hours. Not a tough job at all. > You can do that and you can also allow more air into the plenum with > the air bleed screw. The tree huggers get excited about this because [quoted text clipped - 3 lines] > oxygen sensor. If it runs better and smoother thats the important > thing anyway. |
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