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san rensho replied to moxster99's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)A rotary polisher/sander with a wool bonnett that you don't mind throwing away and rubbing compound. If you are really particular you can then finish with polishing compound.
To check if its the aos, with motor warm and idling take off the oil cap and put your hand over the opening and seal it gight. You should feel the slightest vacuum. If there is significant vacuum the problem is the aos and the sound you hear is air getting sucked past the rms. If thats the case dont even start the car. You could very easily suck the oil out of the crancase into the intake leading to hydrolock which will ruin your motor.
My diagnosis is that you have the movie 2001: A Space Odyssey in your motor.
san rensho replied to DustyBags's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)To check if the unplugged module was causing the vacuum leak, remove the plug and look at the MAF reading and fuel trims (FRA/RKAT)then plug the hole, If the Maf reading goes up and the RKAT/FRA readings go down then that was your vacuum leak.
san rensho, remember this thread? http://986forum.com/forums/general-discussions/49666-p0410-secondary-air-injection-system-cylinders-1-%96-3-a.html Check the air ports on the heads... You will have to drop the three-way catalytic converters to inspect the ports. Ah yes, remember it well. I was hoping that was not the problem. But in your case, the Durametric trace shows the SAI system was not working, Correct? At start the voltages should go to near zero until the pump shuts off and then they should track as shown in your trace. In my case, the trace shows the SAI system is working, so i guess I'll take alook at the SAI components before I tear into air passages. By the way, if the SAI system works on vacuum, how can it inject air into the exhaust, or am I not understanding how the system works.
No mods. I recently replaced the valve that goes from the EVAP canister to the throttle body, so I guess I better check that again. When it was bad, I diagnosed it by pinching off the connection at the throttle body and the MAF reading, which was low at around 9-10 went back up to within spec, so I guess I'll start there since its an easy diagnosis. Is this the purge valve you mentioned? I hate messing with the evap system, its real pain. When I remove the cap at the filler tube, the idle stumbles and changes, so I think I'm ok with the tube.
I ran the diagnostic and everything checked out. Both pre cat O2 sensor voltages went to near 0 after I started the car, the post cat sensors straight lined at a higher voltage than the pre cat sensors and after a few seconds, also wnet down to near 0. Then, once the pump shut off, the pre cat sensors started to track sine waves and the post cat sensors went up and tracked slightly wavering straight lines. So I'm thinking its an intermittent problem with one of the components, but it still doesn't explain the low MAF readings, which is still around 10-12.
2000 2.7L I've been getting regular (about every 2 weeks or so) CEL for the SAI system P 0410 "signal implausible" as well as 1128 and 1130 which indicate the fuel trims are at full rich. The MAF is reading lowish, around 10-11 when it should be at 15. This leads me to believe that I am getting a vacuum leak somewhere in the SAI system. Does that sound right and if there is a vavuum leak from the SAI, what are the usual suspects?
san rensho replied to dammad's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)you can also try removing the spark plugs, pressurizing the cooling system and listening in the spark plug holes with a piece of flecible tubing for the telltale hissing of escaping coolant.
san rensho replied to Ronnie38's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)Let me guess. You went to Miami Beach during a high tide? Thats what got mine.
san rensho replied to MiamiC70's topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)All tie rods are adjustable but they don't affect handling other than adjust the toe. I think what you mean are adjustable control arms. Tarett makes them, I haven't used them but they are fully adjustable.