First GSX!! But, it's still a DSM with issues...

[johnovision27]

Hello one and all! Finally after 5 years I managed to pick myself up a '97 GSX!
Currently own a GS, so I'm pretty familiar with the 420a. However, the 4G63 is a bit of an issue for me.
Overall car runs great, but there are some issues.
At start, idles perfectly (750-900) but over the course of the drive, when ever it comes to a stop, the idle will vary from 750 - 2200. Doesn't matter when it's running cold or hot, it just likes to change all the time.
Other issue I'm having is the mixture is running extremely rich. I mean rich to the point where if I have the blower going, I can smell it in the car.

Any input would be greatly appreciated, and please keep in mind that I'm still getting familiar with the engine layout. Abbreviation are cool and all, but please let me know what the full name is.

Oh! lastly, for all those other GSX owners...... when doing 60mph in 5th, what rpm are you sitting at?

 

[gingerbredman00]

I believe mine is around 2850-2900 going 65.
but mine is a 90

 

[moi1463]

Mine used to do that, make sure your throttle cable isn't too tight, loosen it up a bit and see if the problem still occur. but don't have it so loose that there's too much play when you press on the gas peddle. and for the rich problem it could be your O2 sensor, mine wasn't registering(dead) anything, so that made it run rich. Is your CEL on? if so scan for the code(s) and go from there.

 

[Luckybob2485]

Do you have any check engine lights on? I am probably around 2000-2500 rpm at 60 in 5th gear. Also, it could be a faulty o2 sensor causing you to run rich, or you could have a fuel leak somewhere. What modifications are done to the car?

 

[blkgst97]

+1 on the throttle cable. Mine also did that, as for the running rich, have you done a boost leak test? Maybe the car has an walbro 255 and no afpr.

 

[illinifrever]

+1 for the boost leak. My TSi did the same thing.

In my 95 TSi AWD i'm doing between 2700-2900 at 65 depending on the weather.

 

[hondaslayer1]

Pull the back seat out and get to the fuel pump.make shure u don't have a bigger fuel pump.if u do get a adjustable fuel pressure regulator.if not check the 02 sensor.also u can adjust the idel screw on the throttle body to fix the problem set it to 800 or 900 rpm.but only if no check engine light.

 

[1fast97gsx]

Sounds like a vacuum leak.

 

[GSXSixteenG]

Sounds like a vacuum leak.

I agree with this. Do a BLT, check your intake manifold gasket. Willing to bet that its a vacumn leak causing the bad idle.

 

[johnovision27]

Well, you folks know your stuff, or so it seems.
Mods to the car - 16G turbo, Greddy type RS BOV, Evo 3 510CC injectors. i believe thats all that would have an effect.

The engine light just came on today, ran the code = dead O2 sensor no. 2. later on in the week i'll get that one checked out. I also checked the fuel rail. after running for about 25 mins, i could hear a little hissing and all 4 O rings are toast. Going to have to order some more of those and that may be the cause of the fuel smell in the cabin.
I did adjust the throttle cable a little today and it seems to be doing the same thing. I'll loosen it off some more tomorrow and see what happens there.

Thanks for the quick replys!

Oh, also i'm not to sure how to do a boost leak check..... anyone know any simple yet reliable methods??
2800rpm at 60.. just seems higher compared to 1900 in my GS

also, keep in mind that the idle is only bad after it runs for >20mins. before that it will return to the 750-900rpm with no hesitation or fluctuations.

 

[whiteflash]

Do you have any way to control those injectors?

 

[johnovision27]

currently, only the gas peddle.
no, i don't. i was looking into getting the guys at Magnus to give the car a tune once i figure out all these other problems.

 

[johnovision27]

GOOD NEWS!!! After waiting for my parts to jump the boarder, I installed a fresh set of injector o-rings and voila! No more fuel smell!! With any luck that will fix the mixture problem and the idle as well. We'll see after i take it for a nice long drive.
Note to self - when depressurizing the fuel system, don't forget to take the fuel cap off the tank. it will save you 35L of expensive gas.

 

[spooln4fun]

Haha, thats a good tip for those who dont know. glad you have fixed one of the problems. Welcome to the fun side of DSM's

 

[johnovision27]

update!!!
haven't really pushed the car hard except for one run this evening. didn't/never goes an inch over 10PSI of boost, but now have rattle above 3000rpm....... just sounds like something is loose. yes, i know it's very generic, but any ideas? i'll go out and investigate tomorrow when the sun is up

 

[ckrummy]

GOOD NEWS!!! I installed a fresh set of injector o-rings and voila! No more fuel smell!!

