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Mass air flow sensor and other questions (long post) 200 1983-1984

posted by  someone claiming to be Prospero on  Tue Dec 11 09:30 CST 2001 [RELATED]

I just bought an 1983-1984 240 GL last week. While doing a tune-up on the car I managed to break the neck off of the radiator causing a nice 150-degree shower for me and the car. (Ouch!) Anyhow, I have repaired the radiator and have new problems as a result of the shower. It seems as if the coolant got into my air-box and soaked my filter and maybe got to the mass air flow sensor (AMM in volvo). So since I had my open element filter handy; I installed it rather than replace the paper filter and clean the air-box. (Figure that I had to use it somewhere, why not the 240?) Anyhow, I drove the car for a few days and all was perfect. Then the car began to act as if it were out of fuel. I looked over the car and found nothing obvious. So I cleaned the AMM with Berkable brand Gum Cutter. Car ran good for another day. (Figure since the Open element filter was sitting in my storage for a while some dust may have gotten in there and hence onto the AMM strand.) Well, here I am a few day later on...I have had no choice but to un-plug the AMM to get the car to run at all. I have re-installed the factory air-box and am in search of a replacement AMM. I guess it really did not like my K&N open element filter too much! Would it be safe to assume that my sensor is toast? The car will run very strange w/out the sensor connected. With the sensor connected it will only run at wide-open-throttle. And at WOT it will only pull to about 3K RPM in a sick way. Acting like no fuel once again. Strange part is that with the sensor connected and the engine trying to maintain RMP, the car will run great for a second after a back-fire. So anyhow I'm not too sure where to go from here. I have access to a donor car which is a 1987 or newer 240. I have not looked at the AMM in that car to see if it is the same or not. Just wondering if anyone knew if all 240 series AMM's are compatiable or not. Also, will I stand to gain anything from a different type of AMM? I would like to keep the Open filter but I have heard some talk about the can kill the AMM. (Heard this after the fact, of course...) Also, any other suggestions about ways to get around without the AMM. (Tight budget.)

Thanks in advance. Oh, and sorry about the long post.

Prospero







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    Re: Mass air flow sensor and other questions (long post)

    posted by  someone claiming to be George on  Wed Dec 12 03:45 CST 2001 [RELATED]

    On the offchance coolant could have gotten into your AMM connection, check my Tuesday board response to "240 GL Engine Stalls on Train Tracks".







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    Re: Mass air flow sensor and other questions (long post) 200 1983-1984

    posted by  someone claiming to be WBain on  Wed Dec 12 02:57 CST 2001 [RELATED]

    The AMM gets it's power from somewhere. On my 744Ti, it is powered by the fuel pump relay. Try resoldering it first and see what happens. You could also get the schematic and check the voltage at the connector.

    What happened to the 850T, do you still have it?







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      Re: Mass air flow sensor and other questions (long post) 200 1983-1984

      posted by  someone claiming to be Prospero on  Thu Dec 13 04:54 CST 2001 [RELATED]

      Yeah, I still have the 850. 203000 miles and going stronger than ever! Just with all of the recent mods plus my company having layoffs, I have put the car away to save money. Also to preserve the car in the event I need to sell it to survive. I don't want to have to sell it, but most of the people in my industry are looking at 3+ months before finding suitable replacement jobs. (Telcom/ Hi-tech industry is hurting BAD!) Since I'm in with a telcom startup developing hardware, I'm in a dangerous place. We recently let-go of 25 people 2 weeks ago. Rumors have it that there will be yet another go 'round before 1/1/02. So I'm just trying to prepare for the worse-case. (Prevention) So, that's pretty much the story at the moment. So now I just need to get the 240 happy and running well enough to take my 80-mile/ day commute.

      Thanks

      Prospero







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        Re: Mass air flow sensor and other questions (long post) 200 1983-1984

        posted by  someone claiming to be WBain on  Thu Dec 13 07:56 CST 2001 [RELATED]

        Too bad about the insecurity. I hope all will be OK with you in the coming future. I can relate to the long commute, I'm at 100 miles per day. The 740T has 282,000 miles. She still (always) needs maintenance. I just got a new windsheild last week and next I need to R&R the driveshaft. It's a little loose.

        TTFN, wb







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          Re: Mass air flow sensor and other questions (long post) 200 1983-1984

          posted by  someone claiming to be Prospero on  Fri Dec 14 03:23 CST 2001 [RELATED]

          Thanks for the concern. Guess you and I are in very close industries, just you have "big blue" to lean on. I miss having the big-brother company to lean on at times.

          Anyhow, good luck with your car as well. I guess I can't complain too much about my 80-miles per day. The extra 20 miles are likely to be a killer.

          TTYL

          Prospero







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    Re: Mass air flow sensor and other questions (long post) 200 1983-1984

    posted by  someone claiming to be kevin on  Tue Dec 11 13:24 CST 2001 [RELATED]

    you may have the metal AMM and that could run you from $500-600. I have one if you are interested. but you should bring it to a good technician first.







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      Re: Mass air flow sensor and other questions (long post) 200 1983-1984

      posted by  someone claiming to be Prospero on  Thu Dec 13 04:57 CST 2001 [RELATED]

      Kevin,

      Thanks for the input. My sensor is metal. Currently, it looks as if I may have a functional AMM lined up for ~$75.00. Thanks anyhow.

      Prospero







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    Re: Mass air flow sensor and other questions (long post) 200 1983-1984

    posted by  someone claiming to be Phil Stone on  Tue Dec 11 09:50 CST 2001 [RELATED]

    Hi,

    1983-84 Volvos with the B-23f engine have a bosch air mass meter,you can only replace it with that AMM(last 2 #s 002)I have one you can purchase from my '83 245GL parts car.Let me know if you want it.

    Phil







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    Re: Mass air flow sensor and other questions (long post) 200 1983-1984

    posted by  someone claiming to be Jason Kneier on  Tue Dec 11 09:48 CST 2001 [RELATED]

    There are a few different AMMs used in 240s through the years - '83-'84 uses the earliest type, easily distinguished by the metal body (all other 240s have black plastic bodies.) You need a replacement from one of these model years, if that is indeed the problem.

    Usually an AMM failure will result in a no-start or no-run condition with AMM plugged in, and poor running w/out AMM plugged in. But they can do strange things...if something coated the platinum wire that the burn-off cycle couldn't remove, that could cause some strange behavior.

    Other suspects could include - FPR, Fuel pump relays, Fuel Pumps, vacuum leaks, loose AMM or ICU connection.






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