355 F355 Stuttering

Well-stated and agree 100% FWIW

 

So for some reason it jacked up the link I posted (why? Links get posted all the time - Operator error on my part? If so please educate me) - Anyway, just go here if you are interested - I would strongly recommend it - and if you are not the DIY type then just order the kit and have your local dealer or independent install it - does not cost that much and sometimes letting the pros do it saves money and improves the result in the long run - Cheers

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So @ Dear Moderator - Just out of curiosity why did the link I posted for Scuderia Rampante get starred out and therefore did not/does not work? Did I do something wrong? I see links posted all the time (and have used them) referring people to sites for things like floor mats and other items - Why was my posted link rendered inoperable? Just wanting to know - many thanks as always - Cheers

 

Basically agree, but I would say that material is relevant. If you examine the 355 harness you will find that all connectors are tin on tin or gold on gold. Yes, there are a couple of places where gold connector are used because the mating part has gold pins. Ferrari isn't stupid.

Diagnose the problem correctly. Based on you initial description it sounds most likely to be ignition related.

 

Testing another posted link =>

https://us.puma.com/us/en/pd/speedcat-ls-mens-motorsport-shoes/380173.html?dwvar_380173_color=01&dwvar_380173_size=0320

 

Not a moderator, but simply history. Some websites are blocked because of sponsor ship related issues.

 

Re-trying the Scuderia Rampante link =>

https://****************.com/product/gold-connector-kit/

 

Thanks - Yep must be it - Just posted an innocuous Puma link (awesome driving shows FWIW ) and it worked fine - Tried the SR link again and same result - Makes total sense - Thanks for the note - Cheers

 

StickyRx, same issue. Frankly, its pretty silly. But this place is pretty silly.

https://**********.com/

 

You DO NOT want to leave that car in the rain .... it will fill up with water in those spark plug ports.

As for the OBD2 port on the 96 car. It is on the left foot well. What you showed is the right foot well. If that is not found then the proper diagnostic port is a 3 wire connector next to the ECU inside the passenger compartment. Even on the RHD cars, they should be behind the right seat against the fire wall.

 

When I first got my 96 355 the major had just been completed and the car barely driven. I had some rough idling, missing and SDL. I ended up replacing the Cat ecus and thermocouples. That fixed the SDL. The roughness was sorted with new plugs, wires and fixing a few worn connectors at the fuel injectors. You can jiggle the fuel injector connectors with it idling and see if you get any changes. New bosch connectors and boots can be found from several places. My stuff came from Eagle day.

https://eagleday.stores.yahoo.net/

 

Not sure what plug that is. Perhaps the seat belt. By "behind the right hand seat", we mean on the carpeted firewall (between the cabin and the engine) under a leather-covered panel. If it's not behind there, then your car isn't a Motronic 5.2, but a 2.7.

It doesn't matter whether your car is a LHD or RHD. On a 5.2, the Motronic ECU is behind the right hand seat.

 

AFAIK, only USA cars have a proper OBD2 diagnostic port under the dash. The ROW has had to improvise with adapators on 5.2 cars.

 

I'm still trying to figure out what engine you have. Could you take a full photo of your engine for clarification. My '98 looks a little different from your car, but that could be because my car is a later year. Note that on a Motronic 2.7 car, the diagnostics are completely different (no OBD2).

 

It so happens I have a US 1996 355 in my garage with its guts hanging out. Here is the picture of the engine ECU compartment. The black connector, 3 pin, to the right of the picture is the OBD port.

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So on your N. American Motronic 5.2 (?) '96 car, that diagnostic plug is plugged into something? i.e. plugged into a harness going to the 16 pin (proper) OBD2 port under the dash?

My Australian car has a USA 5.2 ECU/system as standard (except for the 16 pin OBD2 port under the dash). I leave the 3 pin plug, shown in your photo, dangling through a cutout provided in the leather cover for easy access.

 

These pipes are part of the Secondary Air Injection system (used when the engine is cold). Leaks here may cause the O2 sensors to think that there is too much oxygen in the exhaust and the engine management system will pump too much fuel into the cylinders.

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As Mitchell says, your diagnostic plug is the 3-pin plug (circled). You'll need a "Fiat 3-pin OBD2 adaptor" to allow you to plug in your OBD2 scanner. Search the forum or use Google to find more information on these adaptors.

Inspect those other plugs for damage (white and clear ones). They are pulled through the firewall during engine changes and do catch on things. These plugs can have loose pins and damaged wiring.