[binx811]

just bought a used evo 8 '03, and having some probs. the only mod it has right now is hsk bov and its cat-less. so the prob is that when shifting from 3-4 and 4-5 and im flooring it the car seems to studder, almost like it wants to stall out at 5500 rpms. then like a few seconds later it comes out of it and is fine untill i get to 5500 in the next gear. any suggestions??? this really sucks cuz i cant go to the full potential of the car. please let me know asap on what i can do. thanks

 

[CArkid0101]

it could be misin, is it throwin a code? check the fuse for the light to to see if the light even works. Also it could be fuel cut, idk, illeborate(spelling) on your situation

 

[binx811]

im sorry, kinda lost me there. what light am i checking for? you asked to illaborate on my situation, thats pretty much it. if i floor it, the car jerks for a few seconds and then, like nothing, back to normal. thanks for the help:thumb:

 

[SicLanEvo]

Get some NGK bpr7es plugs and see if that fixes it, My eclipse used to do it before i swapped in the colder plugs. My evo has done it once or twice when i had the boost turned up. how many miles are your evo? Also do you have a boost gauge?

 

[binx811]

i do have the ngk plugs in, so i dont think its that. but i'll check. and no i dont have a boost gauge. i just recieved it, but no time this past weekend to install. my evo has 27k miles on it.

 

[binx811]

could it be that im boosting to much? what should the reg. be??

 

[SicLanEvo]

it could be you are boosting too much, how old are the plugs? They could be fouled and need to be replaced, it would only cost you about $10 and take about 15minutes tops. It would be a safe place to start. You should really have a boost gauge too.

 

[binx811]

plugs are only a month old. ya i'm going to get that boost gauge installed asap. what should the boost be at???

 

[evo8kiko]

plugs are only a month old. ya i'm going to get that boost gauge installed asap. what should the boost be at???

set your boost at 19 and make sure you gap your plugs at 28. take your time when you gap your plugs.

good luck

 

[Fourdoor]

Put a stock BOV or full recirculation aftermarket BOV on the car and it will solve all of your problems mentioned.

Keith

 

[evo8kiko]

good idea. You wont go wrong with the stock BOV unless you are running higher than 24 psi. make sure you gap your plugs at 28

 

[binx811]

Thanks for all the info!:thumb: Thats why i love the whole evo comunity:dsm: I'll keep you guys posted, this weekend i will be installing the boost gauge and i will also take a look at the plugs and make sure they are gapped at 28. how do i know if the plugs are fouled? what should i look for? as for the bov, when i got the car it didnt have the stock one, the guy had a blitz bov leaking massivly. i have the hks and i picked up the recirculating kit, so i will do that this weekend too. Also, if the boost is over 19 how do i lower it? do i have to buy some kind of tool for this or will reg home tools work? Wish me luck!!!!

 

[turbolarry]

how do i know if the plugs are fouled? what should i look for?

http://www.machv.com/diagsparplug.html

 

[binx811]

thanks for the link turbolarry.:thumb: thanks everyone again. i let you guys know how it goes. rock on:rocks:

 

[Warrtalon]

Thanks for all the info!:thumb: Thats why i love the whole evo comunity:dsm: I'll keep you guys posted, this weekend i will be installing the boost gauge and i will also take a look at the plugs and make sure they are gapped at 28. how do i know if the plugs are fouled? what should i look for? as for the bov, when i got the car it didnt have the stock one, the guy had a blitz bov leaking massivly. i have the hks and i picked up the recirculating kit, so i will do that this weekend too. Also, if the boost is over 19 how do i lower it? do i have to buy some kind of tool for this or will reg home tools work? Wish me luck!!!!

Hmm, wow, sorry that I didn't see this right away. We could have nipped this in the bud a long time ago. There were a couple of misleading things early on, but I think you are on the right track now. This is what you should have done, and I highly doubt this is a spark plug issue unless you just aren't explaining the situation properly. I can't tell if you are stumbling/stuttering at 5500rpm after a high rpm shift, if you are stuttering at 3500rpm in the next gear after a shift at 5500rpm, or if you are just having trouble when accelerating around 5500rpm. All of these scenarios indicate different problems, so it would help if you are more specific about what is happening and when it is happening.

