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Volvo 240 turbo wagon, will crank but not start occasionally, when its cool out mainly. I have unplugged all the relays under the hood and checked all the fuses for the fuel pumps all check OK. After it sits for awhile it will start and run just fine no rough running or anything.
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Check under the PS seat, there is a computer (abs controller?) under there (10mm) on that computer should be the overload protection relay / 15 amp? ...
Ignition module doesn't go bad often. If you are not getting spark I would check crank sensor first, they do fail often. If you have spark check fuel pump relay. That's another item that fails frequently.
You can check 2 things. 1., have someone in the car to turn the key to the start position. Tap the starter with a small hammer and see if it cranks. If it does, replace the starter. 2., have the battery tested as well as the connections to the battery. Corrosion builds and can cause heavy resistance to heavy loads(like starting). These are the 2 most likely causes. Let me know if you need further assistance.
new fuel filter when replaced the pump? might have a bare wire somewhere causing the fuse to blow usually the relay is under hood with main fusses and secondary being under dash or in glove box.
Check if you still getting fuel and sparks, two items need to keep the car running. Check fuses and fuel pump relay, if needing new relays go to the junk yard and get couple of them for nothing. Checking making sure you getting fuel and fuel pump working properly, unplug the the main coil wire to distributor so the car wont start we just want the engine just to turn over. under the hood, locate fuel filter, disconnect the line to or from it, wrap the bottom of the hose with old clothe firmly and to remember to point the house downward away from your face so it wont splash at you. and have a friend turn ignition over just like starting, see if the fuel come out with good pressure. if fuses and relay check out, your crank sensor may be bad, being 91' strong possibility. crank sensor send info to computer telling to send fuel to your injectors. For sparks, make sure you plug the main wire to distributor back. pull one plug wire and get spare plug, plug it and ground the plug and have a friend turn the engine over and see if you getting sparks, do not touch the plug, big shock. No sparks, check the coil if you getting 12v, if yes, than your cam sensor is faulty. The cam sensor work just like the crank sensor but telling the computer to send sparks to the distributor. Common for older European cars, crank and cam sensor tend to become faulty after years of service due to age and heat abuse.
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