New ECU = new fun :) / Now with FAN ISSUE

[Josh]

So, the 94 GS has been running 95 klde ecu with a KL02 VAF on the ZE. SO!!! Just changed the VAF out to a JE50 and installed the KL36 ecu, I did not change the disty, and the results are a completely new car... I am not joking! Such an improvement, idle is better, smoother, power band is stronger, the engine is way more responsive. Now I just need to change that KLG4 mani on there and it will just about be complete.

Sorry just had to share

[Clappy]

how bout you share where i can get my hands on the KLZE ECU..

[wagZE]

Nice! I am kind of curious about the g4 manifold are you gonna put that in soon?

[Sleeper6]

Im putting mine on next month if he doesnt get his on

[Josh]

Yeah, I just got my dremel out of storage... So , soon very soon. I had planed on making my own thermal gaskets at the the same time but I think I am going to wait. I want to hit up the dyno and get some more base runs but I don't feel like spending 60 bucks

[Josh]

Ok so now that I have driven on it a bit, IT still is better. But I noticed this evening my engine was running warm, so when I got home and opened the hood the fan relay was clicking and the fan would engage for like a second and kick off doing it over and over. I read before that people had issues with the fan turning off but not like this. Any thoughts?

Do I need to change the relay out to a different one? There is an extra coolest sensor run and it is tapped unit the ECU, possibly bad sensor?

All thoughts welcome

[mikeinaus]

i guess its possible it could be a bad sensor. try unplugging the coolant sensors 1 at a time and seeing if they fix the problem. the fan would come on instantly but if it does it would make sense the sensor is faulty...

[Nd4SpdSe]

Could be a bad coil in the relay, I've had them to that to be before.

[Josh]

OK, that is where I was going to start later today. Weird it was working fine with the DE ecu and now not. But things go out. My first thought is a bad sensor, second is the relay. It is getting power and switch on for a second then turning off then on and so on, so I think it has got to be one of the two.

Anyone know if a Mellenia uses a different fan relay than the MX3?

[Nd4SpdSe]

Ya I kept blowing relays for my first CarPC setups, drawing too close to the max the relay could handle, I could tell when it was gone when it would do the "click-click" when I turned it on and nothing happened.

Depends, if it's a regular automotive relay, than anyone will do, if it's a "special" one, if it fits in the socket, it'll work, they don't change unless they're really different, than it won't fit at all.

[Josh]

Well some brief research on Rock Auto the MX3, 2.5 626, and the 2.5 Mellenia all use a different fan relay but use the same fan switch and coolant temp sensors. Seeing as though the DE ECU had no issues with the relay I think I am going to try the Mellenia relay and see if that changes things.

I will have to check my manuals when I get home for wiring schematics to make sure they are the same.

[davmac]

You might start with the fan (apply power and confirm it stays on) and work your way back. Don't know if your fan and wiring to it are original equipment. My personal experience is corrosion in the connector to the fan and then a year later the fan itself giving up completely. Of course you may find problem with the relay or temp sensor which can also be tested.

[Josh]

SO been working on the fan issue, and it was not one of the three fan relays. So before it was not cycling properly, the fan would come on for a seccond and then off and repeat. Now when warm the fan will come on and stay on. It is not cycling. So I think I may have narrowed it down to the top or 3rd coolant sensor. I tested the Ohms and it is supposed to measure out at 1.04 ohms and it measured out at like 7.04. That could be an issue. And it is wired up correctly per all the threads I have found on it. I guess I will try swapping that out first and go from there.

[RX8SE3P]

I had a faulty sensor recently. I'm fairly certain it was the the one closest to the coolant cap, which is the one the ECU uses to base air/fuel mixtures on.

Mine was cracked a bit from too much playing around on my behalf. Fans would come on intermittently in quick succession. Engine would also get rough at times. Turned out it was faulty and always thought it was too cold, thus ran rich, and made the fans come on and off a lot. It must have thought, oh it's hot now, turn the fans on, no wait it's cooled down, turn off again etc.

Changed it for the one I had on my K8 engine. All of a sudden I gained much more power and better fuel economy, and no more intermittent fan issue.

[Nd4SpdSe]

Changed it for the one I had on my K8 engine. All of a sudden I gained much more power and better fuel economy, and no more intermittent fan issue.

People underestimate the function of the coolant temp sensors on power and fuel economy...