I have an 01' S4 with the Termi's and ECU, bought used. I keep getting a little backfire every so often, and when I throttle at a light, I hear a "pop" in the throttle buddy under the tank. Just kinda worries me if the bikes running to lean or rich. I just had the belts serviced, new chain. But haven't had the valves adjusted, which I like to learn to do myself. Just trying to figure out what this issue is first.
I had this problem with my arrows so here a list of possibilities that you should look thru. If you do it in this order you'll avoid unnecessary servicing.
1) First identify whether you're running rich or lean
a) Does your exhaust smell like gas? If so, you might running rich.
b) When you flog your throttle does it lag/lurch before the power comes on? If so, you're probably running lean
2) Check for exhaust leaks - DP ECU's(and most power commander maps) tend to richen the mixture. An exhaust leak at low throttle will many times can cause an inrush of air into the exhaust. This results combustion of the unburn fuel. Check for leaks by feeling around the slip fit connections. These are usually the culprit. From first hand experience the horizontal cylinder tends to run richer. I've noticed in the past that exhaust leaks contribute to a majority of excessive popping and backfiring situations.
3) Clean your air filter. You want to make sure you're engine breathes properly
4) Valve adjust/ Sync throttle bodies / reset TPS - A valve adjust should be your last resort as this is generally and expensive procedure. But hey, sometimes thats what it takes. Just dont jump to this right away.
Thanks for the quick reply. I will try those. One thing that worries me, I was unloading the bike, it fell over with me, and dented the bottom of my right Termi can, busted the riveted ring loose, looks cosmetic, but hoping the can is not damaged and leaking. I've only had the bike a short while, so I can determine if this was an existing issue.
+1 on the exhaust leak, I had the exact same symptoms you described after I installed the Termi ECU/airbox. One of the exhaust clamps was loose, after I tightened it no more coughing.
OK so yes, I am about to ask a noob (mechanically) AND chic question, but bare with me here please:
Installed Leo Vince slip ons....told no need for re-tune with these. I DO get an occasional pop on deceleration, but (wait for it) I LIKE this. So, this is a "bad" thing perhaps??
I am coming up fast on the 7500 mile service for my '09 696 tho-is there a problem waiting til then for any issues?
Also, trying to find thread/link that tells me exactly what all needs done at this service.
Thanks all for putting up with me here. [beer]
Quote from: NekkedChic on March 31, 2009, 05:23:45 AM
OK so yes, I am about to ask a noob (mechanically) AND chic question, but bare with me here please:
Installed Leo Vince slip ons....told no need for re-tune with these. I DO get an occasional pop on deceleration, but (wait for it) I LIKE this. So, this is a "bad" thing perhaps??
I am coming up fast on the 7500 mile service for my '09 696 tho-is there a problem waiting til then for any issues?
Also, trying to find thread/link that tells me exactly what all needs done at this service.
Thanks all for putting up with me here. [beer]
That popping is probably as described above - the result of a small leak in your exhaust. One of the joins where your new slip ons meets the headers has probably worked a bit loose since the install. IF that's the case it's not a huge deal. It's not good, since it's not supposed to run like that.. but you're not in immanent danger of you bike blowing up. There's probably no problem waiting until your service - but really there's no need. All you probably need to do is loosen the cans, give them a wiggle to make sure they are snugly mated to the headers and then re tighten anything you loosened.
Your owners manual will tell you what needs to be done and any given service. IF you don't have yours - Duc puts them on line
http://www.ducati.com/en/bikes/service/manuals/2008.jhtml?family=manuals (http://www.ducati.com/en/bikes/service/manuals/2008.jhtml?family=manuals)
Quote from: yuu on March 31, 2009, 06:17:53 AM
That popping is probably as described above - the result of a small leak in your exhaust. One of the joins where your new slip ons meets the headers has probably worked a bit loose since the install. IF that's the case it's not a huge deal. It's not good, since it's not supposed to run like that.. but you're not in immanent danger of you bike blowing up. There's probably no problem waiting until your service - but really there's no need. All you probably need to do is loosen the cans, give them a wiggle to make sure they are snugly mated to the headers and then re tighten anything you loosened.
