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I'll guess Owen F. is from UK asking whether carbs or injected. Master Brewer, Owen F?!?!?!?!?
As Mr. Art Benstein promotes, and I do not mean to plagiarize, yet am plagiarizing, resolving fuel delivery, checking pump on pressure at the Schrader valve, and how long does the the fuel pressure enduring after the pumps / engine is off.
If your 1992 240 engine ran better before the cylinder head rebuild, suspect an issue with the repair. Check engine compression. Cold okay wth all plugs out, ignition wire disconnected, and fuel injection fuel pump relay disconnected, or fuse pulled. Even compression in all cylinder is key with more more than 5-10% variance.
A check of the wire engine bay harness connectors. Disconnect, inspect, clean as you need (coolant corrodes). How is charging? 14.5 volts at cold, maybe 13.8 or so when warmed. Check air induction bots from the air filter box up to the throttle body. Though unlikely as a result of your cylinder head repair.
Spin the fuses in the fuse panel?
If your new timing belt was off a tooth on any timing belt cog, poor running and worse performance would persist through the warm-up. Yet I'm not entirely certain. One tooth off any of the t-belt pulley gears is rather significant.
When you turn the key to instrument cluster warning lights on, does the "CHECK ENGINE" light also illuminate. Does the "CHECK ENGINE" go dark or remain illuminated after start?
As 42 indicates, +1 on checking the OBD-1 diagnostic trouble codes.
Your North America US market 1992 Volvo 240 is equipped with Bosch LH-Jetronic 2.4 / 3.1 and Bosch EZK116 ignition.
The Volvo 700-900 FAQ includes a an article page to check the engine control for fault codes in both injection and ignition. Copy and paste URL into new browser tab or Window. You can click FAQ at the top of each brickboard page, yet you navigate away from the page you click FAQ on. So, use Shift+click for new browser window or Ctrl+click to open page in a new background browser tab.
https://www.brickboard.com/FAQ/700-900/EngineOBDCodes.htm
This article on engine performance causes may also help you:
https://www.brickboard.com/FAQ/700-900/EnginePerformanceSymptoms.htm
Perform "Fuel Injection and Ignition Diagnostic Procedures in Bosch LH-Jetronic 2.4+, Regina, and EZK 116/REX 1"
If the red light flashes out anything other than the 1-1-1 all's OK, write the code down and repeat until no new codes DTC fault display. Perform the same in the other OBD socket. Post the codes back here in a reply to your original post.
Unrelated: Do you know of the cold / preheated air flap valve in the air filter box? An air temp thermostat (Aftermarket Wahler PN 70411) in the air filter box upstream of the air filter. In Virgina, you are not required to test emissions. You will either want to replace the thermostat (Wahler every two years or so) or remove the preheater assembly and remove the silver air accordion style metal hose. If in a cold months very cold environ, maintain this system so engine warm-up is proper. A few YouTube videos about it. Same thing happens in non-Turbo 700-900.
Hope that helps from this armchair.
Instant coffee and eggnog boyyyyyyyyyyyyy.
Happy Eggnog Holidayze!!!!
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7 240s total since 1984. 3 240s today and rotting away.
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