355 355 throttle position sensor

BOSCH 0280122004 Same as a 1995-6 Saab 900. DO a Google search. Typically around $100US. But before replacing, clean the contacts and make sure you don't have an idle control valve problem.

The ECU reads the position when you start the car. Make sure you don't depress the accelerator when starting. No calibration necessary.

 

Could you post a video of this occurrence? When does it happen? Engine cold, hot? What year is your 355? If you have OBDii, do you have a basic scan tool to check fuel trim values? To check multiplicative for lean mixture compensation, which could point to an air leak in the intake system.

 

If you have a UK car, you'll also need a "Fiat 3 pin OBD2 adaptor" and a 12volt supply (you can wire it up to the cigar lighter if you have a cigarette lighter accessory plug). I'm not sure if it shows fuel trims.

That LAUNCH authorisation certificate in the advertisement has to be fake

 

Depends on your budget and where you are located (prices and availability vary). I went for a low end reader and I don't think it has fuel trims. Just looking at the manual for that eBay Creader 3001, however, it does have fuel trims.

Note that as well as generic fault codes, the Motronics ECU produces Ferrari specific codes which you will have to ask us about. Note that on the 355, the reader will only read data from the engine Motronics ECU, not from all the other computers (You'll need a Ferrari-specific tool for that.... crazy expensive). An OBDII reader is a good start, though.

 

The one I have was 100 bucks and I think any obd2 has fuel trims. It needs them to adjust for closed loop control.
I don’t think the tps would do this but not positive. My understanding is it’s only there as a backup

 

Welcome back Grant !!!

 

Hi, I took my 355 powered replica for a dyno tune and we had to abort because the tuner said that the TPS was jumping around (primarily to the wide open position). This did not make the engine race, which confused me, but his laptop showed it doing so. The TPS is a bosch 0 280 122 005 ( This thread mentions a 004). The tuner somehow came to the conclusion that the 005 was wrong and that it should be an 001. An 001 is about 25 bucks and an 005, if you can find one can be 500 bucks. I believe that my engine was out of a 1995 (2.7) car. Any discussion of what was stock, TPS experience etc. would be helpful. I watched a U Tube video on how to clean one with Break Clean but another saying not to use anything but electrical stray lube. Again, any help would be appreciated.

 

First off lets see the pics of the Replica!

 

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fantastic!

 

damn ...

 

The same Ferrari part number (#158170) applies to the 5.2, also. I have a Bosch 0 280 122 004 on my car, but I don't know if it's original.

I might buy a 001 to see if there is any difference in voltage output.

I see some are made in Korea and China. There have been comments on eBay that these do not match Bosch specification.

 

How would he know it should be a 01?

 

I called the Bosch automotive tech help # 888- 715-3616 to ask what the difference between the 001, 004 and 005 but they are east of me and were closed for the day so that will have to wait for tomorrow if I can remember. I am going to reinstall my 005 after "cleaning" it and see if I have ruined it or it starts any better.

 

Engine rpms are based on actual throttle opening. The full open position on the TPS just switches the ECU to open loop operations.

(EDIT: open loop operations with full throttle is mentioned in the 5.2 section of the WSM, but I can't find it in the 2.7 section. Also, the 2.7 uses 3 positions on the TPS during normal operations, rather than 2 position on the the 5.2 car).

Experts?

During abnormal operations (MAF failure), the full range of TPS resistance values are used, not just IDLE/MED/HIGH.

 

Modern Bosch parts are often made in fledgling Eastern European democracies or worse and are not the same quality we used to see from the Fatherland. Most of the knockoffs are Chinese and it would be a better world if we just sank the ships they are sent here on.

 

004 is what the parts book calls for.

 

Maybe he matched the specs:

https://www.finjector.com/documents/51907d1b0b297/0280122001.pdf

From the WSM:

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Which parts book, Brian? My paper OEM parts manual doesn't mention a Bosch number.

 

I am not in favor of products from China BUT companies can institute qualify control supervision and get good products so I would blame Bosch, and other companies , if they don't monitor production to their homeland standards. That being said I won't willingly support another country who's goal is to overtake us.