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Old 11-16-2020, 09:38 AM   #1
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Join Date: Jan 2014
Location: Falls Church, Va
Default K-Jet no start

I have a 76 242 that is all original. Recently it was getting harder to start, I have replaced the main fuel pump, accumulator and the starter but not much has changed. I can get it to fire sometimes and with my foot on the gas it will run briefly. Then it usually dies and won't start. If I let it rest a few minutes I can often repeat the process. Warm up regulator maybe? Does anyone know what the adjustment screw on the throttle body does? I fiddled with it without actually knowing what it does.
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Old 11-17-2020, 12:39 PM   #2
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Join Date: Jun 2002
Location: S NJ, a suburb of Phila.

I would definitely get the kjet pressure gauge setup and test your control pressure regulator. If it clogs it makes the engine too lean. This will make it hard to start and stall over and over on a cold start. Kjet has three functioning fuel tests. Main system pressure, control pressure, and rest pressure. Control pressure directly influences the engine fuel mixture and can cause running and starting problems if it's not correct.

The adjustsment screw on the throttle body is to prevent the throttle plate when closed from contacting the inside of the throttle body. It should be adjusted so it lets the throttle body close. Usually, that is tighten the screw till it just contacts the throttle arm. Then about 1/4 a quarter to and 1/8 turn against the the throttle arm sets it. Your idle speed is adjusted with the thumb screw under the front of the intake manifold.

Be sure the rubber boot between the throttle body and the air flow sensor is sealed and in good condition. If that isn't sealed it creates a large vacuum leak that can also cause issues like you describe.
1982 242 turbo. 338k miles. MVP coilovers and 3" exhaust. Flowed 405 with a V15. Cossie turbine housing with upgraded compressor housing. 90+, IPD remote oil filter. Some other goodness, too. Been lots of fun over 25 years. Restored in 2k. Now ready for a 2nd restoration.

1993 245 Classic, 435k miles, enem V15. IPD bars and chassis braces. Simons sport exhaust from Scandix. sbabbs ezk chip. Been a good road warrior. Genuine Volvo rebuilt leaky M47.
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Old 11-17-2020, 02:15 PM   #3
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Join Date: Jan 2014
Location: Falls Church, Va

Thanks for the response dl. I have been resisting buying a pressure testing setup but maybe I should at this point.

Funny you should mention the rubber boot, as I was replacing the starter I noticed it had come loose on the bottom end. Looking into it I found all three rubber mounts for the air flow meter were broken! The only thing holding the meter on was the rubber boot itself! It was like that the last time I was able to drive it. I replaced the rubber mounts and fixed the boot and it won't stay running since then.
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