1) Get rid of the HKS SSQV now and forever, no matter what. Sell the SSQV, then use your stocker until later when you will need a stronger one if you do certain mods.

2) No, the stock, plastic BOV on 03-05s is NOT good up to 24psi. In fact, it has been tested (by me and others) and shown to leak as early as 13psi. It is only "ok" for stock boost levels, which is where you are now.

3) You really, really, REALLY need to study up on your Evo. The fact that you're asking if there is some kind of tool (reg home tools???? WTF ) to adjust boost just really scares me. Having a car like this, you should definitely understand the basics, such as the fact that almost all of us use Manual Boost Controllers ($85 "tool" for adjusting boost) while some use fancy Electronic Boost Controllers. You need to take the money from the sale of your SSQV and get an MBC - I prefer the Forge UNOS.

4) Holy cow, yes you need to get that boost gauge installed asap. It is the single most important "mod" you can ever do on your Evo. Once it's installed, you will see what your boost is. It SHOULD be stock still, which is ~19psi peak and ~16psi by 6500rpm - it is designed to taper down naturally, but an MBC will remove that taper while also allowing you to raise it to the proper boost levels and gain power all over the place.

5) Do NOT try to re-gap your stock plugs if they are the Iridiums (BPR7EIX). They should be gapped fine, but it's always possible that they have fouled or been damaged during installation. If they are already NGK BPR7ES, then check the gap and put it at .026, not .028. If not, then purchase some copper NGK BPR7ES at Advanced Auto (or Autozone), then gap them to .025-.026 and have them ready. Your actual issue should go away with the installation of the stock BOV, but if it doesn't for some reason, then try the new plugs. Do not try to regap your current plugs unless they are already aftermarket copper plugs.

 

[binx811]

again thanks for the info and i will keep everyone posted to let you guys know what happens.

 

[Warrtalon]

the worst thing to do when troubleshooting a malfunctioning BOV on the Evo is to add an HKS SSQV - bad move even if you already had one. Even with the recirc kit, it can be problematic.

Just thoroughly go through the steps I mentioned above, and I'm sure we'll rememdy the situation. I still also need you to give a DETAILED DESCRIPTION of exactly what happens...

 

[binx811]

hey guys, so i got the boost gauge in and im boosting peak 20 and it settles between 15-16. i couldnt work on the car any more during the weekend cuz it started to rain. but yesterday my budy picked up a new bov for his 06 evo IX and let me have his stock bov. i have instaled it and now its a little different studdering. now in every gear my car starts to studder (only at full acceleration) starting at 3500 and then it comes out of it towards 6500 to 7000 rpm. when i drive the car, its perfect at half accerleration (no probs at all). I do have the Iridiums NGK, and i have not check the gap to see if when the place that installed it gapped them not knowing not to. Its pretty sunny today, so when i get home i will be checking that. also, does anyone know what the stock bov on an 06 evo IX will hold boost better? will it start to leak at 13psi??? if not the spark plugs, any other ideas seeing as the stock bov is back on???? Thanks to everyone in advance!:thumb:

 

[turbolarry]

does anyone know what the stock bov on an 06 evo IX will hold boost better? will it start to leak at 13psi??? if not the spark plugs, any other ideas seeing as the stock bov is back on???? Thanks to everyone in advance!:thumb:

No it shouldn't leak at 13psi.
It might be time for a boost leak tester;
http://www.vfaq.com/mods/ICtester.html
Coils going bad?
Is the check engine light on?
... and just to rule out the obvious; what octane gas are you running?

 

[binx811]

no the check engine light is not on, and i was just asking about the leak because what warrtalon was saying that they tested them out and they start leaking as early as 13psi. im running 91 octane. well i'll check the pulgs today and if not maybe the coils are going bad. how would i check that without having to buy the new ones first?