Your lucky i had that problem last winter and the car spontaneously combusted, but i got the fire out before it hurt anything.

 

[johnovision27]

Your lucky i had that problem last winter and the car spontaneously combusted, but i got the fire out before it hurt anything.

I hear ya. I left it in my school parking lot for 3 days due to that fear. Glad you got it out in time, that would be heart breaking.

and the GSX is parked again..... that loose sound stopped for about 3km then turned into a "oops, your engine doesn't work anymore!" sound..

so, my question is now this. It went from running smooth and normal to what felt like a minor drop in power, then there was a huge rattling sound like something literally fell off under the valve cover. upon slowing down and downshifting, the engine just quit. only when i released the clutch back into 4th gear, it came back to life with that heart dropping *clunk clunk clunk* until depressing the clutch again and stopping it.
what would cause the engine to just stop running? there was enough electrical power, fuel in the car, and all fluids.......

 

[johnovision27]

Well, looking back, my last post was 27/11/09.... it's now 21/1/10
which makes me very sad because my GSX has been on stilts for over 2 months.
Between exams, Christmas and getting back in the whole school ordeal, i've forgotten to do updates.
So, here's where we stand.
It threw a rod.
I believe the problem is when buddy did the rebuild, he didn't line up the bearings correctly (let me know if i'm wrong)

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So, thats the damage. Off i go to get a new engine on friday.
The crank is no good, no idea what damage has been done to the cylinder walls or the piston heads for that matter.
The head and all the valves are ok *thank god!*


So, while pulling the engine over the break, I ran into some rather interesting finds.
No.1 --> Turbo compressor
Take a look and give me your input, but I'm strongly edging towards installing a catch can. I checked where the oil was coming from by swabbing all the vac lines going to the intake and the valvecover breather was coated in oil.
Also, could someone tell me what kind of turbo this is? I know the pictures don't give a good view, sorry, it was an after thought.

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On the plus side, the bearings still seem to be ok, and there is no shaft play, but I need a new compressor wheel, thats a given.


And lastly, before I take off.... This is one for all the retard mechanics out there. If you're missing your 12mm short socket attachment, look inside of the intake ports on the head. Ok, stop. Reread that. There you go. While taking this apart, I found a 12mm short socket IN!!!!!!!!!! the no. 4 cylinder intake port. UNBELIEVABLE!!!!!!!!

 

[dsm darthvader]

^^^unbeliable indeed, i cant believe the car ran at all with the socket in there. Looking on the bright side now you can control the engine work since you are starting out fresh

 

[constant_proj21]

Judging by the tiny turbo inlet, that looks to be a t25, wouldnt rebuild it, just get a 16g. It's always nuts to see engine carnage like that. But hey, you got a free 12mm socket! Hahaha

 

[ssmitty85]

Well.. That turbo you have is most definitly not a 16G.. Most likely a stock t-25, possible a t-28 if your lucky. But based on what happened to the engine and what not, I would bet on a T-25.

 

[johnovision27]

Haha, yea.... I don't even know how you put it in there to start with! no damage or anything in the intake port. It got stuck right where it splits into the 2 valves. but still...... wtf?!

Gotta love a fresh start though. Aren't the Japanese import engines tuned a little differently? I'm speaking out of ignorance here, thats just what i've heard.
Same for the turbo, just scrap that one (maybe make a turbojet engine out of it...hmmmm) and get a 16G? What about a 20G? Again, new to the turbo scene so all help is appreciated. I know that a stock 4G63 block can take about 15psi (12 to be safe) Thoughts?

Lastly, if i put a 16G on there, would i need a J-pipe to get the outlet back to where that one is?

 

[Clinical]

a 16g would work fine for you starting out.

Do you have any tuning software? (DSMLink / keydiver chip)

 

[johnovision27]

alrighty, 16G it is! and nothing as of yet. I haven't had any time to even entertain that idea! Care to edge me along a suitable path? I like the idea of an SAFC for on the fly adjustments, and it looks good in a car.
DSM link, i've heard some good things and bad things about it.

 

[caboose]

go with link it gives you everything you need.