Time for dsmlink?

[Kalisko]

History of my car:
It was rebuilt and put in by a shop
It is a 95 gsx with a 6-bolt(92 Galant VR-4)Engine.

So..I've had a horrible vibration ever since I took my car to get the oil pan replaced.
The vibration is between 2500-3500 RPM range and it varies on how harsh.
The lighter the throttle, the less of a vibration.
It seems to affect performance, once the vibration hits, the engine bogs, and chokes a little.
I've made sure the engine has no vacuum leaks,
I have switched plugs/wires
I have had 2 mechanics look at it. The first mechanic said engine mounts, and the second said it needs a good tune, or probably a rebuild, as something isn't right.
My engine was rebuilt in the spring, and I put about 1k miles on it before replacing the pan,
Once the pan was replaced, it came back with this vibration.
I' Don't know if it'd be a needed tune, due to the fact that the engine was fine up until this.
If it was a tune, wouldn't it have done it since day one?

My question, is it time for DSMLink?


and the second question about having a 6-bolt CAS and a 2g ECU:
Do you need to flip the spark plug wires? or is that in a rare occassion?




"- What does CAS inversion mean?

For 1G DSMLink, nothing. For the 2G guys, the '95-'96 style Cam Angle Sensor (CAS) sends out a signal that's electrically "inverted" from other DSM cam sensors (1G or '97+ style). When you put a '95 ECU into a car with a non-95 CAS, the ECU ends up swapping the firing order of the injectors. In most cases, this produces very little noticeable difference in drive quality. But we offer the option to invert the CAS signal anyway just in case. You can selectively invert this signal with the DSMLink software as you wish. You will still need to swap your spark wires, though. We can't control spark firing order in the EPROM at crank time. So even with CAS inversion, you still have to swap plug wire 1 with 2 and 3 with 4."


-Taken from www.dsmlink.com:dsm:

 

[Detective Coating]

Yes you have to swap the firing order. It is all over here just search it because I don't know it off hand. Have you looked at your motor mounts to make sure none of them are broken? I'll put money on it that it is the firing order that you have messed up. I wouldn't say it is time for DSMLink if everything else is stock.

 

[JayRolla]

Sounds like a major misfire. Dont the 2g's have issues misfiring when swapping a 6 bolt in?

 

[Backinajiffy12]

yeah and if you swap 6 bolt into 7bolt you need DSM Link or when your driving a piston will shut off. or misfire like mad.

 

[shredwin]

Sounds like a major misfire. Dont the 2g's have issues misfiring when swapping a 6 bolt in?

They do have diffrent firing orders, but there is a wiring hardness that will plug into the 1G CAS and then it would plug into the 2G CAS plug, I believe Magnus sells the hardness. That solves the firing order, or you could re-wire it. does the 6 bolt still have the balance shafts in it??

 

[Detective Coating]

yeah and if you swap 6 bolt into 7bolt you need DSM Link or when your driving a piston will shut off. or misfire like mad.

What? No you don't. That is not true whatsoever, you do not need DSMLink for a 6bolt to 7bolt swap. All you need to do is swap the firing order, no need to spread wrong information.

BTW, are you using a 1g or 2g coil pack?

 

[Kalisko]

Probably a 2g coil pack. It stands straight up and the plugs hook in vertically.
I did swap the 1+2 and then 3+4 plugs on the coil pack. Still vibrates, BUT, It did help alot when it comes to starting up. I usually have to fight starting up, thinking my issue was with my recent coolant temp sensor failure.

Do you guys think the motor had something go wrong inside?
I just don't want to buy DSMLink and it' being a band-aid on an axe wound.

 

[snowborder714]

It's always time for DSMlink

Are you getting a CEL?

It's a common issue with 2g's and 6 bolt swaps is to get the random misfire CEL. This will make your car go into limp mode. If you turn the car off and back on, it usually fixes the problem. There are 2 better ways to solve it - the pot mod (not something I'd suggest unless you're in a pinch) or DSMlink. With DSMlink, you're able to tell the ECU not to look for the misfire CEL so you never go into limp mode.

If you still have the stock '95-'96 CAS, then you don't invert the CAS signal. This is because the EPROM ECU is only from a '95 and the '95-'96 cars came with the sensor that the ECU is used to reading. Any other CAS will send a signal to the '95 EPROM ECU, so it needs to be inverted so the ECU can read it properly.

shredwin - Is this the harness you're talking about?
Magnus Motorsports - Electrical Products

That is just used so that the 1g CAS is plug and play and has nothing to do with firing order of the spark plugs.

 

[Kalisko]

That's the wierd thing. I Don't have any mis-fire codes. I only have an EGR CEL, and an EVAP sensor triggered.

I have a 92 CAS with a 95 ECU. I respectively swapped plug-wires as instructed.
I want to get DSMLink but, as I stated, I feel as if It's possible something inside the engine is messed up.


Has anyone else had a problem with this vibration? I feel it most around the throttle body area.

 

[Detective Coating]

How bad is it? Your rear motor mount may be broken. Inspect them and report back.

 

[Kalisko]

I just got done putting my new transmission in, as well as fidanza 2.1 clutch and fidanza 8lb flywheel.

the vibration was there BEFORE I did this job.
Also, the mounts are fine. I've inspected them three times since The new transmission is in.
It's the engine that's vibrating Inside.
It tickles my foot when it's on the gas pedal, coming through the throttle cable. That's how intense the vibration is.

Imagine an electric razor, and amplify the feel of it while holding it in your hands.
that's the "type" of vibration it would be best described as.

 

[byebyev8]

My old 1g had the same vibration, I never fiqured out what it was before the oil pump went out and took the engine with it. But maybe your balance shafts are outta phase that would cause the vibration.

 

[Kalisko]

could that happen by itself? or would it take an act of someone getting in there and mis-aligning them? Just curious. This motor was freshly rebuilt less than 2k miles ago..within 1k of the rebuild it started up..and it started vibrating like this when I drove it home from getting a new oil pan put on.

 

[turboking15]

check all your alignment marks on the timing and with the balance shaft sprocket. like stated a good guess would be balance shafts out of phase.

 

[Kalisko]

Know a good guide to get me a little informed? I know about the shafts but I don't know how to check if they're in phase or not. Does it require dropping anything?

 

[turboking15]

you shouldnt have to drop anything, make sure piston #1 is at TDC, that the marks on your timing gears are lined up, and then there is a triangular mark on your balance shaft sprocket, this triangle should line up with a pointer that is part of the lower timing belt cover.

 

[Kalisko]

alright, thanks. I'll look into it tomorrow.