I have a 1984 Volvo 240 Series GL. It has an automatic/overdrive, EFI (LH-Jetronic injector system) with the 2.3L B23F motor.
The other day I was going to go to the store, started the car and let it warm up close to normal operating temperature before driving. I drove about 2 block when it shut down for seemingly no reason. For the next 5 minutes I tried to restart it. At first it would fire, run for a moment and then die, like it was starving for gas. It would fire and I would pump the gas like crazy, but it wouldn?t have any effect, it still died after a few moments, and I noticed it wouldn?t rev up above about
1200-1300 rpm. The last time it ?ran? I fired it up and it briefly ran at about 200-300 rpm before it died. Again, pumping the gas had no effect at all. It ran as if it was running on fumes.The following day I put 5 gallons of gas in it, tried to start it but it only turned over, didn?t fire at all. I realized that I didn?t hear the fuel pumps working when I tried to start it and suspected fuel pump failure. After testing out the fuel system, per my Haynes manual, I eventually put a jumper where the relay goes and found that the pumps didn?t fail, that they were working fine and had fuel through-out the fuel system, as it should be.
With the fuel system working (when I jump the relay) I discover, after pulling a spark plug to check for spark, that I have no spark. Next, I test the coil and the readings are below the low end of the tolerance levels. After having a mechanic confirm my coil is bad, I installed a new one but I still don't have spark.
This is what I know and what I have done: · bought new and replaced relays and ignition coil · removed a spark plug, grounded it, cranked the motor, no spark · unplugged coil/cap wire from distributor, grounded it, cranked the motor, no spark · with key on, coil has 12v on both sides of the primary terminals (if this is normal why does the coil have -1 and +15 markings on it) · cap and rotor slightly worn, but not bad, with no moisture inside the cap · tested ignition control unit for voltage on the blue wire (#2 connector) and it had 12v, then I tested the black wire/ground circuit (#10 connector) and had 0.4 ohms resistance, within the 0.5 ohms or less tolerance. · per manual, pick-up coil ok I?m lost after this. I still can?t get a spark. Is there something I missed that I need to check or something I should try? What is my next step? This is my first time working with an electronic fuel injection system, so I?m kind of stumbling through and could really use some help, suggestions, do?s, don?ts or anything you may consider useful.