A fuel-injected engine may backfire if an intake leak is present (causing the engine to run lean), or a fuel injection component such as an air-flow sensor is defective. I am going to try setting them all to 1 and see if it will stay at stoich during decel instead of 18:1. Now, after reading that, you're probably thinking that popping on deceleration is a bad thing, and you would be right. But, if it is a rich condition then why is my wideband showing 18:1 on decel. Causes and Cures for Popping on Deceleration. Also, keep in mind that the exhaust header bolts can be loose as well. You can help the bad pop even with a poor map if you increase gasket is bad if the exhaust has ever been removed. However, the most common reason for popping on deceleration is a lean ATF mixture. What is your 'Lambda Reset Switch' (aka LAMSW) parameter set to? A log would be very useful, like to see what the commanded AFR is at decel. General Harley Davidson Chat.
Clean the carb body before you open it up so that no dirt goes into the carb. Track is 7/10 mile sprint track. It's been my experience though that you do NOT want decels to run on the rich side of things. I am also trying to get DFSO to work to solve this, but my first attempt was unsuccessful. The bike will run OK, anywhere between 2. Runs Poorly When Warmed Up. What causes exhaust "popping" during deceleration. A rich tip-in from a slightly lean decel is far more preferable... Somethin'. STEP 5: CHECK YOUR AIR SENSOR. Location: Santa Rosa, California. Sometimes they loosen up over time due to heat cycles and vibration. How do I know if my engine is running lean? Popping on deceleration can be very harmful to your motorcycle, especially long term.
In the case of a slightly rich mixture, you may notice reduced engine efficiency and worse fuel economy, but the rich mixture will generate more power and actually burn cooler. If its too rich it will be black. 25 all the way back. You want it to be in the neighborhood of 0 degrees or possibly even less. It can also be caused by either a lean or rich condition. These conditions can cause trouble down the line, potentially causing knocking or leading to complete engine failure if not resolved. Here's the manufacturer's writeup: They even mentioned "The slight burble produced as you let of the gas is particularly noteworthy". Popping on deceleration lean or rich meal. It could be CO. And finally a loose exhaust flange can cause decal popping. We recently had this issue on an A9L car (89) GT. Some Magnetti Marelli bikes responded by having a -60 put in this column while most Delphi bikes respond by inputting a +25. I have DFSO working on both my A9S and my A9L. I was thinking that it might have something to do with bypassing the PCV, but it shouldn't. Inspect For Exhaust Leak. I would be in 3rd doing 45 and could NOT GET A SINGLE POP, at all!
5:1 piston, a 30/60 cam with 0. Replacement of an excessively restricted air filter. The car pulls great, but when I let off the throttle The car pops pretty loud and even will shoot a little fire out of the muffler. Popping on deceleration lean or rich protein. Popping is a misfire caused by a lean condition. On bikes with EFI, the ECU shuts off fuel delivery immediately when you close the throttle so that no excess fuel can enter the combustion chamber. What air-fuel ratio is too rich?
Quote Link to comment Share on other sites More sharing options... Hate that sound myself, I've seen a lean condition do it back in the carburetor days. Popping on decelleration - Motorcycle Jetting & Fuel Injection. 15, then some points may round up, and others may round down which can alter the shape of the curve. First, let's not forget that once the engine is running lean, it's also running hot and so are the exhaust pipe and the headers. Motorcycle ATV Engine Exhaust Popping or Backfiring - Rich or Lean?
Bike has the stock carb and airbox. 94 GT, CBAZA/J4J1, 347 (on a R302 block), F303 cam, Performer II Intake, 1. Popping on deceleration lean or rich skin. I recently did an overhaul on my carburetor, due to it leaking everywhere and running too big jets (had #165 main jet, and pilot screw (on fuel side) was only screwed out about 1. Loud backfire more than embarassing as it can lead to a split pipe/muffler if severe enough. Does running rich damage engine?
Location: San Francisco East Bay. Not because I thought the DR D was a bad product but because I had got a deal from Yosh on my newer RMZ for pipes and just wanted it to match. My friend says lack of back pressure, but I don't understand how that would cause it, and he couldn't really explain it either. So don't over-compensate. Cracked Vacuum Lines. The best way to check whether the choke is working properly is by removing the carb and inspecting the choke mechanism for binding, as well as inspecting and lubricating the choke cable. Poor idling while cold. This causes an incomplete burn which causes the fumes to explode in the exhaust system along with an audible pop or bang sound. Nick Kowalski is a diesel mechanic by trade, but his passion lies in motorcycles. Does running lean cause backfire? Join Date: Jan 2011. Users browsing this forum: Bing [Bot] and 22 guests. That combustion of unburnt fuel is what causes the popping sounds. The weird thing is that I am still in closed loop during this.
The idle circuit is tuned to provide the right amount of fuel for the air pulled into the engine when it idles at around 1500 RPM. Seems what was once so easy to fix on a older unemission equipped bike has now become a lesson in physics or something I need help on. However, if left untreated for a long time or if the lean condition gets really bad – your motorcycle's engine could face catastrophic failure. You may have to experiment with different jet sizes, but generally one size up will correct the air-fuel mix if you've removed the baffles from your stock exhaust. If you car is running extremely lean, you can sometimes even experience backfires, or popping when decelerating. 0 started making that sound on decel immediately after I installed a high flow cat and a knock off flow master. Backfiring on deceleration due to a lean condition is usually caused by fitting a free flowing exhaust or riding at a lower altitude. Any help would be great, Thanks in advance. Some combustion of unburnt gas in the exhaust is normal and no cause for concern. Another way of doing it is to retard the timing quite far during decel conditions.
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