| Author |
Message |
Peter Polasek (Peterp)
Junior Member
Username: Peterp
Post Number: 73
Registered: 8-2002
| | Posted on Wednesday, April 16, 2003 - 7:39 pm: | |
The following thread briefly discusses the coolant sensor (and more details about idle settings):
http://www.ferrarichat.com/discus/messages/112/1029.html |
Bill White (Nc_newbie)
Junior Member
Username: Nc_newbie
Post Number: 65
Registered: 2-2003
| | Posted on Monday, April 14, 2003 - 2:36 pm: | |
My Mondial 3.2 runs and idles fine but I adjusted the two idle adjustments by trial and error. So I tried this procedure today. My idle would only go down to about 800 rpm with the stop screw all the way out and the bypass completely closed?? I pushed on the butterfly and got it down to about 650. So I set it back to where I had it. Any ideas?
I've checked my auxiliary air device and it is closing. I can not find any vaccum leaks.
The only thing I could find in the archives about this temperature sensor was related to the cooling fans. How does this sensor affect idle?
Thanks
Bill |
Giang Hoang (Spidersense)
New member
Username: Spidersense
Post Number: 37
Registered: 10-2002
| | Posted on Sunday, April 13, 2003 - 8:19 pm: | |
Peter,
Thanks for great response. The problem just started to occur, so I'm guessing it isn't the factory preset throttle stop. The low idle problem only occurs when warm, so the temperature sensor may be a good place to look. I'm crossing my fingers on cleaning the throttle body though.
Thanks again.
James
86 328GTS
87 328GTS |
Peter Polasek (Peterp)
Junior Member
Username: Peterp
Post Number: 70
Registered: 8-2002
| | Posted on Sunday, April 13, 2003 - 7:15 am: | |
There are two screws related to idle -- the large hex nut idle adjuster and the throttle stop. The throttle stop is supposed to be left at the factory preset position and the hex nut is used to set the idle to 1000 RPM. If the throttle stop has been changed to other than the factory preset (which is not unlikely over the history of the car because it looks like the screw you would use to adjust idle), then it won't idle reliably at the same speed. This was the case for my car (mondial 3.2) and I knew the previous owner had changed the throttle stop. I reset the throttle stop according to Kurt Kjelgaard's tip in:
http://www.ferrarichat.com/discus/messages/21/606.html
This is a long thread, so search for Kurt with ctrl-F. This worked well, the car idles great now. Part of the procedure requires that the car run at 450 RPM with the throttle stop closed -- I didn't think it would run at that RPM even for a few seconds, but it ran find. The dashboard tach does not really read very accurately at that level, but you can still get it close. I have since purchased a diagnostic tach ($30 at Sears) and will fine tune it, but the car idles very well even with the dash tach setting.
It definitely is worth spraying the throttle body with cleaner -- it didn't help my car but has been reported to fix many 3.2 idle issues. There is also a temperature sensor coming from the radiator which could be the cause -- check the archives for the procedure to test this.
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Craig Dewey (Craigfl)
Member
Username: Craigfl
Post Number: 566
Registered: 1-2001
| | Posted on Friday, April 11, 2003 - 6:35 am: | |
Another suggestion....
Periodically, my warm idle is too low. I have found that if you pull the black accordian tube off the throttle body and clean the butterfly and the body of buildup, it will idle smooth and properly again. |
TomD (Tifosi)
Advanced Member
Username: Tifosi
Post Number: 3201
Registered: 9-2001
| | Posted on Thursday, April 10, 2003 - 3:08 pm: | |
I would not adjust the screw but would imagine that regulator should be checked as a possible problem |
Giang Hoang (Spidersense)
New member
Username: Spidersense
Post Number: 33
Registered: 10-2002
| | Posted on Thursday, April 10, 2003 - 3:06 pm: | |
I can picture that no problem. But when cold, the engine idles ok, only after the engine is warm does it stall. Or are you saying that I should adjust this screw when warm?
I don't want to 'mask' problems though, anything else I can easily check when i'm there this weekend? |
Jim E (Jimpo1)
Intermediate Member
Username: Jimpo1
Post Number: 1606
Registered: 7-2001
| | Posted on Thursday, April 10, 2003 - 1:18 pm: | |
When standing at the rear of car, reach over about the center. You'll see a black accordian tube that runs from the throttle body, down. On the left side of the bottom connection of the accordian tube, there is a 'screw' on the end. Turn the screw by hand, you'll hear the idle go up or down, depending on the direction you're turning it. I believe this is the regulator valve that Tom is referring to. The tube is about 3 inches in diameter, and the head of the screw on the end is about 1/2 inch. I'm not a mechanic, but I know this works because my mechanic showed me! This 'tube' is between the engine and the 'trunk' of the car. Hope this makes sense, I'm looking at an engine picture while describing it. |
TomD (Tifosi)
Advanced Member
Username: Tifosi
Post Number: 3194
Registered: 9-2001
| | Posted on Thursday, April 10, 2003 - 12:22 pm: | |
I beleive there is a regulator or valve which adjusts the idle when cold, I would start with this |
Giang Hoang (Spidersense)
New member
Username: Spidersense
Post Number: 31
Registered: 10-2002
| | Posted on Thursday, April 10, 2003 - 11:24 am: | |
Guys, I'm trying to troubleshoot my dad's 328 GTS. He says when the car is cold, it idles ok. When the engine is warm, the idle crawls to 500rpms and then stalls. He now brakes with his left foot at red lights. I'll try to visit him this weekend and take a look, but any ideas at what to look for or try?
I know he has recently replaced the spark plugs, extenders, and the fuel injectors.
Thanks in Advance...
James |