Hello,

My 83 volvo 240 is at a friend's shop now after it turns over, but refuses to start. I've just replaced the wiring harness, checked for fuel and spark (ok), checked the fuse box, timing is ok, and am running out of ideas for the car.

My friend thinks we should change the ecu, b/c after the harness was removed the car backfires a little bit vs before it didn't. On ebay, there's two types: 0280000503 or 0280000510. The engine is the original b23f, lh2.0 system. Which one should I get? Thanks for the help.

Solomon

 

What number does your ecu have now?

Buy one that matches yours....

 

Not sure about the 1983 240, but on my 1987 740, I can get fuel from the fuel rail and it will not start. That's because in-tank pump still sends out fuel. See www.stepbystepvolvo.com, "Real-Life Volvo Quiz."

 

LH2.0, with the air mass meter ending with -002, years 83-84, uses ECU -503.
The -510 is LH2.1 with air mass meter -016.

Try to start the car with the air mass meter unplugged, in "limp-home" mode.

 

It's rare for the ECU to go bad. More likely the AMM.