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no start when hot 700 1988

posted by  someone claiming to be ron eames on  Wed May 16 01:43 CST 2001 [RELATED]

As the winter is over an warm weather approaches, new problem become evident on the 1988 740 I just purchased used. The one causing me the most grief is a "no restart when hot" scenario.

Strange that if I let it sit until cold (less than 100 degrees F), it will start right up.

Symptoms and observations.

When hot and not starting, there is definitely spark at the spark plugs. Timing is unknown.

A recent visit with the ontario clean-air people show result of less than 20% of allowable emmissions in the HC, NO2 and CO levels (good huh!).

A usual precondition is once hot, initial turning over of the engine, it will crank without a sputter for as long as you hold the key in the start position. Release the key, and attempt to restart immediately and the car will most of the time fire up immediately. If it at all sputters and dies, I have to wait until it is dead cold.

Any ideas???? Help







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    Re: no start when hot 700 1988

    posted by  someone claiming to be Brian Oliver on  Wed May 16 04:35 CST 2001 [RELATED]

    We had this on a Canadian market '87 745 GLE. It turned out to be the "radio supression" relay, which actually controls injector current. It was 40 bucks CDN to replace, and maybe would have responded to a re-solder job. The car idled and accelerated much better after the change, too.

    In our car, it was mounted on the front of the coolant reservoir, ie away from the radio.

    At least this is a chaep and easy thing to try. Good luck.







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      Re: no start when hot 700 1988

      posted by  someone claiming to be ron eames on  Wed May 16 05:06 CST 2001 [RELATED]

      Brian: Thanks for the input, I have a spare and will try the replacement when it strikes again - ie positively confirm that it is the problem.

      Mark, the following describes your questions (I believe):

      1) The engine is the classic non-turbo, I believe you are correct with the b230f designations

      2) As I am not the original owner of the vehicle, I would have to believe the odometer that states 204,000 Km (125,000 mi).

      3),4)&5) Regarding immediate restart, in all situations it appears to start immediately after the engine is turned off (ie. hot). It really only shows its face when the motor is sat for more than 5 minutes. If it starts (and that is generally 90% of the time), it starts without the throttle needing to be depressed. However, on occasion, it does appear to be running rough for a few seconds. It then immediately straightens out. Touching the throttle afer a start and rough idle does not straighten the problem out. It immediately stalls. Fuel addition to the problem does not seem to be the answer.

      6) To the best of my knowledge, no mechanical changes have been initiated except for the following:

      Winter time I replaced the thermal sensor to the computer, but the original one was found not to be defective. Note during last cold winter, the car on occassion flooded itself. I fixed this by installing a parrellel circuit to the computer where I can insert 1/4 watt resisters to trick the computer into thinking the motor is above 140degrees F. This was successful but doesn't appear to help now.

      Rob: Been through the FAQ's a number of times and tested the likely culprits.

      As a general addition, it may be an over richening/flooding problem that definitely occured in the winter, with a slight different twist. Still do not smell any gasoline fumes though? I have not removed the spark plugs to check for fuel, but it is going to be one of my next tasks when this reappears.







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    Re: no start when hot 700 1988

    posted by  someone claiming to be Mark on  Wed May 16 03:10 CST 2001 [RELATED]

    Ron:

    I have a couple of questions regarding your hot start problem. If you would please take a moment to answer these questions I might be able to provide a little insight into your problem. I am chasing down a similar gremlin in my 92 745. This problem seems to be fairly common to certain Volvos, yet I have been unable to identify a clear cut solution.

    1. Is your motor the b230f or b230ft(turbo).

    2. How many miles on the car\engine.

    3. When you turn the motor off hot, does it start with just turning the key or do you have to press the accelerator to get it to start?

    4. After starting the motor, will it idle normally without your foot on the gas pedal or will it die?

    5. Do you have to give the motor a little gas for a few seconds to a few minutes before it will idle normally?

    6. Have you or a mechanic done anything to the car\engine to try and corrcet this problem?

    Your help would be greatly appreciated and I will get back to you promplty with some ideas on what might be causing this quirk in your brick.







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    Re: no start when hot 700 1988

    posted by  someone claiming to be Rob W on  Wed May 16 01:51 CST 2001 [RELATED]

    You might want to check out the FAQ's for the 700's. There's a lot of good stuff there on hard starting when hot etc.






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