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Subject: Re: 95 monte carlo, erratic idle Author: Winfield Cohen [ Next Thread | Previous Thread | Next Message | Previous Message ] Date Posted: 22:54:08 10/27/03 Mon In reply to: Joe 's message, "Re: 95 monte carlo, erratic idle" on 12:33:07 07/02/03 Wed I'm experiencing these same symptoms with my '95 Z34 with 56K on it. I've noticed I now hear a brief hiss when I turn off the car. Does that seem to be another sign of this problem? One mechanic friend I'd talked to thought it may be the idle air control valve??? Any estimates on cost to replace the manifold gaskets?? Thx for any help!! -WC >I have a 97 monte carlo z34 with 103,000 miles. The >problem you are all experiencing is the upper and >lower intake manifild gaskets. The reason that the car >revs high and low repeatedly is becasue of a vacuum >leak. The enginge is trying to compensate for the lost >vacuum by sucing in more air. Look at the gasket that >connects the plenum to the mass airflow sensor. There >are a few bolts. Peen a new gasket and then use some >blue silicone that can withstand the heat. Make sure >you put enough silicone to seal it. I suggest putting >some on your finger and smearing it all around on both >sides for maximum sealage. Do the same procedure for >the lower intake manifold. This should solve the >problem.>>>>Have a 1995 Monte Carlo Z34 w/3.4 >l.(110,000km) >>When >>>>>car is started engine revs up high then down to >>>almost >>>>>stalling, then repeats again until car is warm. >>>>>Usually happen when weather is cooler (fall till >>>>>spring).I've taken it to shops and they cleaned the >>>>>throttle bore which helped for a little while and >>the >>>>>IAC motor was replaced. Is this a vacuumn leak, or >>>>>sensor? Can you help >>>> >>>>I've got exactly the same issue with my 95 Z34. Did >>>>you ever find a fix? >>>> >>>>Thanks, >>>> >>>>Darren >>>I've also experienced this problem any help would be >>>appreciated. > >>> > >>> THANKS FOR ANY FEED BACK > >>> > >>> CORY >> >>All, >>I have a 1995 Monte Carlo Z34 with 91K miles. I had >>the exact problem you described and I tried >>everything. I replaced the Mass Airflow Sens,new wires >>and plus, cleaned out the whole fuel system.. nothing. >>I then read somewhere on another Monte Carlo site that >>the problem was the upper and lower intake manifold >>gaskets! I figured what the heck so I had the upper >>and lower intake manifold gaskets replaced which >>corrected the problem. >>Suppossedly, the 3.4 DOHC GM engines are notoriously >>known for this problem. I now have smooth starts no >>matter how cold it is. The car also has much better >>acceleration. [ Next Thread | Previous Thread | Next Message | Previous Message ]