Your owners manual will tell you what needs to be done and any given service. IF you don't have yours - Duc puts them on line
http://www.ducati.com/en/bikes/service/manuals/2008.jhtml?family=manuals (http://www.ducati.com/en/bikes/service/manuals/2008.jhtml?family=manuals)
Thank you so much for the info and links [bow_down]
I will get my SO on the tightening job, as he is the "installer" [laugh]
Quote from: NekkedChic on March 31, 2009, 05:21:56 PM
Thank you so much for the info and links [bow_down]
I will get my SO on the tightening job, as he is the "installer" [laugh]
Oooooh...
If that ends up being the case, jar-opening jokes are necessary.
Spoke with the dealer here in Nashville that did the chain and belts. He says it needs to be hooked up to the CO machine. That the bike is probably at about 6%, needs to be blowing about 3%. Going by the symptoms I described to him.
The other exhaust fittings to check are where the headers bolt into the engine....that solved a similar problem I had [thumbsup]
I got to thinking, I just got back in from the Gulf, took a ride and noticed the air box is not as throaty as usual. Makes me wonder if the plug is fouled. I cranked it up last night, got a loud backfire pop, same usual heavy gas smell from the exhaust. I plan to take it to the shop Saturday. But seems if the previous owner spent all the money on the Termi setup, he would have had the ECU calibrated as well. Hate to spend the money if it's just the plug which I can replace. Any thoughts on this? It's been so beautiful here, I've wanted to ride, but the Duc is running like crap, so kinda takes the joy out of the ride.
So you checked for the exhaust leak? There wasnt one?
None I could see, I tightened all the bolts. I can recheck. It did fine on my recent trip till I got here, and then the problem began. It's irking me, tonight's the Music City Desmo Owners Club meet up, and my bike is sick, so I'm missing out again.
Called the shop to schedule my appointment, said it would be Thursday/Friday before it's done, and he's not so sure that the CO/enrichment may be the issue. This is the shop manager, I had originally talked with the head mechanic. Where is the spark plug located, and what socket/tool will I need? I hate to be without my bike that long, the days have been gorgeous. What else am I missing here? The damn thing was purring till the day after my trip up here. I wondered if it may be ethanol since most gas stations are now including it. I'd love to give this a shot myself. With it being fuel injected, what adjustments can I make?
Quote from: fouramdesigns on April 24, 2009, 03:33:46 PM
Called the shop to schedule my appointment, said it would be Thursday/Friday before it's done, and he's not so sure that the CO/enrichment may be the issue. This is the shop manager, I had originally talked with the head mechanic. Where is the spark plug located, and what socket/tool will I need? I hate to be without my bike that long, the days have been gorgeous. What else am I missing here? The damn thing was purring till the day after my trip up here. I wondered if it may be ethanol since most gas stations are now including it. I'd love to give this a shot myself. With it being fuel injected, what adjustments can I make?
The spark plugs are located in the top of the cylinder heads. On the S4 models, the coil plugs directly onto the spark plug. You'll need a long extension to reach down into the spark plug hole.
Being fuel injected, there isn't much you can do to it other than look for exhaust/intake leaks and other reasons why it would have suddenly changed mixture/tuning.
Hey,
Got a M620D, opentop air filter, Hi mount Termis.... Couple of miles into 'inaugural' ride, let throttle go to slow down "POP POP POPPUM"...for behind and from inside airbox, this was Saturday afternoon, so had to wait till Monday...Got to shop on Monday, DSS hooked, Trim showed 20, Saturday it had shown 24...so up it was...two weeks later, the same, using 95oct gas, [bang] [coffee] will waiting, mechanic too small to ride, so I have to test ride....20mins later, all OK...Stop bike for more than 5 days[due to weather or health], starts doing it again...trim goes down by itself... [evil] Bike has a mind of its own...But it has lots of [bacon] that after ridin for a full morning, makes me come home and [drink] a cold one while I wash, with lots of detail my baby. [wine]
Carlos, are you drinking a cold one now buddy, as you type this? Cause I could only pull a bit, albeit a VERY small bit from your post. [laugh]
Quote from: fouramdesigns on April 27, 2009, 02:02:49 PM
Carlos, are you drinking a cold one now buddy, as you type this? Cause I could only pull a bit, albeit a VERY small bit from your post. [laugh]
Do I need a cold one now?.YES!!!!!!!! Temp is 95F with humidity at 98%....
