Triumphrat

sagaris · 09-19-2006, 11:36 AM

I bought a new 05 Daytona in March 06. After the 600mi service, it developed a check engine light problem. The CEL will come on independent of temperature (water/oil/ambient), weather, fuel level, and harshness of riding. The CEL will stay on for 50mi then turn off, usually before three heat cycles. Sometimes the low fuel light comes on too, sometimes not.

It has been into the shop three times already and they haven't found any codes stored. This last time they replaced the fuel pump, and the problem remains only now I get 30mpg (down from 42mpg).

Any ideas?

bradtx · 09-20-2006, 01:09 PM

sagaris, Your bike is way too rich. If the original CEL cause was cured by the fuel pump change, you've a new one possibly related, but not the cause, to the O2 sensor.

Make your dealer fix it.

Brad

sagaris · 09-20-2006, 04:34 PM

The new fuel pump did not cure the original CEL issue. With the new pump, it also got new injectors and fuel lines, but not an O2 sensor. Does this point to the O2 sensor as a probable cause?

Also, if the mix is too rich is there a way to balance it? (i.e. remapping, perf air filter, etc)

Thanks for the help!

vinnyf · 09-20-2006, 10:47 PM

Sorry about your problem, Sagaris - these intermittent situations will drive both owners and service departments totally nuts.

But you mention that sometimes the CEL will come on along with the LOW FUEL light. Do you mean REALLY at the same time, or one is lit, and a few miles later, the other is lit?

From the fact that no service codes are being stored, it would seem to me that there are 2 possibilities -

1) the error light (and/or the low fuel light) circuit is in trouble with possibly a frayed or corroded connection, or
2) the management computer is not working properly.

I know that both of these are often blamed, and usually they are not the cause, but you know what Sherlock says, when you've eliminated the impossible, that which remains...

BTW, why did they replace all that fuel system stuff? were they just taking a wild guess, or was there some basis for spending a bunch of Bloor's cash? :razz:

Good luck, and please keep us posted..

sagaris · 09-21-2006, 06:49 AM

When the fuel light comes on, it is at exactly the same time as the CEL. However, sometimes the CEL lights and fuel does not.

The dealer replaced the fuel pump because they thought the mix was too lean. The replacement pump is an older model with two fuel rails (apparently, 05 and up have a pump with one fuel rail).

She's going in one last time on Friday. If they can't fix it, I'll make lemonade and get another

I'll keep you guys posted, thanks again!

TechmanBD · 09-21-2006, 10:34 AM

Sory to hear the troubles. Good luck, hope things go well for you.

vinnyf · 09-23-2006, 12:41 AM

From what you're reporting on timing of the two lights, I'm going to stay with my original thoughts - either a bad connection in the indicator circuits or a bad ECU. Sure sounds as though the fuel pump replacement was a WAG (wild ass guess), and probably a move in the wrong direction.

Yes, I would love to hear what they finally determine. Good luck,
vinny

sagaris · 10-05-2006, 04:56 PM

The latest word is a broken fuel level sensor. Hopefully this is the root cause. I'm picking it up this weekend. I'll keep you guys posted, thanks again for all the help!

93-Daytona · 10-29-2006, 01:36 AM

Bit late posting this but may be of interest.
I doubt that the fuel level sensor is the cause as the MIL warning light comes on. No fault code has been logged either, code is P0462 for low input to the sensor and P0463 for high output. The ECU is NOT designed to illuminate with this fault. The DTC is erased after 40 no-fault cycles.
However, a fuel pump relay fault may have occurred and is not uncommon.
The MIL will remain on for 3 no-fault cycles, ie; engine started from cold and run to at least 72degrees celcius.
After 40 no-fault cycles the DTC's are removed from the ECU memory.
The big issue now is the overfuelling. The Lambda (O2) sensor may also be at fault, as the MIL will illuminate if any of 7 faults occur in the O2 circuit.
Funny though how the ECU has not logged the DTC code.
Unlikely that you would have started and stopped the bike 40 times between faults while getting your ECU checked during visits to the dealer!
I use a TuneBoy on all models and the DTC codes, if any, have always been present.
Although the non-return type fuel pump has been fitted the operating pressure is the same.
Let us know how things turn out
Cheers

sagaris · 10-29-2006, 10:24 AM

93-Daytona-
Interesting note about the MIL fault codes. I don't own a Tuneboy, so I'm at the mercy of the dealer whether or not these codes were present. And I certainly didn't wait until after 40 cycles had passed to have it inspected.
At any rate, the dealer replaced the fuel pump, fuel level sensor, and uprated all of the grounding strips which fixed the problem.
Where did you buy your Tuneboy? Thanks again for the info!

[ This message was edited by: sagaris on 2006-10-29 08:25 ]