Couple CA Problems

Discuss topics related to the CA18DE and CA18DET series engines.
xyster
Posts: 2059
Joined: Thu Oct 03, 2002 4:09 am
Car: '00 Prelude

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I've been having a few problems with my CA. It's been swapped in for a few weeks, but I haven't been able to troubleshoot this stuff...it's hard to stand around a car with a damn broken foot...but anyways.

1) It has serious cold-start issues. When I crank it, it starts right up, but usually sputters and dies a couple seconds later, unless I carefully blip the throttle. When I blip it, it causes the rpm to drop to around 300, then come back up to around 1000. It shakes the hell out of the car, too. It reads about 18 on the vac gauge under idle, once it's warm and idling smooth at 750. Timing is set to 15 w/ a timing light clamped onto a KA plug wire between the coil pack and the plug.

2) When driving, it runs fine and hard above about 3.5krpm. Below that, I can put the pedal on the floor in 1st, and it very, very slowly climbs to about 3, then takes off. I think that's due to a massive leak in my ghetto i/c piping though, and should go away when I put on the new, real piping. I have my o2 sensor plugged into the harness where I assume it goes, and the brown "o2 power sensor wire" that runs near the battery tray hooked up to a 12v power source (i.e. the 12v circuit that runs my fans, directly to the batt w/ a toggle switch). Where should it be hooked up? because I know that's not right.

3) I went out last night, and my battery was completely dead. I haven't driven or started it in a week and half, due to the fact that I couldn't walk down, or press pedals. Could that be due to my poor o2 wiring? All the other wiring is nicely done, I swear, I just didn't know where to put that o2 :confused: .

4) where's a good place to get the silicone or rubber hose couplings that adapt 2 1/4" i/c piping to the larger throttle body, and the smaller turbo outlet? And what size are both those?

Thanks for any help you can give me on these. I feel stupid asking such noobie questions.


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Nismo1182
Posts: 1697
Joined: Thu Oct 24, 2002 6:51 am
Car: Z06

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My has a cold start issue also. I HAVE to let it idle and warm up.

If I touch the throttle while its still cold it will sputter and not go anywhere.

I can rev it up lightly but if I give it too much gas it does the sputtering thing.

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USDM_OneVia
Posts: 570
Joined: Sat Apr 05, 2003 5:17 pm
Car: Racing
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1 and 2 are related. A massive vacuum leak will cause all kinds of problems. Fix that first, then go from there. You just have to tackle the issues one at a time, or you will give yourself a bigger headache.

Joe

xyster
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Joined: Thu Oct 03, 2002 4:09 am
Car: '00 Prelude

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what about the brown wire on the CA harness down by the battery tray? is that o2 sensor power? what 12v power source did you hook it up to?

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Trigger
Posts: 550
Joined: Fri Mar 14, 2003 6:13 am

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the o2 should be hooked up to the plug with the black,blue and brown wires going into it. should be right there close to your coil wires

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USDM_OneVia
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xyster wrote:what about the brown wire on the CA harness down by the battery tray? is that o2 sensor power? what 12v power source did you hook it up to?


Get me a list off the wires you have connected up by the battery tray and lets start from there..... put the CA wiring on one side of the page, and the KA car harness on the other side and what colors you have matched up.

Joe

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float_6969
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Joined: Mon Aug 26, 2002 1:55 pm
Car: CA18DET swapped 1995 Nissan 240sx (too many mods to list)
2015 SV Leaf w/QC & Bose (daily)
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Mine was real cold blooded too until I got the new O2 sensor in there, figure that one out? It still needs to warm up for a couple minutes, but it did the cold start things like you described. As for the brown O2 wire, I actually found out that the brown wires for the KA harness are 12 V switched. And since the brown wire near the plug is the brown power wire for the O2 sensor, I just hooked it up there and I have no problems. Get your leaks fixed and see what that does for your cold start/run problems.

xyster
Posts: 2059
Joined: Thu Oct 03, 2002 4:09 am
Car: '00 Prelude

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I followed the srswap.com wiring diagram exactly.

xyster
Posts: 2059
Joined: Thu Oct 03, 2002 4:09 am
Car: '00 Prelude

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float, you were exactly right. I hooked up the brown wire on the CA harness to the brown wire on the KA harness, and it started right up, and ran beautifully. There was no stumbling like before, and it pulled way harder. Of course, I also re-tightened all my i/c piping clamps, and readjusted all that, so that might have been a part of it. thanks for your help.

xyster
Posts: 2059
Joined: Thu Oct 03, 2002 4:09 am
Car: '00 Prelude

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well, after looking at the wiring diagrams for the CA and KA, it seems that wire runs to a lot more than the o2 sensor. It looks like it runs to the AAC valve and the pressure regulator solenoid too. I think that wire was the cause of all my problems. Now it's overheating...but I think I have a leak in a hose connecting to the heater core, letting air into the system, and causing it to overheat and blow coolant out of the rad cap. I need to check my thermostat too.

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float_6969
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Joined: Mon Aug 26, 2002 1:55 pm
Car: CA18DET swapped 1995 Nissan 240sx (too many mods to list)
2015 SV Leaf w/QC & Bose (daily)
Location: Topeka, Kansas
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Aren't the little things just soo fun? I just found out last night that the oil seal went bad on the compressor side of my turbo and so i've got oil in my intercooler piping now. Fan-friggin-tastic...


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