Why does my F 355 stall out (almost) when the fan kicks on?

Sorry to here

1 thing I would do is look at the last thing you did to the car, wire the camera
Disconnect it, if the car hesitated when you installed it that makes no sense unless you messed something up
Check fuses

Good Luck and dont freak out, think rational

 

I'm sure its something real simple if the alarm beeps twice
If its an F1 maybe neutral switch.
Again most likely from something you last touched on the car

 

Sorry to hear of your continuing problems. But as my previous post suggested I did not believe that the "fix" was all there was to this. You just can not go off with these internet fixes without first ascertaining that there isn't some other underlying problem. It doesn't matter how expert the person suggesting the fix is, there is no substitute for proper diagnosis and that can not be done over the internet with no contact with the actually car.

Again, sorry to hear of the continuing problems and I do hope you get the car sorted. It's certainly no fun to have to be shelling out hard earned cash over and over again, particularly if it is a economic hardship. Best of luck going forward.

 

Are you holding the key in the start position for a few seconds? For whatever reason, mine sometimes needs it held in the start position to 5 to 10 seconds if it's been sitting a while. It's caught me out once or twice thinking the battery needed a charge, but if I held it on start for 5 seconds or so it'd kick over and be fine.

 

Goth, I appreciate that figure but aside form the fact that I can envision a number of other flow paths (I spent the first 10 years of my career as an aerodynamicist analyzing jet engine intake ducts and exhausts) I would like you and others to consider what happens when the fan is NOT running and the car is sitting still idling. If the fan is not running then the air inlet duct going to the engine will be sucking air both through the door jam area and from behind the radiator as shown below. There is nothing to stop the engine from sucking some portion of the intake air from behind, and through the radiator. There is no check valve. So air heated from passing backwards through the radiator is going to be present when the car sits idling and the fan is off. I would suggest that if the fan switching on is the issue it is because of what Dave Helms mentioned, the sudden drop in pressure in the duct results in starving the engine of intake air and the engine stumbles. [edit] As I think more about it, blocking off the corners of the radiator should actually make that effect worse since, if there is back flow through the corners of the radiator it would tend to lessen the magnitude of the pressure pulse. With the corners blocked off there is no "pressure relief" so to speak. [end edit]
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an f-car having more than 'one' problem ...... who would have thought ..... I don't think anyone with any 355 experience did ....

it is quite established that 'sorting' a 355 ......... is not as easy as 'sorting' most any other car and it may take quite a while to get it right .... and even then, issues will still pop up ......... but you have to start somewhere ......... so correct your headers and check the entire exhaust system ..... check vacuum levels on all TBs ..... check your coolant hoses (especially the small ones on the reservoir) and the coolant system in general .... check your thermostat function ..... o2 sensors ...... pull your DTC codes ...... etc etc*

*Note: the possible cause or causes should not be limited to the component check list above. Be patient, be methodical, keep posting and doing forum searches here, as well as in the Technical Q&A Section ........

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Interesting hypothesis John (post#58) ............. except when the 'shrouds' are installed as illustrated in the other thread ......... the fan can and still evacuates just as much air from the duct cavity as before (possibly more, as the warm 'back flow' is no longer reverting to the front of the radiator) ....... the 'shroud' result being, the 'fan on' engine stumble is reduced to very near zero. Which would indicate the 'air pressure' in the duct cavity/engine inlet, is not appreciably diminished during the 'fan on' condition.

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