Excellent backfiring and popping

**mashman** · 11th May 2012, 21:25

... but it only started today and me thinketh something ain't quite right. Not that the Prila is running rough, but she's certainly not smooth and almost feels like she wants to stall at low revs (missing perhaps?). Rolling off the throttle she's popping something chronic, lervely sound, but hmmmmm, that can't be right. The battery is lowish (I hope the stator ain't gone pop again) and I'll charge it tomorrow, I'll check the plugs aren't loose and I'll check the vacuum hoses for holes... is there anything else you can think of that I should be checking?

Cheers

**unstuck** · 11th May 2012, 21:27

Originally Posted by mashman

... but it only started today and me thinketh something ain't quite right. Not that the Prila is running rough, but she's certainly not smooth and almost feels like she wants to stall at low revs (missing perhaps?). Rolling off the throttle she's popping something chronic, lervely sound, but hmmmmm, that can't be right. The battery is lowish (I hope the stator ain't gone pop again) and I'll charge it tomorrow, I'll check the plugs aren't loose and I'll check the vacuum hoses for holes... is there anything else you can think of that I should be checking?

Cheers

Clean the points.

**bogan** · 11th May 2012, 21:31

How do they deal with leaning out under decel? Could be a vac sensor not telling the ECU to put a bit more fuel in, or if carbed, an air cutoff valve malfunction. Vac leak check is a god first plan though.

**mashman** · 11th May 2012, 21:39

Originally Posted by unstuck

Clean the points.

She doesn't run on tracks

Originally Posted by bogan

How do they deal with leaning out under decel? Could be a vac sensor not telling the ECU to put a bit more fuel in, or if carbed, an air cutoff valve malfunction. Vac leak check is a god first plan though.

Pfffft, leaning out under decel, sounds like cornering to me

. Will check the vac lines too, although not sure how to do that, will google and see iffen I can do it. Cheers

**mossy1200** · 11th May 2012, 22:38

Originally Posted by mashman

She doesn't run on tracks

Pfffft, leaning out under decel, sounds like cornering to me

. Will check the vac lines too, although not sure how to do that, will google and see iffen I can do it. Cheers

MT01 does it alot with the aftermarket cans.

**slofox** · 12th May 2012, 17:11

Originally Posted by bogan

How do they deal with leaning out under decel? Could be a vac sensor not telling the ECU to put a bit more fuel in, or if carbed, an air cutoff valve malfunction. Vac leak check is a god first plan though.

Wot 'e said. Air leak somewhere would be my thought too.

**Akzle** · 12th May 2012, 18:19

spark plugs all conectered? HT leads all OK?
popping= fuel burning in the muffler, not the cylinder?

thems the first things pops into my head when i readed that.

**mashman** · 12th May 2012, 19:00

Cheers for the suggestions... I'm thinking battery though. The Prila does seem to love to kill them. I charged the battery to 14.16v, just had a cig in the garage and measured again, 13.36 and falling. It's not connected and it isn't holding a charge. Kinda disappointing as it's an AGM battery and the last battery that was killded by the Prila turned it into Perry the Platypus...

Not ruling out that there isn't another problem, but 2 batteries dead, hmmmmm. What kills battery's? (according to Mrs M it's luggin a fat bastards arse around, biotch) Fuck I hope I don't have to replace another stator too.

**rustyrobot** · 12th May 2012, 19:28

Heya, came across this thread when I was searching on the AF1 forums for my own battery problems. Could be related?

http://www.apriliaforum.com/forums/s...dure-Must-read

Many here have reported dead batteries shortly after replacing with a new one.

Also, to prevent resetting the odometer to zero, make sure you remove the key from the ign before disconnecting the batt.
Aprilia has recently released a troubleshooting guide with detailed explanations and fixes for issues that over the years have been reported by the dealers thru warranty claims.

