Loss of throttle response

ph001 · Post by **ph001** » Thu Mar 08, 2018 6:14 pm

Scooba_Steve wrote: ↑Thu Mar 08, 2018 5:22 pm Mine was a hesitation but just throwing it out there. In normal operation the throttle is fully open with power controlled by lift and timing.

No worries...all ideas are worth airing. It's only the N52 that has valvetronic - the OP has an M54 which is your more typical throttle flap.

Scooba_Steve · Post by **Scooba_Steve** » Thu Mar 08, 2018 6:19 pm

Didn't spot that! My bad, yes only the N52 has valvetronic. Still worth a shot if the throttle checks out ok, mine was only for about a second but was always at the same speed and throttle setting, codes did indicate a sticking solenoid though but didn't show EML.

John223 · Post by **John223** » Thu Mar 08, 2018 7:57 pm

ph001 wrote: ↑Thu Mar 08, 2018 5:08 pm Yeh, I don't think the OP would describe this as a hesitation at all. It's literally seconds of no throttle response whatsoever. Has to be lack of throttle actuator operation for one reason or another (I would place a very small bet on non-correlation of throttle pots on pedal).

If it would only happen in another gear, it would be pretty conclusive. Unfortunately 90% of the time I'm commuting at 55+ in 5th. When I get back from a company trip, I'll try to spend more time in 4th at around the same magic rpm point to see if I can coax it to happen. In the mean time I may try to buy the software to try to find if there is a intermittent dead spot on one of the pots. I assume I should be able to read the pot signals with the BCable software.

ph001 · Post by **ph001** » Thu Mar 08, 2018 8:27 pm

Yep, you can do that with INPA.

Piper1 · Post by **Piper1** » Thu Mar 08, 2018 8:46 pm

If it’s the actuator pedal module that I see here https://www.fcpeuro.com/products/merced ... 5426852644 would there be any type of programing like with getting a new throttle body?

ph001 · Post by **ph001** » Thu Mar 08, 2018 9:05 pm

Throttle adaptation reset should be all that is required

Piper1 · Post by **Piper1** » Thu Apr 12, 2018 3:15 pm

Just found this: https://www.pelicanparts.com/techarticl ... cement.htm

It was an interesting point at the bottom saying give it time for electronics to acclimate at idle or there’ll be a flat spot. My pedal looks like it might have been replaced prior to me owning it since the cover plug on the hold down bolt never was there. I have a new pedal to put in this weekend so I’ll let you know the outcome. I replaced the upper intake solenoid and it’s still doing what it has been so wasn’t that still have to do the lower solenoid just didn’t have time when I did the upper with juggling the kiddo around.

Nelly Welly · Post by **Nelly Welly** » Fri Apr 13, 2018 3:46 pm

This can occur after periods of constant speed if one of the tracks on the pedal actuator have a loss of signal due to dirt or wear, only once the system can verify the actuator position for both tracks (one the resistance increases the other it decreases)will it recover the signal and allow the ecu to know if the pedal is being depressed or released.

It can potentially get worse although once it becomes persistent it will give a fault code. and the engine will not respond at all.

Piper1 · Post by **Piper1** » Wed Apr 25, 2018 1:29 am

OP have you had any luck yet? Took mine out of hibernation third day did it 3 times on the way home so I changed my pedal out and hasn’t done it for a week after so far.

ph001 · Post by **ph001** » Wed Apr 25, 2018 7:21 am

Did you do a throttle adaptation reset?

Piper1 · Post by **Piper1** » Wed Apr 25, 2018 3:28 pm

I did when installing the new pedal. It still happened on the old pedal after the reset but with always driving in sport mode there was more going on then the throttle adaption doing its thing.

ph001 · Post by **ph001** » Wed Apr 25, 2018 4:37 pm

Do you have INPA? You can do a real time live data on the pot values with the pedal just with ignition on.

Piper1 · Post by **Piper1** » Thu Apr 26, 2018 7:23 pm

ph001 wrote: ↑Wed Apr 25, 2018 4:37 pm Do you have INPA? You can do a real time live data on the pot values with the pedal just with ignition on.

I have a Peake and the diagnostic software from ess that came with the vt kit. Still no codes showing. As an update it did it on the way in today so pedals not the problem. I noticed when it happened was when I was coasting in 5th going 70 slightly lifted foot and when I went to pressed on the throttle again it was like in a dead zone of acceleration. Down shifting revs went higher still no response and as I’m oscillating the throttle my boost gauge is going with my foot will go from vac -18 down to -2.3 but not to positive boost at all. The whole thing lasts a couple of seconds then back to normal.

Without codes now I’m at a loss. Think a possible sticky icv, or fuel pump/filter? I replaced the Disa about 20k ago when I first started noticing the problem when it was n/a so been happening pre f/i

Scooba_Steve · Post by **Scooba_Steve** » Thu Apr 26, 2018 9:26 pm

This is the first time you mention ESS fitted in the thread?

Piper1 · Post by **Piper1** » Thu Apr 26, 2018 9:45 pm

Scooba_Steve wrote: ↑Thu Apr 26, 2018 9:26 pm This is the first time you mention ESS fitted in the thread?

Ah well I had a thread a while back on it in the discussion part

but since this started occurring least for me to take notice 20k or so on the clock before ess, was ruling any of the kit out.

This was my original thread when I first took notice of it then totally forgot about it till th op in this thread revived it
viewtopic.php?f=3&t=52371&p=762876#p762876

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