Hondata

Now we had problems with 3 p28.
-followed hondatas install instruction.
-soldered by a professional (Service soldering for sony/Nokia/LG etc)

two of them gets hickups, when driving the car (With a dynoed map, This is not the issue)

the car drives fine for 2 minutes, then main relay start clicking crazy.
and the car gets a hickup/bupy rinde, like the map are getting on/of/on off.
tried with a Hondata soldered ecu and problem are gone(same car, same map, same s300 daughterboard)

the other (on another car)
here we took OBD2 -1 socket from a fried ecu and installed to convert the p28.

(This also has a dynoed map(on another ecu borrowed)
car ran fine after installing these ecus.

first- idles wery low, wont respond to throttle, then suddenly rpm flies like crazy and engine stalls and stop.
The installation looks exactly like the one from the "good ecu"

Hondata can you give me some clues where to start looking? Im 100% positive the problem lies in the ecus

Check that the heat sinks for the voltage regulators are bolted down correctly. Carefully check all soldered joints for quality. If you provide pictures then we can assess if they are likely to be the cause of the problem.

Hondata wrote:Check that the heat sinks for the voltage regulators are bolted down correctly. Carefully check all soldered joints for quality. If you provide pictures then we can assess if they are likely to be the cause of the problem.

Are you thinking about the component that have an alubar attached and smeared with cooling paste to lead heat to the ecu chassie?

Yes. If the ECU works at first, then starts to cycle the main relay, it could be the voltage regulator overheating. Otherwise you may have to conclude that the ECU is damaged, and it is not worth the time to diagnose which component is faulty.

Hondata wrote:Yes. If the ECU works at first, then starts to cycle the main relay, it could be the voltage regulator overheating. Otherwise you may have to conclude that the ECU is damaged, and it is not worth the time to diagnose which component is faulty.

Thank you,

And you are right too...