Hard Idle cured on my 944S2. pictures!!
11-10-2002, 03:09 PM
#1
Track Day
Thread Starter
Join Date: Jun 2002
Location: Chico, CA
Posts: 23
Likes: 0
Received 0 Likes
on
0 Posts
Hard Idle cured on my 944S2. pictures!!
Well, I decided to tackle my hard idle upon cold startups (91 944 s2 cabriolet).
Symptoms were low or rough idle upon cold startup. Idle would dip back and forth between 900 and 600 rpm when left outside or very cold temp. when initially started. When car warmed up, dipping idle would go away, but the car still idled hard. Idle was not steady.
Procedure: Removed Idle control valve and cleaned it along with cleaning the throttle body. The ICV was all gunked up, so I assume it was not opening and closing freely, which is probably what was causing the car to run rough. Cleaned and lubricated it, put it back to together and now it has a steady idle. The procedure only took about 45 minutes and I didn't even have to remove the manifold. Simply removed throttle assembly and slid the ICV back down under the manifold. Easier than I thought it would be. I am going to replace the spark plugs, wires, cap and rotor next, so that should smooth out the idle even more. Hope this helps anyone with a similar problem.
I am posting some pics to help.
Nick Fox
1991 944 S2 Cabriolet
1986 944 n/a
Symptoms were low or rough idle upon cold startup. Idle would dip back and forth between 900 and 600 rpm when left outside or very cold temp. when initially started. When car warmed up, dipping idle would go away, but the car still idled hard. Idle was not steady.
Procedure: Removed Idle control valve and cleaned it along with cleaning the throttle body. The ICV was all gunked up, so I assume it was not opening and closing freely, which is probably what was causing the car to run rough. Cleaned and lubricated it, put it back to together and now it has a steady idle. The procedure only took about 45 minutes and I didn't even have to remove the manifold. Simply removed throttle assembly and slid the ICV back down under the manifold. Easier than I thought it would be. I am going to replace the spark plugs, wires, cap and rotor next, so that should smooth out the idle even more. Hope this helps anyone with a similar problem.
I am posting some pics to help.
Nick Fox
1991 944 S2 Cabriolet
1986 944 n/a
11-12-2002, 02:14 PM
#5
Drifting
Join Date: Dec 2001
Location: Sackville, Nova Scotia
Posts: 2,362
Likes: 0
Received 8 Likes
on
8 Posts
Does anyone know if the set up on the S is similar to the S2?? It "looks" the same in the pics.
I'd like to take the throttle body off and do some cleaning also.
944S Boyeee
I'd like to take the throttle body off and do some cleaning also.
944S Boyeee
11-12-2002, 05:59 PM
#6
Instructor
Join Date: Jun 2002
Location: Newporsche Beach, California
Posts: 230
Likes: 0
Received 0 Likes
on
0 Posts
Hey Nick, great procedure! Thanks for taking the time to post such a thorough, illustrated how-to. I didn't think it was possible to do without pulling the manifold...
...which I did about 6 months ago on my S2. This way also requires pulling the fuel rail and injectors (which all come out as one assembly after loosening about three bolts). You can leave the throttle body attached to the manifold.
Probably more labor involved my way, but once manifold is off, the access to the valve and all related plumbing is unrestricted. It also gave me a chance to remove the considerable gunk that had built up on the insides of the intake runners, and on the walls of the ports, and inspect all the wiring/tubes beneath the manifold too. I had always wanted to see what the ports looked like as well.
I was lucky with the manifold gaskets..they all stuck to the head and released cleanly at the flanges, so reassembly just required a bit of sealer.
Isn't it great to have a rock-steady idle?
...which I did about 6 months ago on my S2. This way also requires pulling the fuel rail and injectors (which all come out as one assembly after loosening about three bolts). You can leave the throttle body attached to the manifold.
Probably more labor involved my way, but once manifold is off, the access to the valve and all related plumbing is unrestricted. It also gave me a chance to remove the considerable gunk that had built up on the insides of the intake runners, and on the walls of the ports, and inspect all the wiring/tubes beneath the manifold too. I had always wanted to see what the ports looked like as well.
I was lucky with the manifold gaskets..they all stuck to the head and released cleanly at the flanges, so reassembly just required a bit of sealer.
Isn't it great to have a rock-steady idle?
