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740 turbo won't start for anything.... 700 1987

Ok, so my friend just bought a 740 turbo, B230FT engine. It worked the night we testdrove it, but the next day, no go. We're up in Waterloo, Ontario and it's been darn cold up here, but we put it in a garage that's kinda under a house, so it's right around freezing in there. The engine will turn over slowly, and with a jump it will turn at about normal speed, but won't start. We've checked the fuel pump and relay, thought the relay was bad, and bypassed it tonight. The fuel pumps both run nicely. we even checked fuel at the fuel rail--nice flow. We checked for spark in the spark plugs--just fine. So what is going on? The car is getting fuel to the injectors, which are running, sparks from the plugs, and the engine is turning with the starter. but no start. We're both completely stumped, and though this is my first time working on a 740, I've done piles of work on my '86 240...so I can usually figure out what's wrong...but not this time. Any help is greatly appreciated! thanks so much yet again in advance!
nate gundy








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    740 turbo won't start for anything.... 700 1987

    Are the plugs dry or fuel soaked after repeated attempts at starting?

    Dry? The radio suppression relay may be at fault. Pull the relay and insert a jumper between the two heavier wires on the plug. Not sure where the RSR is on that car- tucked under the angled brace at the right rear of the engine compartment? The RSR enables the injectors to operate.

    Wet? The temperature sensor that tells the ECU how much fuel to provide for a cold start may be defective (or the spark plugs may not be providing a good hot spark under compression. Dry those plugs or better yet install a new set as you don't know how long they have been in service).

    Randy








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    740 turbo won't start for anything.... 700 1987

    Our b230FT did this once. I pulled the plugs and they were soaked in gas. Dried out the plugs, jumped the battery and cranked it till it fired. Weird thing is this has never reoccurred so I don't know what caused it.

    Bob
    91 744t








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      740 turbo won't start for anything.... 700 1987

      If the distributor has a black shield around it, remove it and clean cap thoroughly. Shield is notorious for arcing. Check hal effect sensor. Pull fuel pump connection off fuel rail and have it run in 2 liter bottle when ignition is turned on. Should be steady stream. Check resistors by battery, corroded connections.


      Just went through same issue last week. Plugs looked to be firing ok, but was arcing inside cap shield enough to keep it from starting!

      www.stepbystepvolvo.com/Resources/Volvo%20No-Start.pdf

      http://www.stepbystepvolvo.com/NoStart.html

      This is free and only asks for donation if solves problems








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    740 turbo won't start for anything.... 700 1987

    you only need 3 things to make a car go...fuel, spark, and compression. id check and make sure the cam belt didnt break or jump, when you cranking listen and see if it soulnd like its in time, not like its got a weak cylinder, or skipping a cylinder....the only other thing i can think of would be a bad coil, or something along those lines....just beacuse a coil sparks, doesnt mean its good....I've had a number of those throw me off, and i watched it happen to other machanics. if you can, take the coil from your 240 and pop it in....it should be the same if not very similar, and if it looks like every other coil, and had negative and positive leads, pop it in and see what happens....but if you have fuel (and the injectors are firing, spark, and it doest have a blown timing belt, and there is no alarm screwing things up. it should run. One other thing (not too likely seeing as it ran the night previous, check all the air boots, from the air mass meter at the air cleaner all the way to the throttle body, its possible something riped, or you have a major vacuum leak throwing the mixture off so it wont start.) you can take a can or carb cleaner, or starting fluid, take off a vacuum hose at the intake manifold (not the throttle body) crank it and spray at the same time, and see if it fires, if it does, you have a fuel problem, or a huve vacuum leak like a broken air hose. good luck
    Mark







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