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Car Forum / Nissan / Nissan Maxima / January 2008Maxima 2000: can new muffler cut MPG by 3-4??
A couple months ago, my 2000 Maxima with 68,000 miles start making terrible clunking noises from the muffler area. My head wasn't on straight that day and I took it over to Meineke. A pipe was rusted out and hanging...they said even though the original stainless steel muffler was fine, they had to replace the muffler to replace the connecting pipe. I said "fine". I know...dumb move in hindsight and I wish I would have taken it elsewhere. Well the Meineke muffler was $220 or something like that and looks/works fine. However I swear I get 3-4 MPG less than I used to. Possible? I also got the MAF sensor replaced in the same time period... > A couple months ago, my 2000 Maxima with 68,000 miles start making > terrible clunking noises from the muffler area. [quoted text clipped - 11 lines] > However I swear I get 3-4 MPG less than I used to. Possible? I also got > the MAF sensor replaced in the same time period... The muffler should have little/nothing to do with fuel economy. The MAF however can have a major impact. Look to the MAF if you see statistically significant change in mpg. >> A couple months ago, my 2000 Maxima with 68,000 miles start making >> terrible clunking noises from the muffler area. [quoted text clipped - 15 lines] >MAF however can have a major impact. Look to the MAF if you see >statistically significant change in mpg. Not possible. Also the Maxima has an all St Stl exhaust system - you should be contacting your local BBB if Mienake replaced something "rusted". A bracket may have broken/corroded, but not a pipe in the exhaust sytem. > Not possible. > > Also the Maxima has an all St Stl exhaust system - you should be > contacting your local BBB if Mienake replaced something "rusted". A > bracket may have broken/corroded, but not a pipe in the exhaust sytem. A bracket was indeed broken/corroded. He made the claim that the broken bracket somehow caused the pipe to be unusable. At the time I was stressed about other things in my life and didn't think. This was a couple months ago...I doubt I can go back and get any compensation. I spent ~ 330 for the new muffler and service work >> Not possible. >> [quoted text clipped - 9 lines] >This was a couple months ago...I doubt I can go back and get any >compensation. I spent ~ 330 for the new muffler and service work the brackets are not Stainless Steel - you didn't say it was a bracket in your original post. > Not possible. Also what is not possible? The MAF affecting MPG or the exhaust affecting MPG? >> Not possible. > > Also what is not possible? The MAF affecting MPG or the exhaust > affecting MPG? You are replying to the class clown. His dad owns a Nissan dealership and he figures that gives him a clue. Some good info here: http://forums.maxima.org/ >>> Not possible. >> [quoted text clipped - 5 lines] > >Some good info here: http://forums.maxima.org/ Must be a sad life - just sitting around stalking an obscure news group - making none sense posts. > Must be a sad life - just sitting around stalking an obscure news > group - making none sense posts. That's what I figured. When are you going to stop it? Strange you didn't tell him it was because he didn't run premium. >> Not possible. > >Also what is not possible? The MAF affecting MPG or the exhaust affecting >MPG? the exhaust,,the MAF definitely could. On Jan 2, 12:20 pm, pgg <papaNO_SP_AMgordygra...@yahoo.com> wrote: > A couple months ago, my 2000 Maxima with 68,000 miles start making > terrible clunking noises from the muffler area. [quoted text clipped - 12 lines] > However I swear I get 3-4 MPG less than I used to. Possible? I also got > the MAF sensor replaced in the same time period... The muffler should have little/nothing to do with fuel economy. The MAF however can have a major impact. Look to the MAF if you see statistically significant change in mpg. What/where is a maf sensor? I own a 95 max that has poor fuel economy. Did reg. tune up A muffler with the wrong size (capacity) or wrong diameter pipe will affect more than fuel consumption, can even lead to engine overheating, poor performance, etc. Remember that for some engine conditions require back pressure in the exhaust pipe and others require free flow. > A couple months ago, my 2000 Maxima with 68,000 miles start making > terrible clunking noises from the muffler area. [quoted text clipped - 11 lines] > However I swear I get 3-4 MPG less than I used to. Possible? I also got > the MAF sensor replaced in the same time period... You do bring up a point I had thought about and disregarded. An overly restrictive muffler or some other clog could definitely reduce power. But you will feel the loss in power, probably well before you see a change in fuel economy. The OP described loss in fuel economy only. As for too little restriction, these cars don't have issues (aside from emissions legality and sound level) when running straight pipe exhausts. I believe the too little restriction thing is largely a myth, in fact. Dave > A muffler with the wrong size (capacity) or wrong diameter pipe will > affect more than fuel consumption, can even lead to engine overheating, [quoted text clipped - 20 lines] > > - Show quoted text - There are systems that actually control the flow of gases in the muffler to get the needed backpressure for some operating conditions. Not in the 2000 Maxima, that i know of. > You do bring up a point I had thought about and disregarded. > [quoted text clipped - 34 lines] >> >>- Show quoted text - > There are systems that actually control the flow of gases in the muffler > to get the needed backpressure for some operating conditions. Not in [quoted text clipped - 43 lines] >>> >>> - Show quoted text - Yes, the 2000 thru 2002 Maxima have variable mufflers that "open up" at higher RPMs. My guess is it's the MAF change and the computer is still adjusting to it. CD Thanks for the enlightenment >> There are systems that actually control the flow of gases in the >> muffler to get the needed backpressure for some operating conditions. [quoted text clipped - 50 lines] > > CD To the OP, no. A new muffler/pipe, even is sized extremely small or large, will not cause a 3-4 MPG change in fuel economy in a car that gets 19-24 MPG. This is way too large a change for such a swap. There are certain years of Max that have a stock muffler (stamped "Calsonic" on my car) which has a flap that opens at 2,000 RPM or so. I have seen this replaced on several Maximas with an open-style muffler with no perceptible changes. Look elsewhere in the car for your fuel economy issues. BTW, fuel economy numbers are very erratic in the short term. Try to average economy over multiple tanks to get a better MPG number. This will even out any variations such as: batches of bad gas you might have gotten, incorrect pump meters, city driving vs highway, ambient temperature, etc. All of which can really vary your mileage. > A couple months ago, my 2000 Maxima with 68,000 miles start making > terrible clunking noises from the muffler area. [quoted text clipped - 11 lines] > However I swear I get 3-4 MPG less than I used to. Possible? I also got > the MAF sensor replaced in the same time period... A MAF sensor replaced, for a good one I assume, should only *improve* mileage from a deficient number to the normal number. What mileage do you get, exactly? A MAF bad enough to chop 3-4 MPG ought to throw a check engine light.  SignatureOil is always 15 years from running out, the oceans are always 10 years away from rising 10 feet, and the internet always has only 3 years left before it runs out of capacity. Color me skeptical. No one has ask if the ECM was reprogramed when the MAF was changed. Apparently the dealer needs to reprogram the ECM to match the MAF used. Makes sense but MAFs in these cars really can cuase havick with runability and a code that is thrown never indicates its the MAF. If your still low on MPG give it a shot. -- Message posted using http://www.talkaboutautos.com/group/alt.autos.nissan.maxima/ More information at http://www.talkaboutautos.com/faq.html |
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