[Guest]

I've been having a problem off/on for months now.....I keep getting s**t mileage(19-21 mpg) and a "rotten egg' smell every so often. i figured I'd first try that EGR cleaning from SE-R.net....I then changed-fuel filter, spark plugs, ignition wires, pcv valve and last but not least, O2 sensor. After all that, I still have a "skip' at partial throttle, still enconter that sulfur smell now and again, and even worse, my mileage is still less than 25mpg. Thw wierd thing is, I figured that my catalytic might be shot, but everyplace around here carries either some POS "direct fit replacement"(where it doesn't have the same pipe diameter as stock, even) or it's a weld-on unit, with moi' having to track down a shop that isn't going to charge 245$ for the Catalytic and the welding.(that's the lowest price I've been quoted). The worst part is, a few mechanics I've spoken with on the phone seem to feel that it isn't the 'cat'-they say that Sentra's cats are pretty resilient....I just need to "tune" my engine. WTF!?!? Didn't I just do that with all the other s**t???

 

[redman007]

rotten egg smell.cat is probably getting or is clogged.yes they go bad especially if you add stuff to fuel like injector cleaner. there are some companies that make free flow cats like our but much cheaper than ours. no more than 200 bucks for performance cat and get the flanges welded about the same price you said. or go with illegal 2 1/2" pipe with flanges forthe extra zip! who needs a cat anyway?

 

[redman007]

when they get clogged they get hot ,real hot fix it quick .I remember my cousin driving towards the house saying "my car's on fire" and out I came with the extinguisher and it was the cat in his camaro cherry red and blown up like a balloon. even started burning his inside carpet and the dry leaves on the curb. very scary! who would think?

 

[Guest]

I think the cheapest High flow Bolt -On was a Random technologies cat....But even that was like 200$ or so....I did look into a Test-Pipe, but with emissions laws being what they are here in MA(Cali. emissions standards0 NO ONE wants to make me anything that's even partially questionable-I was just going to "hog-out' the cat, but I figure i'd like to just do this once, instead having to swp things back and forth every year. BTW, I don'tknow how the former owner(s) took care of this car-I know it was repainted, but that's about it. I bought it with 93k and it's got 102k on it now.

 

[redman007]

mine is hogged out but it makes a tinny rotary type sound which i don't like so I'm making my own test pipe 2 1/2" inside dia like the inside of the cat hole.measure cut and buy 2 flanges ,then I'll go to a fence maker and have him weld it for 20 bucks. they weld cheap! then justbolt it on.gaskets, permatex and i'm in there!

 

[Guest]

Yeah, I was thinking about doind that as well, but my Mechanic has it today, and is running a diagnostic on everything...Maybe it's something with the engine tune(running too rich, maybe?)

 

[Guest]

Well.....Got my car back, and was told that there was nothing wrong with it(?). No codes, no smell, no nothin'.....Of course, I just did the EGR cleaning on Sat.; maybe it needs to be run some more? I was also told that if it was the Catalytic, it would stink 24-7, not just off and on. also, the MAF or the MAP might be going bad(or so I was told)-Any thoughts????

 

[redman007]

yeah get a strong air freshener and take the car for some happy revvin'.who knows maybe yougot some road kill up in the fender somewhere hehe

 

[Guest]

You know what redman, that's a great idea!!I've never really "flogged" on this car(I've taken it into the redline I think twice)-Maybe It's time

 

[redman007]

should open her up once in a while to get all the nasty carbon and junk out. it's like us going out for a jog once in a while.

 

[Guest]

You might want to try regrounding your MAF. I have the exact same problem you have (19-21mpg), although not the bad smell.

I haven't gotten around to regrounding it yet, but it's on my list of things to do.

Here are some instuctions:

http://www.se-r.net/engine/maf_ground.html


[This message has been edited by Doug H (edited 01-17-2001).]

 

[Guest]

Well...I hope that it's not like ME going out for a jog...The car would be DEAD!!!

What do you know about the MAP and MAF sensors? Anyone??

 

[Guest]

Doug....i did just that a few months ago right after I bought the car. i went on a lon-distance trip to Boston(110mi. one way from here)and pretty much flogged it....It doesn't seem to be running roughly anymore, but I think somethings up with my fuel guage...(see post)

 

[redman007]

if your maf was messed up you would know buy the car running very crappy. so your good but should still reground it like the ser.net instructions say. don't take to long to do.

 

[Guest]

Somehow, I think that some of the gas they have up here in MA(it has that MTBE crap in it)might have something to do with it....Maybe I should just change plugs while I'm at it.

 

[Jaketips42]

When my classic started bucking and stuff, what I did was disable the EGR. It worked awesome. I took the EGR valve (next to the bpt valve) off. You are going to have make a solid plate out of an aluminum can that will go inbetween the EGR and the intake manifold. It kinda looks like a diamond. Get some posterboard and make two gaskets, one that goes on top of the block off, and one on the bottom. Just make the holes where the studs are in the manifold. In the order of, put gasket on, put aluminum block off, gasket, then EGR. Tighten down and take the car for a spin.

 

[redman007]

good idea. I just bought a bypass cap and capped up the hole where the hose goes in the egr. I like the metal plate idea .now I'm thinking if you get a thick plate then one gasket make two holes then get rid of egr completely to make the engine look better hmm.

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91 SE-R,10:1 comp.pistons,comp.4angle valve job,extrude honed heads/intake manifold,RC TB/MAF,nismo cams,UR pulleys,stillen4-1 ceram.header,nismo/centerforce dual fric.clutch,PR CAI,2 1/2 test pipe,mandrel 2 1/4 superturbo ex.,and a whole bunch of other goodies! boost is in the works ,hell yeah 3:16!

 

[Guest]

or u could get a polished j-spec intake manifold courtesy of my friends at RDC motorsports, no holes 2 patch and it looks great.

 

[Guest]

That's a great idea, but won't that screw up the emissions system itself? I tried just unplugging the egr tubing going down next to the block, and it didn't seem to make any difference.....Maybe I SHOULD remove the whole thing

 

[Guest]

hey chris try se-r.net classified adds, don't remember the company but it's the 1st add on the motors page they have j-spec intake manifolds off of the primera (us g20)it bolts right on and there's no holes