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lh2.4 warm start issue (fine cold or hot) 200

posted by  RedBrickDad on  Tue Mar 26 11:58 CST 2024
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volvo 240 lh2.4 all stock except does not have a 25amp fuse, PO has installed blade fuse box.

will start and run w/out any issues when cold.
after driving it for 30 minutes or so and then letting it sit for another 15-30 minutes it will start but then stalls out with rough idle unless given a little gas.
Give it a little gas and its fine.

if i stop for like 5 minutes or so it starts fine w/out giving it gas.
if it sits longer for like a few hours it cranks fine.

Verified TB is clean
both fuel pumps work and sound fine using the tube to ear test
fuel relay is new/replaced with a few of them i have around
flametrap all new
battery and grounds appear good


What do I check?
I was thinking of cleaning IAC
maybe check injectors somehow?
unplug cold start injector?
swap MAF from one of my other lh2.4?

Any other ideas?





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