308 Idle lopes

Dave,

I am NOT a QV expert by any stretch of the imagination so take my opinion for what it's worth. In a 2V FI'd 308, it could be a possible brake booster vacuum leak. Take a look at this link. It may help.

http://home.att.net/~ferrari/running2.htm

Dane

 

I believe the 1985 also has an O2 sensor...hunting idle can be a sign of a failing O2 sensor.

 

Sounds like you need to adjust the idle - the question would be what's caused it to be a problem? Have you had anything done to the car lately?

If not then the obvious thing to check would be whether you are running on all 8 cylinders - you may have dropped one. The most likely cause of that would be an ignition problem. A good place to check would be the front bank plug leads - especially the longest one supplying the cylinder on the right side of the car - these can sometimes come out of the securing clips, drop down onto the manifold & get a bit melted.

Also have a look at your throttle body, work the mechanism my hand & make sure there's nothing obstructing the butterfly & that it's closing properly.

If there's nothing obvious then I'd remove the spark plugs & see if you can see obvious signs of fouling anywhere.

FWIW I recently overhauled the ignition on my 328 just by cleaning up the plugs, taking the caps, rotors & all the leads off, cleaning up the contact points in the caps & on the rotors, testing the leads, then trimming the ends & remounting them into the caps. The thing wasn't running that badly before - but it runs a lot better now!

I.

 

Yes, i believe it could be due to running to rich. The 1985 308QV here was fine until the 60k service. They made it rich and yup, it was searching. Try leaning it out a touch and see what happens.

 

Not necessarily. A O2 sensor is a thermistor, that is to say it makes a low voltage electric signal from heat. When the car is cold, it will read approx 0.5v on the O2 output wire. Once the the O2 Sensor gets hot, it should range from near 0 volt to near 1 Volt. That is where it should be. If the sensor is defective, readings will vary slowly or not at all...most of the time, I have seen 0 on defective O2 sensors. Its an easy check... just touch a voltmeter's positive lead to to the O2 output wire, and ground the other lead.

Other than the O2 sensor, I have seen this kind of problem on two other cars (non ferrari). I'm not sure if your QV has one, but this almost sounds like a dirty Airflow meter.

Did you check for disconnected vacuum hoses or air leaks by spraying carb cleaner around the manifold? The carb clear will remove paint, so be careful.

 

i would get the mixture checked with co/hc machine i can say why the mixture is off but an odor is not a good sign.good luck.

 

I would check the TPS to see if it is adjusted right or is dirty/plugged. The engine will usually hunt whe the throttle position sensor in nor adjusted correctly. My 2C