update - in need of a new CAS?

[dhen]

Hi everyone.

Well, it turns out my knock was a loose pulley, but now I have a different problem.

My car sputters at high RPM or under load. This started when I started playing around with the CAS, though it could be something else. I did a search and this guy had that identical problem, which turned out to be the CAS:

misfire-on-boost-high-rpms-t327535.html

Like him, it seems to get worse the warmer it is. His video sounds like what mine is doing, and my problem is intermittent like his was. The only difference is that mine only does it under load. If I rev it when it's parked, it works fine. According to my wideband O2 sensor, I'm not leaning out

This is what I have and what I've done, none of which have solved the problem

1) temp sensor with 1,000 miles
2) Walbro 255 fuel pump with 2,500 miles
3) VPC (MAF delete) - I set it a little richer and this helped a little, but didn't solve the problem
4) set the timing to 15 degrees with a timing light
5) swapped out the ECU with a code 76 ECU (UKDM) from the code 98
6) bumped up the fuel pressure to 40 PSI
7) replaced the coil packs, ignition module, and dropping resistors with known good spares
8) O2 sensor with 2,000 miles
9) swapped out the injectors with known good spares

What I haven't done:

1) swap out the TPS
2) swap out the CAS

One strange thing that happened when I was setting the timing - I was checking and double checking it (it's kind of fun to play with) and the ignition suddenly retarded. Since I wanted to get the timing right, I did the resistor trick to trick the ECU into thinking the knock sensor detected no knock. This made the timing go back to normal. Right before I started it again, I noticed that injector #2 was unplugged. Can this make the computer think there's knock, or do I have a different problem? I attached a video from today with the engine hot:

[youtube]http://www.youtube.com/watch?v=_L_xGCGOIDU[/youtube]

Does anyone have a good used CAS they can sell me? I don't mind buying a new one if that's what I need, but I don't want to spend all that money just to find out that I have a different problem.

Thanks,

Darian

PS I see these guys are kind enough to sell me a CAS for almost $500. You can buy a whole long block for $300 more.

http://motors.shop.ebay.com/i.html?_nkw ... m270.l1313

[roast]

Completely off topic - watch the video, anyone else seeing the mitsu symbol on the cas spinning after the bov releases boost pressure?!?

[blownhemi]

Hi everyone.
One strange thing that happened when I was setting the timing - I was checking and double checking it (it's kind of fun to play with) and the ignition suddenly retarded. Since I wanted to get the timing right, I did the resistor trick to trick the ECU into thinking the knock sensor detected no knock. This made the timing go back to normal. Right before I started it again, I noticed that injector #2 was unplugged. Can this make the computer think there's knock, or do I have a different problem? I attached a video from today with the engine hot:

Did you set it while the engine was at operating temperature?

Completely off topic - watch the video, anyone else seeing the mitsu symbol on the cas spinning after the bov releases boost pressure?!?

Yes, there is one on both my CAS's. Do your JDM engines not have it?

On another note, what is it, that actually goes wrong in a CAS, when they go wrong?

[boost_boy]

Got two, but one is sold and being delivered tomorrow. Contact me if you haven't been able to find one.

[dhen]

Hi everyone.
One strange thing that happened when I was setting the timing - I was checking and double checking it (it's kind of fun to play with) and the ignition suddenly retarded. Since I wanted to get the timing right, I did the resistor trick to trick the ECU into thinking the knock sensor detected no knock. This made the timing go back to normal. Right before I started it again, I noticed that injector #2 was unplugged. Can this make the computer think there's knock, or do I have a different problem? I attached a video from today with the engine hot:

Did you set it while the engine was at operating temperature?

Yes I did. It's kind of strange that it happened all the sudden like that, but I think my car has bad juju...

[dhen]

Got two, but one is sold and being delivered tomorrow. Contact me if you haven't been able to find one.

Just sent you an email.

Darian

[float_6969]

Hmm, could be bad CAS, but I would check ignition first. Do you have a spare ignition module you could throw in to test it?

[dhen]

Hmm, could be bad CAS, but I would check ignition first. Do you have a spare ignition module you could throw in to test it?

Yeah, I swapped that out. It's got to be either the VPC pressure sensor or CAS, unless the TPS can do this. Everything else has been swapped out.

[float_6969]

If it was the TPS, you'd see it running lean when it breaks up.

[Anu]

I had similar CAS problems with the engine sputtering at high load, but in my case it turned out to be a bad connector to the maf, the CAS itself was broken, it made a rattling noise inside, but this did not have any effect (yet) on how the engine ran.

[fabio240]

Did you ever get another cas?

[dhen]

Did you ever get another cas?

Yep, and it ran better, but didn't solve my problem. The next thing I'm going to try is a new MAP and double check to make sure there aren't any obstructions in my fuel system. I'll keep you updated.

Darian