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700/900 Series General Forum for the Volvo 740, 760, 780, 940, 960 & S/V90 cars |
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Old wenty decides not to start ..first time in 15 yearsViews : 317 Replies : 4Users Viewing This Thread : |
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Jan 19th, 2022, 09:26 | #1 |
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Last Online: Nov 18th, 2023 14:52
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Old wenty decides not to start ..first time in 15 years
dear all
She is turning over..fuel pump is working but she just wont fire up. She was the most reliable car in the world.Been all over Europe. im living in Bulgaria so the ease of a mechanic is not as in uk... could you give me some obvious starting points please...i know there are probably lots but any advice is much appreciated... thanks |
Jan 19th, 2022, 09:52 | #2 |
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Last Online: May 19th, 2024 20:22
Join Date: Jul 2009
Location: Holywood
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How do you know the fuel pump is working during cranking?
What is the rpm needle doing during a long run of the starter (say 5s)? |
Jan 19th, 2022, 23:47 | #3 |
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Last Online: May 23rd, 2024 01:16
Join Date: Dec 2015
Location: eastsussex
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HI
Hope this helps - STEP 1: Check for spark! Safest for you and your car is a timing light, but without one, unplug ignition wire going from the coil to the distributor. Ground it very close to a strut tower stud like in the picture above. Crank the engine. Do you see spark? If you see a consistent spark, go to the next step and do the starting fluid test. If no spark, inspect Crankshaft Sensor/Hall Sensor and do ignition diagnosis. -STEP 2: STARTING FLUID! This will confirm that ignition, timing and mechanicals of the engine are good with one fast and easy test: TO USE STARTING FLUID: Unplug the fuel injectors, pull the spark plugs and clean them of any fuel, crank the engine and air out the cylinders. (This will clear out any flooding of the cylinders from trying to start the engine.) Then reinstall the spark plugs, LEAVE INJECTORS UNPLUGGED, disconnect intake hose at throttle body, open throttle body, give it two long sprays, crank. Start? If so, you have a fuel system issue. YOUTUBE VIDEO ("test fire without any fuel lines even installed in the car yet.) If your car runs on starting fluid, the fuel system is suspect. Check for 12v at the fuel pumps/fuel pump fuse with the engine cranking. Check fuel pressure. A gauge that will bolt onto the fuel filter outlet (12mm banjo) is available from auto parts stores for a refundable deposit. -Nothing wrong with doing a compression test! -Check belt timing. The cam, crank, and aux shaft (on 240) all need to be aligned correctly. -Check ignition timing. Approx 12 degrees BTDC. |
Jan 19th, 2022, 23:49 | #4 |
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Jan 20th, 2022, 12:39 | #5 |
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Location: Amersfoort (NL)
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