Quick question has anyone smogged with the the skunk2 mani, i keep failing and the only reason i can figure is the mani cause everything else is pretty much stock except i have a cone filter on the stock intake. i cant pass the 15mph pull the guy says im running too rich does that make sense in respects to the manifold? Is the Jdm gsr intake manifold the same as the Us one? from what i can tell it is thanks in advanced.

 

sounds like thats the culprit.. any CEL? i would suspect it could be a bad 02 sensor but usually it throws a cel if its bad...do you have your stock mani? im not sure if the jdm is the same as usdm, but i would say throw your old one on until you pass inspection

 

thanks for the reply, i just bought the car and when i couldnt pass smog i replaced the cat and o2 sensor. But i still failed so the only thing left is the intake manifold, the reason i ask if the jdm gsr manifold is the same as the usdm is because i have access to the jdm one.

 

what ecu are you running? you aren't doing something crazy like using a stock p72 are you? the p72 will have more fuel and less timing down there due to the smaller runners via closed butterflys. if you could borrow a type r p73 i bet you would pass. in fact, if you are going to run a single runner intake you need a chipped ecu if you want flexability or a p73 if you're staying NA and not going past stage 1-ish cams. what year GSR do you have?

 

pretty sure i have the stock ecu, and i have a 94 gsr

 

you have obd1, talk to the guys who do tuning. i can't remember if the obd 1 p72 is tunable. i know the obd2 normally gets replaced. in short you have the wrong map for that manifiold. long story short, you need a different fuel and timing map.

 

run a chipped p28 instead of the p72

 

Thankyou for the replies but in short if i want to pass smog for now with the stock ecu just put a stock manifold back on right?

 

you could. i asked around earlier and the obd 1 p72 isn't that hard to chip. ask questions on what it would take to chip your p72 and put a single runner manifold map on it. less wrench work than a mani swap, especially after you already converted everything. i thought everyone knew by now never to convert a GSR to a single runner intake without ECU work.

 

would you go with a OBD1 P28? I'm one of those who didn't get the memo to not do the single runner in my 97 GSR with a stock OBD2 P72. Installed a Skunk2 Pro Series over the weekend. Right now I'm flashing 7, 10, and 14 CEL codes. IAT, IACV, and TPS. Should this be happening?


Modified by names2blame at 3:19 PM 8/21/2008

 

Why a P28 instead of a P72? Does the P72 chipped ECU need to be tuned in order for the intake manifold to function properly?

 

i have the same problem also.. i have a chipped p28 ecu with a tune but i failed smogg over by 3 times the limit.. haha.car idles fine but the doode at the smog shop said if iuse a stock ecu i should be able to pass.

 

Before you go replacing parts, something to consider trying.



A bottle of that cut the HC and NOx on my 1988 Civic by at least 30%, and took it from "gross polluter fail" to "just clean enough to pass".

 

**** doesnt work.. haha i failed smogg today and i had a bottle of that. wats are some tip on passin somg

 

i have a similar problem with a 97 gsr. rather then having a single runner mani i have the oem one with a 68mm TB. its not that i cant pass smog (not needed in my state) im just getting like half the factory gas mileage. i have an obd2 p72 in right now( i have a chipped p28 awaiting install, but its tuned for a single runner and i dont have one yet) im not throwing any cel at all, however my air to fuel is way the hell off for some reason. cant seem to figure it out please tell me what to do.

 

Get some ethyl alcahol and some octane boost add into a full take, drive around untill at half tank.....by product of alcahol is water.....and the octane boost will clean whatever bad shzznit is left in there....

 

seems like everyone's replies is just running in circles and nobody is really answering your question. If you have a single stage manifold on your gsr, yes, it is ideal to run a chipped obd 1 ecu and getting it tuned for your set up. The stock p72 ecu looks for the IABS in the stock intake manifold, which are eliminated once you go with the skunk2/blox/etc type of single stage manifolds. As for not passing smog, my gsr passed smog with ctr cams, cam gears, skunk2 intake manifold, header, high flow cat and exhaust... and I've used the stock ecu and a custom chipped p28 ecu on the 2 different occasions I had to smog. Most "chipped ecu's" run generic maps that just basically dumps a ton of fuel, causing you to run rich. (reason why some of you fail horribly). You can also chip an obd1 p72 to run properly with the single stage manifold, but as I mentioned, tuning is the key. Try running the stock ecu, replace your spark plugs/cap/rotor if you haven't already, get a fresh tank of gas, drive around to heat up your cat, retard your timing a few degrees (i believe around 14 degrees), and then go get your car smogged again. You really don't need to pull off the aftermarket intake manifold....