Does my idle sound normal? 85 QV video

Hard to tell, but it sounds pretty identical to every 308 or 328 I have ever been around, including my Mondial. At idle, these cars sound more like boats then cars

 

I would say something is not quite right. Most likely fuel system related (rather than iginition).

I would first start looking for air leaks & split or leaking hoses.

Pull the plugs & have a look at them & get the CO level/mixture setup checked.

When you blip the throttle, how long does it take to return to idle?

 

This is why you need a carb 308! sorry, had to say it

 

How much better is it with clean air?

 

you can run a few minutes to see if the idle fixes, but do not go for a drive...monitor the engine personally.

 

Film it if you can & lets have a listen.

How is the warm up cycle? What does it idle at on cold start?

If it smells rich & it seems to be taking a long time to come off a throttle blip then you may need to clean (or better yet replace) your injectors. If one or more are not closing properly then it would show some of these kind of symptoms

I have just changed them on my 328 & the difference is noticeable. The idle is even down at 850 (measured with a digital gauge, not the rev counter which reads 1-200 high). It also returns to idle revs much faster after a throttle blip.

Your car doesn't sound bad & its not a million miles away - but I also don't think its quite right.

 

Personally I think 2K is kind of high (mine is around 1400-1500) but they are all different. US cars with emissions gear do seem to all idle up towards 2K from have I have read though.

The thing abou the whole KJet system is its quite sensitive to a couple of things.. Firstly if you have an air leak that can leads you astray when you set the mixture at idle (which then screws the mixture up across the system). An air leak can be a split hose (I had one in the long vacuum line that goes back above the wheel arch to the trunk) or could be a bad injector seal.

Secondly the injectors seem to be a "wear" item. As I said I have just replaced mine at 37K when honestly I didn't really think there was anything really wrong. I am very happy that I did it.

Its also worth taking the throttle body off and giving it a good clean with carb cleaner if it hasn't been done in a while.

 

Just don't think the fuelling is quite right.

 

doesn't sound any different...still oscillates.

slowly spray some carb cleaner in the intake few times while running.

if it helps, then you may have to clean some intake components.

 

(Assuming it is a US version) Two easy things to do at warm idle:

1. "Feel" the FV to confirm that it is vibrating -- no vibration = problem, and

2. Measure the voltage on the single output wire (while it is still plugged in) from the O2 sensor relative to ground at warm idle -- if it is not wandering slowly between ~0.1V and ~0.9V, you really aren't running/idling correctly.

 

These are good ideas. Where can you measure the O2 sensor output (at the ECU or elsewhere)?

 

FV = frequency valve = aka metering valve = aka lambda valve
Image Unavailable, Please Login
Image Unavailable, Please Login

 

Not sure which is more accessible (at the Jetronic ECU or here), but there is a single spade connector shown on the US 308QV schematic between the O2 sensor and the ECU (just follow the wires from the O2 sensor: 2 will end in a 2-pin plastic connector --- this is +12V power and ground for the internal electric heater; the single wire ends in a spade connector and is the actual sensor output wire).

 

Definitely not a good sign. Have to say that, on the K-Jet with Lambda and KE-Jet with Lambda models, it often happens that something goes wrong and, then, rather than properly diagnosing the problem and fixing it, people start turning the "tweaks" -- resulting in 2 problems! Please let us know what you find.

 

i cant even hear it!