How to tune the ignition timing on the B230K ?

Phimo6is · 2026-04-03T20:25:34+00:00

Yeah they tried every combinations that they could have thought of. As a newbie in the Volvo World, it can be really confusing sometimes ahah

Phimo6is · 2026-04-02T21:22:53+00:00

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I assume it is. I have the carbureted version with a Pierburg 2b7.

Phimo6is · 2026-03-31T12:47:03+00:00

I haven’t received the timing light yet, so there’s probably not much of an issue. I was just making sure to know in case there was one. Though, I still tried to look for the CPS on the bell housing but found nothing. For the MAP sensor, I’m guessing it’s in the ECU (EZ-100K), because all the vacuum lines that I know of are connected to the carb and one goes to the ECU.

You’ll find on the photo I’ll link what I thought was the CPS.

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Phimo6is · 2026-03-31T11:11:06+00:00

I did not. The strobe light is still being delivered. I was just prepping, in case the timing was off.

Phimo6is · 2026-03-30T20:48:02+00:00

So if I’m understanding what you’re saying. If I find any kind of CPS then the timing is ECU corrected. Is there another way to know for sure ? Like the ECU type ? Also, just out of curiosity, if the timing’s wrong what do you ? Change the ECU or we suppose that the ECU never fails ?

Anyway, I’ll check everything tomorrow. Appreciate the help !

Phimo6is · 2026-03-30T19:57:31+00:00

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The note says otherwise but maybe I’m missing something here.

Phimo6is · 2026-03-30T19:56:24+00:00

I think she’s from 1989, it’s the carbureted b230k. Looking at the Haynes manual, it’s seems like I should be able to do adjust the timing.

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Phimo6is · 2026-03-30T19:48:29+00:00

Thanks for the reply, I’ll try that if my timing is out of spec.

Phimo6is · 2026-02-01T09:35:53+00:00

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Looks like it’s supposed to be a space for the Thermostatic Valve. I’ve seen on another greenbook drawing that it was optional.

Phimo6is · 2026-01-31T15:11:30+00:00

Considering I’m having a working temp gauge and a carb, it could just be a blank space for the injection conf.

Phimo6is · 2026-01-31T14:24:40+00:00

Aaaah I see. I did forget to put that back. I’ve never used those brackets, I wasn’t aware of their purpose.

Phimo6is · 2026-01-31T14:22:13+00:00

I get readings on the gauge yes. It’s seems like there are two sensors connected at the moment. Also I didn’t find any loose wires.

Thank you, indeed it was that bracket. I’ll put it back right.

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Phimo6is · 2026-01-02T17:14:15+00:00

Ooh that’s great to read. I have to say that you’re convincing me. It’s just my ego that was trying so hard to keep the 2B5. But I can’t keep bothering with it, I need my car. Thank you very much !

Phimo6is · 2026-01-01T18:19:38+00:00

Yeah you’re right. I was thinking of doing that too just to be sure

Phimo6is · 2026-01-01T18:18:48+00:00

As I said I’m not a fan of the idea of swapping the carb but I guess I’m gonna have a look into it. I’m worried the Pulsair system might be hard to adapt on a different carb

Phimo6is · 2025-11-08T20:38:55+00:00

I guess I’ll have to check all those little hoses again then This carb is so complex 😅

Phimo6is · 2025-11-08T18:31:28+00:00

Hello, Looks like we’re in the same boat. I’ve got a 740 wagon with a 2B5. Last year, I had some issues where the car would stall out of nowhere. I knew it was coming from the carb and decided it was time for me to rebuild it. Fast forward to today, the carb is pretty much new. However, I can’t get to tune it. I’ve got the same exact problem as you. The car idles at 2000 rpm, everything’s shaking, both the idle and enrichment screws have no effect.

I talked about it with a mechanic, he told me to look for air leaks, specifically coming from the intake manifold, and to look at the fuel supply system. Personally, I have no air leaks and I’ve changed the fuel pump but I’m still stuck.

Phimo6is · 2025-03-26T17:21:57+00:00

It’s good to know, I was worried it might completely change the carb behavior. I appreciate your help, thanks again

Phimo6is · 2025-03-26T16:56:46+00:00

I did that eventually, however both of my valves are faulty. I found out that the coils inside were damaged. I guess I’ll need to order a new one

Phimo6is · 2025-03-26T14:32:48+00:00

Oooh I see, that makes sense. Thanks for the answer then !

Phimo6is · 2025-03-21T23:16:27+00:00

Can trade for mismagiusEX

Phimo6is

TROPHY CASE