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Hi Chris and Jim,
Unless Turbo, 1989 normally aspirated 700 is like 1989+ 240 is OBD-1 equipped. See the FAQ article on OBD, or review your Volvo 'green' manual service doc, or your Haynes manual. (Clymer published also, I guess, yet a long time ago and out of print.)
A CHECK ENGINE light on the instrument cluster?
Siemens / Bendix Regina fuel injection / Rex ignition started with some normally aspired (not Turbo) in 1990? I guess 1990. Square ignition coil is Rex. Round coil is Bosch.
To check OBD:
https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm
Ignore Motronic info - specifically in the table columns where the header row states Motronic.
Yet there is the other issue that affects all 700-900 series is the fuse and relay platform that is, as you know, hidden behind the ashtray. The fuses in front and the relay in back.
Heat related issues that afflict electrical components and connection can persist in Winter, though usually Summer will reveal these or Summer heat will also exacerbate heat related issue.
In all 700-900 Series, the fuse and relay is a serviceable item as the wire harness terminates at the under side the fuse / relay platform in terminal connectors that insert and secure to the platform. The fuse and relay terminals slide into the wire harness terminal. Corrosion forms and can cause heat. High current loads on the platform like the white fuel injection relay can actually begin to melt under and around it. Correspondingly, intermittent faults can form.
The white fuel injection relay can form internal faults at the solder welds inside. The welds may have cracks, yet make a contact, and as the relay heats up, the cranks may open, and the engine stalls. Always good to keep known good spares in the trunk and on the shelf.
Both fuel pumps run when the dash light are on yet do not start the engine?
You've checked for spark and verified fuel delivery?
If not Turbo, you do service and replace the preheater flap valve thermostat on the upstream side of the air filter in the air filter box. These always fail to HOT all the time, closing the ambient air intake, so it is max heat from the heat shield around the exhaust manifold carried by an accordion style tube to the non-Turbo 700-900 box underside ruins an AMM. Though an OBD check for fault codes at socket 2 (fuel) and 6 (ignition) may reveal a fault code or not. Bosch is forgiving up to the point engine control can't compensate or the intermittent fault may not be so intermittent, so codes or set. You may need to test engine control components and wire harness connection using a digital electric multimeter.
You do have a crank position sensor (CPS) and these also fail intermittently at first. CPS failure is a no-start condition. An indicator of CPS failure is the outer sheath peeling away after decades or, if after market, years of under-hood conditions.
Meanwhile, back at the fuse and relay platform, and peeling apart the 700 and newer series' interiors sucks, remove the ashtray and use a light to visually inspect the relay platform. See any of the housing plastic warped from heat? Give the fuses and relays a wiggle? Some Deoxit-D spray at these and other wire line connectors all along the watchtower wire harness helps.
See here:
https://www.brickboard.com/FAQ/700-900/ElectricalCircuitsRelays.htm
See the comments by John Sergeant and others on this page.
Else, begin your diagnosis for cause to seek a repair resolution.
See stalling and starting problems.
https://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm
Spook and other 700-900 series sages can provide you additional help. I've not ever owned a 700 and newer series Volvo.
Almost got a non turbo 1992 740 in white with M47 transmission. Wah. In a good shape, and now gone, a year ago or so.
Questions?
Hope that helps you.
Unemployed Yet Again MacDuffy's Buttermilk & Ultra Sour Dough Bread Tavern.
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