LIM Leaking 3400topend swap Help!

[PCGUY112887]

OK Long story short, I popped my hood today and noticed my coolant was low. Pop the oil cap, and there is is, some white sludge shit starting to build up.

This is def NOT the time for this to happen. I am probably just going to have my mechanic fix it. One problem however. I already have 3400 heads and a 3400 LIM. I am going to see tomorrow if he will do the swap for me and how much it will run me since I really don't have a place to work on this in the winter and I can't have my car out of commission for who knows how long since I've never done any engine work such as this.

What EXACTLY is is needed for the 3400 swap that I would need to get/tell my mechanic about? I know that the coolant inlet is different on the LIM, and there isn't a spot for a temp sensor or something on the head. What exactly is needed to take care of these issues?

I was going to put a 3500 upper intake on and a bigger TB and port stuff but it doesn't look like I have time for that now. I will probably just get a stock 3400 upper intake and TB.

I would need a 3100 head gasket right? Then a 3400 LIM gasket and 3400 UIM gasket... 3400 exhaust mani gaskets... what else am I missing? I need exacts here, I can't leave him in the dark.

Thanks a BUNCH!

[PCGUY112887]

I have a 96 3100 in a Grand Prix btw.

[Superdave]

heads, LIM, plenum and TB. your stock injectors and fuel rail will bolt back on fine. you'll need to find a 3 wire coolant temp sensor from a '93 2.2L Cavalier (will screw into the 3400 LIM) and wire it up like this:

A: Low reference
B: ECT sensor signal
C: ECT gauge sensor signal


and yes, the 3100 head gaskets, 3400 LIM and plenum gaskets. 3100 or 3400 exhaust gaskets are the same and can even be reused if they're in decent shape.

[bszopi]

You can leave the single wire temp sensor undone for now without anything bad going on (except just not having a temp gauge in the dash).

[PCGUY112887]

Is the single wire right now currently in the head or LIM? Soo... one is 1 wire and the other is a 2 wire, then they can both wire onto the 3 wire sensor for the 00+ LIM?

[bszopi]

The single wire is the one that is currently in the head, yes. And the other is a 2 wire. And with the 3 wire sensor, both the gauge cluster and the PCM are fed from a single sensor instead of 2.

[3400-95-Modified]

He should already have a 3 wire sensor at the thermostat, he is a 96 OBDII I thought all of those were 3 wire to begin with.

The Lower coolant outlet is on the backside, I'm not sure for you but for me and my beretta it needs to be threaded to fit the threaded quick disconnect fitting that goes in there for the heater core. The 3400 is all just the o-ringed style that is held in place by the stud on the head.

[PCGUY112887]

I have to actually thread the LIM for something? I can't see this thing, anyone have pics to explain what needs to be done?

[Superdave]

I have to actually thread the LIM for something? I can't see this thing, anyone have pics to explain what needs to be done?

You don't have to, if you get the lower coolant line from the 3400 or a newer 3100 then you'll be fine. You might have to do some creative routing of heater hoses but that's easy.

in the following pic you can see the threadded lower line (From a Beretta) sitting by the hole in the LIM that could be tapped for it.

http://www.superdave81.com/Z24/3400-156.jpg

here you can see what i did (i wanted the Beretta line but didn't want to tap the LIM

http://www.superdave81.com/Z24/3400-159.jpg

i cut off the end of the beretta line and a stock 3400 line then butt welded them together for a perfect fit. Never leaked a drop

[Darin]

What about the EGR? Or is the 96 EGR the same?

[PCGUY112887]

Thanks for the pics Superdave.

I'm curious about the EGR too, I'm not sure if their the same or not. I would just block it off however I'm not sure if my mechanic can legally do that for me. Plus since I don't have a tuner I'd have to buy an EGR simulator.

[3400-95-Modified]

I send you a msg on aim too, but the 96 EGR's have the same plug as 2000+ ones so you can use a newer 2000+ egr and tube and plug it right into your harness with no problems. You wont need an adapter, and I'll probably end up doing the same thing for the coolant pipe since I dont want to thread my 3500 lower when I get that, I'll just cut and weld.

[PCGUY112887]

Took a look at it again today. Looks like my LIM is def leaking, but it's leaking OUT of the block towards the battery. What was on the cap was indeed condensation since I can't spot any inside the valve covers nor can I get it to come back onto the cap.

[dnalbach]

I am in the process of doing the same swap on a 95 Olds and for the LIM inlet I just went to a Pontiac dealer and ordered the 3400 heater inlet pipe from a 2001 Grand Am. They don't use a threaded connector like the older models, they just use a pipe with a flange and O-ring. Wrap the heater hose around the back of the block, and use a screw hose clamp to fit it on perfectly. I thinking tapping it for threads is unnecessary when you can just buy the correct piece of pipe that fits there for $13.

[3400-95-Modified]

some of those pipes done end up pointing in the right direction to the heater core, thats why some people choose to tap the intake. It depends on the body style of your car.