6 Bolt swap now stumbles at idle

[4twenty]

I recently finished my 6 bolt swap and the car was running great until yesterday. At idle it sounds like it is misfiring. I checked the plugs and they were black so I put some new ones in. I could hear a vacuum leak around the throttle body. I think it is the tb shaft seals leaking. Would that cause my problem? When I drive it seems normal although I am babying it now since the engine only has 70 miles on it. I am using NGK BPR7ES plugs. The timing was never set but the vacuum gauge was reading 19-20 at idle. Now the boost/gauge reads 10 at idle and it is stumbling. Thanks for helping.
Jared

97 GSX
90' 6 Bolt
EVO3 16G
PROBLEMS

 

[ThatsMrAwd2u]

Damn im having the same problem... Exept i started to experience this after a timimng belt job. My mechanic cannot explain and neither can I. I have the same mods as you and this driving me crazzy... if you find the problem please let me know.

 

[DSMcrazy3]

u guys are turbo'd and i'm not but mine was misfiring before and i was told it's the EGR valve...but ur vaccum gauge may have ruled that out..i'm not sure of what the #'s on the reading mean...anyways just thought i'd throw that in there...sorry if i'm way off

 

[98yctuner]

woah, im having the same exact problem, itll idle rough with a misfire for a couple seconds then idle starts to drop and drop to where it turns off! cars been out for 3 months! please let me know if you figure this out

 

[silveraider]

Is it a 7 bolt head?
I just finished reading a resolved problem at idle the guy had a 7 bolt head and gasket but 6 bolt block where the 6 bolt block has larger bolts to the head the 7 bolt head gasket is smaller and will cause a small leak around every bolt

 

[bryanwheat]

What cam angle sensor are you running on this setup? IF you use the 1g sensor without dsmlink you will get random misfires. You can fix it by adding a 10k potentiometer inline with the maf sensor.

Is it a 7 bolt head?
I just finished reading a resolved problem at idle the guy had a 7 bolt head and gasket but 6 bolt block where the 6 bolt block has larger bolts to the head the 7 bolt head gasket is smaller and will cause a small leak around every bolt

The 6 and 7 bolt head gaskets are the same.

 

[silveraider]

http://www.dsmtuners.com/forums/newbie-forum/411898-idle-problems-few-other-things.html

I am sorry I misread... I thought head gasket, It was intake gasket that was incorrect... My bad, either way I'm not sure how much it helped, just a previous person with some idling issues

 

[miguelmcv]

For the idle, Do a boost leak test, it will be just a hose.

For the misfire, it would be a bad ground, or alternator amp.

I used to have misfire when my swap, But, my car is a 95, so is more known to get misfire, which the cas is inverted.

For you guys 2gb, I don't think that you get misfire, which the Cas rotation is the same as the 1g Cas.

You are getting misfire because of volts are not accurate, Clean all the grounds, positives and check for terminal (wires) to be all good.

If any terminal (wire) is bad, it can cause misfire.

It happens to me, and was a pain in the ### to figure it out.

I change my alternator which I was not seeing stable volts, and at the end, it end up being a bad ground connection.

I clean and sand all the grounds (tranny, firewall, and battery terminals), changed one wire, and problem solved.

 

[98yctuner]

Ive been on this for weeks, hopefully this helps. I checked all wiring and its the same as the one i found on the road race website? but what i dont get is why does it die??? everything seemed to be good..