The following is a copy/paste verbatim from that guide:

INTRODUCTION:
The following procedure must be performed when refitting the battery onto a vehicle with the MARELLI instrument panel (identifiable by the + and - buttons to the left of the display). This procedure is necessary to prevent the instrument panel from remaining in the "awaiting memorisation of 2nd key", causing it to consume 20 times more current than normal.
The problem is caused by the instrument self-resetting and then waiting for a key memorisation procedure (even if it has already been performed), remaining in standby mode with this function still active. The resulting high current consumption will drain the battery completely within 3 or 4 days if the vehicle is not used.

PROCEDURE:
After disconnecting the poles of a battery on an RSV 1000 V2 with Marelli instrument panel, after reconnecting, perform a key-on, wait at least 15 seconds without starting the engine then switch the ignition off.

For more precise testing, connect a multimeter set to current measurement to the battery poles: at key-on, current consumption drops from 45 milliamps to 1-2 milliamps after approximately 15 seconds.
Obviously, when the multimeter is disconnected, it is as if the battery poles were disconnected again, so the aforementioned procedure must be repeated without the multimeter.

**mashman** · 12th May 2012, 20:09

Originally Posted by rustyrobot

Heya, came across this thread when I was searching on the AF1 forums for my own battery problems. Could be related?

http://www.apriliaforum.com/forums/s...dure-Must-read

Cheer Rusty... t'has been a while since I've been on AF1. Can't believe it took them 6 years to figure this crap out. It could explain the false starts when cold... will remember to do it when we goes a testing tomorrow, should the battery still have a decent charge that is.

**ducatilover** · 12th May 2012, 20:37

If your battery isn't holding charge then...it might pay to sort that.
It's injected isn't it? If so, an intake leak would cause the idle to hunt up/down and so would a rooted oxy sensor (in theory) but if you've got a loose header pipe or something of the sort you may get too much O2 to the oxy sensor, or the gas flow will root everything.

I'd be putting $$ on your low battery voltage though.
Have you got a Multimeter? If so, check the charge rate and check for current drop when the ignition's off.

If you get stuck, feel free to bring it up to me...

**tigertim20** · 12th May 2012, 21:01

Originally Posted by mashman

Cheers for the suggestions... I'm thinking battery though. The Prila does seem to love to kill them. I charged the battery to 14.16v, just had a cig in the garage and measured again, 13.36 and falling. It's not connected and it isn't holding a charge. Kinda disappointing as it's an AGM battery and the last battery that was killded by the Prila turned it into Perry the Platypus...

Not ruling out that there isn't another problem, but 2 batteries dead, hmmmmm. What kills battery's? (according to Mrs M it's luggin a fat bastards arse around, biotch) Fuck I hope I don't have to replace another stator too.

look to fix the cause, not just the symptoms. going through batteries fast? check your stator output, and check how much power the regulator is sending to the battery when running, and across a range of RPM.

**mashman** · 12th May 2012, 21:19

Originally Posted by ducatilover

If your battery isn't holding charge then...it might pay to sort that.
It's injected isn't it? If so, an intake leak would cause the idle to hunt up/down and so would a rooted oxy sensor (in theory) but if you've got a loose header pipe or something of the sort you may get too much O2 to the oxy sensor, or the gas flow will root everything.

I'd be putting $$ on your low battery voltage though.
Have you got a Multimeter? If so, check the charge rate and check for current drop when the ignition's off.

If you get stuck, feel free to bring it up to me...

I haven't connected the battery since the charge and it's initial reading was 14.16. Now down at 13.08.

Iffen I get annoyed with it I'll bring it up for wheely practice

Originally Posted by tigertim20

look to fix the cause, not just the symptoms. going through batteries fast? check your stator output, and check how much power the regulator is sending to the battery when running, and across a range of RPM.

I thought I had. The RR was suspect on these models and I've performed the mod (removed, rewired, relocated) and have the mosfet RR that folk are recommending. I'm kinda stuck in regards to what the problem might be. I'll have a pop at checking the stator tomorrow, been postponing that little treat, but know how to do it and what the voltages should be, just really really don't want to have to fanny around with the stator again as it is a known issue on some of the RSVR's.