What I was trying to say was: had hierf filter and Termi exhaust installed, DSS hooked up, everything check OK, Later that afternoon, bout 100miles into the ride, POP POP POPPUM while coming to a stop...Back to the shop, TRIM adjustd back to 24[as it was on Sat], it showed it was on 20...
This happens so often, that when Italian [moto] Doctor came for 'free' clinic, he was ??? ??? ??? is this happening. I just try lo live with it...and if takes to much of my bike, I ride to the shop, adjust trim and ride away at no costo... [clap] [wine]
Ah, now I get it, slightly better.lol
Ok, bike checked out fine, was a fuel mixture issue, CO corrected that. An the chain was loose since it was just replaced, they say she's running like fire. So ready to pick it up.
Quote from: fouramdesigns on April 30, 2009, 08:56:33 AM
Ah, now I get it, slightly better.lol
Ok, bike checked out fine, was a fuel mixture issue, CO corrected that. An the chain was loose since it was just replaced, they say she's running like fire. So ready to pick it up.
Chain was not loose, the trim[at least that's what's called in the DSS] was of spec, too low, but yes, fuel issue. Now she's not running at all, go to my flckr site and see pics of accident... :'( :(
Bike is running lean again, power is almost nothing, pulled very sluggish this morning on the freeway. Just had the CO/throttle bodies synched a few weeks back. I'm ordering the correct iridium plugs today to see if that helps any. Also I ran out of fuel on Friday in hurry to get home to leave for the beach, any chance this could cause another CO issue? I think in this or one of the other related post someone mentioned a water sensor etc that could be causing the CO to keep changing.
Update:
Noticed on the ride home, the bike is lurching. In the first 3 gears, and between 3K-6K RPM's, it sputters. The sound of the exhaust has changed, as well as the sound of the short box/throttle bodies. Almost no pick up or power. This thing is sick, sick. Any ideas?
I'd say swap out the fuel filter.
Also, a possibility that the pressurized fuel lines in the tank are going bad.
I've seen both issues cause weird behavior like that.
Quote from: Speeddog on May 27, 2009, 05:31:20 PM
I'd say swap out the fuel filter.
Also, a possibility that the pressurized fuel lines in the tank are going bad.
I've seen both issues cause weird behavior like that.
Thanks for the reply as always. Are the pressurized lines replaceable? I assume that they are.
Yep, they're what appears to be regular fuel line.
Starting the work today, about to pump the tank and pull what I can. You've been a big help as with the others. I called the original Duc shop I've been using to get a few parts, mentioned the board and all the help, guy caught a tude like I was an idiot for getting help via the net. Had him transfer me to the Service, told the manager that the CO/ful issue has crept back up, "man, there's something wrong with that bike, how do you know it's the CO again?" I told him same symptoms as before. I've spent almost $1500 with this dealer, and thy treat my like a second class citizen. I'm sorry I can't afford to buy a new Duc at the moment. I have an appointment scheduled with Corse Motorsports in a few weeks, Alain the owner, was in a very bad wreck with his wife, so he's out indefinitely, so I'm doing what I can at the moment till I can get the bike to his shop. You know, I've been in sales 14 years, and I treat the small sales just like the big sales, one reason I've been so successful. Blows my mind how this other shop can just blow me off like I'm some homeless bum pest. I've been nothing but courteous and patient. Anyway, thank you for all of your help, I'll be asking for more as I go along. Wish me luck....
Spencer
Quote from: fouramdesigns on May 27, 2009, 04:52:58 PM
lurching first 3 gears between 3K-6K RPM's, it sputters. The sound of the exhaust has changed Almost no pick up or power
Mine has had this same issue since new.... ??? [bang] ??? [bang] ??? [bang]??? [bang] ??? [bang] ??? [bang]??? [bang]??? [bang] ??? ...
Any suggestions? Wty expired last year on June 24th
Now [drink] ...